Ryuguderes casarrubiosi sp. nov., a new deep-sea representative of the enigmatic genus Ryuguderes (Kinorhyncha: Cyclorhagida: Campyloderidae) from the Indian Ocean

Type Article
Date 2022-09
Language English
Author(s) Cepeda DiegoORCID1, Sanchez Nuria2, Olu KarineORCID1, Zeppilli DanielaORCID1
Affiliation(s) 1 : Institut Français de Recherche pour l’Exploitation de la Mer (IFREMER), Centre de Bretagne, Biologie et Ecologie des Ecosystèmes marins Profonds (BEEP), ZI de la Pointe du Diable, CS10070, 29280, Plouzané, France
2 : Universidad Complutense de Madrid (UCM), Facultad de Biología, Departamento de Biodiversidad, Ecología y Evolución (BEE), C/ José Antonio Novais 12, 28040, Madrid, Spain
Source Zoologischer Anzeiger (0044-5231) (Elsevier BV), 2022-09 , Vol. 300 , P. 92-101
DOI 10.1016/j.jcz.2022.08.001
Keyword(s) Kinorhynchs, Mud dragons, Cold seeps, Deep -sea, Mozambique Channel, Taxonomy

A new species of the rare genus Ryuguderes is described from a deep-sea muddy seafloor part of a cold seep area at the Mozambique Channel (western Indian Ocean). The new species is easily distinguished from its only known congener by the arrangement of the middorsal (segments 2–9 in Ryuguderes iejimaensis vs. segments 1–10 in the new species) and the lateroventral acicular spines (segments 4 and 6–9 in R; iejimaensis vs. segments 3–4 and 6–9 in the new species) as well as the ventromedial female papillae (segments 6–7 in R. iejimaensis vs. segments 6–8 in the new species). Despite the ecological peculiarities of the habitat where the new species was found, all the examined specimens were recovered outside any active pockmark, which could point towards a lack of adaptation to the extreme environmental conditions associated with cold seeps.

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