Costatrichia santosi Harris and Armitage

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: 9-10

publication ID

publication LSID


persistent identifier

treatment provided by


scientific name

Costatrichia santosi Harris and Armitage

new species

Costatrichia santosi Harris and Armitage   , new species

Fig. 7 View Figure 7

Diagnosis. Costatrichia santosi   appears to be most similar to a cluster of species, including C. devestiva Thomson and Armitage   , C. dietrichi Thomson and Armitage   , C. falsa Santos, Takiya and Nessimian   , and C. zopilote Holzental and Harris   , all of which have stout spines projecting from posterior processes on abdominal segment VIII. These species are separated by the location of these processes, the number of spines and their thicknesses. Santos et al. (2016) suggested that C. falsa   and C. zopilote   should be transferred to the genus Leuotrichia based on similarities in the male reproductive structures and molecular data for C. falsa   , but also mentions that such a move may be premature pending more analyses of all Leucotrichiini   genera. Pending more studies of the Leucotrichiini   , we are leaving the species mentioned above in Costatrichia   , while acknowledging the closeness of the species in the cluster above. The new species appears closest to C. dietrichi   and C. devestiva   based on the pair of spines from segment VIII, but in C. dietrichi   these spines originate from one process, and of the spines in C. devestiva   , only the dorsal most originates from a posterior process. Like C. falsa   and C. dietrichi   , the phallus of C. santosi   has a pair of thickened spines apically, but the posterior spines of segment VIII in C. falsa   are more similar to those of C. zopilote   , one of which is much longer than those seen in C. zopilote   .

Male. Length 2.1–2.4 mm. Head unmodified, with 3 ocelli, antennae with 18 segments, scape and first flagellar segment elongate, color brown in alcohol. Abdominal segment VII annular with acute, ven- tromesal process, anteriorly with sclerotized ridge. Segment VIII with posterior margin divided into a pair of elongate lateral processes, each bearing a long, thickened seta, dorsomesal process longer than ventromesal, with elongate seta thinner than that on the ventromesal process, short spine at base of insertion, anteriorly with numerous sharp spines, ventromesal process short with elongate seta thickening apically, narrow, acute process posteroventrally; in dorsal and ventral views, segment elongate with setal-bearing processes lateral in position, outer process much longer than inner process. Segment IX with anterolateral margin rounded, posterolateral margin shallowly concave with dorsal and ventral sclerites, posterolateral process bearing several apical setae; in dorsal view anterior margin concave, posterior margin with dorsal sclerite knoblike, anterior and posterior margins shallowly incised; in ventral view posterior margin incised mesally and laterally. Tergum X square, with dorsal posterior lobe; dorsally with lateral margins sclerotized, posteriorly triangular. Inferior appendage square, with narrow, setal-bearing process posteriorly; in ventral view sinuate on margins, setal-bearing processes laterad. Phallus apex in dorsal view with pair of thin, elongate sclerites distally which taper anteriorly; in lateral view apical sclerite dorsal in position and crescent-shaped, basal supports thin and lacking basal loop.

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 GoogleMaps   . Paratypes. Same information as holotype, 7 males; GoogleMaps   ibid., but December 21–31, 2016, 2 males GoogleMaps   ; ibid., November 15–20, 2016, 1 male GoogleMaps   ; ibid., March 31–April 11, 4 males GoogleMaps   ; ibid., October 7–9, 2016, 2 males; GoogleMaps   ibid., tributary to Quebrada Rambala , 134 m, January 22, 2015, E. Carlson, 4 males ( SCH)   .

Etymology. We take great pleasure in naming this species for our colleague Allan Paulo Moreira Santos for his many contributions to the study of Neotropical microcaddisflies.


Museum zu Allerheiligen