Comprehensive Description

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"Branchamphinome antarctica, new species


(Plate 12, Fig. A)



Records: 19:1 sta. 1346 (63); 19:2 sta. 1343 (337, TYPE); 19:3 sta. 1345 (5).



Description: The body measures 9 to 11 mm long, 4 to 6 mm wide and consists of 24 to 28 segments; it is broadest in the anterior third, and tapers toward both ends. Smaller individuals resemble the short Chloeia, whereas longer ones are more like Eurythoe. The prostomium is rectan­gular (Fig. A), wider than long, and has four large, circular, red eyes, with the anterior pair slightly the larger. The two pairs of frontal an­tennae are directed forward, and a longer median antenna is inserted far back, behind the eyes. A large, fleshy frontal projection, in front of the prostomium, may be turned up when the proboscis is somewhat everted.


The caruncle is tripartite, consisting of a larger, longer median lobe with lateral branches, and a pair of shorter, lateral lobes; all are in­serted behind the prostomium; the middle part overlaps the first and sec­ond segments. The first 2 segments are ventrally incomplete, and the third is the first complete ring. The posterior end is broadly rounded, with the pygidium semicircular or slightly excavate medially. The anal pore is terminal.


Parapodia are biramous. The first are directed forward, at the sides of the prostomium; each has a well developed dorsal cirrus, a large branchia with five or six lobes, a spreading setigerous fascicle and a ventral cirrus. Dorsal cirri are cirriform and annulated, each with four or five articles. The second parapodium resembles the first but is directed lat­erally. Typical parapodia have rami widely separated. In the anterior third of the body branchiae are bushy, in dorsal position, inserted just behind the notopodium, have up to 18 to 20 branches which emerge from a broad base. Notopodia have full tufts of nearly colorless, slender setae directed far laterally; most are slender, smooth, and long; a few are short, thick, spurred, with the distal end serrated along the cutting edge, the tips of serrations directed distally.


Neuropoclia have similar thick tufts of long, slender setae, and fewer, thicker, shorter, spinelike setae in which the tip is blunt and the cutting edge is serrated, with the tips of serrations directed basally.


The everted proboscis is subglobular, muscular, bounded at mid-length by a brown band; and a similar brown pigment covers the lower side of the prostomial facial tubercle.



Distribution: Pacific Antarctic Ridge, in 915-1153 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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