Petrothrincus andohel, Johanson, Kjell Arne & Oláh, János, 2006

Johanson, Kjell Arne & Oláh, János, 2006, Eleven new species of Sericostomatoidea from Madagascar (Trichoptera: Helicopsychidae, Petrothrincidae, Sericostomatidae), Zootaxa 1205, pp. 1-30 : 18-19

Petrothrincus andohel , new species

Figs 22–24 , 41–43 , 59

This species is the only one having IXth sternum elongate and apparently articulated with the main body of the segment. The broad and multilobed distal margins of the superior appendages and gonocoxites are unique in the family.

Male head and thorax ( Figs 22–24 ). Antennal scape about 3x longer than wide. Maxillary palp 5­segmented and greatly shortened ( Figs 23, 24 ), 1st, 4th and 5th segments about equal in length, 2nd and 3rd about 1.5x and 2x longer than 1st, respectively. Labial palp almost as long as maxillary palp. Interantennal setal warts nearly tangential, cephalic setal warts reniform, postocular setal warts long, vertical. Pronotum with 2 pairs of setal warts, median pair about 2x wider and longer than lateral pair.

Male wings. Forewing length 5.0 mm, hind wing length 3.9 mm. Denuded wing membrane pale with pale flavous veins. Venation typical, except discoidal cell short, almost as long than wide. Subcosta and, particularly, radius on forewing and subcosta on hind wing strongly thickened. Pterostigmal area strongly enlarged and well pigmented.

Male genitalia ( Figs 41–43 ). Anterior margin of segment IX with a prominent rectangular anterior lobe, anterodorsal margin nearly right­angled concave, anteroventral margin shallowly concave; posterior margin uniformly and shallowly concave, with a small, blunt upper lobe in lateral aspect ( Fig. 41 ); IXth tergum slightly elongate posteriorly in lateral aspect ( Fig. 41 ). Main body of sternum short and parallel­sided in lateral view; with very long ventral process originating from and apparently articulated with posterior sternal apex, parallel­sided, slightly up­curving and apically rounded in lateral view ( Fig. 41 ), undulating and tapering in ventral view ( Fig. 43 ). Superior appendages form broad plates both in lateral and dorsal aspect, with 4–5 small distal ‘lobes’, the enlarged setal protuberances that are united anteromedially in a common base. Xth tergum about 2x longer than superior appendages; in lateral view dorsal margin slightly concave, ventral margin strongly convex at midway, tapered to apex ( Fig. 41 ); in dorsal view ( Fig. 42 ) long, ellipsoid, with short apical lobe bearing 1 pair of short apical setae. Gonocoxite oriented dorsally, with convex anterodorsal and ventral margins; sharply undulating posterior margin ( Fig. 41 ) forming 3 pairs of bifid lobes. Phallic guide forms two elongate rods ( Fig. 41 ). Phallus broad, nearly straight, forming a parallel­sided tube along its whole length, with phallic sclerites in form of 2 long and 6 shorter stout spines visible in lateral aspect ( Fig. 41 ).

Etymology. This species is named after the local name of the type locality. Holotype male: MADAGASCAR: Andohahela, 1800 m [R. Paulian].

Figures

FIGURE 59. Map of Madagascar showing distributions of Petrothrincus spp. (Petrothrincidae): P. newidop, P. pauliani and P. tsaratananensis (circle); P. dhritaparam (rectangle); P. andring (diamond); P. scottae, P. weaveri, P. s t e i n e r i, P. acuta and P. concava (cross); and P. andohel and P. tsaratananensis (triangle).

FIGURES 17 – 27. Petrothrincus spp. Male head and thorax: 17 – 19. Petrothrincus tsaratananensis, new species, holotype. 17 — head and thorax, dorsal; 18 — maxillary palp; 19 — labial palp. 20 – 21. Petrothrincus pauliani, new species, holotype. 20 — head and thorax, dorsal; 21 — maxillary palp (broken). 22 – 24. Petrothrincus andohel, new species, holotype. 22 — head and thorax; 23 — maxillary palp lateral; 24 — maxillary palp, dorsal. 25 – 27. Petrothrincus andring, new species, holotype. 25 — head and thorax, dorsal; 26 — maxillary palp, dorsal; 27 — maxillary palp, lateral.

FIGURES 41 – 43. Petrothrincus pauliani, new species, holotype. Male genitalia: 41 — genitalia, lateral; 42 — genitalia, dorsal; 43 — genitalia, ventral.