On the Anatomy and Affinities of Plicatula

Watson, Hugh

doi:10.1093/oxfordjournals.mollus.a064002

Cited by 5 publications

(1 citation statement)

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“…There is as yet no agreement on the closest outgroup for the Dimyidae, although there is general agreement that the family is related to the Prospondylidae Pchelinceva, 1960, Plicatulidae Watson, 1930, andAnomiidae Rafinesque, 1815, families that were placed in a new suborder Prospondyloidina by Waller in Waller and Stanley (2005, p. 47). Hautmann (2001aHautmann ( , 2004 provided evidence, based on the timing of evolutionary trends in alivincular-fossate ligament systems, that the Dimyidae and Plicatulidae probably evolved independently, the Plicatulidae from a prospondylid ancestor and the Dimyidae from a more remote pectinoid ancestry.…”

Section: Phylogenymentioning

confidence: 99%

Morphology, phylogeny, and systematic revision of genera in the Dimyidae (Mollusca, Bivalvia, Pteriomorphia)

Waller

2012

J. Paleontol.

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Differences in the mineralogy of hinge teeth and inner shell layers in the family Dimyidae form the basis for a revision of genera. The stem genusAtreta(Late Triassic to Late Cretaceous) has aragonitic denticulate hinge teeth on the right valve articulating with pitted sockets on the left valve. The same arrangement is present inNeoatretan. gen. (Paleocene? Miocene to Recent) but with the appearance of extensive calcitic overarching of the resilifer. InDimyella(Eocene to Recent), aragonitic teeth and sockets are still present but are modified into hook shaped denticulate teeth with corresponding sockets. All three of these genera have inner aragonitic crossed-lamellar shell layers that extend well outside the pallial line. In contrast,Dimya(Eocene to Recent) andBasiliomya(Pliocene to Recent) comprise a second clade in which aragonitic hinge teeth are absent and hinge articulation is calcitic, derived from the calcitic rim.Dimyahas only weak hinge articulation and has an aragonitic inner shell layer delimited by the pallial line; inBasiliomyacalcitic hinge teeth are more prominent and the entire inner shell layer inside the pallial line is foliated calcite.Diploschiza(Cretaceous, Albian to Maastrichtian), here reinstated from synonymy withAtreta, is probably a precursor of theDimya-Basiliomyaclade based on incipient calcitic hinge teeth. Predation pressures probably drove the evolution of this cemented family from its original habitat on hardgrounds in moderately deep water into much greater depths or into cryptic habitats, including submarine caves.New combinations areDimyella malnatrensis(Corselli and Bernocchi),D. molokaia(Dall, Bartsch, and Rehder),D. similis(v. Koenen),Neoatreta dissimilis(Tate),N. filipina(Bartsch),N. kaiparaensis(Laws),N. phaidra(Woodring),and N. plana(Martin).

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Section: Phylogenymentioning

confidence: 99%

Morphology, phylogeny, and systematic revision of genera in the Dimyidae (Mollusca, Bivalvia, Pteriomorphia)

Waller

2012

J. Paleontol.

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Plicatulid bivalves from the Coniacian–Santonian Matulla Formation, Wadi Sudr, western Sinai, Egypt

El-Hedeny

Aal

Maree

et al. 2001

Cretaceous Research

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Comparative sperm ultrastructure in pteriomorphian bivalves with special reference to phylogenetic and taxonomic implications

Healy

Keys

Daddow

2000

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Pteriomorphian spermatozoa, like those of most other bivalves, are of the classic aquasperm type (conical acrosomal vesicle, short to rod-shaped nucleus, short midpiece composed of two centrioles and a ring of spherical mitochondria, a simple flagellum). Whereas most other bivalve subclasses show at least some defining acrosomal feature(s), this does not appear to be the case within the Pteriomorphia. While this could indicate non-monophyletic status, it also correlates with the fact that the Pteriomorphia are a very old and very successful group of bivalves. Acrosomal similarities suggest a close link between the Ostreoidea and Limoidea (acrosomal vesicle with wedge-shaped apical zone; radiating plates present but not well developed); and between the Pterioidea, Pinnoidea and Pectinoidea (dense anterior layer; very well developed radiating plates). For supposedly closely related taxa, the Arcoidea and Limopsoidea (both Arcoida) differ markedly from each other in acrosomal shape and substructure. The affinities of the Anomioidea and even more so the Mytiloida remain uncertain, the latter possibly connected with the Pterioidea or, more likely, removed from the rest of the Pteriomorphia (mytiloid acrosomes show concentric lamellae). A very close relationship between the Pectinidae and Spondylidae of the Pectinoidea is demonstrated (dense anterior layer of acrosome recurved). Within the Mytilidae (Mytiloidea) there is substantial variation in sperm morphology between supraspecific taxa especially at the subfamial level.

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On the Anatomy and Affinities of Plicatula

Cited by 5 publications

References 0 publications

Morphology, phylogeny, and systematic revision of genera in the Dimyidae (Mollusca, Bivalvia, Pteriomorphia)

Morphology, phylogeny, and systematic revision of genera in the Dimyidae (Mollusca, Bivalvia, Pteriomorphia)

Plicatulid bivalves from the Coniacian–Santonian Matulla Formation, Wadi Sudr, western Sinai, Egypt

Comparative sperm ultrastructure in pteriomorphian bivalves with special reference to phylogenetic and taxonomic implications

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