Overview

Brief Summary

Biology

Hydrothermal vents
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Remarks: There is no information concerning the internal soft organs. Due to the similarities or even possible identities of hard parts in different species (two new species are under description), the conspecifity of specimens far off the type locality (see distribution) needs to be confirmed according to internal organisation. See also H. juani.
  • SCHELTEMA A.H. (2000) Argonauta XIV(2): 15-25.

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Distribution

East Pacific Rise: 21°N (type locality), 17°24?S; Galapagos Spreading Center.
  • SCHELTEMA A.H. (2000) Argonauta XIV(2): 15-25.

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Physical Description

Morphology

Solenogastres of cylindric body somewhat tapering at both ends, posterior end bluntly rounded and somewhat flattened dorsoventrally; appearance similar to H. juani, but shorter and fuzzier. Dominant sclerites slender and up to 190 ?m long with distal end rounded, in part with distal swelling; dorsofrontal sensory pit often obvious as transverse slit. Radula in sheath distinctly bipartite, paired ventral radula sack at end curved; radula plates with 5-7 denticles, the lateral-most distinctly longer and close to next one. Paired copulatory stylet apparatus with two elements each.
  • SCHELTEMA A.H. (2000) Argonauta XIV(2): 15-25.

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Size

Up to 3 mm.
  • SCHELTEMA A.H. (2000) Argonauta XIV(2): 15-25.

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Type Information

Holotype for Helicoradomenia acredema Scheltema, 2000
Catalog Number: USNM 905276
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol); Slide
Collector(s): Woods Hole Oceanographic Institution
Year Collected: 1982
Locality: East Pacific Rise 21 N,, Mexico, North Pacific Ocean
Depth (m): 2618 to 2618
Vessel: Alvin DSR/V
  • Holotype: Scheltema, A. H. 2000. Two New Hydrothermal Vent Species, Helicoradomenia bisquama and Helicoradomenia acredema, from the Eastern Pacific Ocean (Mollusca, Aplacophora). Argonauta. 14 (2): 15-25.
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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Paratype for Helicoradomenia acredema Scheltema, 2000
Catalog Number: USNM 905278
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol)
Collector(s): Woods Hole Oceanographic Institution
Year Collected: 1982
Locality: East Pacific Rise, Clam Acres, Baja California, Mexico, North Pacific Ocean
Depth (m): 2618 to 2618
Vessel: Alvin DSR/V
  • Paratype: Scheltema, A. H. 2000. Two New Hydrothermal Vent Species, Helicoradomenia bisquama and Helicoradomenia acredema, from the Eastern Pacific Ocean (Mollusca, Aplacophora). Argonauta. 14 (2): 15-25.
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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Paratype for Helicoradomenia acredema Scheltema, 2000
Catalog Number: USNM 905277
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol); Slide
Collector(s): Woods Hole Oceanographic Institution
Year Collected: 1982
Locality: East Pacific Rise, Clam Acres, Baja California, Mexico, North Pacific Ocean
Depth (m): 2618 to 2618
Vessel: Alvin DSR/V
  • Paratype: Scheltema, A. H. 2000. Two New Hydrothermal Vent Species, Helicoradomenia bisquama and Helicoradomenia acredema, from the Eastern Pacific Ocean (Mollusca, Aplacophora). Argonauta. 14 (2): 15-25.
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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Paratype for Helicoradomenia acredema Scheltema, 2000
Catalog Number: USNM 905279
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Slide
Collector(s): Woods Hole Oceanographic Institution
Year Collected: 1979
Locality: Galapagos Rift, Mussel Bed, Galapagos Islands, Ecuador, North Pacific Ocean
Depth (m): 2490 to 2490
Vessel: Alvin DSR/V
  • Paratype: Scheltema, A. H. 2000. Two New Hydrothermal Vent Species, Helicoradomenia bisquama and Helicoradomenia acredema, from the Eastern Pacific Ocean (Mollusca, Aplacophora). Argonauta. 14 (2): 15-25.
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

Depth range based on 6 specimens in 1 taxon.
Water temperature and chemistry ranges based on 6 samples.

Environmental ranges
  Depth range (m): 2490 - 2618
  Temperature range (°C): 1.827 - 2.075
  Nitrate (umol/L): 38.813 - 39.491
  Salinity (PPS): 34.663 - 34.668
  Oxygen (ml/l): 2.461 - 2.463
  Phosphate (umol/l): 2.754 - 2.785
  Silicate (umol/l): 155.611 - 161.139

Graphical representation

Depth range (m): 2490 - 2618

Temperature range (°C): 1.827 - 2.075

Nitrate (umol/L): 38.813 - 39.491

Salinity (PPS): 34.663 - 34.668

Oxygen (ml/l): 2.461 - 2.463

Phosphate (umol/l): 2.754 - 2.785

Silicate (umol/l): 155.611 - 161.139
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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