Chimarra latidentis, Blahnik & Andersen, 2022

Blahnik, Roger & Andersen, Trond, 2022, New species of the genus Chimarra Stephens from Africa (Trichoptera, Philopotamidae) and characterization of the African groups and subgroups of the genus, ZooKeys 1111, pp. 43-198 : 43

Chimarra latidentis sp. nov.

Fig. 41A-F

Type material.

Holotype. Tanzania - Tanga Reg. ● ♂ (in alcohol); West Usambara Mts, Mazumbai, Kaputu Stream; 4°48'S, 38°30'E; 27-28 Oct. 1990; T Andersen leg.; Malaise trap; UMSP 000550038. Paratypes. Tanzania - Tanga Reg. ● 34♂♂; same data as for holotype except 27 Oct. 1990-12 Feb. 1991; ZMBN ● 1♂; West Usambara Mts, Shokoi River; 4°46'S, 38°29'E; 24 Nov. 1990; T Andersen leg.; sweep net; UMSP.

Diagnosis.

Chimarra latidentis is closely related to C. leptodactylus sp. nov. and C. vermitergata sp. nov. It is most similar to C. vermitergata in having the lateral lobes of tergum X formed into upright, spine-like processes, without a separated ventral projection. At least in the holotype of C. latidentis , these lobes are thicker, undivided and have their apices somewhat scabrous. The mesal cusps of the inferior appendages in C. latidentis are also wider, larger, and more prominent than in C. vermitergata , and the basal sclerotized portion of the endotheca, posterior to the sclerotized ventral apex of the phallobase, is more rounded.

Description.

Adult. Overall color (in alcohol) medium brown to yellowish brown, head darker (dark brown), setal warts of head paler and somewhat contrasting. Head short (postocular parietal sclerite relatively short, shorter than eye). Palps elongate; maxillary palp with 1st segment very short (approximately as long as wide), 2nd segment short (~ 2 × 1st), apex with cluster of ~ 8 stiff setae, 3rd segment very elongate (nearly 3 × 2nd), 4th segment short (shorter than 2nd), 5th segment elongate and narrow (subequal to 3rd). Forewing length: male, 5.0-6.0 mm. Fore- and hind wings with forks I, II, III, and V present. Forewing with R1 straight, stem of Rs straight, or nearly so, basal fork of discoidal cell slightly enlarged, evenly forked, discoidal cell relatively elongate and narrow, length of cell nearly 3 × width, fork I with long stem, fork II subsessile, r crossvein diagonal, intersecting discoidal cell near s crossvein, s, r-m, and m crossveins hyaline, s and r-m linear, m crossvein somewhat proximal and diagonal, both 2A and 3A looped to 1A (2A without apical fork). Hind wing with R1 obsolete (or fused to subcosta), fork I with very short stem, fork II subsessile, fork III distal and very narrow, anal loop small. Forelegs with apical tibial spur short; male with tarsal claws not enlarged, claws symmetrical, tarsal segments narrow.

Male genitalia. Segment VIII with sternum very short, tergum ~ 2 × as long, dorsal margin projecting, sternum without posteroventral projection. Segment IX, in lateral view, short, anteroventral margin only slightly expanded, anterodorsal margin without apodemes, posterior margin angularly projecting below preanal appendages, sternum with very short, rounded ventral process from posterior margin, inferior appendages inserted somewhat above ventral margin; as viewed dorsally, with tergum very narrow, but continuous (or nearly so), sternum very short, subtruncate. Tergum X with mesal lobe short and membranous, lateral lobes short and sclerotized, each modified into short, upturned spine-like projection from basoventral margin, apex of projection rugose; sensilla of lobes absent (or not evident). Preanal appendages very short and rounded, slightly flattened, inserted membranously (not fused to segments IX or X). Inferior appendage with weak basal inflection; as viewed laterally, short, with apicodorsal margin somewhat angulate and laterally projecting; as viewed ventrally, subtruncate apically, with mesal margins of opposite appendages proximate, then sharply bent; mesal surface with wide, sclerotized, tooth-like projection, apparently articulating with sclerotized ventral projection of phallobase. Phallic apparatus with phallobase very short and strongly sclerotized, with usual basodorsal expansion, securely anchored within segment by sclerotized periphallic membrane (and apparently fused to it); apicoventral margin of phallobase (or projections from periphallic membrane) very distinctly sclerotized and produced, down-turned, apex divided mesally, apparently articulating with tooth-like projections of mesal surface of inferior appendages; phallic apparatus distal to sclerotized ventral projection (possibly modified endotheca), forming short, sclerotized, bulbous extension of phallobase; endotheca approximately as long as phallobase, apicodorsally with pair of small membranous lobes, basally with pair of very short, symmetrically positioned spines; phallotremal sclerite complex composed of short rod and ring structure.

Etymology.

Chimarra latidentis , used as a noun in apposition, from the Latin latus, meaning broad or wide, and dens, a tooth, for the relatively large, wide tooth-like cusp on the mesal surface of the inferior appendage.

Figures

Figure 41. Chimarra latidentis sp. nov., ♂ genitalia A lateral B dorsal, segments IX, X, and phallus C inferior appendage, ventral D inferior appendage, dorsal E phallus, lateral F caudal.