Freshwater mussels from South America: state of the art of Unionida, specially Rhipidodontini

Abstract

Miyahira, I. C.; Santos, S. B.; Mansur, M. C. D. Freshwater mussels from South America: state of the art of Unionida, specially Rhipidodontini. Biota Neotropica. 17(4): e20170341. http://dx.doi.org/10.1590/1676-0611-BN-2017-0341Abstract: Unionida is the most diverse clade of freshwater bivalves. Among the groups occurring in South America, one with the highest number of species is Rhipidodontini (Hyriidae, Unionida, Paleoheterodonta, Bivalvia). However several issues remains on taxonomy and systematic of this group, leading to problems on species identification, description, as also as a limiting factor to other type of studies (e.g., ecology, conservation,…). In this paper is presented a synthesis of available knowledge about Diplodon Spix in Wagner, 1827 and Rhipidodonta Mörch, 1853 in South America, as a first step in order to a better understating of Rhipidodontini. The evaluation of different authors exposes the little agreement between them that resulted in a sort of divergent taxonomical opinions. Some comments on ecology, conservation and habitat preferences were made. This work can also encourage future research on taxonomy, systematic, ecology and conservation of freshwater mussels in South America.

Diplodon Cf. Colhuapiensis (Bivalvia - Hyriidae) in the Santa Cruz Formation (Early-Middle Miocene), at the Río Santa Cruz, Patagonia, Argentina. Stratigraphic and Paleoenvironmental Considerations

“…For example, the species D. chilensis inhabits lentic and lotic waters of the Manso basin that drain into the Pacific Ocean (Bonetto, 1973). In addition, they are commonly seen in shallow waters, close to 30 cm deep (Miyahira et al, 2017), or in association with roots of aquatic plants (Avelar and Cunha, 2009).…”

“…It is found throughout South America, from the Equator to the Patagonian lakes and rivers of Argentina and Chile. The family Hyriidae, in particular, is represented in South America by seven genera (Miyahira et al, 2017). Two of them are present in Argentina: Diplodon and Castalia, the former with 14 living species and the latter, with only two (Torres et al, 2018).…”

Morphology and distribution of the freshwater mussel Diplodon granosus, a rare and poorly understood species

“…Simpson (1914) included some species described for Brazil in the synonymy of D. granosus, such as D. multistriatus, D. psammactinus and D. pfeifferi. Haas (1931Haas ( , 1969 proposed three subspecies for D. granosus, and illustrated the species with others related to D. multistriatus, such as D. granuliferus and D. coriaceus, both described for the state of Rio de Janeiro (Miyahira et al 2017;2019). Simone (2006) made a similar arrangement and illustrated Diplodon granosus with a specimen of Diplodon multistriatus, adding two species that are synonym with Diplodon multistratus (D. granuliferus and D. psammactinus) in the synonymy of D. granosus.…”

“…Martínez-Escarbassiere and Royero (1995) presented a brief description of the shell and some details of the glochidium of D. granosus. Recent revisions, mostly based on shell features, considered D. granosus as valid, with several species in synonymy (Simone 2006;Pereira et al 2014;Miyahira et al 2017), yet its soft parts were still practically unknown. Recently, Diplodon ellipticus and D. multistriatus were redescribed (Miyahira et al 2013;2019) and the differences of these species compared to D. granosus were pointed out.…”

Los Moluscos Fluviales en La Subsistencia De Los Grupos Cazadores-Recolectores Del Humedal Del Paraná Inferior.

“…1 Existen algunas controversias en las clasificaciones sistemáticas de los moluscos de este género (Miyahira et al 2017, Rumi et al 2008. Remitimos al lector interesado a estos dos trabajos y a la bibliografía allí citada.…”