Metrichia corazones Armitage and Harris, 2020

Armitage, Brian J. & Harris, Steven C., 2020, The Trichoptera of Panama XIV. New species of microcaddisflies (Trichoptera: Hydroptilidae) from Omar Torrijos Herrera National Park, Insecta Mundi 763, pp. 1-19 : 4-5

Metrichia corazones Armitage and Harris , new species

Fig. 7 , 8

Diagnosis. Metrichia corazones appears to be most closely related to M. helenae Flint and Bueno on the basis of the lack of abdominal pouches, the quadrate inferior appendages, and the pair of subapical phallic spines. It differs from this species in the inferior appendages being more rectanguloid, the phallic spines being dissimilar in length, and the phallus having a median process. The new species has enlarged, flattened antennae ( Fig. 8H ) and darkened foreleg tibia, with a row of stout setae ( Fig. 8F ).

Description. Length 1.3–1.5 mm, 19 antennal segments, basal segments flattened and dilated, foreleg with tibia darkened and bearing row of stout setae, overall color brown (in alcohol).

Male genitalia. Abdomen without eversable sacs, but with thick hair patches on segment VII and VIII, patches on VII much larger than those on VIII, with median sclerotized plate. Segment VII annular, with ventromesal process. Segment VIII triangular, narrowing anteroventrally. Segment IX truncate posteriorly, anteriorly narrowing ventrally; in dorsal view narrow posteriorly, anteriorly rounded. Preanal appendage (cercus) short and rectanguloid in lateral view; in dorsal view lobate; dorsolateral hook elongate and apically curving ventrad in lateral view; in dorsal view thick, with distal hook projecting laterally and serrate. Segment X elongate and narrow, in dorsal view thin and slightly tapering to notched apex, basally with membranous triangular lobe. Inferior appendages in lateral view rectanguloid, distally with posteroventral incision; in dorsal and ventral views wide basally, narrowing in distal ¼ length to acute apex. Phallus tubular, narrowing below mid-length where a lateral process originates, subapically with pair of spines, lowermost short, uppermost about twice length of lower and projecting posteriorly, apex with lateral sclerite.

Female and larva. Unknown.

Type material. Holotype male. Panama, Coclé Province, Cuenca 105, Omar Torrijos Herrera National Park , Quebrada Corazones , PSPSCB-PNGDOTH-C103-2017-001, Malaise trap, 8.6776°N and 80.6001°W, 728 m, 22–26 March 2017, A. Cornejo, T. Ríos, E. Álvarez, and E. Pérez (COZEM).

Etymology. Named for the stream, Quebrada Corazones, from which the species was collected.

Figures

Figure 7. Metrichia corazones, sp.n. Male genitalia. A) Lateral view. B) Ventral view. C) Dorsal view. D) Phallus, lateral view. E) Phallus, dorsal view.

Figure 8. Metrichia corazones, sp.n. Male features. F) Foreleg tibia, ventral view. G) Abdominal segments VII and VIII, dorsal view. H) Antenna, dorsal view.