A review of weevils of the genus Ceutorhynchus (Coleoptera: Curculionidae), associated with woodland draba, Draba nemorosa (Brassicaceae)

2020·3.7 MB·

by  B. A. Korotyaev

ZOOSYSTEMATICA ROSSICA
I S S N Zoological Institute, Russian Academy of Sciences, St Petersburg ▪ https://www.zin.ru/journals/zsr/
2410-0226
[online] Vol. 29(2): 353–367 ▪ Published online 25 December 2020 ▪ DOI 10.31610/zsr/2020.29.2.353
0320-9180
[print]
RESEARCH ARTICLE
A review of weevils of the genus Ceutorhynchus (Coleoptera:
Curculionidae), associated with woodland draba, Draba nemorosa
(Brassicaceae)
Обзор жуков-долгоносиков рода Ceutorhynchus (Coleoptera:
Curculionidae), связанных с крупкой дубравной Draba nemorosa
(Brassicaceae)
B.A. Korotyaev
Б.А. Коротяев
Boris A. Korotyaev, Zoological Institute, Russian Academy of Sciences, 1 Universitetskaya Emb., St Petersburg 199034,
Russia. E-mail: [email protected]
Abstract. A brief review of, and a key to eight Palaearctic species of the weevil genus Ceutorhynchus
Germar, 1823 associated with the spring and summer ephemeral crucifer Draba nemorosa (Brassicaceae)
are given. Two new species related to Ceutorhynchus unguicularis C.G. Thomson, 1871 are described: C.
kerzhneri sp. nov. from Primorskiy Territory and Kunashir I., and C. melniki sp. nov. from Zabaikalskiy
and Primorskiy territories and eastern Mongolia.
Резюме. Даны краткий обзор и определительная таблица восьми видов долгоносиков рода Ceu-
torhynchus Germar, связанных с весенне-летним эфемером крупкой дубравной Draba nemorosa
(Brassicaceae). Описаны два новых вида, близких к Ceutorhynchus unguicularis C.G. Thomson, 1871:
C. kerzhneri sp. nov. из Приморского края и с о. Кунашир, и C. melniki sp. nov. из Забайкальского
и Приморского краев и восточной Монголии.
Key words: key to species, Russia, Transcaucasia, Siberia, Far East, Mongolia, Coleoptera, Curculion­
idae, Conoderinae, Ceutorhynchini, Ceutorhynchus, Draba nemorosa, new species
Ключевые слова: определительная таблица, Россия, Закавказье, Сибирь, Дальний Восток,
Монголия, Coleoptera, Curculionidae, Conoderinae, Ceutorhynchini, Ceutorhynchus, Draba nemorosa,
новые виды
ZooBank Arcicle LSID: urn:lsid:zoobank.org:pub:10BA4B22­F464­401E­BE99­619D53370A0C
Introduction family Conoderinae and especially so in its largest
genus Ceutorhynchus Germar, 1823, with over
One of the characteristic features of weevils,
300 species associated almost exclusively with the
especially of the species with larvae developing in
plant family Brassicaceae (= Crucife rae) (Colon­
the plant tissues, is their pronounced preference for
nelli, 2004), a group of plants rarely attacked by
ruderal and coenophobic [term by Razumovskii
poly phagous herbivores because of their richness
(1981)] plants and pioneers of newly formed habi­
in toxic secondary compounds. In the course of the
tats (Korotyaev, 1992, 2006). This feature is obvi­
study of relict westernmost communities of Ulmus
ous in the supertribe Ceutorhynchitae of the sub­
japonica in southwestern Transbaikalia in 2018
© 2020 Zoological Institute RAS and the Author(s)
B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba
and 2019, only two specialised weevils were found angle about 45°). Body small, 1.6–1.9 mm (Figs
on this important coenose­forming tree in the 1, 2). Ros t rum, antennae, and at least tibiae and
flood­land forests, while on a delicate spring and tarsi reddish brown, pronotum and elytra black,
summer ephemeral crucifer, the woodland draba, often with brownish tint. Dorsal vestiture moder­
ately dense, uniform, subrecumbent to semi­erect,
Draba nemorosa, four Ceutorhynchus species were
for med by narrow parallel­sided whitish scales.
