Chimarra mgwashi, 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

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Chimarra mgwashi

sp. nov.

Chimarra mgwashi sp. nov.

Fig. 52A-E View Figure 52

Type material.

Holotype. Tanzania - Tanga Reg. ● ♂ (in alcohol); West Usambara Mts, Mgwashi, Shokoi River; 4°46'S, 38°29'E; 24 Nov. 1990; T Andersen leg.; sweep net; UMSP 000550054.


Chimarra mgwashi sp. nov. is most similar to C. aciculata Morse and C. evoluta Kimmins, particularly in the general shape of segment IX and inferior appendages. Diagnostic differences from C. aciculata include the overall shape of the inferior appendage, in lateral view, which in C. mgwashi has its dorsal process more basal and not hooked or curved mesally, and the shape of the phallobase, which, in C. mgwashi , is very short and obscured by the strongly sclerotized lateral projections of the phallocrypt. The most useful diagnostic feature separating C. mgwashi from C. evoluta is the shape of the apex of the inferior appendage in ventral view, which is subtruncate in C. mgwashi , but narrowed and mesally hooked in C. evoluta .


Adult. Overall color (in alcohol) dark brown. Head short (postocular parietal sclerite short, <1/2 diameter of eye). Palps elongate, maxillary palp with 1st segment very short (slightly longer than wide), 2nd segment moderate (~ 2 × 1st), apex with cluster of ~ 8-10 stiff setae, 3rd segment elongate (~ 1½ × 2nd), 4th segment short (~ 1/2 length of 3rd), 5th segment very elongate and narrow (subequal to 3rd and 4th combined). Forewing length: male, 5.2 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 in middle, basal fork of discoidal cell enlarged, evenly forked, length of cell ~ 2½ × 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 slightly subsessile, anal loop small. Forelegs with apical tibial spur short; male with foretarsi modified, tarsal claws enlarged and asymmetrically developed.

Male genitalia. Segment VIII short, sternum without posteroventral projection. Segment IX, in lateral view, very short, with anterior margin nearly straight, without dorsolateral apodemes, posterior margin somewhat expanded at attachment point of inferior appendages; dorsal margin with paired, elongate, narrow, scabrous, posteroventrally directed processes from anterolateral margin, apices of processes acute; ventral process of segment from ventral margin, very small, rounded, ventrally directed; as viewed dorsally, with tergum discontinuous mesally, posterior processes widely separated basally. Tergum X with relatively short membranous mesal lobe, divided mesally, lateral lobes, as viewed laterally, with dorsal margin more sclerotized, forming two rounded projections, the more distal one with two sensilla. Preanal appendages rounded, mound-like, fused basally. Inferior appendage, as viewed laterally, moderately elongate, narrowing apically, with short, tapering, basodorsal expansion; as viewed dorsally, without cusp or tooth on mesal margin, apex truncate. Phallic apparatus with phallobase very short, with usual basodorsal expansion, well anchored within segment by sclerotized periphallic membrane (attached to lateral margin of segment IX), appearing as sclerotized lateral wings, ventral apex of phallobase not projecting, continuous with endotheca; endotheca membranous, with slightly sclerotized dorsal lobe, phallic spines apparently absent; phallotremal sclerite complex composed of short, rather indistinct, rod and ring structure.


Chimarra mgwashi , used as a noun in apposition, and named for the site in Tanzania where the holotype specimen was collected.