Overview

Brief Summary

Remarks: SEGONZAC (1992) reported Parasicyonis ingolfi CARGREN, 1942 from Snake Pit, Mid-Atlantic Ridge. This species was described before the discovery of hydrothermal vents. Despite of that report, there is no formal morphological description of this poorly known species from Mid-Atlantic Ridge material. At present, all other material subsequently studied from the Mid-Atlantic Ridge corresponds with the description of Maractis rimicarivora. Although Parasicyonis ingolfi was included in the first edition of the Handbook of deep-sea hydrothermal vent fauna (DESBRUYÈRES & SEGONZAC 1997), at present, we decided not to include this species until new material will be studied.
  • BEL?TENEV V., IVANOV V., SHAGIN A. et al. (2005) InterRidge News 14: 14-16

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Comprehensive Description

Biology: Nematocysts

More info
LocationImageCnidae TypeRange of
Lengths (m)
Range of
Widths (m)
nNState
Fautin D. G. and Barber B. R., 1999
Actinopharynx
basitrichs  23.4 - 34.9  x  2.3 - 3.2  9 3 / 4 Unfired
microbasic p-mastigophores  28.6 - 42.1  x  4.1 - 5.2  (5.7) 31 3 / 4 Unfired
Column
basitrichs  19.5 - 31.5  x  1.9 - 3.9  (4.9) 71 5 / 5 Unfired
microbasic p-mastigophores  21.3 - 31.9  x  3.4 - 6.2  54 4 / 5 Unfired
Filaments
basitrichs  16.1 - 34.1  (45.1) x  1.8 - 4.5  61 5 / 5 Unfired
microbasic p-mastigophores  26.9 - 38.9  (43.1) x  3.3 - 5.7  (6) 61 5 / 5 Unfired
Tentacles
basitrichs (15.6)  17.2 - 25.5  x  1.6 - 2.9  54 5 / 5 Unfired
basitrichs  31 - 48.4  (54.6) x  2.5 - 3.8  50 5 / 5 Unfired
basitrichs (16.8)  19.2 - 43.4  x  1.9 - 3.8  74 5 / 5 Unfired
holotrichs  30.4 - 53.9  x  4.5 - 6.4  39 5 / 5 Unfired
spirocysts  30 - 78.5  x  2.8 - 7.3  (7.8) 91 5 / 5 Unfired
spirocysts  30.3 - 64.1  x  2.9 - 6.9  (8.1) 85 5 / 5 Unfired
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© Hexacorallians of the World

Source: Hexacorallians of the World

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Color: Column, tentacles, pharynx and mesenteries yellowish white in situ.
  • BEL?TENEV V., IVANOV V., SHAGIN A. et al. (2005) InterRidge News 14: 14-16

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As other sea anemones, probably feeds on caught prey, with a relative wide prey size-range. This species was reported preying on shrimps Rimicaris exoculata. All other biological aspects are unknown. Observed in peripheral regions of active black smokers, attached to the crumbly substratum of oxidized sulfide.
  • BEL?TENEV V., IVANOV V., SHAGIN A. et al. (2005) InterRidge News 14: 14-16

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Distribution

Mid-Atlantic Ridge: TAG, Snake Pit-Elan, and Ashadze 1.
  • BEL?TENEV V., IVANOV V., SHAGIN A. et al. (2005) InterRidge News 14: 14-16

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Physical Description

Morphology

Column conical in contraction, with transversal furrows due to contraction; sphincter mesogloeal, strong; tentacles about 100 in number, closely placed at the rim; longitudinal musculature of tentacles ectodermal; no mastigophore nematocysts in tentacles; mesenteries hexamerously arranged, but not according Actinostola-rule; equal number of mesenteries distally and proximally, 4 cycles, only the first cycle perfect, all stronger mesenteries fertile; parietobasilar musculature only differentiate in the stronger cycles.
  • BEL?TENEV V., IVANOV V., SHAGIN A. et al. (2005) InterRidge News 14: 14-16

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Size

Diameter of the pedal disc, up to 55 mm; mouth, up to 30 mm; column height, up to 20 mm; length of contracted tentacles, up to 25 mm.
  • BEL?TENEV V., IVANOV V., SHAGIN A. et al. (2005) InterRidge News 14: 14-16

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Type Information

Paratype for Maractis rimicarivora Fautin & Barber, 1999
Catalog Number: USNM 100132
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol); Slide
Year Collected: 1994
Locality: Trans Atlantic Geotraverse; From Hydrothermal Vent, North Atlantic Ocean
Depth (m): 3650 to 3650
  • Paratype: Fautin, D. G. & Barber, B. R. 1999. Proc. Biol. Soc. Wash. 112(3): 624-631, figs.1-4.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Ecology

Habitat

at hydrothermal vents
  • UNESCO-IOC Register of Marine Organisms
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Depth range based on 11 specimens in 1 taxon.
Water temperature and chemistry ranges based on 11 samples.

Environmental ranges
  Depth range (m): 3490 - 4150
  Temperature range (°C): 2.261 - 2.651
  Nitrate (umol/L): 21.196 - 22.257
  Salinity (PPS): 34.890 - 34.926
  Oxygen (ml/l): 5.652 - 5.734
  Phosphate (umol/l): 1.442 - 1.496
  Silicate (umol/l): 37.669 - 45.538

Graphical representation

Depth range (m): 3490 - 4150

Temperature range (°C): 2.261 - 2.651

Nitrate (umol/L): 21.196 - 22.257

Salinity (PPS): 34.890 - 34.926

Oxygen (ml/l): 5.652 - 5.734

Phosphate (umol/l): 1.442 - 1.496

Silicate (umol/l): 37.669 - 45.538
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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