found (Korotyaev et al., 2020). A brief essay on
Elytral striae bare, intervals not wider than striae,
these and three additional species associated with
flat or weakly convex. Hind wings non­functional,
D. nemorosa in the West Sayan Mts and in Trans­
strongly redu ced. Aedeagus angularly narrowed
caucasia was published (Korotyaev, 2019) but the
apically (Figs 11, 12).
identity of one of the species, C. sp. [? C. unguicu-
2 (3). Elytra narrow, 1.23–1.27 times as long as wide,
laris C.G. Thomson, 1871], remains obscure. The slightly rounded at sides, flattened dorsally (Fig. 1).
COVID­19 pandemic of 2020 has deterred inves­ Elytral vestiture subrecumbent. Aedeagus as in
tigation of the woodland draba consortia, and only Figs 11, 19. Eastern Transcaucasia, Northeastern
a single specimen of the problematic form collected Turkey .......................... C. gemuricus
in Yakutia long ago is to be added to the known 3 (2). Elytra wider, oval, 1.08–1.15 times as long as
distribution of the species of Ceutor hynchus (Ko­ wide, noticeably rounded laterally and convex dor­
sally (Figs 2). Elytral vestiture semi­erect. Aedea­
rotyaev, 2019). To facilitate further investigation
gus as in Fig. 12, 20. Mountain Caucasus, middle
of the woodland draba consortia, a key to its eight
Volga area, Kazakhstan, East Siberia: West Sayan
known Ceutorhynchus species is given in this pa­
Mts, Buryatia ...................... C. kipchak
per and descriptions of two very similar and, ap­
4 (1). Antennal funicle seven­segmented. Claws sim­
parently, closely related species from the south of
ple or toothed, free or closely approximate at base,
Transbaikalia and the Russian Far East, and also
thin or rather stout, weakly to moderately diver­
from eastern Mongolia, are published. Host plants gent. Body on overage larger, 1.5–2.5 mm. Body
of these new species are not known, but may well predominantly black, only tibiae may be varying­
be in the genus Draba, so targeted collecting on ly dark brown; if legs, apical margin of pronotum
Draba nemorosa and D. sibirica in those areas is and apex of elytra reddish brown, then body robust,
most desirable. A key to the three species of the C. claws finely dentate, elytra with white scutellar spot
unguicularis species group from Siberia and char­ and mottled vestiture of narrow white and brown­
ish scales, and middle tibia of female finely mucro­
acteristics of this group are also given.
nate, anal ventrite deeply depressed medio­apically.
Dorsal vestiture sparse to moderately dense, re­
Material and methods
cumbent to semi­erect, uniform and formed by
narrow parallel­sided or acuminate white scales,
The length of body was measured from anteri­
or predominantly by semi­erect dark setae with an
or margins of eyes to the apex of the elytra.
admixture of white setiform scales. Elytral striae
All material cited in the text is in the Zoologi­
bare or with white narrow scales, intervals usually
cal Institute, Russian Academy of Sciences, St Pe­ wider than striae, flat or barely convex. Hind wings
tersburg (ZIN). not conspicuously reduced. Aedeagus of varying
structure.
Taxonomic part 5 (8). Larger, 1.8–2.5 mm. Dorsal vestiture quite
conspicuous, formed by recumbent uniform grey­
Order Coleoptera ish narrow truncate scales (then claws distinctly
dentate, apical margin of 4th abdominal ventrite
Family Curculionidae
entire, and male fore tibia finely mucronate) or by
Subfamily Conoderinae semi­erect dark setae with an admixture of white
setiform scales (then claws simple, apical margin of
Genus Ceutorhynchus Germar, 1823 4th abdominal ventrite shallowly excised medially
and slightly raised). Elytral striae with conspicu­
A key to Ceutorhynchus species associated
ous narrow white scales. Aedeagus angularly nar­
with Draba nemorosa
rowing apically, with sides moderately sclerotised.
