Caccothryptus abboti, Matsumoto, 2021

Matsumoto, Keita, 2021, Six new species of the genus Caccothryptus from the Himalayas (Coleoptera: Limnichidae), European Journal of Taxonomy 739, pp. 168-184 : 181-183

Caccothryptus abboti sp. nov.

urn:lsid:zoobank.org:act:42E7B7FB-5372-4F1E-9610-14F21C60406F

Figs 6 , 7F

Diagnosis

Caccothryptus abboti sp. nov. is within C. compactus group and can be distinguished by several genital characters: (1) apex of median lobe asymmetrical in ventral view; (2) concave structure between parameres deeply U-shaped with rounded end; (3) parameres deeply curved on dorsal side and gently curved on ventral side in lateral view; (4) apical emargination inward slanted and V-shaped.

Etymology

This species is named after Nick Abbot, who is a radio presenter.

Material examined

Holotype INDIA • ♂; “ AT LIGHT // Haldwani Divn. Kumaon , U.P. // 4016 // 4016 // Caccothryptus testudo, Ch. // Caccothryptus testudo Champ. // H.G. Champion B.M. 1953-156 // NHMUK011225275 ”; BMNH.

Description

Male

BODY. Elongate, oval, dorsum convex, EL: 3.21 mm, EW: 2.62 mm, PL: 1.01 mm, PW: 2.05 mm. Colour: dorsal side brown; venter brown, tibia reddish brown, tarsal claws light brown. Dorsal surface densely covered with long setae with patches of white setae forming a wavy pattern, ventral surface with relatively long setae.

DORSUM. Head: partially retracted into pronotum; overall surface smooth, densely punctured across surface. Antennae: 11 segmented, filiform, fully pubescent, antennomeres long and slender, 1 st AS widest, 2 nd AS narrow and long, 3 rd AS smallest, 4 th –11 th AS long, thin and obtusely angled on one side. Pronotum: transverse, widest at posterior end, narrowest at anterior end, narrower than elytra; anterior margin convex, posterior margin trisinuate, lateral margin convex; surface covered with dense punctation, surface between punctures smooth and shiny. Scutellum: subtriangular, large, lateral sides nearly straight. Elytra: longer than wide; anterior margin slightly convex, sinuate; anterior lateral angle acute, pointed; lateral margins strongly bordered; surface with mixtures of small fine and medium sized punctuations; elytral striae not clearly visible throughout; surface between punctures smooth and shiny.

VENTER. Prosternum: concave on anterior margin, outer lateral margin concave; prosternal process as long as wide, lateral margin sinuated, posterior margin rounded. Mesoventrite: wider than long, narrowed towards posterior; anterior end concave where prosternal process fits, discrimen visible; laterally subparallel and gently curved, posteriorly flat, anteriorly trisinuate. Metaventrite: long and wide, flat on the middle; discrimen thin visible across each end. Abdomen: five clearly visible ventrites. Intercoxal process with pointed apex. Posterior margin of 1 st and 2 nd ventrites convex, 3 rd –4 th ventrites slightly concave around the middle, 5 th ventrite semioval. Surface covered with long, light yellow, recumbent setae.

LEGS. Tibia: protibia with outer and inner lateral ends curved. Meso- and metatibia with outer lateral margin almost straight, inner lateral margin straight. Tarsi: simple, segments increase in length towards the apex, 5 th tarsal segment as long as 1 st –4 th tarsal segment combined. Tarsal claws: long, narrow, symmetrical.

GENITALIA. Aedeagus: elongate, strongly sclerotised. Base: asymmetrical, widest around basal 0.2 in ventral view, widest at middle in lateral view. Median lobe: approximately 2 / 5 the length of genitalia; longer than parameres; curved on both dorsal and ventral side, consistent width, narrows near the apex, apex with rounded in lateral view; apex pointed, split into two on anterior ¼ and edge blunt, lower half of lateral end gently convex in dorsal view; apical end asymmetrical in ventral view. Parameres: wider than median lobe in ventral view; apical emargination inward slanted and V-shaped, concave structure between parameres deep U-shaped with rounded end; narrowed towards apical end, apical end oval in lateral view; deeply curved on dorsal side in lateral view; gently curved on ventral side in lateral view; apex narrow oval and overlaps with median lobe, majority of parameres overlaps with median lobe with no visible spacing in lateral view.

Female

Unknown.

Distribution

Caccothryptus abboti sp. nov. is known only from the type locality.

Figures

Fig. 6. Caccothryptus abboti sp. nov., ♂, holotype (NHMUK011225275). A. Dorsal habitus.B. Genitalia, dorsal. C. Genitalia, lateral. D. Genitalia, ventral.

Fig. 7. Close-up of Caccothryptus spp. genitalia ventral apex, ♂, holotype. A. C. brendelli sp. nov. (NHMUK011225276). B. C. arakawae sp. nov. (NHMUK011225268). C. C. championi sp. nov. (NHMUK011225382). D. C. larryi sp. nov. (NHMUK011225324). E. C. tardarsauceae sp. nov. (NHMUK011225274). F. C. abboti sp. nov. (NHMUK011225275).