Download PDF by George A & Wallen, I Eugene (Eds) Llano: Biology of the Antarctic Seas IV

By George A & Wallen, I Eugene (Eds) Llano

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Published via the yankee Geophysical Union as a part of the Antarctic examine Series.

Of the volumes at the moment to be had within the Antarctic study sequence, this quantity is the fourth facing the biology of the antarctic seas. those accumulated papers contain the result of unique investigations, eleven of that are involved generally with the identity and distribution of marine vegetation and animals. within the first of those papers Stewart Springer provides a scientific appraisal of the 5 species of elasmobranch Rajidae from Antarctica, of which one represents a brand new and special species. Heretofore one of many peculiarities of the antarctic ichthyological fauna has been the absence of sharks. during this very major contribution, the writer establishes the main southerly checklist for any member of the elasmobranchs. the second one paper, through Patricia Kott, amplifies our systematic wisdom of the tunicates of the South Atlantic, South Pacific, and Indian oceans. It extends her monograph released as quantity thirteen of the examine sequence below the identify of Antarctic Ascidiacea and is predicated on collections made within the Antarctic via 1967; new species are integrated. Additions and corrections to quantity thirteen are appended to this paper. John C. Markham stories on numerous decrease chordates of the genus Cephalodiscus and discusses the systematics and distribution of the 5 species recognized from the Antarctic. The Deep Freeze fabrics tested during this research have been received during the U.S. army Hydrographic workplace oceanographers from icebreakers assigned to job strength forty three ahead of and after the 1955-1959 overseas Geophysical 12 months and precede the nationwide technology beginning subsidized study now being performed through the USNS Eltanin and the R/V Hero below the U.S. Antarctic study software.

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Muscles fromthe dorsalpart P. constellatum fromthe Indian,Pacific,andAtlantic of the branchialsiphonextendalongthe atrial lip. It terminatesin a easternAustraliain the presenceof a brood pouch, crenellated tip. Rounded papillaearepresent the smallerzooid,andby the medianampullaein the on the transverse vessels, about4 corresponding to larvaeof theAustralianspecies. each3 stigmata. The stomachis roundedand smooth, In addition to the present species,P. cerebrale, and the rectum terminates about halfway up the P.

17 25 slightly fewer than in speciesfrom more shallow of testislobes posteriorto the ovary in the saclike waters, but this is not considereda characteristic posterior abdomen,which is constrictedoff from the sufficientto justify a separatespecies. About five developingembryosare present in a pouch from the posterior half of the thorax. Subfamily19OLYCLININAE Adamsand Adams This pouch appearsto be a true brood pouch, acPolyclinum sluiteri Brewin commodatinga loop of the oviduct, rather than a simple expansionof the oviduct in the peribranchial Figs.

There are 7a/• coils of vas deferensand a 3 medianpapillae. singleundividedtestislobe. 9 mm Copyright American Geophysical Union Antarctic Research Series Biology of the Antarctic Seas IV ANTARCTIC ASCIDIACEA II Vol. 17 35 long) and have otolith, ocellus,4 pairs of lateral thick basal test with shallow secondarycanals at ampullae,and the usual3 medianpapillae. thoraciclevel. Zooidsare of usualform with a wide Remarks. Thisappears tobea fairlycommon species atrialaperture; thereare,however, only6 large, offPortobello MarineStation, Otago Harbour (R.

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