Overview

Brief Summary

Remarks: (1) The illustration of the parapodium in the original description of O. platykephale (BLAKE 1985: Fig. 14C) was shown upside down and misinterpreted. This error was later noted by BLAKE & HILBIG (1990) and corrected by SOLÍSWEISS & HILBIG (1992). The original figure has been corrected here. (2) A closely related morphotype of O. platykephale is present in the same samples from the Guaymas basin hydrothermal mounds. It differs externally from O. platykephale having a peristomium with two achaetous rings and a globose dorsal cirrus (see Fig. 2-6). Its mandibles differ also from O. platykephale being more spindly and curved. Its specific status remains to be discussed (likely morphological variants or different stages of O. platykephale).
  • BLAKE J.A. (1985) Bull. Biol. Soc. Wash. 6: 67-101.

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Comprehensive Description

Living specimens of O. platykephale were observed swimming among a colony of the ampharetid Amphisamytha galapagensis. The general habitat was of a seep site warmed by percolating hot water, but away from chimneys.
  • BLAKE J.A. (1985) Bull. Biol. Soc. Wash. 6: 67-101.

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Distribution

Guaymas Basin hydrothermal mounds.
  • BLAKE J.A. (1985) Bull. Biol. Soc. Wash. 6: 67-101.

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Physical Description

Morphology

Body dorsoventrally compressed throughout, thickest anteriorly; posterior segments appearing ragged from projecting parapodia. Color in life and alcohol opaque white. Prostomium flattened, wider than long, with cirriform, distally tapering antennae and palps, both of similar length; eyes absent. Peristomium with single achaetous ring. Uniramous parapodia projecting far away from body, with pre- and postchaetal lobes short and rounded anteriorly, becoming elongate by about chaetiger 15. Dorsal cirri from chaetiger 17-19, becoming long, digitiform, bifid in posterior chaetigers. Ventral cirri short, retractile from chaetiger 3 to end of body. Dorsal branchiae from chaetiger 14; ventral branchiae from chaetiger 2; ventral branchiae longer than dorsal ones. Large parapodial glands present between dorsal cirrus and dorsal parapodial base. Chaetae include dorsal fascicle of simple spines and ventral fascicle of compound spinigers. Maxillae with large P-type forceps and seven pairs of free denticles.
  • BLAKE J.A. (1985) Bull. Biol. Soc. Wash. 6: 67-101.

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Size

Up to 40 mm long, 2.5 mm wide, with more than 150 segments.
  • BLAKE J.A. (1985) Bull. Biol. Soc. Wash. 6: 67-101.

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Type Information

Paratype for Ophryotrocha platykephale Blake, 1985
Catalog Number: USNM 81838
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: Guaymas Basin Southern Trough, Hydrothermal Mounds, E Of South Hill, Mexico, North Pacific Ocean
Depth (m): 2020 to 2030
Vessel: Alvin DSR/V
  • Paratype:
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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Holotype for Ophryotrocha platykephale Blake, 1985
Catalog Number: USNM 81837
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: Guaymas Basin Southern Trough, Hydrothermal Mounds, E Of South Hill, Mexico, North Pacific Ocean
Depth (m): 2020 to 2030
Vessel: Alvin DSR/V
  • Holotype:
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 4 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 2000 - 2025

Graphical representation

Depth range (m): 2000 - 2025
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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