1 (4). Antennal funicle six­segmented. Claws sim­ 6 (7). Dorsal vestiture rather dense, formed by re­
ple, free, fine, short, moderately divergent (at an cumbent uniform greyish narrow truncate scales;
354 ( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367
B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba
Figs 1–4. Ceutorhynchus, dorsal habitus. 1, C. gemuricus, Azerbaijan, Autonomous Republic of Nakhchivan; 2, C.
kipchak, Buryatia, Nikol’sk Vill.; 3, C. seniculus, Zabaikalskiy Terr., Zhindo Vill.; 4, C. klementzorum, Zabaikalskiy
Terr., Zhindo Vill. Photo by K.V. Makarov.
no trace of white stripes on pronotum or white scales; pronotum with narrow median and lateral
scutellar spot present (Fig. 3); sides of mesothorax white stripes; elytra with ill­defined but conspicu­
without condensed white scales on apices of mes­ ous white scutellar spot (Fig. 4); sides of mesotho­
epimera. Claws distinctly dentate, apical margin of rax with white scales conspicuously condensed on
4th abdominal ventrite entire, male fore tibia finely apices of mesepimera. Claws simple; apical mar­
mucronate; aedeagus sharpened apically (Fig. 13). gin of male 4th abdominal ventrite shallowly ex­
East Siberia, Northeastern Russia (Magadan Prov., cised medially and slightly raised; male fore tibia
Chukchi Autonomous Area), Mon golia, Northern non­mucronate; aedeagus narrowly rounded (Fig.
China ............................ C. seniculus 14) or shallowly excised apically. Southern East Si­
7 (6). Dorsal vestiture formed by subrecumbent to semi­ beria northward to Yakutia, eastern half of north­
erect dark and white very narrow parallel­sided ern Mongolia ................ C. klementzorum
( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367 355
B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba
Figs 5–8. Ceutorhynchus, dorsal habitus. 5, C. sp. [? C. unguicularis], Tuva; 6, C. querceti, Buryatia, Ina Vill.;
7, C. dauricus, Zabaikalskiy Terr., Zhindo Vill. (pygidium detached below); 8, C. cochleariae, Irkutsk. Photo by
K.V. Makarov (5, 7, 8); photo by G.E. Davidian (6).
8 (5). Smaller, 1.5–2.4 mm. Dorsal vestiture fine, armed with clearly visible appendage in basal half.
sparse and inconspicuous, elytral striae bare, or 9 (10). Claws very closely approximate and armed with
elytra with ill­defined white scutellar spot and a well­developed tooth in basal half. Rostrum slen­
mottled vestiture of narrow white and brownish der. Body and legs black, legs may be dark brown.
scales on intervals and striae with conspicuous Sides of thorax densely clothed with broad­lanceo­
lanceolate white scales; 4th abdominal ventrite in late scales separated by less than own width (Fig.
male with apical margin not excised medially. Male 5). Middle tibia of female non­mucronate. Elytral
fore tibia without mucro; female middle tibia finely striae bare, intervals with sparse narrow, paral­
mucronate, or claws very closely approximate and lel­sided white scales. Aedeagus (Figs 15, 21) with
356 ( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367
B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba
narrowly rounded, weakly attenuate apex. South­ Ceutorhynchus gemuricus Korotyaev, 1997
ern slope of West Sayan, East Tuva Plateau, Cen­ (Figs 1, 11, 19)
tral Yakutia (new record) ......................
