Download PDF by : Biology of the Antarctic Seas XVI

ISBN-10: 087590193X

ISBN-13: 9780875901930

ISBN-10: 1118666577

ISBN-13: 9781118666579

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Published by means of the yank Geophysical Union as a part of the Antarctic examine Series.

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Wagin's [1968] original material of A. gigas supposedly came from the Kerguelen archipelago, but it actually seems to have been from the South Sandwich Islands (see the discussion section). He described females and males, noted two larval stages, and briefly discussed the biogeographic sig­ nificance. The present report comprises a redecription of A. gigas, with considerable additional information on its larval develop­ ment and ecology. Introduction The Ascothoracida are a subclass of maxillopodan crustaceans [Grygier, 1983b] that par- •'•Now at George Washington University Biostatistics Center, Bethesda, Maryland 20814.

146. Description Body form and size. Oral disc 35-50 mm across, much larger than pedal disc. Column devoid of ectoderm in most individuals; color of well-preserved specimens white; exposed mesoglea may be dirty grey; rare animals with easily deciduous cuticlelike layer. May be as long as oral disc is wide but generally only half that. Some specimens crumbly/brittle. Base. Generally elongate (up to 25-30 mm long), often appearing as if it had been wrapped around a small cylindrical object. Thin, golden-brown chitinous material closely applied to pedal disc of most specimens, apparently secreted by it.

Sosci Grygier from the abyssal Subantarctic Pacific, host un­ known. That species, however, has pairs of high, irregular frills on thoracomeres 2 and 3; short, setiform filamentary appendages; a 49 dissimilar, possibly movable antennular claw; and longer furcal setae [Grygier, 1983c]. The only species with filamentary appendages as large as those of A. gigas is A. brattstroemi Grygier, which parasitizes a basket star at Barbados and is otherwise wholly dissimilar [Grygier, 1983c]. Ascothorax gigas may be unusual for its genus in having seminal recep­ tacles in the second thoracopods [Grygier, 1983c], although this condition was also claimed for Arctic specimens of A.

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Biology of the Antarctic Seas XVI


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