Two new Lower Cretaceous rudists (Bivalvia-Hippuritacea) from the Huetamo Region; Southwestern Mexico

The rudists Huetamia buitronae nov. gen., nov. sp. and Douvillelia skeltoni nov. gen., nov. sp. are described and proposed as new taxa. They are components of a rudist assemblage of Early Aptian age from the Huetamo region in Southwestern Mexico. The stratigraphic unit is the Comburindio Formation,...

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Bibliographic Details
Published in:Geobios 1998, Vol.31, p.15-28
Main Authors: Alencaster, Gloria, Pantoja-Alor, Jerjes
Format: Article
Language:English
Subjects:
Aptien Inférieur
Caprinidae
Caprotinidae
Early Aptian
Mexico
Mexique
Rudistes
Rudists
Taxonomie
Taxonomy
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Summary:The rudists Huetamia buitronae nov. gen., nov. sp. and Douvillelia skeltoni nov. gen., nov. sp. are described and proposed as new taxa. They are components of a rudist assemblage of Early Aptian age from the Huetamo region in Southwestern Mexico. The stratigraphic unit is the Comburindio Formation, consisting of a thick sequence of volcaniclastic and siliciclastic rocks interlayered with fossiliferous rich carbonate biostromes. The new genus Huetamia is a coalcomanid caprinid somewhat similar to Planocaprina in the simplicity of the pallial canals. Douvillelia is a caprotinid nearly related to Horiopleura. The other members of the rudist assemblage are Amphitriscoelus waringi Harris & Hodson, also known from the Lower Aptian of Trinidad, Venezuela, Cuba and Texas, and the recently described taxa Amphitriscoelus pluriloculata Alencaster & Pantoja-Alor, Pantojaloria sphaerica Alencaster and Caprina massei Alencaster. Les rudistes Huetamia buitronae nov. gen., nov. sp. et Douvillelia skeltoni nov. gen., nov. sp. sont décritset proposes comme taxons nouveaux. Ils font partie d'un ensemble de rudistes datés de l'Aptien inférieur reconnu dans la région de Huetamo au Mexique sud-occidental. L'unité stratigraphique étudiée, la Formation Comburindio, consiste en une succession de roches volcanoclastiques et siliciclastiques intercalées de biostromes qui ont livré de nombreux fossiles. Le nouveau genre Huetamia est quelque peu similaire à Planocaprina à cause des canaux pyriformes simples. Douvillelia est un caprotinidé proche de Horiopleura. Les autres éléments de la faune sont Amphit iscoelus waringi Harris & Hodson de l'Aptien Inférieur de Trinidad, du Venezuela, de Cuba et du Texas, et les taxons décrits récemment Amphitriscoelus pluriloculata Alencaster & Pantoja-Alor, Pantojaloria sphaerica Alencaster et Caprina massei Alencaster.
ISSN:0016-6995
DOI:10.1016/S0016-6995(98)80061-2