Antarctic and Subantarctic Pycnogonida: Ammotheidae and by C. Allan Child

By C. Allan Child

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Published by means of the yankee Geophysical Union as a part of the Antarctic learn Series.

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Sample text

T h e ovigers and palps are typical. T h e propodus is only slightly curved, is short, has n o major heel spines, and has a long well-curved main claw w h i c h lacks any auxiliary c l a w s . Remarks. W e r e it not for the great length and placement o f the cement gland tubes o f this species, it w o u l d almost certainly have been named as an Ascorhynchus. S o m e o f the smaller species o f Ascorhynchus, particularly several o f the many Japa­ n e s e forms, h a v e similarly placed cement glands with a single pore or tube, but the cement gland openings are all, where they are k n o w n , rather small and inconspicuous and not the tall truncate cones o f this and o f several others Cilunculus species.

Material examined. Burton Island: sta. 5 (one specimen). Eltanin: 2 7 - 1 8 8 5 (one specimen), 3 2 - 2 0 4 5 (one specimen), 3 2 - 2 0 7 2 (one specimen), 5 1 - 5 7 7 6 (one specimen). Hero: 6 9 1 - 2 7 ( o n e specimen). Distribution. T h e few scattered records for this species make its k n o w n distribution from South Georgia, South Shetlands Islands, Antarctic Peninsula, and R o s s Sea and at about 140 ° E at depths o f 5 0 - 4 3 9 m. T h e a b o v e records add nothing n e w to this distri­ bution except to extend the depth to 5 6 9 m at o n e R o s s Sea station.

Trunk with 3 slender segmentation ridges bearing small conical dorsomedian tubercles. Lateral processes typical. Ocular tubercle taller than trunk cones, eyes small. Proboscis l o n g , narrow, styliform. A b d o m e n erect. Chelifores short, chelae atrophied, carried anaxially. Palps extremely small, slender, from 7 to 9 segments, only about half proboscis length. L e g s w i t h fields o f very short setules, propodus short, curved, with 2 l o n g heel spines and short tiny sole spinules, auxiliaries short.

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