Overview

Comprehensive Description

Remarks

Monotypic genus; not illustrated in Hartman (1967) and not recorded since.

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© Wilson, Robin

Source: Annelida LifeDesk

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Description

Prostomium anteriorly truncated. Buccal tentacles smooth, arranged in two lateral groups. Oral membrane elongate, smooth and folded. Prostomial dorsal glandular ridges absent. Branchiae 3 pairs. All branchiae similar, all smooth, none basally flanged. All branchial pairs arranged in a distinctly segmental fashion. Paleae on segment 3 absent. Dorsal crest absent. Nuchal (post branchial) hooks on segment 4 absent. Notopodia all similar. Notochaetae all smooth, present from segment 3. Neuropodia present, tori of similar length throughout thorax. Segments 3–6 without neurochaetae. Number of pairs of thoracic uncinigers 11. Abdominal notopodial rudiments present. Anal cirri present, 1 pair.

Description generated from: Hutchings, PA & Johnson, RT, 2003. Australian Ampharetidae (Polychaeta) DELTA database. In Wilson RS, Hutchings PA & Glasby CJ (eds) Polychaetes: Interactive Identification and Information Retrieval. CSIRO Publishing, Melbourne.

Additional references:
Hartman, O. 1969. Atlas of the Sedentariate Polychaetous Annelids from California. Fauchald, K. 1977. The polychaete worms. Definitions and keys to the orders, families and genera. Natural History Museum of Los Angeles County, Science Series 28, 1-188.

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© Wilson, Robin

Source: Annelida LifeDesk

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Description

"Genus Ampharana, new genus

 


Type Ampharana antarctica, new species

 

The body is long and linear. The thorax consists of 14 setigerous segments of which the last 11 are uncinigerous; the abdomen consists of about 25 segments and terminates in a pygidium with a pair of long, cirri-form processes. Paleae are absent. The prostomium is trilobed and lacks glandular areas; it consists of a broad median and a pair of lateral lobes. The oral cavity encloses a broad, folded membrane; it has lateral tufts of filiform papillae. Branchiae number three pairs; they are inserted on three successive segments; the anterior pair is widest apart, and the third pair is closest together; they leave a broad middorsum exposed. The first notosetae are on the first branchial segment. Thoracic setae are long and slender; thoracic uncini are avicular; each has teeth in two rows. Abdominal uncini are thick and compact, with terminal teeth in crested series.

 

Ampharana approaches Glyphanostomum Levinsen in having 14 thoracic setigerous segments, three pairs of branchiae and no paleae; it differs from the latter in having a large oral membrane with lateral tufts of long papillae ; thoracic uncini with two rows of teeth ; and thoracic setae first present from the first branchial pair.

 

Amythas Benham, 1921, also has an oral folded membrane, but it has 17 thoracic setigers, and three pairs of branchiae inserted on three suc­cessive segments; the first pair is nearest together, and more posterior pairs diverge medially. Amythasides Eliason also has three pairs of branchiae; it differs in having the branchiae inserted on an erect mem­brane; and notosetae are first present from the third branchial segment, and paleae are conspicuous."

 

(Hartman, 1967)

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© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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Distribution

Distribution within Australia: Not known from Australia.

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© Wilson, Robin

Source: Annelida LifeDesk

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Ecology

Habitat

Insufficient data.

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© Wilson, Robin

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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): 4575 - 4792
  Temperature range (°C): 0.281 - 0.332
  Nitrate (umol/L): 32.318 - 33.668
  Salinity (PPS): 34.698 - 34.714
  Oxygen (ml/l): 4.984 - 5.039
  Phosphate (umol/l): 2.198 - 2.303
  Silicate (umol/l): 114.185 - 137.188

Graphical representation

Depth range (m): 4575 - 4792

Temperature range (°C): 0.281 - 0.332

Nitrate (umol/L): 32.318 - 33.668

Salinity (PPS): 34.698 - 34.714

Oxygen (ml/l): 4.984 - 5.039

Phosphate (umol/l): 2.198 - 2.303

Silicate (umol/l): 114.185 - 137.188
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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