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A new dendroceratid sponge with reticulate skeleton.
|Authors:||Maldonado, Manuel ; Uriz, María Jesús|
|Citation:||Memoirs of the Queensland Museum 44 : 353-359 (1999)|
|Abstract:||A new encrusting dendroceratid sponge characterised by a skeletal network of ascending primary spongin fibers transversally interconnected by secondary fibers is described from the Alboran Sea (W Mediterranean). Primary fibers, provided with a subcircu1ar basal plate for attachment to the substratum, are unbranched or poorly branched, fasciculate in most cases, with a pith containing foreign material, and a laminated bark. Secondary fibers are also laminated, usually lack any coring material, and may form fenestrated plates around the point where they anastomose to a primary fiber. The reticulation ofthe skeleton is loose and in'egular, so that some primary fibers are interconnected through their basal portions only, some are interconnected along their apical portion, and some are even isolated, lacking any transversal interconnection. Although skeletal features of both the darwinellid genus Aplysilla and the dictyodendrillid genus /gernella are recognisable in this new sponge, it cannot be taxonomically assigned to either genus, unless the em-rent diagnosis ofone ofthem is modified. A reanalysis ofthe chemical, histological and skeletal evidence available to date gives little support to the hypothesis that reticulate skeletons appeared in Dendroceratida as a single evolutionary event. Consequently, we propose expanding the diagnosis ofthe genus Pleraplysilla to include species with an irregular network of secondary fibers, such as Pleraplysilla reticulata sp. nov. 0 Porifera, Keratose sponges, Dendroceratida, Pleraplysilla, Darwinellidae, Dictyodendrillidae, new species.|
|Description:||7 páginas, 2 figuras.|
|Appears in Collections:||(CEAB) Artículos|
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