Redescription of Hypoptopoma inexspectata (Holmberg, 1883), with notes on its anatomy (Siluriformes: Loricariidae).
Hypoptopoma inexspectata is diagnosed and redescribed based on the examination of additionalmaterial and comparison with its congeners. This poorly known hypoptopomine species is distributed in theParaguay and Paraná river draínages. Hypoptopoma inexspectata is diagnosable based on theautapomorphy biserial arrangement of anterior snout rostral margin odontodes, laterally extended to limitbetween second and third infraorbital plates, with dorsally directed dorsad series separated from ventrallydirected ventrad series by a narrow odontode-free area, which at the level of first and second infraorbitalplates is reduced to a dividing line of the series. The species can be further distinguished by thecombination (1) low number of canal-bearing lateral plates (20-22, typically 21), (2) presence of a shield ofprepectoral dermal plates, (3) arrangement of abdominal plates in one paired series of 3-5 plates, (4)shorter least interorbital distance 4856% head lengh, (5) larger horizontal eye diameter 17-20% head lengh,and (6) least orbit-nare distance 812% head lengh. Intraspecific variation skull dermal bones, neuracraniumand suspensorium bones, dermal plates, adipose fin is reported. (PDF has 20 pages.)
| Main Authors: | , |
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| Format: | article biblioteca |
| Language: | English |
| Published: |
Physis
2001
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| Subjects: | Biology, Limnology, Argentina, Ichthyology, Ictiología, Siluriformes, Loricariidae, Hypoptopomatinae, Taxonomy, Taxonomía, Anatomy, Anatomía, |
| Online Access: | http://hdl.handle.net/1834/19659 |
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