Abstract
The description of Bryocyclopsasetussp. n. and the record of B.muscicola (Menzel, 1926) from Thailand are presented. The new species is most similar to B.maewaensis Watiroyram, Brancelj & Sanoamuang, 2012, the cave-dwelling species described from northern and western Thailand. They share morphological characteristics, such as the free margin of the anal operculum which is ovated and serrate, the same setae and the spines formulae on P1–P4Exp-2 (setae: 5.5.5.4; spines: 3.3.3.3) and Enp-2 of P1–P2, P4 (setae formula 3.4.3) in both sexes. The new species is easily distinguished from B.maewaensis due to typical divergent caudal rami, the absence of coxal seta on P1, and the absence of blunt-tipped setae on P2–P3Exp-2. A dichotomous key to the species of Bryocyclops group I sensuLindberg (1953) is proposed.
Highlights
The genus Bryocyclops Kiefer, 1927 is the most abundant genus of Cyclopidae Rafinesque, 1815 from Thailand and it is widely distributed in Southeast Asia
Six species have been reported from Thailand: B. maewaensis Watiroyram, Brancelj & Sanoamuang, 2012; B. maholarnensis Watiroyram, Brancelj & Sanoamuang, 2015; Copyright SantiWatiroyram
All species have so far been found in caves and are presumed to be endemic to Thailand, except B. muscicola, which frequently has been found in both subterranean and non-subterranean habitats (Jocque et al 2013; present study)
Summary
The genus Bryocyclops Kiefer, 1927 is the most abundant genus of Cyclopidae Rafinesque, 1815 from Thailand and it is widely distributed in Southeast Asia. The fine details (i.e. microcharacters) on the body ornamentation (cephalothorax scar, posterior margins, pores or grooves) and the structure of swimming legs (transformed setae and spines, and spiniform processes, especially the fourth leg and the male’s third leg) are often considered to be important characters in the most recently described species. These characteristics are useful for determining closely related species and degrees of leg modifications (Reid 1999; Fiers and van Damme 2017; Watiroyram 2018). An updated key to species of Bryocyclops group I sensu Lindberg (1953) is provided
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