Overview

Comprehensive Description

Description

Travisia antarctica, new species

 

 

Records: 8:2 sta. 723 (2); 8:3 sta. 724 (1, TYPE); 15:5 sta. 600 (1).

 

 

Description: Length is 35 mm, width 11 mm, and segments number 28, of which the last 3 are asetigerous rings; this is followed by an anal cylinder. The surface epithelium is granular, most conspicuous in the anterior third of the body. The first setiger is preoral, biramous, and its setal fascicles are well separated from each other and slightly larger than those on the second segment. Branchiae are first present, but small, from the second setiger; they number 20 to 21 pairs and are largest in an­terior segments. Branchial segments are followed by three abranchiate setigerous segments, and these by four others without setae. The anal cylinder is slenderer than the body and surrounded by a circlet of short papillae.

 

Each segment is crossed by circlets of papillae, resembling closely strung beads. The first 16 or 17 segments are triannulate; their para­podia are on the third ring, which also has the largest papillae. The next six segments are biannulate, and the last five are uniannulate. Setae are entirely long, slender and capillary.

 

T. antarctica is unique for having 28 segments, of which 20 or 21 are branchial; the last 4 segments lack parapodia.

 

T. nigrocincta Ehlers, 1913 (see Hartman, 1966, p. 54) from Wil­helm II coast in abyssal depths, lacks branchiae and may belong to Kesun (see above).

 

 

Distribution: South Georgia, in 2663-2727 in; South Sandwich Is­lands, in 2452-2531 m.”

 

(Hartman, 1967)

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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Physical Description

Type Information

Holotype for Travisia antarctica Hartman, 1967
Catalog Number: USNM 56175
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol)
Collector(s): University of Southern California
Year Collected: 1963
Locality: South Georgia Island, east of island, Scotia Sea, South Atlantic Ocean
Depth (m): 2714 to 2727
Vessel: Eltanin R/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 27 specimens in 1 taxon.
Water temperature and chemistry ranges based on 11 samples.

Environmental ranges
  Depth range (m): 137 - 5289
  Temperature range (°C): -1.186 - 2.843
  Nitrate (umol/L): 25.713 - 33.442
  Salinity (PPS): 34.115 - 34.686
  Oxygen (ml/l): 4.942 - 6.730
  Phosphate (umol/l): 1.845 - 2.328
  Silicate (umol/l): 26.582 - 128.883

Graphical representation

Depth range (m): 137 - 5289

Temperature range (°C): -1.186 - 2.843

Nitrate (umol/L): 25.713 - 33.442

Salinity (PPS): 34.115 - 34.686

Oxygen (ml/l): 4.942 - 6.730

Phosphate (umol/l): 1.845 - 2.328

Silicate (umol/l): 26.582 - 128.883
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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