A New Species of the Genus Ascetoderes (Coleoptera, Bothrideridae) from Mt.Koya-san, Central Japan

2010·1.4 MB·English

by  Aoki, J

Elytra,Tokyo,38(1):19(cid:2)23,May31,2010
A New Species of the Genus Ascetoderes (Coleoptera, Bothrideridae)
from Mt. Kˆoya-san, Central Japan
Jun-ichi AOKI
3(cid:2)8(cid:2)12Nishi-azabu,Minato-ku,Tokyo,106(cid:2)0031Japan
Abstract A third Japanese species of the genus Ascetoderes, A. koyasanus sp.
nov.,isdescribedfromMt.Kˆoya-saninWakayamaPrefectureofCentralJapan. Itis
very similar to A. popei (N6@6C:, 1967) known from the Bonin Islands, but is
distinguishable from the latter by glossy body surface, shorter antennae with wider
terminal antennomere, indistinct elytral sculpture and smoothly rounded posterior
marginofventrites. AkeytothethreeJapaneseAscetoderesspeciesisgiven.
In1990,Mr.IsamuT6C6@6(NishinomiyaCity)collectedahandsomebothriderid
beetle of the genus Ascetoderes on Mt. Kˆoya-san of Central Japan. The author
considered at first that it must be A. takeii N6@6C:, 1968, which is known from the
mainland of Japan. Contrary to his expectation, however, it is not identified with A.
takeii,butisrathersimilartoA.popeiN6@6C:,1978fromtheBoninIslandsfardistant
from the mainland. It was doubtful if the two forms belonged to the same species,
because their localities are far distant from each other and they are located in di#erent
climaticzones. Detailedcomparisonrevealedthattheywerenotidenticalatthespecies
level. Thus, a new species is described below on the specimen from Mt. Kˆoya-san.
Ascetoderes koyasanus sp. nov.
(Figs.1&2)
Body length: 4.2mm.
Color:(cid:3) Dark reddish brown, shining (Fig. 2A).
Head with anterior clypeal border truncated, beset with a row of short yellowish
setae; clypeus finely punctate; interspace of eyes 2.5(cid:2) as long as eye. Antennae (Figs.
1B & 2C) 11-segmented; antennomere III a little longer than wide; exposed parts of
antennomeres IV(cid:2)IX a little wider than long; exposed part of X 1.6(cid:2) and XI 1.4(cid:2) as
wide as long; penultimate antennomere (X) 1.32(cid:2) as wide as terminal one (XI).
Pronotum a little longer than wide, 1.1(cid:2) as long as wide, widest near anterior
border and narrowest at posterior border (the ratio 1.5:1.0); lateral margin nearly
straight and emaginate; anterolateral corners each with projection rounded at tip;
median part of pronotum showing an elongate linguiform depression constricted at
middle; pronotal surface with elongate oval punctures.
20 Jun-ichiAD@>
Fig.1. Ascetodereskoyasanussp.nov.,holotype.(cid:3)(cid:3)A,Dorsalview;B,antenna(rightside).
Elytra 2.3(cid:2) as long as wide; each elytron provided with five strong longitudinal
carinae; carinae III and IV fused together apically before connecting to carina V (Fig.
2E); round or polygonal sculptures on interspaces of carinae weakly developed (Figs.
2D&E),theirnumberbetweencarinaeIIIandIV71(cid:2)73;elytralsetaeveryminuteand
hardly visible.
Ventriteswithovalorcircularpunctures,eachaccompaniedbyafineseta inserted
just on anterior margin of puncture; posterior margin of ventrite V smoothly rounded
(Fig. 2F).
Holotype (NSMT(cid:2)I(cid:2)C-200138): (cid:2) Mt. Kˆoya-san, Wakayama Prefecture, Central
Japan, 23(cid:2)VII(cid:2)1990, Isamu T6C6@6 leg. Deposited in the collection of the National
Museum of Nature and Science, Tokyo (NSMT).
NewAscetoderesfromMt.Kˆoya-san 21
Fig.2. Ascetoderes koyasanus sp. nov., holotype.(cid:2)(cid:2)A, Dorsal view; B, head and pronotum; C,
antenna (right side, antennomeres I(cid:3)III omitted); D, basal half of elytron (right side); E, apical
halfofelytron(rightside);F,ventritesIVandV.
Ascetoderes popei N6@6C:, 1978
(Fig.3)
AscetoderespopeiN6@6C:,1978,p.157,fig.4A.
