Petrothrincus newidop, 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 : 13-15

Petrothrincus newidop , new species

Figs 32–34 , 59

The genitalia of this new species resemble those of P. steineri , P. scottae , P. tsaratananensis and P. andring in the tripartite division of the gonocoxite. P. newidop is separated by the basally higher and knife­shaped Xth tergum, the phallic guide divided into 2 pairs of rod­shaped plates, the up­turned apex of the gonocoxal median lobe, and the dorsal, tongue­shaped expansion of the IXth tergum. In scottae the phallus also has 1 pair of long phallic sclerites but has shorter expansion of the IXth tergum, short and thick ventral phallic guide, slightly down­turned median branch of gonocoxite, and more slender Xth tergum. The length ratios of the segments of the maxillary palp also differ from other similar species.

Male head and thorax. Antennal scape about 3x as long as wide. Maxillary palp 5­ segmented, 1st segment 4x longer than wide, 2nd segment about 1/ 3x the length of 1st, 3rd segment shortest, only 1/4 as long as first, 4th and 5th segments as long as 1st. The 3­ segmented labial palp almost as long as maxillary palp. Interantennal warts close to each others, cephalic setal warts reniform, postocular.

Male wings. Forewing length 5.0 mm, hind wing length 3.8 mm. Denuded wing membrane pale flavous with pale helveus veins. Venation typical except discoidal cell 1.7x 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 32–34 ). Anterior margin of abdominal segment IX ellipsoid, almost semicircular, anterodorsal margin shallowly concave, anteroventral margin deeply concave ventrally, posterior margin with rounded triangular upper lobe in lateral aspect ( Fig. 32 ). Tergum IX strongly produced backwards into a wide semicircular lobe ( Fig. 33 ). Sternum short and clavate ( Figs 32, 34 ). Superior appendage digitate with produced setal tubercles, slightly curved ventrally. Tergum X as long as superior appendage, curving dorsally and strongly tapering along its length ( Fig. 32 ); in dorsal view ( Fig. 33 ) wide along its length, except slightly narrowing towards apical lobe; apical lobe minute, apically undivided, with 1 pair setae. Gonocoxite basally wide, distal half divided into 3 lobes ( Fig. 32 ); dorsal lobe short, slightly oriented ventrally, median lobe long, up­turned at apex, ventral lobe straight, tapering, with undulating ventral margin ( Fig. 32 ). Phallic guide composed of 2 pairs equally long, elongate rods ( Figs 32, 34 ), upper pair wider than ventral pair, slightly curving laterally toward apex ( Fig. 34 ), ventral pair posteriorly narrower than upper pair ( Fig. 34 ). Phallus broad along its length, slightly bent ventrally at ¾ its length, with 1 pair of spines nearly as long as phallus ( Fig 32 ).

Etymology. This new species is named for the first impression upon discovery of its identity as a Petrothrincus . In Sanscrit, “newidopa” means identical.

Holotype male: MADAGASCAR: Mt Tsaratanana, 500 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 32 – 34. Petrothrincus newidop, new species, holotype. Male genitalia: 32 — genitalia, lateral; 33 — genitalia, dorsal; 34 — genitalia, ventral.