Chimarra tangaensis, 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 tangaensis sp. nov.

Fig. 35A-E

Type material.

Holotype. Tanzania - Tanga Reg. ● ♂ (in alcohol); West Usambara Mts., Mazumbai, Kaputu Stream; 4°48'S, 38°30'E; 4-13 Dec. 1990; T Andersen leg.; Malaise trap; UMSP 000550032. Paratypes. Tanzania - Tanga Reg. ● 5♂♂; same data as for holotype except 31 Oct. 1990-13 Jan. 1991; ZMBN.

Diagnosis.

Chimarra tangaensis probably has its overall greatest similarity to C. dulensis sp. nov., particularly in the general shape of its inferior appendages, and in having an elongate, tubular phallobase with slender and symmetrically positioned phallic spines. It is easily distinguished by the more spine-like lateral lobes of tergum X. It is possible that the latter character reflects a closer relationship to the other new species of the Chimarrha ruficeps subgroup described here, which have the lobes even more dramatically developed into spine-like processes.

Description.

Adult. Overall color (in alcohol) medium brown. Head relatively elongate (length of postocular parietal sclerite nearly equal to diameter of eye). Palps moderately elongate, maxillary palp with 1st segment very short (slightly longer than wide), 2nd segment short (~ 2 × 1st), apex with small cluster of stiff setae, 3rd segment elongate, almost 2 × length of 2nd, 4th segment short (subequal to 2nd), 5th segment elongate (slightly longer than 3rd). Forewing length: male, 7.5-8.5 mm. Fore- and hind wing with forks I, II, III, and V present. Forewing with R1 slightly sinuous, stem of Rs weakly inflected at past midlength (with indistinct node at inflection, almost appearing as crossvein), basal fork of discoidal cell somewhat enlarged, fork almost symmetric, discoidal cell elongate, length ~ 2 1/2 × width, forks I and II slightly subsessile, r crossvein diagonal, intersecting discoidal cell at past midlength, before fork I, s and r-m, crossveins linear, m crossvein more proximal, ~ 1/2 way between basal fork of M and r-m crossvein, s pigmented (like wing), r-m and m crossveins hyaline, 2A with crossvein (apparently forked apically to 1A and 3A). Hind wing with R1 fused to subcosta basally, both veins intersecting wing margin, forks I and II slightly subsessile. Forelegs with apical tibial spur distinct; male with foretarsi unmodified, claws small and symmetrical.

Male genitalia. Segment VIII with sternum short, without ventromesal projection, tergum slightly longer. Segment IX, in lateral view, with anteroventral margin greatly, subangularly, produced, anterodorsal margin with prominent apodeme, margin between strongly concave; dorsomesal margin of segment strongly concave, very short, but continuously sclerotized; segment, in lateral view, very short dorsally, posterior margin obliquely and almost linearly widened to inferior appendage, ventral margin rounded, ventral process emerging somewhat below inferior appendages, very elongate, digitate, with apex rounded in lateral view, apex with short spines or setae; anteroventral margin of segment, in dorsal or ventral views, very strongly concave. Lateral lobes of tergum X moderately elongate, divided into dorsal and ventral lobes, ventral lobes (possibly sclerotized extensions of periphallic membrane) relatively lightly sclerotized, wide basally, subacute apically, dorsal lobes more distinctly sclerotized, with rounded and projecting basodorsal process and posteriorly projecting apical process, narrowing to a somewhat spine-like apex, sensilla not apparent; mesal lobe of tergum X short, membranous, only extending to basodorsal processes of dorsal lobes of lateral lobes. Preanal appendages short and knob-like, weakly constricted basally. Inferior appendage relatively short, rounded basally, with moderate basal inflection, apex narrowed, acute, moderately posteriorly projecting; in caudal view, with rounded projection from dorsomesal margin. Phallic apparatus with phallobase elongate, tubular, with usual basodorsal expansion, apicoventral margin slightly projecting and somewhat downturned; endotheca membranous and apparently elongate, with two moderately elongate, slender, symmetrically positioned spines, phallotremal sclerite complex composed of moderately elongate rod and ring structure, with small apical sclerites.

Etymology.

Chimarra tangaensis , used as an adjective, meaning "from Tanga," for the region in Tanzania in which this species was collected.

Figures

Figure 35. Chimarra tangaensis sp. nov., ♂ genitalia A lateral B dorsal, segments IX and X C inferior appendage, ventral D inferior appendage, caudal E phallus, lateral, with dorsal detail of phallotremal sclerite complex.