IUCN threat status:

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Comprehensive Description

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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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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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