Nucinella Wood, 1851 Bivalves from the latest Jurassic-earliest Cretaceous hydrocarbon seep carbonates from central Spitsbergen, Svalbard Hryniewicz, Krzysztof Little, Crispin T. S. Nakrem, Hans Arne Zootaxa 2014 2014-09-02 3859 1 1 66 Vokes, 1956 Vokes 1956 [246,557,548,574] Bivalvia Nucinellidae GBIF Animalia Solemyoida 11 12 Mollusca family   Genus  Nucinella Wood, 1851    Typespecies.  Pleurodon ovalis Wood, 1840   Remarks.  Nucinellahas sometimes been placed in the family Manzanellidae Chronic, 1952(e.g. Amano et al.2007; Kiel et al.2008a). However, the Permian genus  Manzanella Girty, 1909, is longer than high, with roughly equidistantly positioned beaks. Furthermore, it is dimyarian, with anterior and posterior adductor muscle scars roughly equal in size ( Chronic 1952). This contrasts with the genus  Nucinella Wood, 1851, which is monomyarian and has a very short posterior shell margin (e.g. Allen & Sanders 1969). A dimyarian condition was previously postulated for the supposed sister genus  Huxleyia Adams, 1860(e.g. Habe 1958; pl. 9, fig. 16; La Perna 2004, p. 571). However, investigation of  Huxleyia habooba Oliver & Taylor, 2012, and  Huxleyia sulcata Adams, 1860, revealed no sign of a posterior adductor muscle, which supports separation of  Nucinellaand  Huxleyiainto a separate family Nucinellidae ( Oliver & Taylor 2012), with Manzanellidaerestricted to the genus  Manzanella.