Comprehensive Description

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"Ampharana antarctica, new species



Records: 18: 8 sta. 916 (3); 8:10 sta. 1154 (4);


18:12 sta. 913 (2, TYPE); 18:13 sta. 1146 (3+); 18:14 sta. 1150 (1) 18:15 sta. 1158 (1).



Description: Tubes are large, long and measure 180 mm long by 5 mm wide; they are externally covered with light tan silt and internally lined with an easily torn, white, parchmenty membrane. The enclosed in­dividual is much smaller, measures about 45 mm long by 3.5 mm wide in the anterior thoracic region, and consists of 14 thoracic and 25 ab­dominal segments; the last 12 segments are very short and taper to the slender pygidium, which has a pair of long, lateral cirriform processes.


The prostomium is a conspicuous, broad, flat lobe consisting of a median part which is wider than long; a partly encircling fleshy ridge encompasses the median lobe on posterior and lateral sides. The entire lobe overhangs the large, oral cavity which encloses the folded mem­brane with its paired lateral tufts. There are no eyes and no glandular ridges. The peristomium or first segment is complete, narrowest on its dorsal side and widest ventrally where it forms a fleshy lower lip. The second segment is the first branchial and the first setigerous one.


The three pairs of branchiae are of one kind, free to the base; each is smooth, broadest at the base and tapers distally to extend forward well beyond the cephalic region. The first pair is inserted laterally, immediately within the first pair of notopodia ; the second pair is slightly more dorsal, within the second pair of notopodia ; and the third pair is most medial ; all leave a broad dorsum exposed.


Notopodia are smallest in front; the fascicles increase in size farther back. Uncinigerous ridges arc first present from the fourth setigerous segment and number 11 pairs. The first three parapodial segments are short; each has slender fascicles of setae. Segments five to eight are much longer and have thicker, longer setal tufts; farther back the segments are longer and slenderer through the thoracic region. Abdominal para­podia have simple, uncinigerous ridges in the first six long segments; they are followed by increasingly shorter segments with a dorsal papilla, which is situated well above the torus; they continue to the posterior end of the body.


Thoracic uncini are short, avicular; each has curved teeth in two parallel rows, and each row has five or six teeth. Abdominal uncini are shorter, more compact; each has a large basal tooth surmounted by four smaller teeth in a curved row, and these by still smaller teeth in two rows; the total number of teeth exceeds 12 arranged in three or more transverse rows. Abdominal tori have about 18 uncini in a row.


Distribution: Limited to Mid-Pacific Basin, in abyssal depths, to 4813 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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