A New Species of Paraneseuthia Franz (Insecta, Coleoptera, Scydmaenidae) from Japan

2006·0.18 MB·English

by  Jaloszyński, P

Bull. Natn. Sci. Mus., Tokyo, Ser. A, 32(3), pp. 133–135, September 22, 2006
A New Species of Paraneseuthia Franz (Insecta, Coleoptera,
Scydmaenidae) from Japan
PawelJaloszyn´ski
⁄ ⁄
Os. Wichrowe Wzgórze 22/13, 61-678 Poznan´, Poland
email: [email protected]
Abstract A new species of Paraneseuthia Franz, P. inexpectata sp. nov., is described. The type
material has been collected in Kanagawa Pref., central part of Honshu, and the new species is the
third representative of the genus known to occur in Japan. External morphology of P. inexpectatais
very similar to that of P. trepidaKurbatov and P. sagaKurbatov (both known from the Russian Far
East); unique structures of the aedeagus allow for unambiguous discrimination between these three
allied species. Illustrations of the aedeagus and habitus photo are given.
Key words: Coleoptera, Scydmaenidae, Paraneseuthia, taxonomy, new species, Japan.
asodes sp. (Staphylinidae, Pselaphinae) were
Introduction
found, but no scydmaenids. Also this time the
Two species of ParaneseuthiaFranz have been hollow tree was found to be inhabited by pse-
reported to occur in Japan: P. paradoxa (K. laphines: Diartiger kubotai Nomura, and an un-
Sawada) (originally described in Euthiconus Re- described species of Tribasodes. The new
itter), and P. holzneri(Franz) (originally placed in Paraneseuthia is described herein under the
Eutheia Stephens). Both species were very re- name of P. inexpectatasp. nov.; the type material
cently redescribed, and the genus was transferred is deposited in the National Science Museum,
from the tribe Cephenniini to the Eutheiini Tokyo, Japan (NSMT) and the private collection
(Jal⁄oszyn´ski & Hoshina, 2004). Paraneseuthia of the author, Poznan´, Poland (PCPJ).
paradoxa is known from scarce findings in eight
prefectures in Honshu and Kyushu, and the holo-
Paraneseuthia inexpectatasp. nov.
type male of P. holzneri collected in Tokyo Pref.
(Figs. 1, 2A, B)
is the only known specimen of that mysterious
species. The beginning of my second stay in Diagnosis. This species differs from all con-
Japan (from July 2005) brought an unexpected geners in the shape of the aedeagus, which has
finding of three individuals of Paraneseuthia, bilobate apex of the median lobe and a pair of
found in Sagamiko environs, in the northern part blunt, curved rod-like sclerites covered with
of Kanagawa Pref., central Honshu. The beetles, minute denticles.
collected from a wet rotten wood accumulated in- Description. Body small, elongate, relatively
side a hollow deciduous tree, included two males convex, testaceus, legs, palpi and antennae slight-
and a female, clearly representing an undescribed ly lighter, vestiture yellowish.
species. Interestingly, mountains and river valleys Male. (Fig. 1). Body length: 1.03–1.06mm
around Sagamiko were visited by me nearly (mean 1.04mm); head widest at large, very con-
twenty times during my previous stay in Japan, vex and coarsely faceted eyes, length 0.15–0.16
and rotten wood from the same hollow tree was mm (mean 0.155mm), width 0.20mm, vertex
already sifted two years before. At that time, in- and frons convex, covered with sparse and fine
dividuals of Morana elegansTanokuchi and Trib- punctures; setation sparse, composed of short,
134 P. Jal⁄oszyn´ski
Fig. 2. Paraneseuthia inexpectata; aedeagus in
dorsal (A) and lateral (B) views. Scale:
0.1mm.
obtuse; basal margin nearly straight; base with
pair of shallow lateral impressions. Punctation
moderately dense, very fine but sharply marked
and well visible under 40(cid:1) magnification; seta-
tion moderately dense, relatively short, composed
of thin, recumbent to suberect setae.
Elytra oval, broadest between middle and ante-
Fig. 1. Paraneseuthia inexpectata sp. nov., holo-
type male. Actual length 1.06mm. rior third, length 0.54–0.55mm (mean 0.545
mm), width 0.40–0.42mm (mean 0.41mm), EI
suberect setae. Antennae 0.32–0.35mm in length (elytral index(cid:2)length/width) 1.31–1.35. Humeral
(mean 0.33mm), antennomere I 2.5 times as long calli only slightly raised; single basal fovea on
as broad, slightly flattened dorso-ventrally, anten- each elytron very shallow and barely visible, lo-
nomere II as long as 1.5 length of I, 1.5 times as cated closer to humeral callus than to large, trian-
long as broad, antennomeres III–V each about as gular scutellum with shallow circular median im-
