Graduate Thesis Or Dissertation
 

A review of the deep water Liparidae from the coast of Oregon and adjacent waters

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ft848t78q

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  • Descriptions and distributions are given of 28 species of Liparidae occurring or possibly occurring below 200 m between San Francisco and northern Vancouver Island, with keys for their identifications. Nine genera are included: Careproctus, Elassodiscus, Lipariscus, Nectoliparis, Rhinoliparis, Acantholiparis, Paraliparis, and two new genera are described, Odontoliparis and Osteodiscus. Eight new species are described: Careproctus filamentosus, C. microstomus, C. oregonensis, Osteodiscus cascadiae, Odontoliparis ferox, Paraliparis paucidens, P. megalopus, and P. pectoralis. One generic change is made: Elassodiscus caudatus is removed from Paraliparis. Second records of four species are reported: Careproctus longifilis, C. ovigerum, Paraliparis latifrons, and Acantholiparis caecus. The occurrence of four known species previously unreported from Oregon is recorded: Careproctus longifilis, C. ovigerum, Paraliparis latifrons, and P. rosaceus. Previously doubtful Oregon occurrence of two species, Paraliparis dactylosus and P. ulochir, is verified. Two rare species were collected: Paraliparis cephalus and P. mento. Four species are included as possibly occurring off Oregon: Careproctus cypselurus, Rhinoliparis barbulifer, Paraliparis deani, and P. melanobranchus. Other species present are Careproctus melanurus, C. gilberti, and Acantholiparis opercularis. Of the 28 species from the study area, four are considered to be pelagic: Nectoliparis pelagicus, Lipariscus nanus, Rhinoliparis attenuatus, and Rhinoliparis barbulifer. The benthic species are shown to be divisible into two groups based on depth distributions. The shallower group contains 13 species which occur between 200- 2200 m; the deeper contains 11 species from 2200-3600 m. Morphological characters are related to the depth distributions of the species possessing them. Shallower species tend to have more pectoral and caudal rays, and more pyloric caeca than deep living species; they have pale skin, and darkly pigmented stomachs; the opposite is true in deeper species. The more primitive genera of deep water liparids do not occur shallower in the study area than more derived genera, although the more primitive species within those genera do.
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