Chimarra chichewa, Wahlberg & Espeland & Johanson, 2014

Wahlberg, Emma, Espeland, Marianne & Johanson, Kjell Arne, 2014, Seven new species of Chimarra (Trichoptera: Philopotamidae) from Malawi, Zootaxa 3796 (3), pp. 579-593 : 586-588

Chimarra chichewa , new species

( Figs 9 , 26–32 )

Diagnosis. The male of this species is unique in having genitalia with a large vertical distance between the mesal and lateral lobes of tergum X; inferior appendages are short and partly heavily sclerotized, in lateral view they are triangular with very sharp dorsal projection; and phallic endothecal spines are absent. The lobes of tergum X and the posteroventral process resemble those of C. tamsi Mosely 1936 , São Tomé Island, from which it is distinguished by the less sclerotized lobes of tergum X, longer ventral process of sternum IX, and more nearly triangular inferior appendages with only a short dorsal process in C. chichewa . Chimarra chichewa also has a darkly sclerotized dorsal tooth on each lateral lobe of tergum X; this tooth is obscure in C. tamsi .

Description, male: Colour (in alcohol): Head yellow; eyes black, margins of ocelli black; setal warts pale; antennae brown; thorax yellow, thoracic warts pale; forewings light brown, hind wings slightly paler than forewings; tarsi and tibial spurs brown; abdomen yellowish. Forewings each 6.0 mm (n=1), length over width ratio 2.9; hyaline spots distributed as in Fig. 9 ; discoidal cell short, 2x longer than wide, originating shortly before mid length of wing; median cell as long as discoidal cell; fork I originating distally of cross-vein r at distance equal to length of cross-vein r; nygma at base of fork II. Fork III with ratio of length over breadth 3.4. Hind wing each 4.5 mm (n=1); length over width ratio of 2.5; anterior margin slightly curved.

Genitalia: Segment IX produced posteriorly on each side into posteroventral and dorsomesal processes; posteroventral process darkly sclerotized at base, originating from invagination of sternum IX, elongate, of uniform thickness, slightly curved with blunt end; dorsomesal process of segment IX triangular, apically blunt, partly covering segment X. Preanal appendages setose, elongate in lateral view, cone-shaped in dorsal view, dorsally partly covered by segment IX. Tergum X divided into pair of mesal lobes and pair of lateral lobes; mesal lobes of tergum X displaced ventrally and situated between inferior appendages, each narrow, elongate and with spatulashaped apex; lateral lobes each wide, with dorsal sclerotized, sharp tooth; apex blunt in lateral view; outer margins sclerotized at mid length and bulbous posteriorly in dorsal view. Inferior appendages each quadrate in lateral view, with apicodorsal acute projection directed mesad in dorsal view and posterodorsad in lateral view, especially darkly pigmented in distal 3/4ths, fringed with few setae along posterior margin. Phallic apparatus sinuous in lateral view, without visible spines; anteriorly angled ventrad; posteriorly with blunt membranous apex.

Male holotype: Malawi: Mulanje: Ruo River below power station, S15.97188° E35.65463°, 870 m, light trap, 12 November 2012, Loc # Ma 40a, leg. M. Espeland, S. Dupont and R. Murphy ( Fig. 1 , locality #3) .

Paratypes: Same data as holotype: 1 female . Same data as holotype, except 9 November 2012, Loc# Ma40: 1 female .

Etymology. Chichewa, named after the national language of Malawi.

Figures

FIGURE 1. Map of Malawi showing locations of collection. Basemap provided by Esri et al. (2013).

FIGURES 7–13. Right wing, dorsal. 7—C. zombaensis, new species, holotype; 8—C. flaviseta, new species, holotype; 9—C. chichewa, new species, holotype; 10—C. circumverta, new species, holotype; 11—C. mulanjae, new species, holotype; 12—C. psittacus, new species, holotype; 13—C. calidopectoris, new species, holotype.

FIGURES 26–38. Chimarra new species, male genitalia. 26–32, Chimarra chichewa, new species, holotype: 26—genitalia, left lateral; 27—left inferior appendage, left lateral; 28—genitalia, dorsal; 29 –phallic apparatus, left lateral; 30—phallic apparatus, dorsal; 31—right inferior appendage, dorsal; 32—right inferior appendage, ventral. 33–38, Chimarra circumverta, new species, holotype: 33—genitalia, left lateral; 34—phallic apparatus, left lateral; 35—phallic apparatus, dorsal; 36—genitalia, dorsal; 37—right inferior appendage, dorsal; 38—right inferior appendage, ventral.