...................... C. sp. [? C. unguicularis] Distribution. Armenia, Azerbaijan, Northeast­
10 (9). Claws weakly diverging, simple or with broad ern Turkey (Korotyaev, 1997; Colonnelli, 2004).
tooth at base [then middle tibia of female finely Hosts. Draba nemorosa in the Nakhchivan
mucronate, scales on elytral intervals very narrow, Autonomous Republic of Azerbaijan (Koroty­
pointed apically, legs and partly elytra may be red­
aev, 1997); in Northeastern Turkey I swept a few
dish brown (in C. querceti)]. Rostrum wider. Mid­
speci mens in the habitats where no D. nemorosa
dle tibia of female finely mucronate. Aedeagus with
was noticed.
subtruncate or shallowly emarginate apex (Figs 18,
22, 23).
11 (12). Apical margin of pronotum, legs and at least Ceutorhynchus kipchak Korotyaev, 1996
apical part of elytra reddish brown. Elytra with (Figs 2, 12, 20)
white scutellar spot and mottled vestiture of nar­
Distribution. Armenia, eastern European Rus­
row white and brownish scales, elytral striae scaled
similarly to the intervals (Fig. 6). Claws dentate at sia, southern slope of the West Sayan Mts in the
base. Anal ventrite of male very deeply depressed south of Krasnoyarsk Terr. and in Tuva, East Tuva
medio­posteriorly, apical margin behind the de­ Plateau, Buryatia, Kazakhstan: Caspian Lowland
pression glabrous. Aedeagus as in Fig. 22. Holarctic (Khruleva et al., 2011, 2012), East Kazakhstan
species, mainly on Rorippa palustris, but found in Prov. (Korotyaev, 2019).
southern Tuva on Draba nemorosa or D. sibirica . .
Hosts. Draba nemorosa; in Tuva also on D. sibir-
.................................. C. querceti
ica (Korotyaev, 2019).
12 (11). Body and legs black, legs occasionally brown­
ish. Elytral vestiture uniform, composed of pointed
Ceutorhynchus seniculus Brisout de Barneville,
or parallel­sided very narrow white scales.
13 (14). Claws with short broad tooth at base. Ti­ 1883
biae not paler than femora. Elytral intervals with (Figs 3, 13)
sparse hair­like pointed scales, striae with similar
Distribution. South of East Siberia, North­
but shorter scales. White scales on sides of prono­
tum, meso­ and metathorax sparse, separated by eastern Yakutia, Magadan Prov. (Korotyaev,
not less than own widths; sides of pronotum with­ 1980; as C. changaicus Schultze, 1898), Chukchi
out conspicuous white stripes. Elytra wider at base Autonomous Area (Berman et al., 2002), Mongo­
and more strongly narrowing toward apex (Fig. 7). lia [Schultze, 1898 (as C. changaicus); Voss (1967;
Aedeagus as in Fig. 18. Body length 1.7–2.1 mm. as C. gobiensis), Korotyaev (1980; as C. changai-
Southern East Siberia east of Lake Baikal, eastern
cus)], Northern China (Alonso­Zarazaga et al.,
Mongolia, Korean Peninsula. On Draba nemorosa,
2017).
probably also on Cardamine spp. .... C. dauricus
Hosts. Several species of Brassicaceae [often
14 (13). Claws simple. Tibiae often brown. Elytral in­
Erysimum flavum and E. cheiranthoides, occa­
tervals with sparse parallel­sided, truncate apical­
ly white scales; striae bare or with inconspicuous sionally Smelowskia alba] in Tuva; Alyssum sp.
fine hairs. Sides of pronotum without conspicu­ in Chukotka (Berman et al., 2002). During two
ous white stripes, meso­ and metathorax densely short expeditions in Bu ryatia this species was
clothed with broad white scales separated by less never found on Erysimum sp. in the Selenga flood
than own widths. Elytra with humeri less convex, plain or on Smelowskia alba and Alyssum len-
widest usually slightly behind them, less rounded at
ense in Barguzin Valley and was common only
sides and less strongly narrowing toward apex (Fig.
on Draba nemorosa in two flood­plain ruderal
8). Aedeagus as in Fig. 23. Body length 1.6–2.4
localities at the southern boundary of the taiga
mm. Euro­Siberian species, distributed from West
zone on the Khilok River in the absence of other
Europe to Irkutsk in the east. Mostly on Cardamine
crucifers around and in the forest­steppe zone at
spp., but found on Draba nemorosa in Irkutsk and
on Barbarea arquata south­east of Irkutsk ....... the Chikoy River, also with a poor flora of Bras­
................................C. cochleariae sicaceae (Korotyaev, 2019).
( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367 357
B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba
Ceutorhynchus klementzorum Korotyaev, 1980 different fruit structure. I also failed to find C. un-
(Figs 4, 14) guicularis in Apsheronsk Distr. of Krasnodar Terr.
at an elevation of about 1200 m a.s.l. and collected
Distribution. Irkutsk Prov., Buryatia,
this species on Turritis borealis only in the pied­
Zabaikalskiy Terr., Mongolia (Korotyaev, 1980,
mont forest near Kaluzhskaya Vill. in Krasnodar
2019).
Terr. and at an elevation of about 700 m S of No­
Hosts. Draba nemorosa in ruderal flood­plain
voprokhladnoye Vill. in the Republic of Adygea.
localities at the Khilok and Chikoy rivers together
In Europe (Dieckmann, 1972; Alonso­Zarazaga
with C. seniculus (Korotyaev, 2019).
et al., 2017) C. unguicularis is distributed from
Ireland, Sweden and Finland in the north to Italy
Ceutorhynchus sp. [? C. unguicularis C. G. and Greece in the south and is associated mostly
Thomson, 1871] with T. borealis (Dieckmann, 1972; as Arabis hir-
(Figs 5, 9, 15, 21)
suta). At the eastern boundary of Europe in the
east of the Russian Plain this species lives mostly
Material. Russia, Central Yakutia, Lena­Vilyui in­
on Schivereckia hyperborea of the tribe Alysseae
terfluve, km 29 of Vilyui Hwy near Yakutsk, “Suntar”
Alas, motley­grass meadow, 28.V.2013, S.N. Nogovi­ (Isaev, 2007; Dedyukhin, 2016), and less often,
tsyna leg., 1 male. on T. borealis (Dedyukhin, 2016). The long series
Distribution. Southern East Siberia: southern from Bashkortostan taken by S.V. Dedyu khin
Krasnoyarsk Terr., Yermakovskii Distr.; Tuva: from Sch. hyperborea, has no broad­lanceolate
southern slope of the West Sayan Mts and East white scales on the elytral disc except along suture
Tuva Plateau (Korotyaev, 1992, 2019), Central and behind scutellum.
Yakutia (new record); Eastern Kazakhstan (Ko­
rotyaev, 2019). Ceutorhynchus querceti (Gyllenhal, 1813)
Hosts. Draba nemorosa and D. sibirica in
(Figs 6, 22)
southern Krasnoyarsk Terr. and in Tuva (Ko­
rotyaev, 2019); both plants occur also in Central
Distribution. Holarctic species with the Arctic,
Yakutia (Zakharova et al., 2005) where the small
boreal and northern subboreal distribution (Col­
(1.5 mm long) male was collected in the period of
onnelli, 2004).
their flowering.
Hosts. Mostly on Rorippa palustris throughout
Note. The Siberian form is slightly but usually
most of its Holarctic range (Dieckmann, 1972),
noticeably different from the European specimens
also in several localities in Tuva [West Sayan Mts:
of C. unguicularis in the slightly shorter antennal
80 km N of Teli Vill.; southern foothills of West
club, shorter rostrum, shorter, more robust and
Sayan, town of Turan; Central Tuvinian depres­
more strongly rounded at sides elytra with more
sion – Chadan River flood plain, Lake Chagytai,
angular preapical prominences (Korotyaev, 1980:
Seserlig (25 km NW of Kyzyl), Kok­Tey east of
160 – “a female from Tuva of an uncertain identi­
Kyzyl; Shurmakskii Pass on Eastern Tannu­Ola
ty”). Specimens of C. unguicularis from Krasno­
Mt. Range; Sagly and Erzin villages in southern
dar Terr. and Adygea have broad­lanceolate white
Tuva; Yrban Vill. on East Tuva Plateau; my collec­
scales sparsely scattered over the elytral disc,
tions of 1979 and 1980], but beetles were found in
which is never found in the specimens from Siberia
southern Tuva in numbers on Draba nemorosa or
and Kazakhstan. This form differs more strongly
D. sibirica and did not occur on R. palustris closer
in the bionomics; I did not find it on Turritis bo-
to the creek (Korotyaev, 1992), maybe to escape
realis in southern Krasnoyarsk Terr. in June 1979
flooding.
