Chimarra togoana (Ulmer, 1907)

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 togoana (Ulmer, 1907)

Fig. 14A-E

Wormaldia togoana Ulmer, 1907: 42-43, figs 61-63.

Chimarrha togoana (Ulmer): Ulmer 1931: 3.

Chimarra togoana (Ulmer): Fischer 1961: 71; Gibbs 1973: 67 (distribution: Ghana).

Material examined.

Ghana - Volta Reg. ● 1♂ 2♀♀; Wli, Agumatsa waterfall, station # 3; 7°07'29"N, 0°35'31"E; 17 Nov. 1993; J Kjærandsen leg. ; light trap; ZMBN ● 1♂; same collection data as for preceding; UMSP ● 3♀♀; same collection data as for preceding except station # 10; 11 Nov. 1993 ; ZMBN ● 1♀; same collection data as for preceding except 20 Nov. 1993; J Kjærandsen leg. ; UMSP.

Diagnosis.

Chimarra togoana is a very distinctive species, readily identified by the elongate, apically flared shape of its inferior appendages, with a distinctive mesal cusp at approximately midlength, and the elongate ventral process of segment IX, which is somewhat inflated apically, but apparently lacks the cluster of apicoventral spines characteristic of species in the Chimarrha ruficeps subgroup. It is only provisionally placed in the Chimarrha fallax subgroup since some of its characters could equally well be used to place it in the Chimarrha ruficeps subgroup. Characters supporting the latter interpretation include the overall shape of segment IX, which is strongly produced anteroventrally and has its ventromesal margin concave, and the distinctly formed and enlarged dorsolateral apodemes of the same segment. Characters supporting its placement in the Chimarrha fallax subgroup include the posteroventral projection of segment VIII. It is also possible that it belongs to a lineage basal to both of those subgroups. The rather simple tergum X, with an apicolateral cleft on each of its lateral lobes, is probably a primitive character; it may be ancestral to both subgroups, if the periphallic processes of the Chimarrha fallax subgroup had their origin as a cleft in each of the lateral lobes of tergum X.

Redescription.

Adult. Overall color (in alcohol) nearly uniformly yellowish brown. Head relatively short (postocular parietal sclerite ~ 1/2 diameter of eye). Palps relatively elongate; maxillary palp with 1st segment very short (approximately as long as wide), 2nd segment short (~ 3 × 1st), apex with small cluster of stiff setae, 3rd segment relatively elongate (nearly 2 × 2nd), 4th segment short (slightly shorter than 2nd), 5th segment elongate (nearly as long as 3rd and 4th combined). Forewing length: male, 6.2-7.0 mm; female, 6.5-7.5 mm. Fore- and hind wings with forks I, II, III, and V present. Forewing with R1 somewhat sinuous, stem of Rs weakly inflected at past midlength, without node at inflection, basal fork of discoidal cell not enlarged, fork nearly symmetric, length of cell ~ 2 × width, fork I slightly subsessile, fork II sessile, r crossvein diagonal, intersecting discoidal cell at past midlength, just before fork I, s and r-m crossveins linear, m crossvein very distinctly more proximal, s pigmented (like wing), r-m and m crossveins hyaline. 2A with crossvein (apparently forked apically to 1A and 3A). Hind wing with R1 narrowly parallel to subcosta, forks I and II strongly subsessile, fork III distal and relatively wide, anal loop small. Foreleg with apical tibial spur distinct; male with foretarsi unmodified, claws small and symmetrical.

Male genitalia. Segment VIII relatively short, sternum with short, posteriorly projecting, ventromesal projection, tergum slightly longer than sternum. Segment IX, in lateral view, with anterior margin distinctly produced and rounded in ventral ¼, dorsolaterally with prominent rounded apodemes, margin strongly convex between apodemes; tergum continuous dorsally, forming deep, narrow emargination mesally between apodemes; posterior margin broadly convex; posteroventral margin with elongate, narrow, posteriorly-projecting, ventral process, apex of process slightly expanded. Segment IX, in dorsal or ventral views, with anteroventral margin strongly concave. Lateral lobes of tergum X short, each partially divided from posterior margin into dorsal and ventral lobes, dorsal lobe with two sensilla in basal half; mesal lobe of tergum X very short, membranous. Preanal appendages short and rounded, somewhat flattened, constricted basally. Inferior appendage, in lateral view, elongate, projecting, widened and flared apically, distal margin subtruncate; appendage with prominent, sclerotized mesal cusp at approximately midlength, visible in lateral view as notch on ventral margin. Phallic apparatus with phallobase tubular, with usual basodorsal expansion, apicoventral margin only weakly projecting, endotheca with three spines, one relatively elongate, curved, and strongly sclerotized, other two relatively short, asymmetrically positioned; phallotremal sclerite complex composed of short rod and ring structure with small apical sclerite.

Distribution.

Ghana, Togo.

Figures

Figure 14. Chimarra togoana (Ulmer), ♂ genitalia A lateral B dorsal, segments IX and X C inferior appendage, ventral D inferior appendage, dorsal E phallus, lateral.