Upper Ordovician (Sandbian) Bryozoan Fauna from Argentine Precordillera

A stenolaemate bryozoan fauna containing 20 species belonging to 18 genera is described from the Las Plantas and Las Aguaditas formations (Upper Ordovician, Sandbian) in San Juan Province, Precordillera of Western Argentina. One genus with one species is new: Argentinodictya lenticulata n. gen. n. s...

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Bibliographic Details
Published in:Journal of paleontology 2012-09, Vol.86 (5), p.721-752
Main Authors: Ernst, Andrej, Carrera, Marcelo
Format: Article
Language:English
Subjects:
Argentina
Argentinodictya lenticulata
biogeography
Bryozoa
Chasmatopora
Chasmatopora rossae
Cyclostomata
Descriptive statistics
Fauna
faunal list
faunal studies
Fossils
Geological surveys
Geological time
Geology
Gualcamayo River
IGCP
Invertebrata
invertebrate
Jachal Argentina
Las Aguaditas Creek
Las Aguaditas Formation
Las Plantas Formation
lithostratigraphy
Middle Ordovician epoch
morphology
Murals
new taxa
Ordovician
Paleontology
Paleozoic
Paratypes
Parvohallopora parvula
Precordillera
Ptilodictya intermedia
San Juan Argentina
Sandbian
Skeleton
South America
Stenolaemata
Stratigraphy
Taxonomy
Trigonodictya parvula
Upper Ordovician
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Description
Summary:A stenolaemate bryozoan fauna containing 20 species belonging to 18 genera is described from the Las Plantas and Las Aguaditas formations (Upper Ordovician, Sandbian) in San Juan Province, Precordillera of Western Argentina. One genus with one species is new: Argentinodictya lenticulata n. gen. n. sp. (Cryptostomata, Ptilodictyina). Four species are new: one trepostome Parvohallopora parvula n. sp., two cryptostomes Trigonodictya parvula n. sp. and Ptilodictya intermedia n. sp., and phyloporinine Chasmatopora rossae n. sp. The bryozoan assemblage of the Las Plantas Formation is more diverse than that of the Las Aguaditas Formation. Fourteen species are restricted to the Las Plantas Formation, five species occur in both formations, and one species is restricted to the Las Aguaditas Formation. Erect growth forms are dominant in the studied fauna. The majority of bryozoan taxa display palaeobiogeographic relations to Sandbian–Katian deposits of North America, with two species also known from the Katian of Europe.
ISSN:0022-3360
1937-2337
DOI:10.1666/12-024.1