title: A Third New Species of Aporcelinus (Dorylaimida, Aporcelaimidae) from Vietnam, with the First SEM Study of a Representative of the Genus.
abstract: A new species, the third one from Vietnam, of the genus Aporcelinus is described from natural areas. Aporcelinus falcicaudatus sp. n. is characterized by its 1.28 to 1.63 mm long body, lip region offset by weak constriction and 16 to 18 µm broad, odontostyle 18 to 21 µm at its ventral side, neck 354 to 406 µm long, uterus tripartite and 61 to 95 µm long, V = 50 to 55, tail strongly recurved dorsad and conical (23-31 µm, c = 43-58, c' = 0.7-0.9) with finely rounded tip, and male absent. Scanning electron microscope (SEM) study, the first of a representative of the genus, shows a lip region pattern significantly different from that observed in the typical aporcelaimid taxa.
authors.affiliation: Department of Terrestrial Ecology, Zoological Institute, University of Cologne, Zülpicher Straße 47b, D-50674 Cologne, Germany.; Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus 'Las Lagunillas' s/n, Edificio B3, 23071-Jaén, Spain.; Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam.
authors.forename: Thi Anh
authors.initials: TA
authors.lastname: Duong Nguyen
authors.affiliation: Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus 'Las Lagunillas' s/n, Edificio B3, 23071-Jaén, Spain.
authors.forename: Joaquín
authors.initials: J
authors.lastname: Abolafia
authors.affiliation: Department of Terrestrial Ecology, Zoological Institute, University of Cologne, Zülpicher Straße 47b, D-50674 Cologne, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Bonkowski
authors.affiliation: Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus 'Las Lagunillas' s/n, Edificio B3, 23071-Jaén, Spain.
authors.forename: Reyes
authors.initials: R
authors.lastname: Peña-Santiago
keywords: aporcelaims; description; free-living nematodes; southeast Asia; taxonomy