Chimarra elga Mosely, 1939

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 elga Mosely, 1939

Fig. 9A-D

Chimarrha elga Mosely, 1939: 300-301, figs 20-23.

Chimarra elga Mosely: Fischer 1971: 209.

Material examined.

Democratic Republic Of The Congo ● 3♂♂; South Kivu, CRSN Lwiro, Kabindi, Guest House , Site 3; 2°14.270'S, 28°42.907'E; 1.668 m a.s.l.; 27 Sept. 2005; UMSP ● 1♂; same collection data as for preceding except 19 Apr. 2006; UMSP .

Diagnosis.

Chimarra elga is another species in the Chimarrha fallax subgroup belonging to the complex of species with spine-like dorsolateral lobes of tergum X and a phallobase with a projecting and deflexed ventral apex. Among these, C. elga is easily diagnosed by the relatively short, flexed dorsal process of its inferior appendage. It is included in the current paper mostly for comparative purposes.

Redescription.

Adult. Overall color (in alcohol) yellowish brown, vertex of head darker than setal warts. Head relatively short (postocular parietal sclerite <1/2 diameter of eye). Palps moderately elongate; maxillary palp with 1st segment very short (approximately as long as wide), 2nd segment moderately elongate (~ 3 × 1st), apex with small cluster of stiff setae, 3rd segment slightly longer than 2nd, 4th segment short (~ 1/2 length of 3rd), 5th segment subequal to 3rd. Forewing length: male, 5.7-6.6 mm. Fore- and hind wings with forks I, II, III, and V present. Forewing with R1 slightly sinuous, stem of Rs inflected at past midlength (with distinct node at inflection, not extending into cell below), basal fork of discoidal cell enlarged, slightly asymmetric, length of cell ~ 2 1/2 × width, fork I distinctly 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 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 subsessile, fork III relatively distal, anal loop small. Forelegs with tibial spur distinct; male with foretarsi unmodified, claws small and symmetrical.

Male genitalia. Segment VIII with sternum relatively short, ventrally with distinct ventral projection, tergum somewhat wider, expanded dorsally. Segment IX, in lateral view, with anteroventral margin moderately produced, anterior margin with rounded projection at approximately ventral ¼, concavely narrowing dorsally; tergum short dorsolaterally, with prominent anterior apodemes, obsolete mesally between apodemes; posterior margin widening below preanal appendages, nearly linear to ventral margin; ventral margin, with elongate, narrow ventral process, apex of process acute as viewed laterally, rounded as viewed ventrally, apicoventral surface of ventral process roughened and file-like; anterior margin of sternum subtruncate as viewed dorsally or ventrally, not or only slightly concave mesally. Lateral lobes of tergum X formed into dorsally curved, sclerotized, spine-like processes, bearing two preapical sensilla; dorsum of mesal lobe of tergum X moderately elongate, membranous; tergum ventrally with strongly projecting, paired, sclerotized, periphallic processes, subtending phallic apparatus. Preanal appendages short and knob-like, constricted basally. Inferior appendage with pronounced basal inflection, apex dorsally inflected, apex of inflection relatively short and strongly narrowed, distinctly posteriorly curved, apex acute; as viewed ventrally, with distinct sclerotized projections near base and before midlength, evident in ventral view, basal projection not evident in lateral view; base very strongly rounded and relatively short; mesal surface without projections or ridges. Phallic apparatus with phallobase tubular, with usual basodorsal expansion, apicoventral margin sclerotized, strongly deflexed and projecting, apex slight enlarged and rounded; endotheca with two moderately elongate, asymmetrically positioned spines, membrane textured with small spines, phallotremal sclerite complex composed of short rod and ring structure and small apical sclerite.

Distribution.

Democratic Republic of the Congo, Kenya.

Figures

Figure 9. Chimarra elga Mosely, ♂ genitalia A lateral B dorsal, segments IX and X C inferior appendage, ventral / caudal D phallus, lateral.