A new species of the weevil genus Ceutorhynchus Germar (Coleoptera: Curculionidae) from China

2013·0.26 MB·

by  B. A. Korotyaev

ZOOSYSTEMATICA ROSSICA, 22(1): 82–86 25 JUNE 2013
A new species of the weevil genus Ceutorhynchus Germar
(Coleoptera: Curculionidae) from China
Новый вид жуков-долгоносиков рода Ceutorhynchus Germar
(Coleoptera: Curculionidae) из Китая
B.A. KOROTYAEV
Б.А. КОРОТЯЕВ
B.A. Korotyaev, Zoological Institute, Russian Academy of Sciences, 1 Universitetskaya Emb., St Petersburg 199034,
Russia. E-mail: [email protected]
Ceutorhynchus (Heorhynchus) catenulatus sp. nov. is described from China (Sichuan). It dif-
fers from the two known members of the subgenus Heorhynchus Korotyaev, 1999 in the smaller
size, coarsely catenulate elytra, deeper median sulcus and sharper lateral tubercles on the pro-
notum, usually rufous antennae and tarsi, and truncate apically aedeagus. From C. ibukianus
Hustache, 1916, the new species is distinguished, in addition, by the black colour without clear
blue sheen. Ceutorhynchus philippovi Korotyaev, 1980, described from the south of the Russian
Far East, is synonymized with C. subcoeruleipennis Voss, 1958 described from China.
Описан новый вид жуков-долгоносиков Ceutorhynchus (Heorhynchus) catenulatus sp. nov.
из Китая (Сычуань). Новый вид отличается от двух ранее известных видов подрода
Heorhynchus Korotyaev, 1999 мелкими размерами, грубо бороздчатыми надкрыльями, бо-
лее глубокой срединной бороздкой и более острыми боковыми бугорками переднеспин-
ки, обычно рыжими усиками и лапками, а также обрубленным на вершине эдеагусом. От
C. ibukianus Hustache, 1916 новый вид отличается, кроме того, чернoй окраской без отчет-
ливого синего блеска. Ceutorhynchus philippovi Korotyaev, 1980, описанный с юга Дальнего
Востока России, сведен в синонимы к C. subcoeruleipennis Voss, 1958, описанному из Китая.
Key words: weevils, taxonomy, China, Coleoptera, Curculionidae, Ceutorhynchinae, Ceuto-
rhynchus (Heorhynchus), new species
Ключевые слова: долгоносики, таксономия, Китай, Coleoptera, Curculionidae, Ceuto-
rhynchinae, Ceutorhynchus (Heorhynchus), новый вид
INTRODUCTION classification, I provisionally retain this
only subgenus in addition to the nomino-
The subgenus Heorhynchus Korotyaev
typical one.
(Alonso-Zarazaga & Lyal, 1999: 11) in-
cludes three known species from the Far
East. The distinguishing characters of this MATERIAL AND METHODS
subgenus, originally described as a separate
genus (Korotyaev, 1996), are vague, but The length of body was measured from
they apply to an apparently natural taxon anterior margins of eyes to the apex of ely-
endemic to this region. The type species is tra. Holotype and two paratypes are in the
associated with the plant family Brassica- collection of the United States National
ceae which is typical of the vast majority of Museum of Natural History, Washington
Ceutorhynchus. As the genus Ceutorhynchus (USNM), and one paratype, in the Zoologi-
with over 300 species distributed world- cal Institute, Russian Academy of Sciences,
wide is in an obvious need of a subgeneric St Petersburg (ZIN).
© 2013 Zoological Institute, Russian Academy of Scienсes
B.A. KOROTYAEV. A NEW SPECIES OF CEUTORHYNCHUS FROM CHINA 83
TAXONOMIC PART pattern. Suture with a few short, narrow
white scales behind scutellum. Striae bare.
Order COLEOPTERA
Punctures on underside bearing lanceolate
Family CURCULIONIDAE white scales denser along midline. Femora
moderately densely covered with white lin-
Subfamily CEUTORHYNCHINAE
ear and narrow-lanceolate scales as well as
Genus Ceutorhynchus Germar, 1824 with brown linear scales; posterior surface
of femora and tibiae with dense white lan-
Subgenus Heorhynchus Korotyaev, 1999
ceolate scales; rest of tibiae surface and tarsi
Ceutorhynchus (Heorhynchus) with hair-like white and brown scales.
catenulatus sp. nov. Male. Rostrum 1.40–1.48 times as long
(Figs 1, 2) as pronotum, 1.4 times as broad as apical
part of fore tibia, rather strongly curved
Holotype. Male; China, Sichuan: “Szechuen,
(somewhat more strongly in basal part), al-
China, D.C. Graham”, “Suifu IV.28 – ‘28”
most cylindrical and parallel-sided in basal
(USNM).
half and slightly flattened in apical half
Paratypes. 2 males (USNM, ZIN), 1 female
(slightly tapering toward apex in lateral
(USNM), same data as for holotype.
view), weakly narrowing between anten-
Description. Body length 2.2–2.5 mm.
nal attachment and slightly widened apex.
