Description of a new marine predatory nematode Latronema dyngi sp. nov. (Nematoda, Chromadorida, Selachinematidae) from
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ORIGINAL PAPER
Description of a new marine predatory nematode Latronema dyngi sp. nov. (Nematoda, Chromadorida, Selachinematidae) from the west coast of Sweden and an updated phylogeny of Chromadoria Mohammed Ahmed 1
&
Oleksandr Holovachov 1
Received: 3 July 2020 / Revised: 8 October 2020 / Accepted: 15 October 2020 # The Author(s) 2020
Abstract A new nematode species, Latronema dyngi sp. nov., is described from Skagerrak off the west coast of Sweden with the type locality near Dyngö island. Latronema dyngi sp. nov. is characterized by multispiral amphideal fovea with circular outline, 0.2– 0.3 corresponding body diameters wide in males and 0.1–0.2 corresponding body diameters wide in females, 12 cuticular longitudinal ridges and 18–27 precloacal supplements in males. Latronema dyngi sp. nov. most closely resembles L. orcinum in terms of body length; demanian ratios a, b, c and c′; number of amphid turns in males; and the ratio of spicule length to cloacal body diameter. The two species can be differentiated by the number longitudinal ridges on the cuticle (12 for Latronema dyngi sp. nov. vs 20–22 for L. orcinum) and spicule length (65–78 μm for L. dyngi vs 60 for L. orcinum) and shape (weakly arcuate for L. dyngi sp. nov. vs strongly arcuate for L. orcinum). We also performed a maximum likelihood phylogenetic analysis on over 250 nematodes of the subclass Chromadoria based on their nearly full-length 18S rDNA sequences. In agreement with previous studies, our analysis supported Selachinematidae as a monophyletic group and placed Richtersia Steiner, 1916 within Desmodoridae Filipjev, 1922 or just outside of the main Desmodorida clade with the latter placement not well supported. Keywords Dyngö . Skagerrak . Choniolaiminae . Longitudinal ridges . Amphideal fovea
Introduction The genus Latronema Wieser, 1954 belongs to a family of predatory marine nematodes called Selachinematidae Cobb, 1915. Species of the family are characterized by wide stoma with armament that aids them in preying on other nematodes. The family currently comprises 13 genera grouped into two subfamilies, Choniolaiminae Schuurmans Stekhoven & Adam, 1931 and Selachinematinae Cobb, 1915. Latronema belongs to the subfamily Choniolaiminae whose members are
This article is registered in ZooBank under http://zoobank.org/ 8C027049-96A3-481F-94C8-9810E7682ACA Communicated by M. Schratzberger * Mohammed Ahmed [email protected] 1
Department of Zoology, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden
characterized by a stoma with broad, cup-shaped anterior chamber and a narrow, cylindrical posterior chamber. The first species of the genus Latronema was Latronema aberrans (Allgén, 1934), described then as a species of the genus Paracanthonchus Micoletzky, 1924 from Öresund. Wieser (1954) later established the genus Latronema with the description of L. piratica Wieser, 1954 and transferred two species, L. orcinum (Gerlach, 1952) and L. annulatum (Gerlach, 1953), both previously described under the genus name Synonchiella C
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