Morphological and molecular characterization of two new species of the genus Aporcelinus Andrássy, 2009 (Nematoda, Dorylaimida, Aporcelaimidae) from the USA, with new insights on the phylogeny of the genus

Two new species of the genus Aporcelinus from the USA are described and illustrated. Aporcelinus floridensis sp. n. is characterized by its 1.12-1.52 mm long body, lip region offset by marked constriction and 14.5-17.0 μm broad with perioral liplets, odontostyle 16.5-20.0 μm at its ventral side and 1.1-1.2 times the lip region diameter, neck 316-395 μm long, pharyngeal expansion occupying 43-48% of total neck length, uterus simple and 33-56 μm long or 0.8-1.2 times the corresponding body diameter, V = 48-54, female tail conical (36-49 μm long, c = 27-41, c' = 1.2-2.0) with finely rounded terminus and no hyaline portion, and male absent. Aporcelinus paolae sp. n. is characterized by its 1.29-1.80 mm long body, lip region offset by marked constriction and 14-16 μm broad, odontostyle 15-17 μm at its ventral side and 1.0-1.1 times the lip region diameter, neck 314-397 μm long, pharyngeal expansion occupying 43-53% of total neck length, uterus tripartite and 128-164 μm long or 2.6-3.6 times the corresponding body diameter, V = 53-57, female tail conical (30-39 μm long, c = 40-51, c' = 1.1-1.3) with finely rounded terminus and variably re-curved dorsad, male tail conical (27-36 μm, c = 39-59, c' = 0.9-1.2), ventrally straight and dorsally convex, spicules 48-54 μm long, and 7-9 irregularly spaced ventromedian supplements lacking hiatus. The analyses of the D2-D3 expansion segments of 28S rRNA (LSU) gene sequences of the two new species confirmed the monophyly of the genus, based upon currently available data, showing a close relationship between the genera Aporcelinus and Makatinus, and justified the placement of Aporcelaimellus, Makatinus and Aporcelinus under the subfamily Aporcelaimellinae.

Two known species of Aporcelinus Andrássy, 2009 (Dorylaimida: Aporcelaimidae) from Vietnam, with the first molecular study of the genus

Two poorly known species of the genus Aporcelinus are characterised in detail and re-defined, including line drawings, LM and SEM pictures, on the basis of abundant material collected from natural habitats in Vietnam. Aporcelinus granuliferus is distinguished by its body 0.93-1.70 mm long, lip region offset by constriction and 15-17 μm broad, odontostyle 17-22 μm long, neck 270-403 μm long, pharyngeal expansion 132-214 μm long or 47-52% of total neck length, presence of a dorsal cell mass at the pharyngo-intestinal junction, uterus a simple tube 38-57 μm or 0.7-0.9 times than the corresponding body diam. long, V = 46-55, female tail conical (29-55 μm, c = 24-41, c′ = 0.7-1.9) with acute tip and lacking a hyaline region. Aporcelinus jiaonanensis is recognisable by its 1.11-1.71 mm long body, lip region offset by weak constriction with small inner liplets and 17-20 μm broad, odontostyle 20-23 μm long, neck 307-436 μm long, pharyngeal expansion 154-234 μm long or 47-55% of total neck length, uterus tripartite and 56-97 μm long or 1.0-1.5 times the corresponding body diam., V = 51-59, tail conical (23-43 μm, c = 29-68, c′ = 0.7-1.3) with finely rounded tip and a distinct hyaline region, spicules 51 μm long, and nine, regularly spaced, ventromedian supplements, two of them within the range of the spicules. Analysis of three D2-D3 28S rDNA gene sequences of A. jiaonanensis, the first from a representative of the genus, reveals a close relationship with members of Aporcelaimellus.