Metrichia brocha 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 : 3-4

Metrichia brocha Thomson and Armitage , sp. n.

Fig. 4 .

Diagnosis. Metrichia brocha is most similar to M. spica Bueno-Soria and Holzenthal. In both species, the inferior appendage is suborbicular in lateral view, with 2 processes along the ventral margin. However, the anterior process is truncate in M. spica ( Bueno-Soria and Holzenthal 2003) and pointed in M. brocha . Additionally, the emargination between the 2 processes is larger in M. spica than in M. brocha .

Male. Forewing length 2.5–2.7 mm (n = 7). 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 Segment IX anterolateral margin convex, narrowing and withdrawn into segments VII–VIII, posterolateral margin convex; dorsally with posterior margin membranous, flat. Preanal appendage short, rounded. Dorsolateral hook slender, decurved. Inferior appendage setose, suborbicular with small anteroventral pointed process and large, heavily sclerotized mesoventral pointed process; ventrally, large pointed process curved inward. Tergum X membranous, amorphous. Phallus widest at base, narrowing to median constriction, membranous apex with 3 spines, 1st and 2nd curved strongly outwards, 3rd slender, elongate, extending 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, 14.iv.2015, J. Dietrich and B. Armitage ( COZEM) . Paratypes —ibid., 18–23.v.2015, 5 males ( BJA) ; ibid., 30–31. viii.2015, 1 male ( COZEM) .

Etymology. The Latin word brochus meaning “with projecting teeth”, referring to the 2 pointed processes

of the ventral margin of the inferior appendage.

Figures

Figure 4. Metrichia brocha sp. n., male genitalia. A) Segments VII–X, lateral (base of phallus crosshatched). B) Segments IX–X, dorsal. C) Segment IX, ventral. D) Phallus, lateral. E) Phallus, dorsal.