when I went there to collect additional material
to the single female brought shortly before that by
Ceutorhynchus dauricus Korotyaev, 1997
E. Zemlyakova of the Moscow State University
(Figs 7, 18)
but collected in numbers on Draba nemorosa and
D. sibirica belonging to a different tribe (Alys­ Distribution. Zabaikalskiy Terr., Amurskaya
seae) and dissimilar morphologically, with sharply Prov., Primorskiy Terr., Mongolia, North Korea
358 ( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367
B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba
Figs 9, 10. Ceutorhynchus, head and rostrum, dorsal view. 9, C. sp. [? C. unguicularis], Tuva; 10, C. cochleariae,
Irkutsk. Photo by K.V. Makarov.
(Korotyaev, 1997), and South Korea (Hong et al., Georgia (Korotyaev & Cholokava, 1989; see taxo­
2001; Korotyaev & Hong, 2004). nomic notes below).
Hosts. On the right bank of the Chikoy River Hosts. Usually Cardamine pratensis (Dieck­
near Zhindo Vill. in Zabaikalskiy Terr. two speci­ mann, 1972: 70), but species of several other gen­
mens were swept in herbage with Draba nemorosa era of Brassicaceae were also listed in the cited
in early June 2019 (Korotyaev, 2019). In South publication by Dieckman of which E. Colonnelli
Korea, Draba nemorosa var. hebecarpa was re­ mentions only Dentaria enneaphyllos and Lunar ia
corded as a host (Hong et al., 2001). rediviva (Colonnelli, 2004). In Tuva the species
was found only on Cardamine pratensis out of the
Ceutorhynchus cochleariae (Gyllenhal, 1813) 28 investigated in 1979 and 1980 species of cru­
(Figs 8, 10, 23) cifers (Korotyaev, 2019). In Irkutsk and its vicin­
ities (Korotyaev, 2019), I have collected beetles
Distribution. Sub­boreal Western Palaearctic from Draba nemorosa and Barbarea arquata far
species distributed from West Europe to Irkutsk from water bodies in the habitats where no Car-
Prov. (Korotyaev, 1980) and northern Tuva (Ko­ damine sp. was present.
rotyaev, 2019). Dieckmann (1972) and Colonnelli Taxonomic notes. The taxonomy of C. cochle-
(2004) report it from Anatolia (Asian part of Tur­ ariae in the Caucasus needs investigation. This
key) but I have not seen material from Turkey. The species is apparently absent from the largest part
record from Georgia in Colonnelli (2004) is based of the steppe zone of European Russia (Arzanov,
apparently on the only known specimen from the 2015), but a slightly different form with paler (red­
City of Poti on the Black Sea coast in Western dish) legs and denser and finer dorsal vestiture is
( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367 359
B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba
similar to C. cochleariae but with darker legs with
black femora and tibiae and rather bright reddish
tarsi; it also has sparser dorsal vestiture, and the
beetles look darker than northern C. cochleariae.
So, three allopatric forms exist along the north­
south transect from the forest zone of Euro pean
Russia through the Caucasus foothills to the
middle forest belt with Picea orientalis and Abies
nordmanniana.
Ceutorhynchus unguicularis species group
Diagnosis. Body small, 1.5–2.3 mm long, ro­
bust. Dorsal vestiture sparse, rather uniform.
