By Louis S. Kornicker

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Published through the yank Geophysical Union as a part of the Antarctic study Series.


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Biology of the Antarctic Seas XXI

Concerning the ProductPublished through the yank Geophysical Union as a part of the Antarctic examine sequence. content material:

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ParanorthiaantarcticaHamnan,1967a,p. 94, pl. 30. Paradiopatra abranchiata; Hartman, 1978, p. 24c,table 26. o Nothria near conchylega;Hartman, 1967a, p. ELT*/394). ;Hartman,1967a,p. ELT*/939). o o x 5 lO Material examined. ), ELTA25/364 (2), ELTA27/1855 (5), ELTA27/1939 (2), ELTA27/1948 (4), ELTA33/2166 (2), ELTA38/7-GR-1 (1), ELTA38/7-GR-5 (1). 15 SETIGER Other Antarctic and Subantarctic records. CHAL/298, CHAL/335, ELT*/135, ELT*/350, ELT*/469, ELT*/472, ELT*/921, ELT*/939, ELT*/ 1009, ELT*/1063, GLAC69/23, MENDE/1349.

Diagnosis. Peristomiumwithout tentacularcirri. Anteriorparapodiawith roundedor auricularpresetal lobes(Plate 10, figs. d, e; Plate 11, figs. d, e). Quill- like tubes. Remarks. The robes are cylindrical,more or less arcuate,with tough smoothwalls, andopenat bothends. Plate11. ) a. Anterior end, dorsal view. b. Anterior end, lateral view (midlateral antenna sectioned). c. Firstparapodium, posteriorview. d. Firstparapodium,anteriorview. e. Secondparapodium, anteriorview. f. Medianparapodium, anteriorview.

These setae are lost in adults. The larvaeprobablysurvivefor a while on theirreservematerials,but in oneof thema fecalpellet wasfoundwhichwas composedof the setaeof siblings of its own size. This indicates some cannibalism,or at leastscavenging on deadsiblings,before thejuvenilesleavethebroodtube. Distribution. Endemic to the South Shetland and SouthOrkneyislandsandadjacemareasof the southern Scotia Sea (Chart 1C), in upper slope areas (205-1437 m; average,506 m; n = 26). GenusDiopatra Audouinet Milne-Edwards,1833 Branchiae beginon setiger5 andcontinueto setigers 35-37.

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