The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina

Three species of Karakaschiceras, K. attenuatus (Behrendsen, 1892), K. neumayri (Behrendsen, 1892), and K. lycoris (Leanza and Giovine, 1949), and one species of Neohoploceras, N. arnoldi (Pictet and Campiche, 1860), are described and figured from the Valanginian strata of the Neuquen basin in west-...

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Detalles Bibliográficos
Autor principal: Aguirre-Urreta, M.B.
Formato: JOUR
Materias:
Ammonite
Karakaschiceras
Neocomitidae
Neohoploceras
Valanginian
Argentina
Ammonoidea
Cephalopoda
Lycoris
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00223360_v72_n1_p39_AguirreUrreta
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00223360_v72_n1_p39_AguirreUrreta2023-10-03T14:31:37Z The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina Aguirre-Urreta, M.B. Ammonite Karakaschiceras Neocomitidae Neohoploceras Valanginian Argentina Ammonoidea Cephalopoda Karakaschiceras Karakaschiceras Lycoris Neocomitidae Neohoploceras Neohoploceras Three species of Karakaschiceras, K. attenuatus (Behrendsen, 1892), K. neumayri (Behrendsen, 1892), and K. lycoris (Leanza and Giovine, 1949), and one species of Neohoploceras, N. arnoldi (Pictet and Campiche, 1860), are described and figured from the Valanginian strata of the Neuquen basin in west-central Argentina. The large collection of fossils available for study shows wide intraspecific variation regarding ornament and whorl section in Karakaschiceras neumayri and Neohoploceras arnoldi, casting some doubts on the current systematics applied to species of these genera. The biostratigraphic position of the four species in the Neuquen basin corresponds to the Karakaschiceras attenuatus Subzone of the Olcostephanus atherstoni Zone. This subzone is correlated with the Mediterranean Karakaschiceras inostranzewi and Saynoceras verrucosum zones of Europe at the base of upper Valanginian sections. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00223360_v72_n1_p39_AguirreUrreta
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ammonite
Karakaschiceras
Neocomitidae
Neohoploceras
Valanginian
Argentina
Ammonoidea
Cephalopoda
Karakaschiceras
Karakaschiceras
Lycoris
Neocomitidae
Neohoploceras
Neohoploceras
spellingShingle Ammonite
Karakaschiceras
Neocomitidae
Neohoploceras
Valanginian
Argentina
Ammonoidea
Cephalopoda
Karakaschiceras
Karakaschiceras
Lycoris
Neocomitidae
Neohoploceras
Neohoploceras
Aguirre-Urreta, M.B.
The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
topic_facet Ammonite
Karakaschiceras
Neocomitidae
Neohoploceras
Valanginian
Argentina
Ammonoidea
Cephalopoda
Karakaschiceras
Karakaschiceras
Lycoris
Neocomitidae
Neohoploceras
Neohoploceras
description Three species of Karakaschiceras, K. attenuatus (Behrendsen, 1892), K. neumayri (Behrendsen, 1892), and K. lycoris (Leanza and Giovine, 1949), and one species of Neohoploceras, N. arnoldi (Pictet and Campiche, 1860), are described and figured from the Valanginian strata of the Neuquen basin in west-central Argentina. The large collection of fossils available for study shows wide intraspecific variation regarding ornament and whorl section in Karakaschiceras neumayri and Neohoploceras arnoldi, casting some doubts on the current systematics applied to species of these genera. The biostratigraphic position of the four species in the Neuquen basin corresponds to the Karakaschiceras attenuatus Subzone of the Olcostephanus atherstoni Zone. This subzone is correlated with the Mediterranean Karakaschiceras inostranzewi and Saynoceras verrucosum zones of Europe at the base of upper Valanginian sections.
format JOUR
author Aguirre-Urreta, M.B.
author_facet Aguirre-Urreta, M.B.
author_sort Aguirre-Urreta, M.B.
title The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_short The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_full The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_fullStr The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_full_unstemmed The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_sort ammonites karakaschiceras and neohoploceras (valanginian neocomitidae) from the neuquen basin, west-central argentina
url http://hdl.handle.net/20.500.12110/paper_00223360_v72_n1_p39_AguirreUrreta
work_keys_str_mv AT aguirreurretamb theammoniteskarakaschicerasandneohoplocerasvalanginianneocomitidaefromtheneuquenbasinwestcentralargentina
AT aguirreurretamb ammoniteskarakaschicerasandneohoplocerasvalanginianneocomitidaefromtheneuquenbasinwestcentralargentina
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