Comparative anatomy of internal incubational sacs in cupuladriid bryozoans and the evolution of brooding in free-living cheilostomes

A.N. Ostrovsky, A. O’Dea, F. Rodrígues

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

19 Цитирования (Scopus)

Аннотация

Numerous gross morphological attributes are shared among unrelated free-living bryozoans revealing convergent evolution associated with functional demands of living on soft sediments. Here, we show that the reproductive structures across free-living groups evolved convergently. The most prominent convergent traits are the collective reduction of external brood chambers (ovicells) and the acquisition of internal brooding. Anatomical studies of four species from the cheilostome genera Cupuladria and Discoporella (Cupuladriidae) show that these species incubate their embryos in internal brooding sacs located in the coelom of the maternal nonpolymorphic autozooids. This sac consists of a main chamber and a narrow neck communicating to the vestibulum. The distal wall of the vestibulum possesses a cuticular thickening, which may further isolate the brood cavity. The presence of this character in all four species strongly supports grouping Cupuladria and Discoporella in one taxon. Further evidence suggests that the
Язык оригиналаанглийский
Страницы (с-по)1413-1430
ЖурналJournal of Morphology
Том12
Номер выпуска270
DOI
СостояниеОпубликовано - 2009

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