DESCRIPTION OF A NEW SUBSPECIES OF SIMOCEPHALUS HIMALAYENSIS CHIANG ET CHEN, 1974 (CRUSTACEA: DIPLOSTRACA)
Chen Shouzhong (Institute of Hydrobiology, Academia Sinica) Shi Xinlu Shi Xinbai (Harbin Normal University)
The present paper reports a new subspecies Simocephalus himalayensis microdus ssp. nov. collected from Heilongjiang Province, China. The type specimens are deposited in the Department of Biology, Harbin Normal University.This new subspecies resembles the subspecies nominotypica, but may be readily distinguish from the latter by: (1) Valves with strongly transverse lines and forming fine serration on the dorsal posterior margin. (2) Head narrow with more concave ventral margin. (3) Rostrum long, projected and slightly curved anterioly. (4) Antennule with a sensory seta in basal part of anterior margin. (5) Antennae short and not reaching the middle of the body. (6) Postabdomen wider in distal part, but narrower than S. himalayensis himalayensis on the anal denticles part, preanal corner more projecting and anal denticles numerous.