Pseudexostoma Chu, 1979
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publication ID |
z01345p001 |
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DOI |
https://doi.org/10.5281/zenodo.6254473 |
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persistent identifier |
https://treatment.plazi.org/id/E5755B8C-4B63-01CB-D8A9-B2A3904157A4 |
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treatment provided by |
Thomas |
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scientific name |
Pseudexostoma Chu, 1979 |
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Pseudexostoma Chu, 1979 View in CoL View at ENA ZBK
Fig. 26
Pseudexostoma Chu, 1979 ZBK : 78, 81. (Type species: Glyptosternum yunnanensis Tchang, 1935 ZBK , by original designation). Gender neuter.
Diagnosis: Continuous post-labial groove; gill openings not extending onto venter; heterodont dentition in both jaws; outer teeth shovel-shaped and sparsely arranged in one or two rows, inner teeth conical and numerous; tooth patches separated in upper jaw; 16-18 branched pectoral rays.
Pseudexostoma ZBK is distinguished from Glyptosternon ZBK , Glaridoglanis ZBK , Euchiloglanis ZBK , Pareuchiloglanis ZBK and Parachiloglanis ZBK by having a continuous post-labial groove (Table 5). Pseudexostoma ZBK is distinguished from Myersglanis ZBK , Exostoma ZBK , Oreoglanis ZBK by having heterodont dentition in the upper jaw (vs. homodont = pointed in Myersglanis ZBK and Oreoglanis ZBK , and homodont = oar-shaped in Exostoma ZBK ), and from Myersglanis ZBK and Exostoma ZBK by having heterodont dentition in the lower jaw (vs. homodont = pointed in Myersglanis ZBK , and homodont = oar-shaped in Exostoma ZBK ). It is further distinguished from Exostoma ZBK by having 16-18 (vs. 10-11) branched pectoral rays, and from Myersglanis ZBK and Oreoglanis ZBK by having tooth patches separated in the upper jaw.
Description: 5-6 dorsal rays; 16-18 branched pectoral-fin rays; 6 pelvic-fin rays; 3-6 anal-fin rays. Head depressed; body elongate, depressed anteriorly. Eyes minute, dorsal, subcutaneous, dorsal. Lips thick, fleshy, papillated. Teeth of two distinct types in two wellseparated patches in both jaws; outer teeth shovel-shaped and sparsely arranged in one or two rows, inner teeth conical and numerous. Maxillary barbel with well-developed membrane, soft base, striated pad of adhesive skin. Gill openings narrow, extending only to a point above pectoral-fin base. Branchiostegal membranes confluent with isthmus. Coracoid process not externally visible. No thoracic adhesive apparatus. Paired fins plaited to form an adhesive apparatus.
Distribution: Irrawaddy and Salween drainages, Yunnan, China (Chu et al., 1999).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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