Cenozoic fossil mollusks from western Pacific islands; gastropods (Eulimidae and Volutidae through Terebridae)

Ladd, Harry S.

doi:10.3133/pp1171

Cited by 12 publications

(12 citation statements)

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“…Varicobela in the Borsoniidae (Eocene-Oligocene), Tenaturris in Mangeliidae (Miocene-Recent), and several species of Inquisitor (Pseudomelatomidae, Eocene-Recent; Fig. 2K) have occasional, unsynchronized varices in the form of broader ribs (Powell, 1966;Ladd, 1982). A subterminal dorsal varix is also found in the recent Darbya (Borsoniidae).…”

Section: Conoideamentioning

confidence: 99%

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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Section: Conoideamentioning

confidence: 99%

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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“…On the contrary, the occurrence of Homalopoma tosaense Habe, 1953, which is known from the Pliocene of Viti Levu, Fiji as Homalopoma druidi Ladd, 1982 andSeguenzia donaldi Ladd, 1982, which was described from the Pleistocene of Santo, Vanuatu, in the studied Philippine fauna demonstrates that at least some deep water mollusk species have had a very broad distribution. Additionally, the extensive work of Geiger (2012) on modern scissurellid snails shows no biogeographic differentiation within the western tropical Pacific (including New Zealand, New Caledonia and the Philippine area).…”

Section: Discussionmentioning

confidence: 97%

“…Apart from the studied material, this species is known from Tosa Bay and southern Kyushu (Japan), East China Sea (Higo et al 1999), as well as Pliocene deposits of Viti Levu, Fiji (Ladd 1982).…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…Homalopoma druidi (Ladd, 1982) is synonymized here with Homalopoma tosaense Habe, 1953 and Leptothyra tosaensis (Habe, 1953), because of its overall similar conchology. Although the holotype of Homalopoma druidi (Ladd, 1982) has a rather high spire when compared to the holotype of Leptothyra tosaensis (Habe, 1953), its spire height falls well within the range of intraspecific variation observed on the website: http:// www.conchology.be/?t=27&family=COLLONIIDAE&species=Leptothyra%20tosaensis. It remains unclear whether the species should be assigned to Leptothyra or Homalopoma, as these genera are not well delimited.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…Apart from the studied material, this species is known from Pleistocene deposits of Vanuatu (Ladd 1982).…”

Section: Seguenzia Donaldimentioning

confidence: 99%

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On some Vetigastropoda (Mollusca, Gastropoda) from the Plio-Pleistocene of the Philippines with descriptions of three new species

Helwerda

Wesselingh

Williams

2014

Zootaxa

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We studied representatives of seven vetigastropod families in an extremely well-preserved Plio-Pleistocene mollusc fauna found in relatively deep water sediments (c. 200-300 m paleodepth) from the north-western Philippines. The fauna is systematically described and its paleoenvironmental and paleobiogeographical character is explored. Twenty-six species of gastropods were studied, three of which are described as new: Halystina conoidea n. sp., Calliotropis arenosa n. sp. and Ethminolia wareni n. sp.

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Early Miocene reef- and mudflat-associated gastropods from Makran (SE-Iran)

Harzhauser

Reuter

Piller

2017

PalZ

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A new gastropod fauna of Burdigalian (early Miocene) age is described from the Iranian part of Makran. The fauna comprises 19 species and represents three distinct assemblages from turbid water coral reef, shallow subtidal soft-bottom and mangrove-fringed mudflat environments in the northern Indian Ocean. Especially the reef-associated assemblage comprises largely new species. This is explained by the rare occurrence of reefs along the northern margin of the Miocene Indian Ocean and the low number of scientific studies dealing with the region. In terms of paleobiogeography, the fauna corresponds well to coeval faunas from the Pakistani Balochistan and Sindh provinces and the Indian Kathiawar, Kutch and Kerala provinces. During the early Miocene, these constituted a discrete biogeographic unit, the Western Indian Province, which documents the near complete biogeographic isolation from the Proto-Mediterranean Sea. Some mudflat taxa might represent examples of vicariance following the Tethys closure. The fauna also displays little connection with coeval faunas from Indonesia, documenting a strong provincialism within the Indo-West Pacific Region during early Miocene times. Neritopsis gedrosiana sp. nov., Calliostoma irerense sp. nov., Calliostoma mohtatae sp. nov. and Trivellona makranica sp. nov. are described as new species.

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Cenozoic fossil mollusks from western Pacific islands; gastropods (Eulimidae and Volutidae through Terebridae)

Cited by 12 publications

References 4 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

On some Vetigastropoda (Mollusca, Gastropoda) from the Plio-Pleistocene of the Philippines with descriptions of three new species

Early Miocene reef- and mudflat-associated gastropods from Makran (SE-Iran)

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