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A new monotypic genus of neotropical freshwater sponges (Porifera-Spongillidae) and evidence of a speciation via hybridism
Volkmer-Ribeiro, C. (1976). A new monotypic genus of neotropical freshwater sponges (Porifera-Spongillidae) and evidence of a speciation via hybridism. Hydrobiologia 50(3): 271-281
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
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    Hybrids; New species; Reproduction; Taxonomy; Saturnospongilla Volkmer-Ribeiro, 1976 [WoRMS]; Saturnospongilla carvalhoi Volkmer, 1976 [WoRMS]; Trochospongilla delicata Bonetto & Ezcurra de Drago, 1967 [WoRMS]; Trochospongilla minuta (Potts, 1881) [WoRMS]; Fresh water

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  • Volkmer-Ribeiro, C.

    Particular characteristics of several specimens of a freshwater sponge integrating 2 communities of such sponges at river Jurua, Brazil, strongly indicate a hybrid origin for these specimens; Trochospongilla minuta (Potts, 1881) and T. delicata Bonetto & de Drago, 1967'sensu'Volkmer- Ribeiro et al. 1972, being the parental spp. However, the constancy and uniformity of the characteristics presented by all specimens do not support the hypothesis of origin from a hybrid swarm and allow the grouping of such characteristics under the term 'specific'. This fact, together with the present lack of studies on genetics of freshwater sponges, necessitated the erection of the new gen Saturnospongilla and the description of the new sp S. carvalhoi sp. nov. The complexity of the spicular set of this new gen facilitates generalization of the hypothesis of a hybrid origin of the other presently known monotypic genera of freshwater sponges which also display a 'multiple' spicular composition. Reproduction of these hybrid sponges is in agreement with presence of gemmules in all such monotypic genera. The hypothesis is also advanced that such sponges may be allopolyploid hybrids.

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