Ollieopteryx dakshan, Weaver & Gibon & Chvojka & Oláh, 2020

Weaver, John S., Gibon, François-Marie, Chvojka, Pavel & Oláh, János, 2020, Ollieopteryx, a new genus of caddisflies from Madagascar (Trichoptera Dipseudopsidae), Zootaxa 4890 (4), pp. 567-577 : 572

Ollieopteryx dakshan , new species

Figs 12–14

Diagnosis. Ollieopteryx dakshan differs from O. inopinata and O. fianarana by having the inferior appendages each with the ventral branch broadly spatulate and the basodorsal branch only 1/2 as long as the ventral branch; the preanal appendages are only 1/2 as long as tergites IX + X; and the presumed intermediate appendages are absent (however, it is difficult to be certain whether the preanal or the intermediate appendages are actually absent.)

Description. Male. Color in alcohol light brown. Wings having venation same as in Fig. 5 (of O. fianarana ). Forewings each 7 mm long. Genitalia ( Figs 12–14 ): Sternum IX oval in lateral view, projecting and convex anteriorly and posteriorly, dorsally each side narrowing towards articulation with tergum IX. Tergites IX + X not clearly delineated and not heavily sclerotized (but this is possibly due to over-clearing), together fingerlike, directed posterad and having dorsal and ventral margins nearly straight and parallel in lateral and dorsal views, with apex of ventral margin curved slightly dorsad in lateral view; broadly spatulate in dorsal view. Presumed preanal appendages (pre. app.) directed posterad, each capitate with apex acuminate and bearing only one spiniform seta (but several large empty setal sockets present which probably once also held spiniform setae). Intermediate appendages apparently absent. Inferior appendages (inf. app.) directed posterad and about as long as tergites IX + X; each having 1) ventral main branch broadly spatulate in lateral view, more slender in ventral view, and 2) with basodorsal branch forming slender prong, curved at base and extending posterad, half as long as main process. Phallic apparatus long, tube-like and almost straight; partially retracted endotheca (membranous apical part) slightly widened apically; probably with internal sclerites but not observed (because type was cleared excessively).

Etymology: Sanskrit dakshan , southern (in reference to the southern hemisphere).

Holotype: MADAGASCAR, Sahafanjana , Manambato, Anove, male, April 1955, leg. R. Paulian (MNHN).

Figures

FIGURES 12–14. Ollieopteryx dakshan n. sp., male genitalia. 12, left lateral (pre. app. = preanal appendage (paired); inf. app. = inferior appendage (paired); IX, X = abdominal segments IX and X); 13, abdominal segments IX and X and preanal appendages, dorsal; 14, abdominal segment IX and inferior appendages, ventral.

FIGURES 5–8. Ollieopteryx fianarana n. sp., male. 5, abdominal segments VIII, IX, and X and appendages (all appendages paired), left lateral (app. = appendage); 6, abdominal segments VIII, IX and X, dorsal; 7, sternite IX with inferior appendages, preanal appendages, and intermediate appendages, ventral; 8, sternite V, left lateral.