Metrichia macdonaldi Harris and Armitage, 2019

Harris, Steven C. & Armitage, Brian J., 2019, The Trichoptera of Panama X. The Quebrada Rambala drainage, with description of 19 new species of microcaddisflies (Trichoptera: Hydroptilidae), Insecta Mundi 707 (707), pp. 1-54 : 10

Metrichia macdonaldi Harris and Armitage , new species

Fig. 8

Diagnosis. Metrichia macdonaldi is placed in the nigritta group of Flint (1972) on the basis of the thick setal patches arising between the fifth and sixth abdominal segments and the pair of stout subapical hooks on the phallus. The new species has rectanguloid inferior appendages somewhat similar to that of M. longitudinis Bueno-Soria and M. pernambucana Souza and Santos , however the setal patches, and structure of the phallus, are much different in the new species.

Male. Length 2.6–2.9 mm. Head without modification. Antennae with 19 segments, middle segments slightly widening and flattened. Body and unmodified wings brown in alcohol. Abdominal segments with thick setal patches between segments V and VI, those on V much thicker than those of VI. Segments VII and VIII annular. Segment IX triangular in lateral view, anterior portion within segment VIII, posterior margin rounded dorsally; in ventral and dorsal views annular. Preanal appendage (cercus) thin in lateral view, apex rounded; in dorsal view short and lobate; dorsolateral hook narrow, widening to hatchet-like apex, posteriorly with several sclerotized processes; in dorsal view narrow over length, to widened, curved apex. Segment X membranous and rectangular laterally; in dorsal view thin and triangular, apex truncate. Inferior appendages in lateral view rectanguloid, narrowing anteriorly to rounded apex; in dorsal and ventral views wide basally, gradually narrowing anteriorly to rounded apex, series of peg-like setae on inner margins. Phallus widening basally and apically, apex in dorsal view with pair of spines subapically, inner spine short and stout, outer spine elongate and sharply curving at midlength, pair of short, stout spines basally; in lateral view two subapical spines evident, lowermost one straight, and upper one curving to acute upturned spike; ejaculatory duct thin extending anteriorly beyond curving spine.

Female. Unknown.

Type material. Holotype, male— Panama, Bocas del Toro Province, Quebrada Rambala, near Rambala Jungle Lodge , 3.74 km SSE Rambala, 8.91627°N and 82.15469°W, 120 m, Malaise trap February 6–12, 2017, E. Carlson.

Etymology. We take great pleasure in naming this species for John R. MacDonald of the Mississippi Entomological Museum, Mississippi State University, for his dedicated study of the Lepidoptera of Panama and for assisting us with the collection of Trichoptera and Plecoptera specimens.

Figures

Figure 8. Metrichia macdonaldi, sp. n., Male genitalia. A) Lateral view. B) Ventral view. C) Dorsal view. D) Phallus, lateral view. E) Phallus, dorsal view. F) Abdominal segments IV, V, and VI, dorsal view.