Metrichia calla 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 : 4

Metrichia calla Thomson and Armitage , sp. n.

Fig. 5 .

Diagnosis. Metrichia calla is most similar to M. sesquipedalis Bueno-Soria and Holzenthal. Both species bear a large inferior appendage truncate basally, extended and accuminate apically. In ventral view, the broad base of the inferior appendage narrows gradually to the slender apex in M. sesquipedalis ( Bueno-Soria and Holzenthal 2003) , but does so very abruptly in M. calla .

Male. Forewing length 2.7 mm (n = 1). Head unmodified, with 3 ocelli; antennae unmodified. Tibial spur count 1, 3, 4. Color in alcohol brown, denuded. Genitalia. Abdominal sternum VII without mesoventral process. Segment VIII unmodified. Segment IX anterolateral margin convex, narrowing and withdrawn into segments VII–VIII, posterolateral margin convex, with small apicoventral process; dorsally, with posterior margin membranous, flat. Preanal appendage short, rounded; dorsally with posterior margin rugose. Dorsolateral hook stout, decurved. Inferior appendage interior surface bearing row of peglike setae, truncate basally, apex elongate and extended in narrow, triangular process. Tergum X membranous, apex subquadrate in dorsal view. Phallus widest at base, membranous apex with 3 spines, 1st and 2nd spiraling outward, 3rd slender, elongate, extending apically within membranous sheath.

Type material. Holotype male— PANAMA: Chiriquí Province: Cuenca 102 (Río Chiriquí Viejo ), Quebrada Norte , Mount Totumas Biological Reserve , 8.873613°N, 82.690512°W, UV-light trap, 18.iii.2016, B. and T. Armitage ( COZEM).

Etymology. Calla, referring to the shape of membranous apex of the phallus, which reminds the authors of a calla lily.

Genus Neotrichia Morton. Fourteen species in the genus Neotrichia were previously known for Panama, seven of which were described in Panama and are currently endemic. Herein we add one new species from Mount Totumas.

Figures

Figure 5. Metrichia calla sp. n., male genitalia. A) Segments IX–X, lateral (base of phallus crosshatched). B) Segments IX–X, dorsal. C) Segment IX, ventral. D) Phallus, lateral. E) Phallus, dorsal.