224 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 105 



I. BARENTSIA DISCRETA 



Plates 1, 2 



The only entoproct collected by the U. S. Navy's 1947-48 Ant- 

 arctic Expedition was Barentsia discreta (Busk, 1886) from Marguerite 

 Bay, off Palmer Peninsula, Antarctica, a new locality for the species 

 and its southernmost record to date. The Barentsia specimens were 

 unusually large and robust. 



In this paper O'Donoghue's B. robusta and Johnston and Angel's 

 B. intermedia and B. antarctica are considered to be synonyms of B. 

 discreta and to be similar in measurements to the Alarguerite Bay 

 specimens. Ecological and distributional data from almost all the 

 taxonomic papers on this species have been extracted and brought 

 together here. The species has an extraordinary range in latitude 

 and longitude, being found in Tropic, Temperate, and Frigid Zones and 

 from the Arctic to the Antarctic, from lat. 77°53' N. to lat. 68°30' S. 

 The colder water specimens are larger and more robust in almost 

 every particular than those found in warmer waters. Measurements 

 are given for various structures of the Marguerite Bay specimens. 

 The Marguerite Bay specimens gi-ew on hydroid stems and on the 

 bryozoans Cellarinella and Phylactella lyrvlata. 



Taxonomy and Morphology: The partial synonomy of Barentsia 

 discreta, which belongs to the family Pedicellinidae, is as follows: 



Ascopodaria discreta Busk 1886, p. 44. 



Pedicellina australis Jullien 1888, p. 13. 



Ascopodaria macropus Ehlers 1890, p. 143. 



? Barentsia misakiensis Oka 1895, p. 81. 



Barentsia timida Verrill 1900, p. 594. 



Ascopodaria macropus Robertson 1900, p. 345. 



Barentsia discreta Waters 1904, p. 99. 



Barentsia robusta O'Donoghue 1924, p. 21. 



Barentsia intermedia Johnston and Angel 1940, p. 225. 



Barentsia antarctica Johnston and Angel 1940, p. 226. 



Ascopodaria discreta Kluge 1946a, p. 150. 



Oka's B. misakiensis has long been considered a synonym for B. 

 discreta by most able workers, although the seeming linear regularity 

 of the stalk pores of his figure 2 is a bit disquieting. 



O'Donoghue's B. robusta and Johnston and Angel's B. intermedia 

 and B. antarctica are merely variable individuals of B. discreta, not 

 separate species or even new varieties, A close study of their meas- 

 urements, descriptions, and illustrations does not reveal any valid or 

 fixed character on which to retain them as new species. Their meas- 

 urements fall within the range for B. discreta, their appearance agrees 



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