Identification of the holotype of Pleuronectes chrysopterus Bloch and Schneider 1801 as a species of Platichthys (Pleuronectidae), not Pseudorhombus arsius (Hamilton 1822) (Paralichthyidae)

Pleuronectes chrysopterus Bloch and Schneider 1801 has previously been regarded as a putative junior synonym of Pseudorhombus arsius (Hamilton 1822) (Paralichthyidae). However, the holotype of the former was found to conform to the right-eye flounder genus Platichthys Girard 1854 (Pleuronectidae), a...

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Bibliographic Details
Published in:Ichthyological research 2024, Vol.71 (1), p.187-192
Main Authors: Matsunuma, Mizuki, Tashiro, Fumihito
Format: Article
Language:English
Subjects:
Animal Systematics/Taxonomy/Biogeography
Biomedical and Life Sciences
Congeners
Ecology
Fins
Freshwater & Marine Ecology
Holotypes
Lateral line
Life Sciences
Paralichthyidae
Platichthys
Platichthys flesus
Pleuronectes
Pleuronectidae
Pseudorhombus arsius
Short Report
Species
Synonymy
Zoology
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Summary:Pleuronectes chrysopterus Bloch and Schneider 1801 has previously been regarded as a putative junior synonym of Pseudorhombus arsius (Hamilton 1822) (Paralichthyidae). However, the holotype of the former was found to conform to the right-eye flounder genus Platichthys Girard 1854 (Pleuronectidae), and be most similar to the European flounder Platichthys flesus (Linnaeus 1758) and Baltic flounder Platichthys solemdali Momigliano, Denys, Jokinen and Merilä 2018 in having rough scales with bony tubercles distributed along the anterior portion of the body and along the dorsal- and anal-fin bases, exposed cycloid scales entirely covering the body, and 64 dorsal- and 44 anal-fin rays. Such a character combination set the holotype specimen apart from two northwestern Pacific congeners of Platichthys , which suggests that the originally stated type locality “Chinese sea” of Pleuronectes chrysopterus , may have been erroneous. Furthermore, the holotype has an unusually high number of pored lateral-line scales compared with all other species of Platichthys (123 vs. 60–90), possibly indicating that the holotype is a morphologically abnormal individual of a species of Platichthys or a hybrid individual of a species of Platichthys and another pleuronectid species in a different genus, with a high number of pored lateral-line scales.
ISSN:1341-8998
1616-3915
DOI:10.1007/s10228-023-00921-5