KARYOTYPES OF 5 SUB-ANTARCTIC BIVALVE SPECIES

• Published in: Journal of Molluscan Studies
• Main Authors: THIRIOTQUIEVREUX, C, Albert, P, Soyer, J
• Other Authors: Station Zoologique de Villefranche, Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Observatoire océanologique de Banyuls (OOB), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 1991
• Subjects: [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; Antarctic; Antarc*
• Online Access: https://hal.archives-ouvertes.fr/hal-03476537; https://doi.org/10.1093/mollus/57.1.59

Chromosomes of five subantarctic species were studied from mitotic metaphases using cell suspension techniques. Among the Protobranchia, Malletia gigantea has a diploid chromosome number of 2n = 38 with five metacentric, seven submetacentric, five subtelocentric and one telocentric pairs, and Yoldia (Aequiyoldia) woodwardi also shows 2n = 38 but with ten metacentric, six submetacentric and three subtelocentric pairs. Among the Lamellibranchia, the pterioidan Limatula pygmaea has 2 n = 38 with six metacentric, eleven submetacentric and two subtelocentric pairs, the veneroidan Cyclocardia astartoides has 2n = 30 with five metacentric and ten telocentric pairs and the anomalodesmatan Laternula elliptica has 2n = 40 with two metacentric, one submetacentric, two subtelocentric and fifteen telocentric pairs. Our results indicate that in all the Nuculoidea studied so far, a diploid number of 2n = 38 has been found. In addition, the karyotypes show a close overall appearance in relative lengths with a majority of metacentric-submetacentric chromosomes. The species differ in the proportion of the different morphological types of chromosomes. In the Lamellibranchia, each species corresponds to a particular case within their respective orders (Pterioida, Veneroida, Anomalodesmata).