Abstract
Eight species of Diplopeltoides are described from the Swedish west coast. Diplopeltoides suecicus sp. nov. has the cuticle with longitudinal striation visible only under SEM; cuticular plate underlying the cephalic cuticle around the amphid present; cephalic sensilla 4–6 µm long; amphid an inverted U-shape; wide space between amphidial branches areolated; spicules 27–31 µm long; gubernaculum with caudal apophysis. Diplopeltoides longicaudatus sp. nov. is characterized by a cuticle without longitudinal striation; cuticular plate underlying cephalic cuticle around amphid present; cephalic sensilla 13 µm long; amphid an inverted U-shape; narrow space between amphidial branches not ornamented; spicules unequal in size, 27–31 µm long; gubernaculum absent; midventral precloacal cuticular ridge present. D. grandis sp. nov. is characterized by a cuticle with longitudinal striation; cuticular plate underlying cephalic cuticle around amphid present; cephalic sensilla 18.5 µm long; amphid an inverted U-shape; wide space between amphidial branches punctate. The following taxonomic changes are proposed: Diplopeltoides asetosus (Juario, 1974) comb. nov., Diplopeltoides botulus (Wieser, 1959) comb. nov., Diplopeltoides bulbosus (Vitiello, 1972) comb. nov., Diplopeltoides lucanicus (Boucher & Helléouët, 1977) comb. nov., Diplopeltoides pumilus (Vincx & Gourbault, 1992) comb. nov. and Diplopeltoides striatus (Gerlach, 1956) comb. nov. Diplopeltoides holovachovi Fadeeva & Mordukhovich, 2013 is synonymised with Diplopeltoides pumilus comb. nov. An updated key to the species of Diplopeltoides is provided.
Highlights
The genus Diplopeltoides was proposed by Gerlach (1962) for the species Diplopeltis ornatus Gerlach, 1950 with the main diagnostic characters: “complicated cuticular structure and a ring-shaped cephalic capsule”
Annulation starts at level with the amphids; annules smooth or with fine longitudinal striation
Cephalic sensilla setiform or papilliform; their bases located at the base of the labial region, anterior to amphid
Summary
The genus Diplopeltoides was proposed by Gerlach (1962) for the species Diplopeltis ornatus Gerlach, 1950 with the main diagnostic characters: “complicated cuticular structure and a ring-shaped cephalic capsule”. Tchesunov (1990, 2006) added three species to this genus: he described Diplopeltoides mastigia Tchesunov, 1990 as new to science and transferred Diplopeltula anatolii Voronov, 1982 and Diplopeltula nuda Gerlach, 1956 to Diplopeltoides. One year later, yet another species, Diplopeltis onustus Wieser, 1956, was transferred to the genus Diplopeltoides by Vincx & Gourbault (1992). This action was contested in a subsequent publication in which the taxonomy of the genus was completely revised (Holovachov et al 2009). One new species, Diplopeltoides holovachovi Fadeeva & Mordukhovich, 2013 was proposed by Fadeeva & Mordukhovich (2013), making a total of 11 species
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