Oecetis jacobsoni Ulmer 1930

Pandher, Manpreet Singh, Kaur, Simarjit, Garima, Deepti & Dubey, Anil Kumar, 2021, New records of Caddisflies (Insecta: Trichoptera) from India, Zootaxa 5072 (5), pp. 463-477 : 465

Oecetis jacobsoni Ulmer 1930 , NEW RECORD FOR INDIA

( Figs 1–5 )

Oecetis jacobsoni Ulmer 1930 , 465–466, 492, 498, figs 132–134.

Material examined. India: Andaman and Nicobar Islands Union Territory of India: North Andaman Island, Diglipur , 13º15’54.72”N, 92º58’5.00”E, 19.i.2019, Dubey ( NZC), 1 male and 4 females .

Diagnosis. The male genitalia of Oecetis jacobsoni are similar to those of O. meghadouta Schmid 1958 , O. ixion Malicky 2005 , and O. kodros Malicky 2005 . In all these species, each side of segment IX of the male genitalia (in lateral view) has a concave subdorsal excision anteriorly; the posterior subdorsal edge has a slight excision ending in a blunt projection at mid-height (in lateral view). Among these species, O. jacobsoni is more similar to O. meghadouta which is also a widespread species in the Oriental Region. However, in O. jacobsoni , the subdorsal excision on each side of the anterior edge never reaches to the dorsal meson of segment IX, the projection on each posterolateral edge of segment IX is broad and acute (but not toothed), whereas on each side of segment IX of O. meghadouta in lateral view the subdorsal excision on the anterior edge extends to the dorsal meson of segment IX and the posterolateral edge of segment IX has a toothed projection. Also, as observed by Malicky (2005), there are visible differences in the spots on the wings that are more nearly uniform, not surrounded by bright hyaline regions and less conspicuous than those of O. meghadouta in which each spot appears as a flower with round petals surrounded by a bright circle.

Distribution. India (Andaman & Nicobar Islands UTI, North Andaman Island), Indonesia (Sumatra), Nepal, Thailand, Vietnam, Sri Lanka.

Figures

FIGURES 1–5. Oecetis jacobsoni Ulmer 1930, male genitalia. 1, left lateral; 2, dorsal; 3, right inferior appendage, ventral; 4, phallus, left lateral; 5, phallus, ventral.