Comprehensive Description

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Colossendeis megalonyx Hoek, 1881. (Figs. 7, 8, 10-23)



Colossendeis megalonyx Hoek 1881: 67; IX 1-3. Calman 1915b: 15-16. Helfer and Schlottke 1935: 293. Fage 1956: 177-8.


Colossendeis frigida Hodgson 1907: 63; IX 3, X 5-6. Calman 1915b: 17-18. Loman 1923: 7. Gordon 1932: 16-17; 5a, 6a, d, d’, 7d. Helfer and Schlottke, 1935: 293. Gordon 1944: 10. Fage 1956.


Colossendeis rugosa Hodgson 1907: 64; IX 4, X 7. Calman 1915b: 16-17. Gordon 1932: 12, 17. Helfer and Schlottke, 1935: 293.


Colossendeis orcadense Hodgson 1908: 184. Helfer and Schlottke 1935: 294.


Colossendeis scoresbii Gordon 1932: 18-21; 5c, 6b, b’, c, c’, 7a, b.


Colossendeis orcadensis Stock 1963: 334, 7.






PROBOSCIS SHAPE: B’’’: 1 or 2 : E’’’






NS: SP : MF : N/P


A B n=2 to 6 in adults



During growth, the area n in juveniles passes through stages when n=1, and n=2. In C. m. arundorostris, the juvenile state n = 2 is apparently retained in maturity, as in C. m. scoresbii.



GENITAL PORES: There appear to be two distinct types of pore on the ventral surface of the 2nd coxae of all legs, and these two types never occur together on the same specimen. The first type is smaller, borne on a small, low protuberance. In specimens where the integument is fairly transparent, a duct may be seen passing from this pore, through the protuberance, parallel for a short distance with the segment’s circumference, before bending sharply inwards.



The second type of pore is large in relation to the width of the coxa, and is not borne on a protuberance. No such configuration of the duct, as in the first type is visible. The duct appears shorter, and runs from the pore diametrically into the lumen of the coxa.



The first type is the male orifice; the second, the female.



RECORDED DISTRIBUTION: -- Throughout Antarctic and subantarctic waters, between 7 and 5,000 m; also as far north as Madagascar, taken only below 3,000 m.” (Fry & Hedgpeth 1969, p. 29-30)


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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