long as broad and half as long as II, VI–VIII pression near its anterior margin; apices of elytra
each slightly larger than V, IX broader than long, broadly rounded. Punctation dense and com-
about 1.5 times as broad as VIII, X slightly posed of punctures much larger than those on
broader and slightly longer than IX, transverse, pronotum, punctures are slightly irregular so that
antennomere XI subconical with rounded sides surface of elytra appears coarse; setation distinct-
and blunt apex, about as long as IX–X together, ly longer than that on pronotum, composed of
slightly broader than X. thicker setae, which are moderately dense and
Pronotum nearly subquadrate, slightly broader suberect. Hind wings well developed, about twice
than long, broadest near middle or slightly anteri- as long as elytra.
or to middle, length 0.25–0.26mm (mean 0.255 Pygidium subtriangular with rounded sides
mm), width 0.27–0.3mm (mean 0.28mm). Ante- and apex, covered with moderately dense punc-
rior margin broadly rounded; lateral margins only tures and short suberect setae.
slightly rounded, very finely serrate; hind angles Metasternum regularly convex, with fine but
A New Species of Paraneseuthiafrom Japan 135
relatively dense punctation. the internal margin of protibiae in males (Fig. 2F
Legs long and slender, with protibiae curved in Jal⁄oszyn´ski & Hoshina, 2004). Moreover,
inwards and distinctly angulate between basal males of this species have modified, impressed
third and middle of inner margin; mesotibiae re- metasternum. Males of the remaining species—
curved; metatibiae nearly straight; all tarsi longer P. holzneri, P. sagaKurbatov, P. trepidaKurbatov,
than half length of tibiae. and the newly described P. inexpectata—have
Aedeagus (Figs. 2A, B) small, 0.22mm in protibiae bent and distinctly angulate, but their
length, with pair of oval lobes protruding from internal margin does not bear any denticle, and
apex, deeply emarginate between lobes, and with their metasterna are regularly convex. They are
pair of rod-like, blunt sclerites covered with externally almost identical, and can be unam-
coarse sculpture resembling minute denticles; biguously distinguished only by examination of
parameres slender, not exceeding apex of median the aedeagus. Paraneseuthia saga and P. trepida
lobe, each bearing single, long apical seta. are known from the Russian Far East, whereas P.
Female. Externally similar to male, differs in holzneri was described from Tokyo Prefecture,
less distinctly curved protibiae and slightly more Honshu, Japan. Its type locality is in the Okuta-
stout elytra; body length 1.01mm, length of head ma area, relatively close to the type locality of P.
0.16mm, width of head 0.20mm, length of an- inexpectata. The only known male specimen of
tenna 0.32mm, length of pronotum 0.26mm, the former species is distinctly smaller than
width of pronotum 0.29mm, length of elytra males of the new member of the genus (0.89mm
0.50mm, width of elytra 0.40mm, EI 1.25. vs. 1.03–1.06mm). The aedeagus of P. inexpecta-
Holotype, ?, white printed label “JAPAN, tais most similar to that of P. trepida, which also
Kanagawa Pref., Mt. Arashiyama ad Sagamiko, has elongate lobes in the apical part of the medi-
ca. 300m, 23. vii. 2005, in rotten wood of hol- an lobe. However, the median part of apex is dis-
low, alive tree, P. Jal⁄oszyn´ski leg.” and red print- tinctly different in those two species, with a T-
ed label “PARANESEUTHIA inexpectata m., det. shaped median structure in P. trepida, not present
P. Jal⁄oszyn´ski, 2006, HOLOTYPUS” (NSMT). in P. inexpectata.
Paratypes: 1?, 1/, same data as for holotype, ex-
cept for yellow label with “PARATYPUS”
Acknowledgments
(PCPJ).
I express my sincere thanks to Dr. Shûhei No-
Distribution. Japan, Central Honshu (Kana-
mura (National Science Museum, Tokyo, Japan)
gawa Prefecture).
for his kind and irreplaceable help during my
Etymology. This species is named “inexpec-
stays in Japan, and for identifying some pse-
tata” because of its surprising discovery in a
laphines collected together with Paraneseuthia.
place where frequent previous collectings have
not brought any Paraneseuthia.
Remarks. Far Eastern species of Parane- Reference
seuthia have a very uniform morphology, and
Jal⁄oszyn´ski, P., & H. Hoshina, 2004. Revision of Japan-
only Japanese P. paradoxa is easily distinguish-
ese species of ParaneseuthiaFranz (Coleoptera, Scyd-
able on the basis of a minute denticle located on maenidae). Jpn. J. syst. Ent., 10: 133–143.