Chimarra parafoliata, 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 parafoliata sp. nov.

Fig. 53A-F

Type material.

Holotype. Ghana - Eastern Reg. ● ♂ (in alcohol); Kibi, Subri stream; 6°10'N, 0°33'W; 4 Feb. 1993; J Kjærandsen leg.; at light; UMSP 000550067.

Diagnosis.

This species is undoubtedly closely related to Chimarra foliata Kimmins and C. giboni sp. nov. as evidenced by its foliate dorsal lobes of tergum X. It is most similar to C. foliata in the overall structure of its inferior appendages and in the general shape of segment IX, which has its posteroventral margin expanded at the level of the inferior appendages, and by the general lobate and semi-sclerotized structure of the endotheca. It differs diagnostically in the shape of its inferior appendages, which have a broader basodorsal lobe and also an acute ventral apex, as viewed laterally. The semi-sclerotized endotheca also seems to be somewhat different in shape, more elongate in C. parafoliata than in C. foliata , but the constancy and significance of this difference is difficult to assess.

Description.

Adult. Overall color (in alcohol) yellowish brown, head slightly darker, setal warts of head pale, contrasting. Head short (postocular parietal sclerite short). Palps elongate; maxillary palp with 1st segment very short (approximately as long as wide), 2nd segment moderately elongate (~ 3 × 1st), apex with cluster of ~ 8-10 stiff setae, 3rd segment moderately elongate, slightly longer than 2nd, 4th segment short (~ 1/2 length of 2nd), 5th segment very elongate and narrow (subequal to 3rd and 4th combined). Forewing length: male, 4.0 mm. Forewing forks I, II, III, and V present; hind wing with forks II and V only. Forewing with R1 nearly straight, stem of Rs weakly inflected, basal fork of discoidal cell distinctly enlarged, evenly forked, length of cell slightly> 2 × width, forks I and II sessile, r crossvein not evident, s, r-m, and m crossveins linear and hyaline, both 2A and 3A looped to 1A (2A without apical fork). Hind wing with R1 obsolete (or fused to subcosta), fork II sessile, anal loop small. Forelegs with apical tibial spur short; male with modified tarsal claws, apical three segments of tarsi short and flattened, claws asymmetrical, outer one elongate and twisted.

Male genitalia. Segment VIII short, dorsal margin of tergum slightly expanded, sternum without posteroventral projection. Segment IX, in lateral view, with anterior margin nearly straight, ventral margin very distinctly expanded at level of inferior appendages, segment narrowing and convergent dorsally, dorsal margin without apodemes, but with paired, elongate, narrow, scabrous, posteriorly-directed processes from posterolateral margin, apices of processes acute, ventral process very short, ventrally projecting; as viewed dorsally, with tergum discontinuous mesally, posterior processes widely separated basally, mesally curved apically, sternum short, subtruncate. Tergum X with short membranous mesal lobe, lateral lobes with expanded foliate basal lobes and narrow, projecting apices; sensilla probably only two on each lobe, one apical and one preapical on narrow apical projection. Preanal appendages moderately large and knob-like, distinctly flattened, constricted basally, inserted membranously (not fused to segments IX or X). Inferior appendage, as viewed laterally, relatively short, convexly rounded basally, dorsally with rounded projection with marginal setae, apically with short, angular projections on ventral margin and midlaterally, the latter with sclerotized cusp projecting from mesal margin. Phallic apparatus with phallobase short, ventral apex short and deflexed, rounded apically, well anchored within segment by semi-sclerotized periphallic membrane (attached to lateral margin of segment IX); endotheca elongate, lightly sclerotized, with evident structure including dorsal, lateral, and apical lobes; phallotremal sclerite complex indistinct, apparently composed of short rod and ring structure.

Etymology.

Chimarra parafoliata , the species name meaning alongside or next to, because of the great similarity of this species to C. foliata Kimmins.

Figures

Figure 53. Chimarra parafoliata sp. nov., ♂ genitalia A lateral B dorsal, segments IX and X C inferior appendage, caudal D inferior appendage, dorsal E phallus, lateral F phallus, ventral.