Chimarra mayottensis, Johanson, Kjell Arne & Mary, Nathalie, 2009

Johanson, Kjell Arne & Mary, Nathalie, 2009, Description of three new caddisfly species from Mayotte Island, Comoros Archipelago (Insecta: Trichoptera), Zootaxa 2089, pp. 1-9 : 4-6

Chimarra mayottensis , new species

Figs. 5–8

Diagnosis. This species is distinguished from other Afrotropical species of Chimarra in possessing an exceptionally large phallus; a broad and anteriorly produced sternite IX; a small setose lobe below mid-height of the posterior margin of segment IX; and segment X with large ventrolateral lobes, each having a lateral hook; and a small triangular, strongly sclerotized process at the posteroventral margin of each inferior appendage. The shape of the inferior appendages of the new species resembles that of C. crocifera Morse, 1974 , and C. pondoensis ( Barnard, 1941) , from South Africa; C. krugeri ( Jacquemart, 1962) , from South Africa and Zimbabwe; C. falcifera Jacquemart, 1966 , and C. trispina ( Jacquemart, 1961) , from the Democratic Republic of Congo; and C. zoria ( Mosely, 1939) , from the Ruwenzori Mountains in Uganda. All these species lack the process on their posteroventral margin of each inferior appendage.

Description. Male genitalia: Lateral portions of sternum IX strongly produced anterad, ( Fig. 5 ); lateral margin, above these productions semicircularly incised; their anteroventral corners nearly right-angled; dorsal apodeme long, directed anterad, narrowly triangular in lateral view ( Fig. 5 ). Posterior margin of segment IX with rounded, setose process located immediately below mid-height on each side ( Fig. 5 ); sternite, in ventral view ( Fig. 7 ), with anterior margin shallowly and widely incised; anteromedian margins, in dorsal view ( Fig. 6 ), forming narrow U-shaped excavation. Segment X incompletely developed, composed of short dorsal lobe and pair of large ventral lobes ( Figs. 5–6 ); ventral lobes tapering from midway in lateral view ( Fig. 5 ); proximally membranous, distally slightly sclerotized, in dorsal view ( Fig. 6 ) forming pair of posteriorly oriented processes, each with rounded apex and lateral, subapical hook, processes less sclerotized beyond these hooks. Preanal appendages setose, originating from membranous part of segment X, bean-shaped in lateral view ( Fig. 5 ), cylindrical in dorsal view ( Fig. 6 ). Inferior appendages slender, curving dorsad along their lengths, densely covered by small setae; each with short, strongly sclerotized triangular process at posteroventral margin immediately after midlength; tapering from midlength, apices strongly curving mesad ( Figs. 6–7 ). Phallus, in lateral view ( Fig. 8 ), very large, nearly two times longer than rest of genitalia; phallobase rounded anteriorly; dorsal margin nearly straight; phallobase produced posterad ventrally, height equal to height of rest of genitalia; posteroventral part of phallobase produced into ventral spine directed posterad; endotheca with pair of dark endothecal spines about as long as apical spine of phallobase.

Holotype (pharate male): MAYOTTE: Koualé river, affluent forêt 2 (DAF-20), 12°47’42.65’’, 45°09’58.93’’E, 220 m, 18.v.2006. Abdomen in slide mounted in Euparal, rest of body in alcohol ( MNHN).

Paratypes: Same data as holotype — 1 pharate male, 5 pupae (in alcohol, NRM); MAYOTTE: Longoni, Mro oua Longoni (DAF-01), 12°44’21.12’’S, 45°09’54.97’’E, 25 m, 14 June 2006 — 1 pharate male (in alcohol, NRM).

Distribution. Comoros Archipelago.

Etymology. Mayottensis , named after the type locality, Mayotte Island.

Figures

FIGURES 5 – 8. Chimarra mayottensis, new species. Pharate male holotype: 5 — genitalia, left lateral view; 6 — genitalia, dorsal; 7 — genitalia, ventral; 8 — phallus, left lateral.