Lower Cretaceous ammonites from the Neuquén Basin, Argentina: the Hauterivian genus Holcoptychites

Holcoptychites is known only from the Neuquén Basin, Argentina, but appears close to the more widespread genera Jeanthieuloyites and Spitidiscus. Thus it is placed in the subfamily Spitidiscinae (Family Holcodiscidae). Previously described Holcoptychites species are revised and their taxonomy clarif...

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Bibliographic Details
Published inCretaceous research Vol. 24; no. 5; pp. 589 - 613
Main Authors Aguirre-Urreta, Marı́a B., Rawson, Peter F.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2003
Subjects
Ammonites
Argentina
Biostratigraphy
Holcodiscidae
Holcoptychites
Lower Cretaceous
Lower Hauterivian
Neuquén Basin
Spitidiscinae
Spitidiscinae
Holcodiscidae
Argentina
Neuquén Basin
Holcoptychites
Lower Cretaceous
Ammonites
Lower Hauterivian
Biostratigraphy
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Summary:Holcoptychites is known only from the Neuquén Basin, Argentina, but appears close to the more widespread genera Jeanthieuloyites and Spitidiscus. Thus it is placed in the subfamily Spitidiscinae (Family Holcodiscidae). Previously described Holcoptychites species are revised and their taxonomy clarified, while one new species is left under open nomenclature. The sequence of forms allows two subzones to be recognized. These are correlated provisionally with the lowest Hauterivian Acanthodiscus radiatus Zone of the Mediterranean region.
ISSN:0195-6671
1095-998X
DOI:10.1016/S0195-6671(03)00073-9