Remarks: DOUMENC & VAN PRAËT (1986) discussed the possible specific identity of the single specimen examined without a definitive conclusion. Although in the figure 1 of that paper, the name A. callosa is included, it was probably a mistake during the editorial process of the manuscript. DOUMENC & VAN PRAËT (1986: 63) also reported the presence of four cycles of tentacles, this number of cycles corresponding to 48 tentacles (6+6+12+24). However, the number of tentacles seen in the in situ photographs suggest five cycles. Additional material is needed to study the specific pertinence and other anatomical details.

Color: Column, tentacles, pharynx, and mesenteries yellowish white in situ.

As other sea anemones, probably feeds on caught prey, with a relative wide prey size-range. All other biological aspects are unknown. Often observed within the gravel, attached at the top of lava pillars.

East Pacific Rise: 13°N.

Column cylindrical, with conspicuous mesogloeal tubercles arranged regularly in longitudinal rows; tentacles arranged in four or five cycles, with an apical orifice, aboral side of tentacles often thickened at the base; sphincter weak, mesogloeal, thus tentacles can not be completely retracted; longitudinal musculature of tentacles mesogloeal; mesenteries arranged according to Actinostola-rule; oldest cycles of mesenteries sterile.

Diameter of the pedal disc, 90 mm; mouth, 70 mm; column height, 60 mm; length of contracted tentacles, 11 mm.

Depth range based on 320 specimens in 14 taxa.
Water temperature and chemistry ranges based on 198 samples.

Environmental ranges
  Depth range (m): 1.5 - 2915
  Temperature range (°C): -1.221 - 18.888
  Nitrate (umol/L): 0.916 - 42.548
  Salinity (PPS): 29.438 - 35.912
  Oxygen (ml/l): 0.369 - 9.158
  Phosphate (umol/l): 0.189 - 3.120
  Silicate (umol/l): 0.981 - 160.712

Graphical representation

Depth range (m): 1.5 - 2915

Temperature range (°C): -1.221 - 18.888

Nitrate (umol/L): 0.916 - 42.548

Salinity (PPS): 29.438 - 35.912

Oxygen (ml/l): 0.369 - 9.158

Phosphate (umol/l): 0.189 - 3.120

Silicate (umol/l): 0.981 - 160.712
 
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