Body black; antennae and tarsi brown,
Dorsal surface in basal part weakly lustrous
but two apical tarsal segments often bright
or almost matt, densely striolate, with two
rufous. Vestiture sparse. Head capsule with
rows of fine elongate punctures along me-
sparse very narrow, sublinear or hair-like
dian strip slightly raised near base to form
subrecumbent white scales. Punctures on
vestigial median carina. Sides of dorsum
pronotum with similar but longer scales,
with rows of coarser punctures more or less
median sulcus and sides with diffuse stripes
deeply engraved and separated by wrinkles
of broader linear to narrow-lanceolate
but lacking well-defined carinae. Apical
white scales. Granules on elytral intervals
part of rostrum lustrous, with moderately
bearing subrecumbent brown and white
dense elongate punctures. Antennae in-
narrow, almost hair-like scales forming no
serted at 0.37–0.45 length of rostrum from
apex. Scape club-shaped swollen in apical
quarter. Funicle 7-segmented, noticeably
Figs 2–4. Ceutorhynchus (Heorhynchus) spp., ae-
Fig. 1. Ceutorhynchus (Heorhynchus) catenula- deagus dorsally; 2 – C. catenulatus sp. nov., ho-
tus sp. nov., male, holotype. lotype; 3 – C. ibukianus; 4 – C. subcoeruleipennis.
© 2013 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 22(1): 82–86
84 B.A. KOROTYAEV. A NEW SPECIES OF CEUTORHYNCHUS FROM CHINA
thickening apically; second segment about Elytra 1.06–1.09 times as long as wide,
as long as first one; rest segments succes- with strongly convex humeral prominences,
sively shortening: sixth segment slightly weakly roundly widening along short dis-
longer than broad, seventh segment barrel- tance behind latter, afterwards first moder-
shaped and slightly transverse. Pubescence ately, then strongly narrowing toward mod-
on funicle moderately long, but weakly erately convex, obtuse apical prominences.
raised. Club oblong-ovate. Eyes medium- Disc strongly and rather evenly convex
sized, rounded triangular, moderately con- except for flattened or shallowly depressed
vex; in lateral view, their dorsal margins postscutellar area. Striae very broad and
slightly raised above frons level. Frons deep, deepening and narrowing toward
weakly to moderately depressed across its base, with margins rounded in cross-section;
entire width, flattened in cross-section. punctures in striae separated by not less
Temples slightly depressed in upper part; than own diameter. Intervals ca. 1.5 times
vertex narrowly convex at some distance as broad as striae, subcostiform, irregularly
behind eyes, with fine median carina in two covered with small elongate glabrous gran-
of four available specimens. Head capsule ules pointed posteriorly. Larger granules in
weakly lustrous, with dense medium-sized, apical part of discal intervals and on sides
sharply outlined, rather deep punctures. tending to form more or less regular row
Pronotum 1.27–1.42 times as broad as along midline of an interval. Three to five
long, with base shallowly to moderately largest granules in apical part of 4–8th in-
deeply bisinuate or weakly obtuse-angular- tervals with very sharp attenuate apex but
ly produced posteriorly in middle; sides in forming no transverse ridge. Surface of ely-
basal part subparallel, slightly rounded, or tra matt due to shagreened microsculpture.
noticeably diverging toward large, acute, Legs rather long and slender, coarsely
strongly projecting lateral tubercles; there- rugosely punctate; femora weakly widened
after moderately strongly convexly con- distal to middle and forming weak angular
verging to deep constriction separating long prominence bearing bunch of white scales.
apical part. Anterior margin weakly raised, Hind femur not conspicuously differing in
with shallow to moderately deep median width from middle femur and only slightly
emargination limited by two angulations. wider than fore femur. Tibiae moderately
Disc moderately convex, with median sul- long, parallel-sided in middle part, slightly
cus very wide and shallow at base, partly or widening toward apex; fore tibia obsoletely
completely smoothened in middle of disc, outcurved apically, non-mucronate. Mid-
and foveiform deepened behind and in api- dle and hind tibiae noticeably outcurved
cal constriction. Medial part of disc along apically and provided with sharp medium-
sulcus slightly more strongly convex and sized mucro pointed medio-posteriorly.
