期刊
PHYCOLOGIA
卷 48, 期 6, 页码 480-491出版社
TAYLOR & FRANCIS LTD
DOI: 10.2216/09-04.1
关键词
Calcification; Caribbean Sea; Corals; Ramicrusta textilis; Secondary pit connections; Systematics
资金
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chair Program, Canada Foundation
Ramicrusta textilis sp. nov. (Peyssonneliaceae, Gigartinales) is described from shallow, nearshore waters of Jamaica (Caribbean Sea). The reddish-gold to brown thalli grow on bedrock and dead coral heads, but they may also overgrow living corals. Thallus morphology is highly variable; a single confluent thallus may include smooth, prostrate crustose portions, overlapping foliose lobes, curtainlike erect lobes, and apically flaring columns. Tabular basal cells in parallel Filaments support downgrowing, unicellular rhizoids on the ventral surface and branching assurgent filaments toward the dorsal surface. Extensive formation of secondary pit connections among lower cells of the assurgent filaments join cells of adjacent Filaments along a horizontal axis that is oblique to that of each subtending layer, resulting in a pseudoparenchymatous construction that is highly patterned and tightly integrated. The outer cortex contains large cells associated with raised rims on the thallus surface, and these cells are interpreted as hair cell initials. Calcification is extensive, and the structure of the mineral skeleton, exposed by removal of orgarlic material, is described by scanning electron microscopy. Peyssonnelia calcea and Ramicrusta nanhaiensis, both known only from the Indo-Pacific Ocean, are the only other peyssonnelioid species whose vegetative anatomy involves secondary pit connections or cell fusions, and their relationship to R. textilis is considered. Molecular analyses also indicate a relationship with R. nanhaiensis and support assignment of this new species to the genus Ramicrusta.
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