title: A new species of Halaphanolaimus (Nematoda: Leptolaimidae) from the southern Black Sea (Turkey) with a modified key for species identification.
abstract: Halaphanolaimus sergeevae n. sp. is described and illustrated from the Sinop coasts (southern Black Sea, Turkey). The new species morphologically resembles H. pellucidus Southern, 1914, but differs from it by having a higher number of tubular supplements (12-14 vs. 6-7), longer spicules (68-70 im vs 47-52 [tm), smaller tail/spicule ratio (1.6 vs. 2.7), smaller body size (926-1273 vs. 1500 microm), and smaller De Man indices of a, b and c'. An updated identification key to the species of Halaphanolainius is proposed.
authors.affiliation: Sinop University Faculty of Fisheries, Department of Hydrobiology, TRS57000 Sinop, Turkey. durkmez@sinop.edu.tr
authors.forename: Derya
authors.initials: D
authors.lastname: Orkmez
authors.forename: Michael L
authors.initials: ML
authors.lastname: Brennan
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D059038:Black Sea; D049628:Body Size; D005260:Female; D008297:Male; D009348:Nematoda / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D009929:Organ Size; D014421:Turkey