separated from lateral tubercles by shal- Spines in apical comb of fore tibia becom-
low depressions. Punctation on disc very ing longer toward outer apical angle and
coarse and deep, punctures of varying size barely extending on outer surface of tibia.
separated by flat narrow intervals, matt on Apical comb on hind tibia short, convex,
most of disc and lustrous in places on con- rounded, with dense fine pale spines. Tarsi
vex areas along median sulcus. Postocular moderately long; first segment of fore and
lobes large, rounded. In front view, apical middle tarsus about 1.5 times; first segment
margin thickened at mid-height of sides, 1.5 of hind tarsi about twice as long as broad;
times as wide there as in dorsal part. Corner second segment almost 1.5 times as long as
between ventral end of postocular lobe and broad; third segment of fore tarsus as long
keel before coxae very deeply depressed. and almost twice as broad as second seg-
Scutellum narrow, elongate, flat or convex ment. Claw-segment slender, weakly wid-
to varying degree. ening apically, by 0.6 of its length extend-
© 2013 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 22(1): 82–86
B.A. KOROTYAEV. A NEW SPECIES OF CEUTORHYNCHUS FROM CHINA 85
ing beyond lobes of third segment; claws Comparison. This is the third known spe-
moderately long, moderately diverging, cies of the subgenus Heorhynchus formerly
finely dentate in basal 0.4. including C. ibukianus Hustache, 1916
Punctation of underside coarse, dense (from Japan and Korean Peninsula), and
along midline and sparser on sides of meso- C. subcoeruleipennis Voss, 1958 (described
and metathorax; middle part of mesepimera from China, Fujian Province, “Kuatun”) of
often impunctate. Apices of mesepimera which C. philippovi Korotyaev, 1980 (de-
obtusely ridge-shaped. Metepisterna rather scribed from the south of the Russian Far
strongly convex. Metasternum strongly East) is a junior synonym. The new species
swollen between middle and hind coxae, clearly differs from the two aforementioned
ridge-shaped hanging over hind coxae. species in the smaller size (C. subcoeru-
First ventrite rather deeply depressed be- leipennis has body length above 2.8 mm, and
tween coxae (depression narrowing pos- C. ibukianus is still larger), coarsely catenu-
teriorly), and second ventrite shallowly late elytra, deeper median sulcus and sharp-
depressed only along midline; third and er lateral tubercles on the pronotum, usu-
fourth ventrites flat medially; anal ventrite ally rufous antennae and tarsi, and truncate
along almost its entire length with broad apically aedeagus (see Figs 2–4). From C.
shallow transverse depression limited by ibukianus it differs, in addition, in the black
weak prominences raising to apical margin colour without clear blue sheen.
of ventrite (depression densely covered
with white entire scales at anterior margin Ceutorhynchus (Heorhynchus)
of ventrite, and with yellowish plumose subcoeruleipennis Voss, 1958
scales in posterior part of ventrite). Sides
= C. philippovi Korotyaev, 1980, syn. nov.
of depression and posterior margin of anal
ventrite with dense longer semi-erect hairs. Remark. Examination of the type mate-
Pygidium moderately transverse, weakly rial of C. subcoeruleipennis in the A. Koenig
convex, coarsely punctate, with deep fovea Museum, Bonn, has revealed the synonymy
occupying half-length and about one-third of this name with C. philippovi.
width of pygidium; bottom of fovea almost
impunctate; sides of fovea densely covered ACKNOWLEDGEMENTS
with yellow hairs hanging over fovea. Aede-
agus as in Fig. 2. I greatly appreciate providing the material
Female. Rostrum 1.52 times as long as of the new species for examination by A.S. Kon-
stantinov (USNM) and help in processing the
pronotum, strongly and evenly curved, sub-
figures by M.G. Volkovitsh (ZIN). The study
cylindrical, parallel-sided, weakly lustrous,
was supported by the Russian Foundation for
finely striolate in basal part and with sparse
Basic Research (project No. 13-04-01002а) and
fine elongate punctures and strioles in api-
Ministry of Education and Science of the Rus-
cal part. Antennae inserted at 0.41 length of sian Federation.
rostrum from apex. All tibiae straight, non-
mucronate. Venter weakly evenly convex at
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