Some rare species of cephalobs (Nematoda: Rhabditida: Cephalobidae) from Southern Iberian Peninsula.

Six rare species of the family Cephalobidae (Pseudacrobeles laevis, Heterocephalobellus magnificus, Stegelleta ophioglossa, Paracrobeles psammophilus, Nothacrobeles nanocorpusandAcrobeles bushmanicus) are described from the Southern Iberian Peninsula, mainly from sandy habitats. Five of these species are reported for the first time from Spain and four of them from Europe. Furthermore, the male ofN. nanocorpusis described for the first time. Descriptions, measurements and illustrations are presented for all species. Scanning electron microscope study is provided forH. magnificus, N. nanocorpusandA. bushmanicus. In addition, comparative morphometrics for all species studied compared with other populations of the same species are included. [ABSTRACT FROM PUBLISHER]