Connecting pattern to process: Growth of spiral shell sculpture in the gastropod Nucella ostrina (Muricidae: Ocenebrinae)

2018 ◽  
Vol 20 (5) ◽  
pp. 160-171 ◽  
Author(s):  
Nicole B. Webster ◽  
A. Richard Palmer
Keyword(s):  
Nucella Ostrina ◽  
Shell Sculpture

A review of extant Tudivasum Rosenberg & Petit, 1987 (Neogastropoda: Turbinellidae) and description of three new species from Western Australia

2020 ◽  
Author(s):  
Hugh M Morrison ◽  
Lisa A Kirkendale ◽  
Nerida G Wilson
Keyword(s):  
New Species ◽  
Western Australia ◽  
Sequence Data ◽  
Dna Sequence Data ◽  
The Third ◽  
Extant Species ◽  
Low Diversity ◽  
Three New Species ◽  
Morphological Species ◽  
Shell Sculpture

ABSTRACT Tudivasum Rosenberg & Petit, 1987 is a morphologically distinct gastropod genus of low diversity. All but one species are known from Australia and they occur from the intertidal zone down to hundreds of metres on the continental shelf. These carnivorous gastropods are thought to have intracapsular development. The six currently recognized extant species are reviewed here and their geographical ranges clarified. Two new species, Tudivasum chaneyi n. sp. and T. ashmorense n. sp., are described from Ashmore Reef, Western Australia, and are characterized by differences in protoconch colour and shell sculpture. The third new species, T. westrale n. sp., is described from the mid-west coast of Western Australia, where it has long been misidentified as T. spinosum (H. Adams & A. Adams, 1864). We generated a molecular phylogeny based on mitochondrial DNA sequence data to test morphological species concepts and reconstruct relationships among four of the described species. High levels of divergence within one of the new species could indicate an additional cryptic species.

Environmental Control on Shell-Sculpture of the Miocene Pectinid“Chlamys” Actinodes(Sowerby, 1846) (Patagonia, Argentina)

Ameghiniana ◽  
2016 ◽  
Vol 53 (6) ◽  
pp. 645-654 ◽  
Author(s):  
Claudia J. Del Río ◽  
María B. Santelli ◽  
Federico Márquez
Keyword(s):  
Environmental Control ◽  
Shell Sculpture

Molecular analysis reveals a new cryptic species in a limpet Lottia kogamogai (Patellogastropoda: Lottiidae) from Japan

Zootaxa ◽  
2017 ◽  
Vol 4277 (2) ◽  
pp. 237 ◽  
Author(s):  
RYO NAKAYAMA ◽  
TAKENORI SASAKI ◽  
TOMOYUKI NAKANO
Keyword(s):  
New Species ◽  
Cryptic Species ◽  
Intraspecific Variation ◽  
Molecular Analysis ◽  
Coi Gene ◽  
Northern Population ◽  
Mitochondrial Coi ◽  
Mitochondrial Coi Gene ◽  
Shell Sculpture

A group of small lottiid species in Japan, the Lottia kogamogai complex, was phylogenetically analyzed based on the mitochondrial COI gene. As a result, L. kogamogai is subdivided into two geographic clades. Lottia kogamogai s.s. is limited to southern temperate Japan. The northern population formerly considered an intraspecific variation of the species is shown to be a distinct new species, here described as Lottia goshimai n. sp. The new species is distinguishable from L. kogamogai not only genetically, but in radular morphology and shell sculpture. 

Shell sculpture as a defensive adaptation in ammonoids

Paleobiology ◽  
1981 ◽  
Vol 7 (1) ◽  
pp. 96-100 ◽  
Author(s):  
Peter Ward
Keyword(s):  
Late Mesozoic ◽  
Hydrodynamic Efficiency ◽  
Defensive Function ◽  
Mesozoic Marine Revolution ◽  
Shell Sculpture

Quantification of Paleozoic, Triassic, Jurassic, and Cretaceous ammonoid shell ornamentation shows that commonality and roughness of ornamentation increased throughout the geologic range of the ammonoids. The two major hypotheses concerning the function of ammonoid shell ornamentation are that 1) ornament served a protective (defensive) function against shell breakage by predators, and 2) it increased hydrodynamic efficiency of the shell during swimming. The heavily ribbed and spined ammonoid shells of the late Mesozoic have ornamentation too coarse to have served any hydrodynamic purpose. The increasing proportion of such shells during the Jurassic and Cretaceous may have been in response to increased numbers of late Mesozoic shell crushing predators and “better armed” ammonoid prey. This trend parallels adaptive trends of other invertebrate groups during the “Mesozoic marine revolution” as defined by Vermeij (1977).

Variation in Freshwater Mussel Shell Sculpture and Shape Along a River Gradient

2010 ◽  
Vol 164 (1) ◽  
pp. 22-36 ◽  
Author(s):  
Daniel J. Hornbach ◽  
Valerie J. Kurth ◽  
Mark C. Hove
Keyword(s):  
Freshwater Mussel ◽  
Mussel Shell ◽  
Shell Sculpture

The Gastrocoptinae of Australia (Gastropoda : Pulmonata : Pupilloidae): Systematics, distribution and origin

1996 ◽  
Vol 10 (5) ◽  
pp. 1085 ◽  
Author(s):  
BM Pokryszko
Keyword(s):  
Pacific Islands ◽  
New Guinea ◽  
Coastal Areas ◽  
Nominal Species ◽  
Shell Sculpture

The Gastrocoptinae of Australia are revised on the basis of over 13 000 specimens from nearly 600 localities. Of 23 nominal species 12 are synonymised; Gastrocopta stupefaciens, sp. nov., and G. solemorum, sp. nov., are described, making a total of 13 species. A key to the species is provided. Pumilicopta Solem, 1989 is reduced to subgeneric rank. Eleven of 13 species are endemic to Australia, one to Australia and New Guinea, and one is recorded from Australia and some Pacific islands. The gastrocoptines inhabit only coastal areas and the 'Red Centre'; only three species are exclusively southern. Relationships with extralimital taxa, based on derived characters of apertural barriers and shell sculpture, indicate that the gastrocoptines colonised Australia at least four times from Asia and adjacent islands. The first immigration may have taken place in the mid-Miocene.

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