Abstract
The freshwater sponges Trochospongilla variabilis Bonetto & Ezcurra de Drago (1973), Radiospongilla crateriformis (Potts, 1882), Spongilla cenota Penney & Racek (1968) and Corvoheteromeyenia heterosclera (Ezcurra de Drago, 1974) compose with the sphaerid bivalve Eupera cubensis (Prime, 1865) and several Phylactolaemata bryozoans a benthic filter feeding community living in seasonal lentic and lotic habitats with high Particulate Organic Carbon (POC), low conductivity and acid pH within the Costa Rica Dry Forest biome. The sponge specimens gathered led to the re-description of the four species.
Highlights
The first record of the occurrence of freshwater sponges in Central America and the Antilles was made by MEEK (1908), who assigned Eunapius fragilis (Leidy, 1851) to Guatemala
POIRRIER (1977) refered to a personal communication by Vincent Resh concerning the occurrence of Anheteromeyenia ryderi (Potts, 1882) in Belize
The paper presents the first register of species of sponges that compete with Bryozoans and sessile bivalves in a freshwater environment
Summary
Gemmules extremely abundant, distributed throughout the skeleton, but in a closer arrangement towards the basal part of the sponge; large, withish, tuberculated due to irregular projections of the thick, pneumatic and outer coat layers; gemmular surface hispid due to the projection of gemmoscleres extremities or incrusted slanting megascleres
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