DESCRIPTION OF ARGENTHINA EMILYAE, A NEW GENUS AND SPECIES OF OCENEBRINE MURICID GASTROPODS FROM THE EARLY MIDDLE MIOCENE OF ARGENTINA

Argenthina emilyae is a new genus and species of extinct muricid gastropods from the early Middle Miocene of southern Argentina. Most of its shell features are consistent with those of the Acanthina-clade of Thais-like ocenebrines, including a broad, rounded body whorl, a large aperture lacking orna...

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Bibliographic Details
Published inJournal of paleontology Vol. 79; no. 5; pp. 939 - 943
Main Authors HERBERT, GREGORY S, DEL RÍO, CLAUDIA JULIA
Format Journal Article
LanguageEnglish
Published New York, USA Cambridge University Press 01.09.2005
Paleontological Society
Subjects
Argenthina emilyae
Argentina
Astra Argentina
Biological taxonomies
Canals
Cenozoic
Chenque Formation
Chubut Argentina
Evolution
Extinct species
Fossils
Gastropoda
Genera
Geology
Invertebrata
invertebrate
middle Miocene
Miocene
Mollusca
Mollusks
morphology
Muricidae
Neogastropoda
Neogene
New genus
new taxa
Paleontology
Patagonia
Phylogeny
South America
Taxa
Taxonomy
Tertiary
Varicose veins
Argentina
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Summary:Argenthina emilyae is a new genus and species of extinct muricid gastropods from the early Middle Miocene of southern Argentina. Most of its shell features are consistent with those of the Acanthina-clade of Thais-like ocenebrines, including a broad, rounded body whorl, a large aperture lacking ornamentation, and a short, open siphonal canal, although other characters are consistent with the Ocinebrina-like ocenebrines, such as the differentiation of axials into varices and intervaricals and complex spiral sculpture. This combination of traits is unique in the Ocenebrinae. It is not yet clear whether this new taxon represents an episode of morphological experimentation by a stem group of Thais-like ocenebrines resulting in convergence on the Ocinebrina-like shell form or an evolutionarily intermediate step between Thais-like and Ocinebrina-like ocenebrines. Intermediates are expected from previously published phylogenetic hypotheses for the Ocenebrinae that suggest Ocinebrina-like ocenebrines have evolved multiple times from Thais-like ocenebrines. Until now, however, such intermediates have not been reported from the fossil record.
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ISSN:0022-3360
1937-2337
DOI:10.1666/0022-3360(2005)079[0939:DOAEAN]2.0.CO;2