Eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of Argentina

A new genus and species of fertile organ in organic connection with foliage from Early Carboniferous sediments of Argentina is described. The specimen displays single preovule-like structures borne terminally on a forked branch system in the place of a normal pinnule, with both sterile and fertile p...

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Detalles Bibliográficos
Autor principal:	Césari, S.N.
Formato:	JOUR
Materias:	Argentina Early Carboniferous Gondwana Pteridosperm Carboniferous Eonotosperma arrondoi pteridosperm
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00027014_v34_n2_p169_Cesari
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00027014_v34_n2_p169_Cesari
record_format	dspace
spelling	todo:paper_00027014_v34_n2_p169_Cesari2023-10-03T13:52:35Z Eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of Argentina Césari, S.N. Argentina Early Carboniferous Gondwana Pteridosperm Carboniferous Eonotosperma arrondoi Gondwana pteridosperm Argentina A new genus and species of fertile organ in organic connection with foliage from Early Carboniferous sediments of Argentina is described. The specimen displays single preovule-like structures borne terminally on a forked branch system in the place of a normal pinnule, with both sterile and fertile pinnules produced on the same pinna. The ovules are 0.7 cm long and consist of a whorl of 5-6 sterile lobes that are fused only at the base. Distally, the lobes flare outward or remain straight. While the ovules are externally similar to Genomosperma Long, the rachial fragment resembles the form genus Diplothmema Stur. Although the sterile foliage in Argentina has been described as D. bodenbenderi (Kurtz) Césari, a similar foliage type occurs in the early Late Carboniferous of Peru, but in association with a different type of preovule. As this suggests D. bodenbenderi-type foliage bore different ovules and possibly represents a number of different taxa. Eonotosperma arrondoi gen. et sp. nov. is proposed here for the fertile material from the Lower Carboniferous of Argentina and its frond is described. Eonotosperma arrondoi now represents the oldest and southernmost occurrence of early seed plant fertile remains in western Gondwana, and adds to our knowledge of ovule attachment in early pteridosperms. Fil:Césari, S.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00027014_v34_n2_p169_Cesari
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Argentina Early Carboniferous Gondwana Pteridosperm Carboniferous Eonotosperma arrondoi Gondwana pteridosperm Argentina
spellingShingle	Argentina Early Carboniferous Gondwana Pteridosperm Carboniferous Eonotosperma arrondoi Gondwana pteridosperm Argentina Césari, S.N. Eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of Argentina
topic_facet	Argentina Early Carboniferous Gondwana Pteridosperm Carboniferous Eonotosperma arrondoi Gondwana pteridosperm Argentina
description	A new genus and species of fertile organ in organic connection with foliage from Early Carboniferous sediments of Argentina is described. The specimen displays single preovule-like structures borne terminally on a forked branch system in the place of a normal pinnule, with both sterile and fertile pinnules produced on the same pinna. The ovules are 0.7 cm long and consist of a whorl of 5-6 sterile lobes that are fused only at the base. Distally, the lobes flare outward or remain straight. While the ovules are externally similar to Genomosperma Long, the rachial fragment resembles the form genus Diplothmema Stur. Although the sterile foliage in Argentina has been described as D. bodenbenderi (Kurtz) Césari, a similar foliage type occurs in the early Late Carboniferous of Peru, but in association with a different type of preovule. As this suggests D. bodenbenderi-type foliage bore different ovules and possibly represents a number of different taxa. Eonotosperma arrondoi gen. et sp. nov. is proposed here for the fertile material from the Lower Carboniferous of Argentina and its frond is described. Eonotosperma arrondoi now represents the oldest and southernmost occurrence of early seed plant fertile remains in western Gondwana, and adds to our knowledge of ovule attachment in early pteridosperms.
format	JOUR
author	Césari, S.N.
author_facet	Césari, S.N.
author_sort	Césari, S.N.
title	Eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of Argentina
title_short	Eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of Argentina
title_full	Eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of Argentina
title_fullStr	Eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of Argentina
title_full_unstemmed	Eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of Argentina
title_sort	eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of argentina
url	http://hdl.handle.net/20.500.12110/paper_00027014_v34_n2_p169_Cesari
work_keys_str_mv	AT cesarisn eonotospermaarrondoicesarigenetspnovapteridospermfromtheearlycarboniferousofargentina
_version_	1807316053959639040

Eonotosperma arrondoi césari gen. et sp. nov., a pteridosperm from the early carboniferous of Argentina

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