Ascetoderessp.:N6@6C:,1977,p.152.
Bothrideressp.:N6@6C:,1970,p.25.
A number of specimens were collected on the Bonin Islands (Chichijima and
Hahajima Islands). Distinguishing characters between A. popei N6@6C: and A.
koyasanus sp. nov. are shown in Table 1 and the key.
22 Jun-ichiAD@>
Fig.3. Ascetoderes popei N6@6C:.(cid:2)(cid:2)A, Dorsal view; B, head and pronotum; C, antenna (right
side); D, basal half of elytron (right side); E, apical half of elytron (right side); F, ventrites IV
and V. A and B, Fukurozawa, Chichijima Is., 11(cid:3)VI(cid:3)1976, T. N6@6C: leg.; C(cid:3)F, Mt Funaki,
HahajimaIs.,25(cid:3)X(cid:3)2008,J.AD@>leg.
Key to the Three Japanese Species of Ascetoderes
1. Pronotum as long as wide; median depression on pronotum broad and nearly
rectangular. (cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)A. tekeii (N6@6C:, 1967)
(cid:2) Pronotum longer than wide; median depression on pronotum narrow and con-
stricted at middle. (cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)2
2. Body surface not shining; terminal antennomere (XI) distinctly narrower than
penultimateone(X);posterolateralcornersofpronotumangular.(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)
(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)A.popeiN6@6C:,1978
(cid:2) Body surface shining; terminal antennomere (XI) a little narrower than penulti-
NewAscetoderesfromMt.Kˆoya-san 23
Table1. DistinguishingcharactersbetweenA.popeiN6@6C:andA.koyasanussp.nov.
A.popeiN6@6C: A.koyasanussp.nov.
Bodylength 3.0(cid:3)6.5mm 4.2mm
Bodysurface lusterless lustrous(glossy)
Puncturesonhead largeandfusedtogether smallandclearlyseparatedfrom
longitudinally oneanother
AntennomereXI distinctlynarrowerthanX alittlenarrowerthanX
AntennomeresIV(cid:3)IX aslongaswide widerthanlong
Anterolateralprojectionof angular roundedattip
pronotum
Posterolateralcornersof angular notangular
pronotum
Number of polygonal sculptures 56(cid:3)58 71(cid:3)73
onelytralcarinaeIIIandIV
Distribution(climaticzone) theBoninIslands(subtropical) Honshu,C.Japan(cool-temperate)
mateone(X);posterolateralcornersofpronotumnotangular. (cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)
(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)(cid:2)A.koyasanussp.nov.
(cid:2) (cid:3)
(cid:3)(cid:4)(cid:5)(cid:6)(cid:7) (cid:8)(cid:9)(cid:10)(cid:11)(cid:12)(cid:13)(cid:12)(cid:14)(cid:15)(cid:16)(cid:17)(cid:18)(cid:19)(cid:20)(cid:21)(cid:22)(cid:23)(cid:24)(cid:25)1(cid:26)(cid:27) (cid:28)(cid:29)(cid:30)(cid:31) (cid:30)!(cid:22)"#$(cid:18)(cid:19)(cid:20)(cid:21)
(cid:22)(cid:23)%&’ (cid:2)(cid:2) ()*(cid:16)(cid:17)(cid:18)(cid:19)(cid:20)(cid:21)(cid:22)(cid:23)(cid:24)+,(cid:22)-./(cid:16)(cid:17)(cid:18)(cid:19)(cid:20)(cid:21)(cid:22)(cid:23)Ascetoderes takeii
(N6@6C:)01234567(cid:16)(cid:17)(cid:18)(cid:19)(cid:20)(cid:21)(cid:22)(cid:23)A. popei N6@6C:(cid:25)2(cid:27)89(cid:12)(cid:14):;<8= >
?= @A(cid:10)B(cid:8)(cid:9)(cid:10)(cid:11)(cid:12)C3(cid:25)(cid:27)8DEF(cid:14)= (cid:26)(cid:27)GHIF(cid:14)(cid:15)(cid:25)J= (cid:29)(cid:30)K(cid:16)(cid:17)(cid:18)(cid:19)(cid:20)(cid:21)(cid:22)(cid:23)
Ascetodereskoyasanussp.nov.GL:MNOPL(cid:15)’ QRS(cid:25)TUVWXY<G)Z*(cid:25)(cid:22)-./
(cid:16)(cid:17)(cid:18)(cid:19)(cid:20)(cid:21)(cid:22)(cid:23)+[;G\](cid:14)(cid:15)8= ^_I‘G+abc(cid:14)(cid:15)defgh(cid:25)34567(cid:16)(cid:17)(cid:18)
(cid:19)(cid:20)(cid:21)(cid:22)(cid:23)+1bi:;<’ L(cid:11)L= jk+lm8no= pqrs(cid:25)tu8(cid:15)8;+c(cid:14)= vw
xy(cid:25)2z8{|b= }~(cid:25)(cid:127)(cid:128)(cid:25)(cid:129)8(cid:130);‘GI(cid:131)+1(cid:132):def*(cid:25)(cid:27)G(cid:133)(cid:134)F(cid:14)<’
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