Disc of pronotum with sparse very narrow,
parallel­sided, truncate apically white or greyish
scales, with short broad­lanceolate white scales
along base, usually also with sparse scales along
median line and along sides; intervals of elytra
with sparse similar scales; in addition, with wider
white scales along suture and at bases of 1st and
2nd intervals. Elytral striae bare. Underside with
moderately dense white lanceolate scales. Anten­
nal funicle seven­segmented, fine; club weakly to
strongly elongate, two to four times as long as
Figs 11–18. Ceutorhynchus, aedeagus, dorsal view. wide, terete, matte, with very dense short, fine pu­
11, C. gemuricus, Azerbaijan, Nakhchivan Autono­ bescence. Rostrum moderately long, slender, level­
mous Re public; 12, C. kipchak, Buryatia, Nikol’sk Vill.; ling with frons at base, about as wide as fore tibia
13, C. seniculus, Zabaikalskiy Terr., Zhindo Vill.; 14,
in middle part, cylindrical, moderately strongly,
C. klementzorum, Zabaikalskii Terr., Zhindo Vill.; 15,
evenly curved dorsoventrally, rather finely, mod­
C. sp. [? C. unguicularis], Tuva; 16, C. melniki sp. nov.,
erately densely punctate in basal half, sparsely and
holotype; 17, C. kerzhneri sp. nov., paratype, Na­
very finely punctate and moderately to strongly
khodka; 18, C. dauricus, Zabaikalskiy Terr., Zhindo
shining in apical one­third to one­half, with rath­
Vill. After Korotyaev, 1997, modified (11, 12, 18); after
Korotyaev, 1980, modified (13). er ill­defined low, obtuse median carina in basal
part. Antennae inserted near rostrum mid­length.
Pronotum weakly to moderately transverse, with
common in April and early May on Cardamine spp. weak but noticeable lateral tubercles, moderate­
in the Kuban River flood plain in the Republic of ly convex, rather shining, with medium­sized,
Adygea south of Krasnodar City. The single speci­ moderately dense punctures. Elytra with weakly
men reported by Korotyaev & Cholokava (1989) to moderately prominent humeri and weakly to
from Poti is apparently conspecific with this form. moderately rounded sides and moderately convex
In the piedmont and low­hill Northwestern Cau­ disc; preapical prominences weakly to moderately
casus this form has not been collected for many pronounced, with fine granules not conspicuously
years, and only C. filirostris (Reitter, 1888) occurs condensed and forming no oblique ridges. Elytral
(usually in small numbers) on Cardamine spp. and striae rather wide and deep, intervals moderately
Dentaria spp., but more often on Alliaria petiola- shining, as wide as, or not much wider than striae,
ta. At higher elevations, usually at about 1300 m flat or slightly convex, shining, with rather sparse
a.s.l. and above, C. filirostris is replaced (on Car- punctures and minute granules. Legs moderate­
damine lazica in Karachai­Cherkess Republic: ly long, femora mutic, tarsi moderately long and
Korotyaev & Cholokava, 1989) by a form very wide, claws short, weakly diverging, with well vis­
360 ( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367
B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba
not more than triple as long as wide
(Figs 9, 27). Elytra often less strongly
rounded and with more convex humeri
(Fig. 5). Aedeagus wider, less rounded
and wider apically (Figs 15, 21). Body
length 1.5–2.3 mm. South of East Si­
beria, Central Yakutia ..............
.......... C. sp. [? C. unguicularis]
3 (2). Antennal club strongly elongate,
3.5–4.2 times as long as wide (Fig.
26). Elytra more strongly rounded,
with less produced humeri (Fig. 24).
Aedeagus narrower, more strongly
rounded and narrower apically (Fig.
17). Body length 1.7–2.2 mm. South of
Figs 19–23. Ceutorhynchus, aedeagus, dorsal view. 19, C. gemuri- the Russian Far East ................
cus, Azerbaijan, Nakhchivan Autonomous Republic; 20, C. kipchak, .............. C. kerzhneri sp. nov.
