Costatrichia devestiva Thomson and Armitage, 2018

Thomson, Robin E. & Armitage, Brian J., 2018, The Trichoptera of Panama. VI. Seven new species of microcaddisflies (Insecta: Trichoptera: Hydroptilidae) from Mount Totumas Cloud Forest and Biological Reserve, Insecta Mundi 613, pp. 1-15 : 2

Costatrichia devestiva Thomson and Armitage , sp. n.

Fig. 2 .

Diagnosis. Costatrichia devestiva is unique from all other species in the genus due to the apparent lack of spines or sclerites on the phallus. The membranous apex seems to bear only a small pair of completely membranous lateral lobes.

Male. Forewing length 2.5–2.7 mm (n = 5). Head unmodified, with 3 ocelli; antennae unmodified. Tibial spur count 1, 3, 4. Color in alcohol brown, denuded. Genitalia. Abdominal sternum VII with simple, pointed mesoventral process. Sternum VIII anterolateral margin with 1 digitate lateral process bearing large, stout spine, 1 slender, elongate spinelike lateral process, and peglike setae apicoventrally; in ventral view posterior margin with mesal emargination between patches of peglike setae, spinelike lateral process with single basal peglike seta and small basal digitate process bearing single seta. Segment IX anterolateral margin convex, posterolateral margin straight, with posterolateral process bearing 2 small apical setae; in dorsal view anterior margin pointedly concave, posterior margin nearly straight. Inferior appendage with rounded basal emargination and apical hook curving ventrad; in ventral view fused basally, with shallow apical emargination. Tergum X with dorsal sclerite subovate; ventral sclerite semielliptic with rounded mesal production on anterior margin; membranous apex rounded in dorsal view. Phallus tubular basally, constricted at midlength with median complex bearing basal loop and pair of spherical dorsal “windows”; apex large, membranous, with pair of mesolateral membranous lobes, strongly recurved apically.

Type material. Holotype male— PANAMA: Chiriquí Province: Cuenca 102 (Río Chiriquí Viejo ), Quebrada Norte , Mount Totumas Biological Reserve , 8.873613°N, 82.690512°W, Malaise trap, 30–31. viii.2015, J. Dietrich and B. Armitage ( COZEM) . Paratypes —ibid., 3 males ( BJA) ; ibid., 26.iv–10.v.2015, 1 male ( COZEM) .

Etymology. The Latin word devestivus meaning “undressed”, referring to the lack of spines or sclerites on the phallus typically present in this genus.

Figures

Figure 2. Costatrichia devestiva sp. n., male genitalia. A) Segments VIII–X, and segment VII mesoventral process, lateral (base of phallus crosshatched). B) Segments IX–X, dorsal. C) Segments VIII–IX and segment VII mesoventral process, ventral. D) Phallus, lateral phallus, dorsal.