Abstract
Two species of Tomoceridae were found near Dalat, southern Vietnam. Tomocerus ocreatus Denis, 1948 is redescribed based on a neotype specimen. Previous records of Tomocerus ocreatus in non-type localities are reevaluated. A new species Tomocerina annamitica sp. nov. is described. The new species is mainly characterized by its small body size, pointed tenent hair, compound dental spines and the absence of intermediate teeth on mucro.
Highlights
The family Tomoceridae contains at least 169 known species (Bellinger et al 1996–2015) distributed worldwide
Three species were previously described from Vietnam: Tomocerus ocreatus Denis, 1948 from Dalat, Lam Dong Province; Tomocerus nodentalis Nguyen, 1995 from Moc Chau, Son La Province; and Tomocerus postantennalis Yu, Zhang & Deharveng, 2014 from Na Hang, Tuyen Quang Province
Moderate to large sized Tomocerinae, usually longer than 3 mm; body colour pale to dark, some species with distinct colour pattern; eyes at most 6+6; trochantero-femoral organ reduced to 1, 1 chaetae; dens of furca basally without outer strong chaetae or inner large differentiated scales; shape of dental spines from simple to compound among different species; mucro with two dorsal lamellae and two basal teeth, outer basal tooth with corner toothlet
Summary
The family Tomoceridae contains at least 169 known species (Bellinger et al 1996–2015) distributed worldwide. Three species were previously described from Vietnam: Tomocerus ocreatus Denis, 1948 from Dalat, Lam Dong Province; Tomocerus nodentalis Nguyen, 1995 from Moc Chau, Son La Province; and Tomocerus postantennalis Yu, Zhang & Deharveng, 2014 from Na Hang, Tuyen Quang Province. Tomocerus ocreatus is characterized by the shape and arrangement of dental spines. Tomocerus nodentalis and Tomocerus postantennalis are both endemic species, whereas Tomocerus ocreatus is known to be the most widely distributed Asian species of Tomocerus Nicolet, 1842. Intraspecific differences were often reported by descriptions of non-type Tomocerus ocreatus. A molecular study (Zhang et al 2014) revealed “cryptic” diversity among Chinese specimens previously identified as Tomocerus ocreatus
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