Ochrotrichia dewalti 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 : 15-16

Ochrotrichia dewalti Harris and Armitage , new species

Fig. 19

Diagnosis. This species is similar to a number of species in the aldama group of Flint (1972) on the basis of the simple, divided tenth tergum, notably O. paraldama Bueno-Soria , O. citra Bueno-Soria and Holzenthal , O. compacta Bueno-Soria and Holzenthal , and O. jolandae Bueno-Soria and Holzenthal, with closest similarity to O. dulcea Bueno-Soria and Holzenthal and O. bicaudata Bueno-Soria and Santiago-Fragoso. As with the latter two species, O. dewalti has the left side process of the tenth tergum wide and curving distally, and the right side process elongate and thin. The new species is separated from these two species and other members of the aldama group by the rhomboidal shape of the inferior appendages in lateral view and the concave inner margins of these structures in dorsal and ventral views, which bears a pronounced inner spike subapically.

Male. Length 2.3–2.7 mm, 31 antennal segments, first segment twice length of second, brown in alcohol. Abdominal segment VII annular, with short posteroventral process. Segment VIII narrow in lateral view, tapering ventrally; in dorsal view narrow, concave on posterior margin. Segment IX rectangular in lateral view, incomplete dorsally, sinuate posteriorly, tapering anteriorly; annular ventrally, medially truncate anteriorly, posteriorly with concave margin; dorsally narrow. Tergum X divided into two elongate processes, left side process narrow basally, widening below stout curving apex, right process thin and gradually narrowing to acute apex; in lateral view, outer process angulate below downward turning apex, inner process narrow, curving upward to acute apex. Inferior appendages parallel-sided in lateral view, apex rounded and tapering ventrad, numerous peglike setae on inner posterior margin; in dorsal and ventral views wide basally curving on inner margin to subapical acute spine, then tapering to rounded apex, numerous peglike setae on apical mesal margins. Phallus thin and elongate, subapically with pair of small lateral hooks on outer margin, pair of thin lobes mesally.

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, March 31–April 11, 2015, E. Carlson . Paratypes. ibid., 50 males ; ibid., Malaise trap, March 28, 2015, 8 males ( SCH) ; ibid., December 21–31, 2016, 38 males ; ibid., October 7–9, 2016, 40 males ; ibid., November 15–20, 2016, 1 male ; ibid., February 6–12, 2017, 25 males ; tributary of Quebrada Rambala , Rambala Jungle Lodge, 134 m, August 9, 2014, E. Carlson, 1 male ; ibid., above small falls, March 28, 2015, 52 males .

Etymology. We take great pleasure in naming this species for our colleague Dr. R. Edward DeWalt, aquatic entomologist with the Illinois Natural History Survey, in recognition of his lifetime of work on aquatic insects.

Figures

Figure 19. Ochrotrichia dewalti, sp. n., Male genitalia. A) Lateral view. B) Ventral view. C) Dorsal view. D) Phallus, dorsal view.