Overview

Comprehensive Description

Description

"Ammotrypane setigera n. sp.
Figs. 30a, 30b

 

Material. Weddell Sea, in 1664-4757 m: Station 68-18 (1 specimen); 68-55 (1 specimen); 69-19 (1 specimen); 69-21 (39 specimens); 69-22 (holotype and 7 paratypes, USNM 46894-5); 69-23 (16 speci­mens); 69-26 (2 specimens); 69-27 (2 specimens).

 

Description. The holotype (USNM 46894) is 29 mm long and 2 mm wide for 37 setigers. Other speci­mens, from station 69-21 (USNM 46899), are 17-40 mm long and 1.5-3.3 mm wide and consist of 32-43 setigers. Smaller individuals have fewer setigers, ranging from 30 to 33; in other respects they resem­ble the larger ones.

 

The prostomium has a slender anterior palpode (Figure 30a) and is long and oval or broadly tra­pezoidal; the shape varies according to the position of the nuchal organs and the proboscis. When the prostomium is withdrawn, it is oval; when it is everted, it is trapezoidal (Figure 30a). The achaetous peristomium is a long smooth ring, inter­mediate in width between the prostomium and first setigerous segment. The parapodia of the first setiger are postoral and smaller than those of subse­quent setigers.

 

Setigers 1-7 are broadest and quadriannulate and have the second, or largest, annulus bearing the lateral parapodia, with numerous long setae in biramous fascicles directed laterally. Setigers 9-17 to 19 are narrower and longer; the last 16 setigers are short and crowded. All parapodia have long fleshy postsetal lobes and similar but shorter presetal ones (Figures 30a, 30b). Setae are of one kind, long, slender, capillary, and marginally smooth.

 

A specimen from station 69-21 (USNM 46899) has the proboscis everted; it is long, smooth, and

 

Pouchlike and has a midventral longitudinal furrow. Branchiae are long a cirriform and present from setiger 2 to at least setiger 25; thereafter, they are irregular or absent. The last 16 setigers and their parapodia diminish gradually posteriorly (Figure 30b). The anal funnel is compressed, cylindrical, and longest middorsally; the distal margin is encircled by 12-14 short digitate processes (Figure 30b)

 

Remarks. Ammotrypane setigera is distinguished from other species of Ammotrypane by having the first seven setigers with the most conspicuous setal fascicles."

 

(Hartman, 1978)

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 Ammotrypane setigera Hartman, 1978
Catalog Number: USNM 46894
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol)
Collector(s): University of Connecticut
Year Collected: 1969
Locality: Coats Land, Antarctica, Weddell Sea, Antarctic Ocean
Depth (m): 3111
Vessel: Glacier II 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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Paratype for Ammotrypane setigera Hartman, 1978
Catalog Number: USNM 46895
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol)
Collector(s): University of Connecticut
Year Collected: 1969
Locality: Coats Land, Antarctica, Weddell Sea, Antarctic Ocean
Depth (m): 3111
Vessel: Glacier II R/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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Ecology

Habitat

Depth range based on 9 specimens in 1 taxon.
Water temperature and chemistry ranges based on 8 samples.

Environmental ranges
  Depth range (m): 1622 - 4483
  Temperature range (°C): -0.553 - -0.060
  Nitrate (umol/L): 30.362 - 33.484
  Salinity (PPS): 34.643 - 34.666
  Oxygen (ml/l): 5.080 - 5.877
  Phosphate (umol/l): 2.100 - 2.358
  Silicate (umol/l): 117.273 - 126.900

Graphical representation

Depth range (m): 1622 - 4483

Temperature range (°C): -0.553 - -0.060

Nitrate (umol/L): 30.362 - 33.484

Salinity (PPS): 34.643 - 34.666

Oxygen (ml/l): 5.080 - 5.877

Phosphate (umol/l): 2.100 - 2.358

Silicate (umol/l): 117.273 - 126.900
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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