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Polychaeta source details

Rouse, Greg W. (1993). Amphiglena terebro sp. nov. (Polychaeta: Sabellidae: Sabellinae) from eastern Australia; including a description of larval development and sperm ultrastructure. Ophelia. 37(1): 1-18.
51598
10.1080/00785326.1993.10430373 [view]
Rouse, Greg W.
1993
<i>Amphiglena terebro</i> sp. nov. (Polychaeta: Sabellidae: Sabellinae) from eastern Australia; including a description of larval development and sperm ultrastructure
Ophelia
37(1): 1-18
Publication
AnnelidaBase
Available for editors  PDF available [request]
Amphiglena terebro sp. nov. (Polychaeta: Sabellidae) is described from eastern Australia. This species can be distinguished from the other three species of Amphiglena Claparède on the basis of the shape of thoracic uncini and notochaetae, the number of thoracic and abdominal chaetigers and overall size. Amphiglena terebro is a simultaneous hermaphrodite with oocytes in the anterior abdominal chaetigers and sperm and spermatids in the following abdominal chaetigers. Sperm have an elongate nucleus and long midpiece, The acrosome and nucleus spiral around each other at the tip of the sperm. Spermiogenesis occurs in large, synchronously developing masses connected to a cytophore. Throughout the year direct-developing larvae are brooded in the tube with the adult. Several larvae at different stages of development could be found in a tube at any one time. Early larvae are elongate ellipses (500 μm long) with a prominent prototroch and neurotroch. Larvae develop all 8 thoracic chaetigers with notochaetae and uncini but not companion chaetae. Abdominal chaetigers are then added. The larvae actively crawl at this stage. The radiolar crown develops after all thoracic, and several abdominal, segments are formed. Comparisons are made with other members of the Sabellinae and the evolution of reproductive mechanisms within the Sabellidae is discussed.
Australia
Larvae, Larval development, Metamorphosis
Reproduction
Systematics, Taxonomy
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2013-01-12 18:30:12Z
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2022-11-23 10:07:06Z
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Amphiglena terebro Rouse, 1993 (original description)