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  19 - 30  x (2.5)  3 - 4  20 3 / 3 unfired
Column
basitrichs (10.5)  13.5 - 21  x  2.2 - 3.2  68 9 / 9 unfired
Filaments
basitrichs  12 - 23  x  2 - 3.2  (3.7) 29 6 / 8 unfired
basitrichs  19 - 24  x (3)  3.5 - 4.8  38 8 / 8 unfired
microbasic p-mastigophores  16 - 26  x  3.5 - 5.2  (6) 51 8 / 8 unfired
Tentacles
basitrichs  9 - 14  x  2.2 - 2.8  7 3 / 9 unfired
basitrichs  18 - 25.5  x  2 - 3  54 9 / 9 unfired
holotrichs (16)  18 - 25.5  x  2.5 - 4  47 8 / 9 unfired
spirocysts  13 - 28  x  2 - 3.5  56 9 / 9 unfired
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Source: Hexacorallians of the World

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Biology/Natural History: Broods young internally.

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Source: Invertebrates of the Salish Sea

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This anemone has no acontia, no tubercles or major adherent material on the column. Neither oral disk nor pedal disk have radiating lines. There may be darker pigmented lines between the tentacles (as seen above), associated with the internal mesenteries. Broods young internally. Mid- to high intertidal, mostly in caves and surge channels shaded by logs. May be drab green, brick red, dark orange, or deep mustard; sometimes with lighter or darker spots. Note: Epiactis fernaldi has only been observed in the San Juan Archipelago. The only individuals in the sole known remaining population (photo) are 2 cm or less in diameter.
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Source: Invertebrates of the Salish Sea

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Distribution

Geographical Range: San Juan Islands

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Source: Invertebrates of the Salish Sea

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Physical Description

Type Information

Paratype for Epiactis fernaldi Dunn & Chia, 1986
Catalog Number: USNM 61273
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol); Slide
Collector(s): D. Dunn & L. Francis
Year Collected: 1979
Locality: San Juan Islands, San Juan Island, Cattle Point, Surge Channel, Washington, United States, North Pacific Ocean
  • Paratype:
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© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Look Alikes

How to Distinguish from Similar Species: Other local Epiactis species usually have radiating white lines on the oral disk and dark vertical lines on the column. Small Epiactis prolifera may look similar especially when closed (photo), but that species often has small young along its external column which are not seen in this species which broods internally.
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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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Ecology

Habitat

Depth range based on 8 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 0 - 0
  Temperature range (°C): 10.151 - 10.151
  Nitrate (umol/L): 6.725 - 6.725
  Salinity (PPS): 31.893 - 31.893
  Oxygen (ml/l): 6.561 - 6.561
  Phosphate (umol/l): 0.943 - 0.943
  Silicate (umol/l): 15.658 - 15.658
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Depth Range: Intertidal

Habitat: Caves and shaded surge channels

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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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