Lower Cretaceous bryozoans from Argentina: a 'by-catch' fauna from the Agrio Formation (Neuquén Basin)

Mesozoic bryozoans are uncommon in the Southern Hemisphere and none have yet been described from the Lower Cretaceous of Argentina. This paper describes six taxa from the lower Valanginian to the upper Hauterivian-?lower Barremian Agrio Formation of the Neuquén Basin. New species are Charixa burdona...

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Autores principales: Taylor, P.D., Lazo, D.G., Aguirre-Urreta, M.B.
Formato: JOUR
Materias:
Agrio Formation
Argentina
Bryozoans
Cretaceous
Neuquén Basin
Taxonomy
bryozoan
colony
Hauterivian
paleoenvironment
species diversity
taxonomy
Valanginian
Neuquen Basin
South America
Bryozoa
Serpulidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01956671_v30_n1_p193_Taylor
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01956671_v30_n1_p193_Taylor
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spelling todo:paper_01956671_v30_n1_p193_Taylor2023-10-03T15:09:23Z Lower Cretaceous bryozoans from Argentina: a 'by-catch' fauna from the Agrio Formation (Neuquén Basin) Taylor, P.D. Lazo, D.G. Aguirre-Urreta, M.B. Agrio Formation Argentina Bryozoans Cretaceous Neuquén Basin Taxonomy bryozoan colony Cretaceous Hauterivian paleoenvironment species diversity taxonomy Valanginian Argentina Neuquen Basin South America Bryozoa Serpulidae Mesozoic bryozoans are uncommon in the Southern Hemisphere and none have yet been described from the Lower Cretaceous of Argentina. This paper describes six taxa from the lower Valanginian to the upper Hauterivian-?lower Barremian Agrio Formation of the Neuquén Basin. New species are Charixa burdonaria sp. nov., notable for being the oldest known spine-bearing cheilostome and for constructing multilayered colonies intergrown with serpulid worms, and an unusual cyclostome described as Neuquenopora carrerai gen. et sp. nov. The poor preservation and/or lack of diagnostic gonozooids makes taxonomic assignment of the remaining bryozoans, all cyclostomes, uncertain. Apart from Multizonopora sp., a cerioporine cyclostome with bushy, ramose colonies, all of the Agrio Formation bryozoans are encrusters. In general, the Agrio Formation bryozoan fauna resembles faunas from the Neocomian and Aptian of north-west Europe. The relatively low diversity may be an artefact of collecting effort, although environmental factors may also be important, with the intergrowths between C. burdonaria and serpulids from the top of the Agrio Formation being reminiscent of some present day occurrences of primitive cheilostomes in lagoons with fluctuating salinities. Crown Copyright © 2008. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01956671_v30_n1_p193_Taylor
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Agrio Formation
Argentina
Bryozoans
Cretaceous
Neuquén Basin
Taxonomy
bryozoan
colony
Cretaceous
Hauterivian
paleoenvironment
species diversity
taxonomy
Valanginian
Argentina
Neuquen Basin
South America
Bryozoa
Serpulidae
spellingShingle Agrio Formation
Argentina
Bryozoans
Cretaceous
Neuquén Basin
Taxonomy
bryozoan
colony
Cretaceous
Hauterivian
paleoenvironment
species diversity
taxonomy
Valanginian
Argentina
Neuquen Basin
South America
Bryozoa
Serpulidae
Taylor, P.D.
Lazo, D.G.
Aguirre-Urreta, M.B.
Lower Cretaceous bryozoans from Argentina: a 'by-catch' fauna from the Agrio Formation (Neuquén Basin)
topic_facet Agrio Formation
Argentina
Bryozoans
Cretaceous
Neuquén Basin
Taxonomy
bryozoan
colony
Cretaceous
Hauterivian
paleoenvironment
species diversity
taxonomy
Valanginian
Argentina
Neuquen Basin
South America
Bryozoa
Serpulidae
description Mesozoic bryozoans are uncommon in the Southern Hemisphere and none have yet been described from the Lower Cretaceous of Argentina. This paper describes six taxa from the lower Valanginian to the upper Hauterivian-?lower Barremian Agrio Formation of the Neuquén Basin. New species are Charixa burdonaria sp. nov., notable for being the oldest known spine-bearing cheilostome and for constructing multilayered colonies intergrown with serpulid worms, and an unusual cyclostome described as Neuquenopora carrerai gen. et sp. nov. The poor preservation and/or lack of diagnostic gonozooids makes taxonomic assignment of the remaining bryozoans, all cyclostomes, uncertain. Apart from Multizonopora sp., a cerioporine cyclostome with bushy, ramose colonies, all of the Agrio Formation bryozoans are encrusters. In general, the Agrio Formation bryozoan fauna resembles faunas from the Neocomian and Aptian of north-west Europe. The relatively low diversity may be an artefact of collecting effort, although environmental factors may also be important, with the intergrowths between C. burdonaria and serpulids from the top of the Agrio Formation being reminiscent of some present day occurrences of primitive cheilostomes in lagoons with fluctuating salinities. Crown Copyright © 2008.
format JOUR
author Taylor, P.D.
Lazo, D.G.
Aguirre-Urreta, M.B.
author_facet Taylor, P.D.
Lazo, D.G.
Aguirre-Urreta, M.B.
author_sort Taylor, P.D.
title Lower Cretaceous bryozoans from Argentina: a 'by-catch' fauna from the Agrio Formation (Neuquén Basin)
title_short Lower Cretaceous bryozoans from Argentina: a 'by-catch' fauna from the Agrio Formation (Neuquén Basin)
title_full Lower Cretaceous bryozoans from Argentina: a 'by-catch' fauna from the Agrio Formation (Neuquén Basin)
title_fullStr Lower Cretaceous bryozoans from Argentina: a 'by-catch' fauna from the Agrio Formation (Neuquén Basin)
title_full_unstemmed Lower Cretaceous bryozoans from Argentina: a 'by-catch' fauna from the Agrio Formation (Neuquén Basin)
title_sort lower cretaceous bryozoans from argentina: a 'by-catch' fauna from the agrio formation (neuquén basin)
url http://hdl.handle.net/20.500.12110/paper_01956671_v30_n1_p193_Taylor
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