Chimarra flaviseta, 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 : 583-586

Chimarra flaviseta , new species

( Figs 3 , 8 , 20–25 )

Diagnosis. The male of this species is similar to that of C. zombaensis , new species, by the presence of two long anterior endothecal spines and a single apical endothecal spine in the phallus. It can be distinguished from C. zombaensis by the presence of tufts of yellow setae on the head and thorax of C. flaviseta (such hairs are absent from C. zombaensis , Fig. 2 ). In the genitalia, the phallus also resembles that of C. somereni , with a pair of long anterior phallic spines and a single, shorter and more evenly curved phallic spine apically, differing in this respect from C. zombaensis in that the apical spine of C. flaviseta and C. somereni is without an acute angular hook apically. Chimarra flaviseta is distinguished from C. somereni also by the inferior appendages each having a more prominent rectangular mesobasal process (with two short triangular mesobasal processes on each inferior appendage of C. somereni ). Chimarra uvirana also has an evenly curved apical endothecal spine but the anterior endothecal spines are shorter in that species. Unlike other species, the phallus of C. flaviseta has an apicoventral spatulate process and each inferior appendage has a dorsally curving and pointed process at its apex.

Description, male: Colour (in alcohol): Head brown with tufts of yellow setae; eyes black, margins of ocelli black; warts pale brown; thorax brown with tufts of yellow setae; warts pale brown. Wings dark brown. Abdomen brown. Forewings each 6.0 mm (n=1), length over width ratio 3.6; pale hyaline spots distributed as in Fig. 8 ; posterior branch of Cu1b extending slightly inward toward origin of fork V; discoidal cell 3.8 times longer than wide, originating shortly before mid length of wing; median cell 2/3rds length of discoidal cell; fork I originating after cross-vein r at distance of 1.5 times length of cross-vein r; nygma situated at base of fork II. Fork III 4.8 times longer than its width. Hind wings each 5.0 mm (n=1), elongate, length over width ratio 3.0; anterior margin curved.

Genitalia: Segment IX with pair of posterodorsal processes and pair of posteroventral processes; posterodorsal processes triangular in lateral view, situated immediate below preanal appendages, each with darkly sclerotized and setose apex; posteroventral processes prominent, subtriangular in lateral view. Preanal appendages each situated at mid height of base of tergum X; setose, small, bean-shaped in lateral view, directed caudad. Tergum X horizontal, directed posterad; divided into lateral and mesal lobes fused up to 3/4ths of their length in dorsal view; apex of each mesal lobe hidden behind its lateral lobe in lateral view, narrowly rounded in dorsal view; apex of each lateral lobe sharply triangular and attenuated, needle-like in lateral and dorsal views, each with barb-like lateral process at mid length of segment. Inferior appendages each with narrow base, sigmoid, apex with long posterior process curved dorsad; dorsal margin strongly sclerotized; scattered setae mainly on distal half laterally; in ventral and dorsal views with lateral margin strongly convex and apical process directed posterad to form L-shape with inner apex; setose inner process square. Phallic apparatus with pair of very long and basally broad, anterior endothecal spines, straight in ventral view, curving ventrad in lateral view; posterior apical endothecal spine about half as long as anterior spines, arising apicodorsally and evenly curving about 60° dorsad and anterad from mid length; endothecal sclerites present; heart-shaped in ventral view with slender and sinuous anterior processes, slightly curving ventrad into ventrally protruding spatulate process apically.

Male holotype: Malawi: Nyika: Juniper forest , S10.75127°, E33.88754°, 2240 m, light trap, 21–23 October 2012, Loc # Ma 18, leg. M. Espeland, S. Dupont and R. Murphy ( Fig. 1 , locality #2) .

Paratypes: Same data as holotype: 1 male, 3 females .

Etymology. Flaviseta, from Latin flavi, yellow, and seta, bristle, referring to the yellow tufts of setae on the head and thorax.

Figures

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

FIGURES 2–5. Heads, dorsal. 2—C. zombaensis, new species, holotype; 3—C. flaviseta, new species, holotype; 4—C. psittaca, new species, holotype; 5—C. calidapectoris, new species, holotype.

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 14–25. Chimarra new species, male genitalia. 14–19, Chimarra zombaensis, new species, holotype: 14—genitalia, left lateral; 15—phallic apparatus, left lateral; 16—phallic apparatus, dorsal; 17—genitalia, dorsal; 18—right inferior appendage, dorsal; 19—right inferior appendage, ventral. 20–25, Chimarra flaviseta, new species, holotype: 20—genitalia, left lateral; 21—phallic apparatus, left lateral; 22—phallic apparatus, dorsal; 23—genitalia, dorsal; 24—right inferior appendage, dorsal; 25—right inferior appendage, ventral.