Buryatia, Nikol’sk Vill.; 21, C. sp. [? C. unguicularis], Tuva; 22, 4 (1). Disc of pronotum and elytra with
C. querceti; 23, C. cochleariae, Irkutsk. Photo by K.V. Makarov. greyish parallel­sided scales clearly con­
trasting with broad­lanceolate white
scales. Elytra wider, with more promi­
ible appendage at base. Fore tibia of male not mu­ nent humeri (Fig. 25). Antennal club moderately
cronate, middle and hind tibiae finely mucronate. long, 2.4–2.8 times as long as wide (Fig. 28). Aedea­
Middle tibia of female not mucronate. Aedeagus gus longer and narrower, evenly rounded apically
(Figs 16, 25). Body length 2.2–2.3 mm. South of East
weakly sclerotised, with obtuse­angular apex, oc­
Siberia and the Russian Far East (only Primorskiy
casionally slightly attenuate at tip.
Terr.), eastern Mongolia ...... C. melniki sp. nov.
Species included. The group includes C. mohri
Dieckmann, 1960 from Spain, C. nigritulus
Ceutorhynchus kerzhneri sp. nov.
Schultze, 1897 from Central and Southern Eu­
(Figs 17, 24, 26)
rope (Alonso­Zarazaga et al., 2017), C. unguicula-
ris from Europe and Anatolia, with obscure form Ceutorhynchus unguicularis: Korotyaev, 1980: 160,
from southern East Siberia and Central Yakutia, pro parte (specimens from Primorskiy Terr.), nec
and two new species from the Eastern Palaearctic C.G. Thompson, 1871 (misidentification).
described below. Holotype, female: Russia, Primorskiy Terr., 20 km
Comparison. Species of the C. unguicularis W of Spassk­Dal’niy, Lake Khanka shore, meadows
group differ from species of the C. cochleariae with Salix stand, 12.VI.1989, S.A. Belokobylskij leg.
group (Korotyaev, 1980) with black elytra and Paratypes. Russia: Primorskiy Terr., Nakhodka
legs first of all in the secondary sexual characters, City, waste land, 21.VIII.1959, I.M. Kerzhner leg.,
1 male; Sakhalin Prov., Kunashir I., Sernovodsk Vill.,
namely the non­mucronate middle tibia of female
16.VII.1973, I.M. Kerzhner leg., 1 female.
and apically sclerotised and convexly rounded
Description. The new species is very similar
aede agus, which is always emarginate and poorly
to C. unguicularis and noticeably differs only in
sclerotised medially in C. cochleariae, C. dauricus
the much longer antennal club (Fig. 26) and much
and C. ussuricus Korotyaev, 1997.
narrower and more strongly rounded at sides
aedeagus (Fig. 17).
A key to species of the Ceutorhynchus ungui­
Rostrum of male 1.71 times as long as prono­
cul aris group from Siberia and the Far East
tum, that of female, 1.77–1.80 times.
Antennae of male inserted at 0.48 length of
1 (4). Body covered dorsally only with white scales.
Elytra narrower, with less prominent humeri (Figs rostrum from base, those of female, at 0.46–0.48
5, 24). Antennal club varyingly long. length. Club of female 3.54, of male 4.20 times as
2 (3). Antennal club weakly or moderately elongate, long as wide.
( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367 361
B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba
Figs 24–28. Ceutorhynchus, dorsal habitus (24, 25, latter plus aedeagus dorsally), head and rostrum dorsally
(26–28). 24, 26, C. kerzhneri sp. nov., female, Primorskiy Terr., holotype; 25, 28, C. melniki sp. nov., male, holo­
type (25) and female, paratype, Mongolia (28); 27, C. unguicularis, female, Krasnodar Terr., Kaluzhskaya Vill.
Photo by G.E. Davidian (24, 25); photo by K.V. Makarov (26–28).
362 ( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367