Rhynchobatus mononoke , a new species of wedgefish (Rhinopristiformes: Rhinidae) from Japan, with comments on Rhynchobat
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Rhynchobatus mononoke, a new species of wedgefish (Rhinopristiformes: Rhinidae) from Japan, with comments on Rhynchobatus laevis (Bloch and Schneider 1801) Keita Koeda1 · Masahide Itou2 · Morihiko Yamada3 · Hiroyuki Motomura4 Received: 23 June 2020 / Revised: 24 August 2020 / Accepted: 24 August 2020 © The Ichthyological Society of Japan 2020
Abstract Rhynchobatus mononoke sp. nov. (Rhinopristiformes: Rhinidae) is described from mature male and female specimens from southern Japan. A juvenile specimen, newly born from a captive individual collected from Kagoshima, is also referenced (non-type). The new species can be distinguished from congeners by a combination of its obtusely wedge-shaped snout, bluntly rounded dorsal fins, first dorsal fin originating about level with the pelvic-fin origin, and the outer fold on the spiracle posterior margin more pronounced than the inner fold. Distinctive coloration of the new species included a black blotch, followed by a single white spot (rarely absent) posterodorsally on the middle of the pectoral disc, and a large black blotch covering the anterior half of the undersurface of snout. Distinct white spots distally on the pectoral disc to the middorsal area were absent. Most previous records of species of Rhynchobatus in Japanese waters were reidentified as Rhynchobatus australiae, except for the records from the northern East China Sea. Rhynchobatus mononoke appears to be endemic to southern Japan. Keywords Rhynchobatus australiae · Rhynchobatus djiddensis · Rhynchobatus laevis · Taxonomy · Endemic species · East China Sea · Rays
Introduction This article was registered in the Official Registry of Zoological Nomenclature (ZooBank) as F44F8EA2-FE37-4E6F-B5E9-A9964 0F6344B. This article was published as an Online First article on the online publication date shown on this page. The article should be cited by using the doi number. * Keita Koeda [email protected] Masahide Itou [email protected] Morihiko Yamada m‑[email protected] Hiroyuki Motomura [email protected]‑u.ac.jp 1
Kuroshio Biological Research Foundation, 560 Nishidomari, Otuki, Kochi 788‑0333, Japan
2
718 Kataura, Kasasa, Minamisatsuma, Kagoshima 897‑1301, Japan
3
The Kagoshima City Aquarium, 3‑1 Honkoshimmachi, Kagoshima 891‑0132, Japan
4
The Kagoshima University Museum, 1‑21‑30 Korimoto, Kagoshima 890‑0065, Japan
The wedgefishes (family Rhinidae) are moderate-sized to very large (0.8 − 3.1 m) shark-like batoids comprising three genera Rhina Bloch and Schneider 1801, Rhynchobatus Müller and Henle 1837, and Rhynchorhina Séret and Naylor 2016, the genus Rhynchobatus including eleven nominal species (eight valid) (Last et al. 2013, 2016a, b), viz. Rhynchobatus australiae Whitley 1939, Rhynchobatus cooki Last, Kyne and Compagno 2016a, b, Rhynchobatus djiddensis (Forsskål 1775), Rhynchobatus immaculatus Last, Ho and Chen 2013, Rhynchobatus laevis (Bloch and Schneider 1801), Rhynchobatus luebberti Ehrenbaum 1915, Rhynchobatus palpebratus Compagno and Last 2008, and Rhynchobatus
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