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Article Dans Une Revue BasteriaTijdschrift van de Nederlandse Malacologische vereni Année : 2012

The taxonomic confusion surrounding Pisidium (Bivalvia, Sphaeriidae): the possible birth of a new taxon

Résumé

The presence of Pisidium shells with an appendiculum, presenting specific morphological characteristics not yet described has been observed for several years. Although their external shell traits appear similar the ligament-pit of these individuals differs: it is either long and narrow as in P. supinum, or shorter and thicker as in that of the ponderosa form of P. casertanum and would therefore belong to one or the other of these two species. They could also be the result of hybridisation and constitute a new taxon.genre, and raising one of these alleged forms or varieties to species rank often gives rise to debate (Dyduch-Falniowska, 1983; Kuiper, 1983; Piechocki, 1989; Araujo & Korniushin, 1998; Glöer & Zettler, 2005). On the contrary, polymorphism is quite limited in other species such as Pisidium henslowanum (Sheppard, 1823), P. supinum ( A. Schmidt, 1851) or P. milium Held, 1936. For several years shells with an appendiculum (a more or less oblique fold located close to the top of each valve) and resembling P. supinum or forma plicata Zeissler, 1962, of P. casertanum, but presenting specific characters have been observed in rivers and canals. The aim of this article is to describe the particularities of these individuals that have not yet been mentioned.
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hal-04423682 , version 1 (01-02-2024)

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  • HAL Id : hal-04423682 , version 1

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Jeaque Mouthon, Khedidja Abbaci. The taxonomic confusion surrounding Pisidium (Bivalvia, Sphaeriidae): the possible birth of a new taxon. BasteriaTijdschrift van de Nederlandse Malacologische vereni, In press. ⟨hal-04423682⟩

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