Himantura lobistoma, a new whipray (Rajiformes : Dasyatidae) from Borneo, with comments on the status of Dasyatis microphthalmus

Bernardette Mabel Manjaji Matsumoto and Last, Peter R. (2006) Himantura lobistoma, a new whipray (Rajiformes : Dasyatidae) from Borneo, with comments on the status of Dasyatis microphthalmus. Ichthyological Research, 53 (3). pp. 290-297. ISSN 1341-8998


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A new long-snouted whipray, Himantura lobistoma, is described on the basis of seven specimens collected from the southeastern sector of the South China Sea, off western Borneo. It belongs to a subgroup of Himantura species provisionally defined herein as the "uarnacoides" complex that includes five nominal species: H. chaophraya, H. granulata, H. hortlei, H. pastinacoides, and H. uarnacoides. These whiprays all have a similar lateral disc shape (i.e., pectoral-fin apices broadly rounded rather than narrowly rounded or angular), a plain colouration (i.e., usually uniform light to dark brown dorsally, and pale or whitish ventrally with or without a dark margin), a long and slender whiplike tail, and platelike denticles in a broad dorsal band in adults. Himantura lobistoma can be distinguished from the superficially similar H. hortlei by its highly protrusible mouth and pelvic girdle with prominent lateral prepelvic processes. It differs from other members of the "uarnacoides" complex by a combination of internal and external morphological characteristics (e.g., having an extremely elongate snout and very small eyes). Another long-snouted stingray from the region, Dasyatis microphthalmus Chen, inadequately described and known only from the lost holotype, is considered a nomen dubium. It had been assigned to Himantura based on the absence of an obvious ventral cutaneous tailfold but may be conspecific with D. acutirostra.

Item Type: Article
Keyword: Dasyatidae, Dasyatis microphthalmus, Himantura lobistoma sp. nov., Nomen dubium, South China Sea
Subjects: Q Science > QL Zoology > QL1-991 Zoology > QL605-739.8 Chordates. Vertebrates > QL614-639.8 Fishes
Department: INSTITUTE > Institute for Tropical Biology and Conservation
Depositing User: ADMIN ADMIN
Date Deposited: 19 Mar 2012 14:35
Last Modified: 22 Aug 2021 11:20
URI: https://eprints.ums.edu.my/id/eprint/3709

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