Chimarra giboni, 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 giboni sp. nov.

Fig. 50A-D

Type material.

Holotype. Ghana - Western Reg. ● ♂ (in alcohol); Ankasa Game Production Reserve; 5°15'N, 2°37'W; 6-12 Dec. 1993; T Andersen & J Kjærandsen leg.; Malaise trap; UMSP 000550050. Paratypes. Ghana - Western Reg. ● 4♂♂; same data as for holotype; ZMBN. - Central Reg. ● 3♂♂; Kakum Forest Reserve; 5°21'N, 1°22'W; 8-15 Nov. 1994; T Andersen leg.; Malaise trap; ZMBN.

Additional material.

Ghana - Central Reg. ● 9♀♀; Kakum Forest Reserve ; 5°21'N, 1°22'W; 8-15 Nov. 1994; T Andersen leg.; Malaise trap; ZMBN ● 1♀; same collection data as for preceding; UMSP. - Western Reg. ● 69♀♀; Ankasa Game Production Reserve; 5°15'N, 2°37'W; 6-12 Dec. 1993; T Andersen & J Kjærandsen leg.; Malaise trap; ZMBN ● 1♀; same collection data as for preceding; UMSP .

Diagnosis.

This species is probably most closely related to Chimarra foliata Kimmins and C. parafoliata sp. nov., resembling both in having foliate basal projections on the lateral lobes of tergum X and in having the posterior margin of segment IX strongly produced at the level of the inferior appendage. It differs in the much more elongate and apically projecting inferior appendages, without a mesal tooth or cusp, and in that the posterior projection of segment IX is at, or nearly at, the ventral margin of the segment.

Description.

Adult. Overall color (in alcohol) yellowish brown, vertex of head slightly darker. 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 (~ ½ length of 2nd), 5th segment very elongate and narrow (subequal to 3rd and 4th combined). Forewing length: male, 3.2-4.0 mm; female, 3.5-4.5 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 very weakly inflected, basal fork of discoidal cell slightly enlarged, evenly forked, length of cell ~ 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, sternum without posteroventral projection. Segment IX, in lateral view, with anterior margin nearly straight, ventral margin very distinctly expanded, forming projection point for attachment of inferior appendages, segment narrowing and convergent dorsally, dorsal margin without apodemes, but with paired, elongate, narrow, scabrous, posteroventrally directed processes from posterolateral margin, apices of processes acute, ventral process of segment apparently obsolete; as viewed dorsally, with tergum discontinuous mesally, posterior processes widely separated basally. Tergum X with membranous mesal lobe, divided mesally, lateral lobes with expanded foliate basal lobes and narrow, projecting apices; sensilla two on each lobe, one preapical and one apical, on narrow projection. Preanal appendages small and knob-like, rounded, constricted basally, inserted membranously (not fused to segments IX or X). Inferior appendage, as viewed laterally, relatively elongate, subtriangular, with basodorsal expansion, gradually narrowing to acute apex, without cusp or tooth on mesal margin; as viewed ventrally, with apex narrowed and mesally curved. Phallic apparatus with phallobase short, well anchored within segment by semi-sclerotized periphallic membrane (attached to lateral margin of segment IX); apex of phallobase and endotheca not well demarcated, endotheca apparently weakly sclerotized, forming looped structure with rounded apex; phallotremal sclerite complex small and indistinct, composed of short rod and ring structure and weakly sclerotized apical structure.

Etymology.

We take pleasure in naming this species Chimarra giboni for François-Marie Gibon, in recognition of his many contributions to the taxonomy of Trichoptera in Africa and Madagascar, and especially the genus Chimarra .

Figures

Figure 50. Chimarra giboni sp. nov., ♂ genitalia A lateral B dorsal, segments IX and X C inferior appendage, ventral D phallus, lateral.