Antsulevich, A.E., 1997. A new species of deep-water hydroids from the North Pacific. Zool. Zh. 76 6: 750-753.

34131

Antsulevich, A. E.

1997

76: 750-753

Publication

Three colonies of Polyplumaria arenaria sp. n. were found in the Pacific Ocean off the Kuril Islands on the sandy bottom at a depth of 1100-1200 m. It is the first finding of Polyplumaria G.O. Sars, 1874 in the North Pacific. A brief diagnosis of the species is as follows: polysiphonic stem is divided into regular internodes; in the basal part the stem is separated into numerous thin tubes and forms hydrorhiza like a dense bundle encrusted with sand particles. Hydrocladia spring from the stem processes one by one branching (usually one time) after the first hydrothecae. A typical internode of hydrocladia bears one hydrotheca and four movable nematothecae (one couple is at the hydrotheca rim and two median singles: one of them is above the hydrotheca, the other is below it). The hydrothecae are deep, parallel to hydroclaida, adjacent to the hydrocladia axil. Only young stage of gonothecae was observed. Descriptors: Polyplumaria arenaria

Systematics, Taxonomy
Zoogeography, Biogeography (generalities), Geographic distribution

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