Description:-

The body is 22.5mm long and 5mm wide including parapodia and has 32 segments. The entire body is dark grey when preserved in formalin. Both dorsal and ventral surface of the body are somewhat convex. Prostomium is round dorsally and disproportionately small for a body. The caruncle is small and cordate. The two lateral antennae are situated at the anterior border of prostomium. The median antenna arise from the anterior margin of the caruncle. All three antennae are short. The branchiae occur from the 3rd setigerous segment to the end of the body. They have the form of a dense bush of filaments. The dorsal cirrus is situated at the posterior to the dorsal setae and extends nearly to the tip of the dorsal setae. The ventral cirrus is very short, similar to the dorsal cirrus. The dorsal setae include simple capillaries with serrated tip and thicker harpoon setae with lateral fangs. Ventral setae are short and stout; their tips are strongly curved, the number 5 to 7 in a fascle. Aciculum with a knobbed end.

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Remark:-

Habitat:-

Synonyms:-

Amphinome (Plerone) tetraedra (Bruguière, 1789)
Amphinome lepadis Verrill, 1885
Amphinome luzoniae Kinberg, 1867
Amphinome natans Kinberg, 1867
Amphinome pallasii Quatrefages, 1866
Amphinome quatrefagesi Kinberg, 1867
Amphinome tetraedra Bruguière, 1789
Aphrodita rostrata Pallas, 1766
Asloegia capillata Kinberg, 1867
Colonianella rostrata Kinberg, 1867
Pleione tetraedra (Bruguière, 1789)

References:-

WoRMS (2014). Amphinome rostrata (Kinberg, 1867). In: Read, G.;Fauchald, K. (Ed.) (2014) World Polychaeta database. Accessed through:World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=129825 on 2015­01­22

Rho, Boon-Jo and Lee, Jong-Wui. 1987. A Systematic Study on the Errantiate Polychaetes in Korea. In: The Korean Journal of Systematic Zoology.Vol.3. No.1:74-90