Mortoniella (Mortoniella) yayas Blahnik and Armitage, 2019

Blahnik, Roger J. & Armitage, Brian J., 2019, The Trichoptera of Panama. XII. Contributions to the family Glossosomatidae (Insecta: Trichoptera) in Panama, Insecta Mundi 740 (740), pp. 1-17 : 4-5

Mortoniella (Mortoniella) yayas Blahnik and Armitage , new species

Fig. 3

Diagnosis. This is another species of the “florica subgroup” of Mortoniella . The species is not particularly distinctive, differing from other species of the “subgroup” mostly by its own peculiar combination of characters. It is probably most closely related to M. pectinella Blahnik and Holzenthal , also from Panama, resembling that species in the structure of tergum X, particularly in its prominent, acute lateral lobes and broadly triangular mesal projection. In other details, however, it is quite different, lacking the pectinate apical projections on the paramere appendages of M. pectinella , and in having acute, rather than rounded, apices to the inferior appendages. Other characters useful in diagnosing the new species include the relatively narrow dorsolateral lobes of the phallicata, the narrow, concavely excavated apices of the paramere appendages, and the generally weakly inflected and posteriorly oriented apex of the dorsal phallic spine.

Description. Length of forewing: male 3.5 mm. Forewing with forks I, II, and III present, hind wing with forks II and III. Spur formula 0:4:4. Overall color (in alcohol) brown, anastamosis unpigmented, but otherwise not evidently marked.

Male genitalia. Ventral process of segment VII laterally compressed, short, ventrally projecting, rounded apically, length slightly greater than width at base, process not retracted anterobasally. Segment IX nearly evenly rounded anterolaterally, length greatest midlaterally, posterolateral margin slightly rounded and produced dorsally, narrowing ventrally; segment deeply excised dorsally and ventrally, forming lateral lobes, separated dorsomesally by much less than ½ width of segment. Tergum X moderately elongate, lateral margins subparallel, apically with broad, subtriangular mesal projection, subequal in length to apicolateral lobes; apicolateral lobes subtriangular, distinctly sclerotized, compressed, acute apically; ventrolateral lobes nearly obsolete; ventromesal lobes not evident. Inferior appendages without dorsolateral lobes, apicoventral lobes posteriorly projecting, relatively short, narrow, acute apically. Mesal pockets of inferior appendage with apical processes, short and weakly curved. Paramere appendage elongate, narrow, extending about same length as dorsal phallic spine, extreme apex concavely excavated on ventral margin. Dorsal phallic spine, as viewed laterally, undulate in contour, distinctly widened on ventral margin at about middle, ventral bulge articulating with dorsal margin of phallicata, apex acute, posteriorly directed; spine, in dorsal view ( Fig. 3D ), slightly widened in middle, narrowing apically, apex acute. Phallicata moderately elongate, dorsal margin with relatively narrow, paired, dorsolateral projections, lateral margin without compressed projection, ventral margin, as viewed ventrally ( Fig. 3C ), with elongate, weakly rounded lateral projections. Endophallic membrane simple, with single prominent curved ventromesal spine; phallotremal spines absent.

Female and immatures. Unknown.

Holotype male (alcohol). PANAMA: Cocle: Cuenca 134, Quebrada Las Yayas, La Pintada , El Harino , PSPSCD-PNGDOTH-C134-2017-004, 8.66168°N and 80.5952°W, 602 m, 25.iii.2017, UV light trap, E. Álvarez, E. Pérez, and T. Ríos ( COZEM).

Etymology. This new species is named after the Las Yayas stream from which it was collected. The name is formulated as a noun in apposition.

Figures

Figure 3. Mortoniella (Mortoniella) yayas, new species, male genitalia. A) Lateral. B) Segment IX and tergum X, dorsal. C) Phallic ensemble, ventral. D) Dorsal phallic spine, dorsal. E) Ventral process of segment VI, lateral.