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Free Content A new species of Urodasys (Gastrotricha, Macrodasyida) from dysoxic sediments of the Santa Barbara Basin (California, U.S.A.)

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Numerous specimens belonging to an undescribed macrodasyid gastrotrich species were recovered during a survey of the biota associated with the severely dysoxic sediments of the Santa Barbara Basin, off California, U.S.A. Densities of this species reach 10 specimens cm−2. Urodasys anorektoxys sp. nov. is described and figured. Specimens of this taxon attain the largest size within the genus; body, excluding the motile tail, is up to 1100 μm in length. Adults are protandric, then simultaneous hermaphrodites and lack a stylet-like sexual structure; the main morphological traits include (1) a unitary ventral ciliary field, and (2) a pharyngeal region that bears a total of 14 pairs of adhesive tubes, 12 pairs ventrolaterally and two pairs dorsolaterally. The systematic position of the new species is discussed.

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Document Type: Research Article

Publication date: 2000-03-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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