Petrothrincus pauliani, 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 : 16-17

Petrothrincus pauliani , new species

Figs 20–21 , 38–40 , 59

Described from a single male, this species is unique in the genus in having the anterior margin of abdominal segment IX sharply triangular, the superior appendages short, divided distally to form 3 distinct lobes, the phallic guides hooked distally, and the phallus with two pairs of sclerites in the form of stout spines.

Male head and thorax ( Figs 20–21 ). Antennal scape about 3x as long as wide. Maxillary palp ( Fig. 21 ) probably 5­segmented, 1st segment 2x longer than wide, 2nd about 1/ 3x the first, 3rd segment 1.5x longer than 2nd, (4th and 5th segments broken).

Interantennal setal warts situated close to each other. Cephalic setal warts not reniform, rather falciform ( Fig. 20 ), postocular setal warts long, vertical. Two pairs pronotal setal warts, median pair of warts slightly longer than lateral pair.

Male wings. Forewing length 4.8 mm, hind wing length 3.5 mm. Denuded wing membrane pale with pale helveus veins. Venation typical, except discoidal cell 2.3x longer than wide, subcosta and, particularly, radius on forewing and subcosta on hind wing strongly thickened. Pterostigmal area enlarged and well pigmented.

Male genitalia ( Figs 38–40 ). Anterior margin of abdominal segment IX sharply triangular, apex located dorsally; posterior margin shallowly concave, vertical, sternum directed posteroventrad in lateral aspect ( Fig. 38 ). Tergum posterior margin about straight in dorsal aspect ( Fig. 39 ). Superior appendages in form of short, broad plate in both lateral and dorsal aspects ( Figs 38, 39 ), with three finger­like lateral lobes directed downwards in lateral aspect ( Fig. 38 ), surfaces covered with small tubercles­like bases of long setae. Xth tergum slightly longer than superior appendage, widely triangular in dorsal view ( Fig. 39 ) and narrowly pointing posteriorly in lateral view ( Fig. 38 ); apical lobe reduced, bearing 1 pair of apical setae ( Fig. 39 ). Gonocoxite nearly rectangular in lateral view ( Fig. 38 ), at posterior apex bearing 2 small, pointed lobes, upper lobe 2x longer than lower lobe; ventral margin undulating; dorsal margin nearly straight; in ventral view ( Fig. 40 ) slightly sigmoid and posteriorly pointed. Phallic guide forms 1 pair of elongate rods, slightly bent posteriorly at midway, with short, downward apical hooks visible in both lateral and ventral aspects ( Figs 38, 40 ). Phallus about equally wide along its length in lateral aspect ( Fig. 38 ), slightly concave ventral margin; in dorsal view ( Fig. 39 ) widening posteriorly towards small, knob­shaped apex ( Fig. 39 ); with 2 pairs strong, spine­shaped internal sclerites, the lateral pair slightly shorter than median pair.

Etymology. This species is named after the collector, Prof. R. Paulian.

Holotype male: MADAGASCAR: Mt Tsaratanana, 1500 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 38 – 40. Petrothrincus pauliani, new species, holotype. Male genitalia: 38 — genitalia, lateral; 39 — genitalia, dorsal; 40 — genitalia, ventral.