On the nematode genus Heterodorus Altherr, 1952 (Dorylaimida: Nordiidae) with descriptions of three new species

摘要

The genus Heterodorus Altherr, 1952 is analysed and redefined. Of the nominal species, four are synonymized, namely H. magnificus Altherr, 1952 and H. thornei (Baqri & Jairajpuri, 1974) with H. arcuatus (Thorne, 1939), H. bongersi (Mushtaq, Baniyamuddin & Ahmad, 2007) with H. brevidentatus (Thorne, 1939) and H. satendri (Baqri & Jairajpuri, 1974) with H. constrictus (Jairajpuri & Loof, 1968). Three species, new to science, are described. Heterodorus unicus sp. n. from Papua New Guinea is distinguished by its small body (on average 1.23 mm), continuous lip region, short odontostyle as long as lip region width, far posteriorly located D nucleus, greenish intestine, deep vulva, and by a single ventromedial supplement. Heterodorus monticola sp. n. from Peru is characterized by its short body (on average 1.36 mm), continuous lip region, short odontostyle as long as 1.1–1.2 lip region widths, far posteriorly widened pharynx, strongly swollen vagina, and by two or three ventromedial supplements. Heterodorus alius sp. n. from Papua New Guinea also belonging to the small species (on average 1.22 mm long) shows some atypical or marginal characters: a longer cylindrus, more anteriorly located D nucleus (54–57 %), more anteriorly posited vulva (39–41 %), longer vagina, longer spicula, and a row of six or seven ventromedial supplements beginning closer to the adanal pair as usual. A key to the identification of Heterodorus species is added. Finally, an Enchodelus species is transferred to Papuadorus Andrássy, 2009 as P. coomansi (Nicholas & Stewart, 1985) comb. n.