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André Freiwald

  • Biodiversity Journal, 12 (4): 0777-0792

    Leon Hoffman & André Freiwald
    Bathyal species in Rissoidae (Gastropoda) from Azorean seamounts
    https://doi.org/10.31396/Biodiv.Jour.2021.12.4.777.792
    https://www.zoobank.org/References/eea7d594-3e66-4183-9d06-827f3c930613

    ABSTRACT
    Three new species in the family Rissoidae (Gastropoda) have been found in bioclastic sediment samples taken on the bathyal slopes of two Azorean seamount areas during the cruise M151 Athena by R/V Meteor: Alvania templadoi n. sp., Crisilla avilai n. sp. and Crisilla herosae n. sp. A review of endemicity in bathyal rissoids is presented; the large majority (81%) of the rissoids are endemic to the Azorean region. The distribution of species is frequently (20% of rissoids) limited to a single seamount, a seamount cluster or to the full Azorean seamounts and islands province. The degree of endemicity is comparable between the northern and southern Azorean seamount areas and between shallow-water species and bathyal species in the northern area. Endemic species and genera evolved after the formation of the islands and seamounts during the Neogene following an early population by species from eastern Atlantic genera.