Ultrastructure and development of the ooecial walls in some calloporid bryozoans.

A.N. Ostrovsky, P. Schäfer, D.P. Gordon

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

9 Цитирования (Scopus)

Аннотация

In the brood chambers (ovicells) of six calloporid cheilostomes studied each skeletal wall consists of four calcified layers: (1) a very thin superficial layer of planar spherulitic crystallites, (2) an upper (outer) layer with wall-perpendicular prismatic ultrastructure, (3) an intermediate lamellar layer, and (4) a lower (inner) wall-perpendicular prismatic layer. Comparative studies of both the ovicell wall ultrastructure and early ovicell formation showed a hypothetical opportunity for evolving complex (multilayered) skeletal walls by fusion of the initially separated gymnocystal and cryptocystal calcifications in Cheilostomata. In two species studied, a bilobate pattern in the final stage of the formation of the ooecial roof was encountered in specimens with the cuticle preserved. A possible explanation to this finding is discussed – the bilobate pattern is suggestive of the hypothetical origin of the brood chamber from (1) two flattened spines, or (2) reduction in spine number of an originally multispinous ovicell.
Язык оригиналаанглийский
Страницы (с-по)223-240
ЖурналZoologischer Anzeiger
Том242
Номер выпуска3
DOI
СостояниеОпубликовано - 2003

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