FUNCTIONAL MORPHOLOGY AND DEVELOPMENT OF SEGMENTAL INVERSION IN SABELLID POLYCHAETES

Autor:	N. J. Berrill
Rok vydání:	1977
Předmět:	biology Form and function Functional morphology Sabella Giant axon Thorax (insect anatomy) Inversion (evolutionary biology) Microphthalma Anatomy General Agricultural and Biological Sciences biology.organism_classification Autotomy
Zdroj:	The Biological Bulletin. 153:453-467
ISSN:	1939-8697 0006-3185
DOI:	10.2307/1540600
Popis:	The structure and function of the external features of sabellid polychaetes are described, with special reference to the species Branchiomma nigromaculata. Form and function particularly are analyzed with reference to the ability of such worms to survive radical mutilation by predators. In addition to adaptive features already known, namely, "shadow reflex" withdrawal involving giant axon stimulation, autotomy of the crown, regeneration of a head, and reorganization of a new thorax from old abdominal segments, the crucial structural modification in the intact worm is the parapodial inversion of all segments posterior to the first eight or so anterior segments. This enables the parapodia to dig into the inner wall of the tube in such a way that a predator cannot pull an entire worm out of the tube. A posterior part is inevitably left behind to reconstitute a complete individual.During postlarval growth, in several species, namely, Potamilla neglecta, Sabella microphthalma, and Fabricia sabella, all with co...
Databáze:	OpenAIRE
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