Description of Acrobeloides arctowskii sp. n. (Rhabditida: Cephalobidae) from King George Island, Antarctica

A new species of Acrobeloides, A. arctowskii sp. n., is described from soil around roots of Deschampsia antarctica oil King George Island, South Shetland Islands, Antarctica. The new species adds to the Antarctic terrestrial nematode fauna and resembles most closely A. arenicola Abolafia & Pena-Santiago, 2003 by having acute labial probolae, five incisures in lateral field and an acute colloid tail. It differs front A. arenicola in its longer body (L = 804-1101 mu m vs L = 476-729 mu m), longer post-vulval uterine branch (43-65 mu m vs 24-40 mu m), strongly protruding vulval lips (vs continuous Mill body contour), longer spicules (41-48 mu m vs 24-27 mu m) and longer gubernaculum (21-27 mu m vs 14-15 mu m).