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A new species of Polyipnus from the western Indian Ocean, with comments on sternoptychid ecology


A new species of Polyipnus from the western Indian Ocean, with comments on sternoptychid ecology



Proceedings of the Biological Society of Washington 111(4): 942-953



ISSN/ISBN: 0006-324X

Polyipnus limatulus is described based on material collected in the Gulf of Aden and immediately adjacent areas of the northwestern Indian Ocean. These collections were made during midwater fish surveys conducted from three vessels, R/V Beinta (1987), R/V Malcolm Baldridge (1995), and R/V Tyro (1992). Like other species in this genus P. limatulus appears to occur in association with the continental slope and/or various types of sea floor rises. Polyipnus limatulus shares certain apomorphic characters with the P. spinosus species group; among these are a multispinose posttemporal, and the occurrence of numerous spine-like denticles on the modified scales covering many of the ventral photophores. These denticles are lacking on the ACB photophore scales, a character which distinguishes the new species from a putatively closely related species, P. asper (eastern Indian ocean). Polyipnus indicus (western Indian Ocean) has somewhat similar scale denticulation but has a relatively unmodified parietal, among other differences. The new species was found to occur in relatively warm, saline, low oxygen water associated with Red Sea outflow, whereas the other Polyipnus species collected during the R/V Tyro survey, P. omphus Baird, 1971 was collected in the colder, less saline, higher oxygen water associated with the Somali Current.

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Accession: 029717035

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