Tinodes forcipatus, Gibon, 2017

Gibon, François-Marie, 2017, New species of Tinodes from Madagascar (Trichoptera, Psychomyiidae), Zootaxa 4318 (2), pp. 364-376 : 370-372

Tinodes forcipatus n. sp.

Figs 4 A–4C

Diagnosis. Tinodes forcipatus n. sp. is closely related to Tinodes marcossi n. sp. The two species can be distinguished by the shape of the intermediate appendage branches. These appendages are almost symmetrical in T. forcipatus n. sp., but they are conspicuously asymmetrical in T. marcossi n. sp. Moreover, the medio-dorsal spines of these appendages are longer than the appendages themselves in T. forcipatus n. sp., but in T. marcossi n. sp. they are shorter than the right one and slightly longer than the left one. The apical spine is longer in T. forcipatus . Although not so apparent, other differences can be observed: the long internal sclerite of the phallic apparatus is stouter and more sclerotized in T. marcossi n. sp. and the dorsal branch of the second segment of each inferior appendage is somewhat more developed. These two species are also related to Tinodes irwini Johanson & Oláh 2007 , which is distinguishable by the accentuated curvature (Z-shape) of the intermediate appendage branches and a shorter internal sclerite in T. irwini .

Description. General color pale brown, dorsal sclerites slightly darker, wings brown with few small hyaline areas (in alcohol). Length of each forewing 3.1–3.2 mm (n = 4); length of each hind wing 2.5–2.6 mm (n = 4). Forewing forks 2, 3, 4, and 5; crossveins r (R1-R2+3), rs (R4+5-M1+2), and cu (Cu1-Cu2); and hyaline line along stem of M present. Hind wing forks 2, 3, and 5 and crossveins r (R1-R2+3) and r-m (R4+5-M1+2) present.

Male genitalia ( Figs 4 A–4C): Sternite IX strongly produced posterad ventrally, posterior margin deeply concave and anterior margin almost straight in lateral view; trapezoidal with anterior part almost 2 times broader than posterior part in ventral view; setae present along ventrolateral part of posterior margin. Tergite IX relatively short, stalk straight, thin basally, slightly widening distally, posterior part of tergum IX two times as long as stalk, triangular when viewed laterally and dorsally and without setae. Tergite X indistinct. Preanal appendages elongate (longer than intermediate appendage branches and as long as phallic apparatus), slightly broadened in middle and sigmoid in lateral view, almost straight in dorsal view; setae present from about one fourth its length. Base of intermediate appendage forming hoop above base of phallic apparatus, extended distally in two almost symmetrical branches (right branch slightly longer, identical in shape), each branch composed of anterior part directed distad and more slender posterior part directed ventro-distad and with upcurved apex; junction of these parts slightly protruding dorsally and each bearing two very long spines (longer than posterior part), apex of each posterior part bearing short, stout dorsal spine directed upwards. Phallic guide apodeme of inferior appendages directed anterad, rather short, of equal thickness in lateral view, narrowing and pointed in ventral view; basal plate visible as rounded protrusion between first segments of inferior appendages in ventral view. Phallic guides long, spear-shaped, straight (not curved dorsad), acute tips pointed posterolaterad. Inferior appendages two-segmented: First segment larger than second, almost 2 times as long as tall; anterior, posterior, and ventral edges slightly concave, dorsal edge slightly convex; in ventral view lateral margins rounded, posterior margins deeply incised, inner edges almost straight; ventral and distal parts with long, dense setae. Second segment smaller than first, composed of two fingerlike branches bearing few setae; short dorsal branch bent mesad, longer ventral one bent mesoventrad. Phallic apparatus long, apically extended ventrad; one long and straight internal sclerite with wide base, gradually narrowing to apex.

Holotype: Male. MADAGASCAR: Fianarantsoa Prov., brooklet 1.5 km NW Andrambovato , 21°30′07′′S, 47°24′57′′E, 970 m a.s.l., 5.ii.2000, swept along brooklet with small waterfalls in rain forest, P. Chvojka leg. ( NMPC).

Paratypes: 2 males, same data as holotype.

Additional material examined: 1 female, same data (an unassociated female collected with males).

Etymology. Latin noun “ forceps ” and adjectival suffix “- atus, - a, - um,” meaning “provided with pincers, nippers, tongs, or tweezers”; referring to the shape of the second segment of each inferior appendage (ventral view).

Distribution. MADAGASCAR: Endemic. Recorded only from the type locality ( Fig. 7 ).

Figures

FIGURE 4. Tinodes forcipatus n. sp., male genitalia: 4 A, left lateral; 4 B, dorsal, without inferior appendages; 4 C, segment IX and inferior appendages, ventral. Abbreviations: d. b. = dorsal branch of second segment of inferior appendage; g. = phallic guide; v. b. = ventral branch of second segment of inferior appendage. Scale bar: 0.25 mm.

FIGURE 7. Schematic distribution maps of the Malagasy Tinodes.