Overview

Comprehensive Description

Description

This colonial kamptozoan consists of numerous individual zooids that are connected basally by stolons. Each zooid is made up of a calyx and a stalk, measuring approximately 2 mm in total height. The cuplike calyx is ringed with ciliated tentacles; these tentacles roll inward when disturbed. Typically, each calyx is oriented obliquely relative to the stalk. Each stalk is composed of long, narrow rigid rods interspaced by one or more short, wide muscular nodes, allowing each zooid to bend. Stalk rods are distinguished by a lack of conspicuous pores. Basal stolons are thin and narrow, measuring 50 μm in diameter, and attach to a variety of substrates or other organisms.

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Source: Marine Invaders of the NE Pacific

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Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Barentsia benedeni is a cosmopolitan species. In the Northeast Pacific, the species has been recorded at several sites in California and Oregon, including the Salton Sea, Elkhorn Slough, San Francisco Bay, Lake Merritt, and Coos Bay. This species also has been collected from numerous locations around the world, including Europe, Japan, and Australia (Wasson 1997). Its native geographical range remains uncertain, but the species may have originated in Europe (Carlton 1978).

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Source: Marine Invaders of the NE Pacific

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Physical Description

Look Alikes

In the Northeast Pacific, Barentsia benedeni is most similar to B. parva (O'Donoghue & O'Donoghue, 1923).

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Source: Marine Invaders of the NE Pacific

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Ecology

Habitat

Depth range based on 4 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 16 - 21.6

Graphical representation

Depth range (m): 16 - 21.6
 
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Primarily found in bays and harbours.

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Source: Marine Invaders of the NE Pacific

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

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