Abstract
Shell chirality among Cambrian gastropods is discussed. It is demonstrated that the earliest members of the class include chiral aberrations with abnormal opposite coiling of the shell. It is assumed that, in Cambrian gastropods, speciation could have occurred by mutation in the locus determining the chirality, as is proposed for extant gastropods. In contrast to modern gastropods, the existence of chiral morphs within single species has not been recorded in Cambrian mollusks, whereas the presence of chiral twin species is possible. The systematic position of sinistral representatives of the genus Aldanella Vostokova, 1962 is considered. Aldanella golubevi sp. nov. with sinistral shell is described from the base of the Tommotian Stage of the Anabar Region. Aberrant sinistral specimens of the normally dextral species Aldanella utchurica Missarzhevsky in Rozanov et al., 1969 and Pelagiella adunca Missarzhevsky in Rozanov et al., 1969 are figured.
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Original Russian Text © P.Yu. Parkhaev, 2007, published in Paleontologicheskii Zhurnal, 2007, No. 3, pp. 3–9.
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Parkhaev, P.Y. Shell chirality in Cambrian gastropods and sinistral members of the genus Aldanella Vostokova, 1962. Paleontol. J. 41, 233–240 (2007). https://doi.org/10.1134/S003103010703001X
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DOI: https://doi.org/10.1134/S003103010703001X