Northeast Pacific record of the Paleogene genus<i>Pseudoperissolax</i>(Neogastropoda: Muricidae: Muricinae) and its paleobiogeography

Squires, Richard L.

doi:10.1017/jpa.2015.41

J. Paleontol.

2015

DOI: 10.1017/jpa.2015.41

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Northeast Pacific record of the Paleogene genusPseudoperissolax(Neogastropoda: Muricidae: Muricinae) and its paleobiogeography

Richard L. Squires

Abstract: The geologic record of the shallow-marine gastropod genus Pseudoperissolax

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The varix: evolution, distribution, and phylogenetic clumping of a repeated gastropod innovation

Webster

Vermeij

2017

Zoological Journal of the Linnean Society

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A recurrent theme in evolution is the repeated, independent origin of broadly adaptive, architecturally and functionally similar traits and structures. One such is the varix, a shell-sculpture innovation in gastropods. This periodic shell thickening functions mainly to defend the animal against shell crushing and peeling predators. Varices can be highly elaborate, forming broad wings or spines, and are often aligned in synchronous patterns. Here we define the different types of varices, explore their function and morphological variation, document the recent and fossil distribution of varicate taxa, and discuss emergent patterns of evolution. We conservatively found 41 separate origins of varices, which were concentrated in the more derived gastropod clades and generally arose since the mid-Mesozoic. Varices are more prevalent among marine, warm, and shallow waters, where predation is intense, on high-spired shells and in clades with collabral ribs. Diversification rates were correlated in a few cases with the presence of varices, especially in the Muricidae and Tonnoidea, but more than half of the origins are represented by three or fewer genera. Varices arose many times in many forms, but generally in a phylogenetically clumped manner (more frequently in particular higher taxa), a pattern common to many adaptations.ADDITIONAL KEYWORDS: evolutionary trends -fossil record -Gastropoda -shell sculpture -snails.

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The varix: evolution, distribution, and phylogenetic clumping of a repeated gastropod innovation

Webster

Vermeij

2017

Zoological Journal of the Linnean Society

View full text Add to dashboard Cite

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Northeast Pacific record of the Paleogene genusPseudoperissolax(Neogastropoda: Muricidae: Muricinae) and its paleobiogeography

Abstract: The geologic record of the shallow-marine gastropod genus Pseudoperissolax

Cited by 1 publication

References 33 publications

The varix: evolution, distribution, and phylogenetic clumping of a repeated gastropod innovation

The varix: evolution, distribution, and phylogenetic clumping of a repeated gastropod innovation

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