Overview

Comprehensive Description

Biology: Nematocysts

More info
LocationImageCnidae TypeRange of
Lengths (m)
Range of
Widths (m)
nNState
Fautin D. G. and Chia F. S., 1986
Actinopharynx
basitrichs  13 - 15  x  2 - 2.8  7 2 / 4 unfired
basitrichs  27 - 38  x  3.2 - 4.2  26 4 / 4 unfired
microbasic p-mastigophores  20 - 27  x  4.2 - 5.5  19 4 / 4 unfired
Column
basitrichs  17 - 23  x  2.5 - 3.5  40 6 / 6 unfired
Filaments
basitrichs  12 - 24  x  2 - 3.2  39 6 / 6 unfired
basitrichs  18 - 27  x  3.8 - 5.5  37 6 / 6 unfired
microbasic p-mastigophores  17 - 23  x  4 - 6  35 6 / 6 unfired
Tentacles
basitrichs  20 - 32  x  2.5 - 3.5  (4) 64 7 / 7 unfired
basitrichs  11 - 16  x  2.2 - 2.8  6 4 / 7 unfired
holotrichs  25 - 31  x  3 - 4.2  14 4 / 7 unfired
spirocysts  17 - 36  x  2.5 - 4  52 7 / 7 unfired
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© Hexacorallians of the World

Source: Hexacorallians of the World

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Biology/Natural History: Sexes are separate and reproduction is seasonal. This species broods its young externally. The brooded young appear to be all of similar age. Red, brown, and green females usually have pink young, while orange females usually have orange young.

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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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Like other Epiactis, this species has no acontia, its column has no tubercles, and its column is not white. This species often has fine radiating white lines on its oral disk which reach all the way to the mouth. Its column is reddish, greenish, purple, or orange and has fine dark lines all the way from the pedal disk to the top of the column, along the insertions of the internal mesenteries. The stripes look similar all the way up the column, with no distinctly contrasting color occurring at the base (limbus) of the column. It broods its young externally in a band several individuals deep, but the individuals are all of similar size (photo). Pedal disk to 8 cm diameter. The underside of the pedal disk (only visible when detached) has radiating orange or red lines.
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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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Distribution

Geographical Range: Bamfield, Vancouver Island, Canada to Coos Bay, OR

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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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Physical Description

Look Alikes

How to Distinguish from Similar Species: Epiactis fernaldi has no radiating white lines on the oral disk or on the column. The dark lines on the column of Epiactis prolifera do not continue above the middle of the column. The lines on the oral disk of Epiactis ritteri are broad and do not approach the mouth. Urticina crassicornis can have a similar mix of colors on the column but its tentacles have broad color bands and the colors on its column wall are broad blotches rather than fine vertical lines.
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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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Ecology

Habitat

Depth range based on 6 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 0 - 1068

Graphical representation

Depth range (m): 0 - 1068
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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