Nejdia (Hildoceratidae, Ammonoidea) in the Toarcian (Lower Jurassic) of the Iberian Peninsula. Systematics, phylogenetic affinities and palaeobiogeography

ABSTRACT

The genus Nejdia Arkell, 1952 has rarely been cited outside the Arabo-Malgach Province and, few specimens have been recorded outside this province. On the Iberian Peninsula it has been identified in three sites, two of these in the southwest of the Iberian Basin and one in the Lusitanian Basin. Three species are described: N. cf. bramkampi, N. pseudogruneri and N. duartei sp. nov., Following the indications of the journal the new species was recorded in the ZooBank recorded in the interval between the upper part of the Serpentinum Chronozone, where they are associated with Harpoceras falciferum and Orthildaites douvillei and the lower part of the Bifrons Chronozone containing Hildoceras sublevisoni. In all the Iberian outcrops having a record of Nejdia, the fossils constitute ademic or parademic taphonic entities, as there is no evidence to indicate that the known populations inhabited an area close to the southwest sector of the Iberian Range, or the northern part of the Lusitanian Basin, where were recorded. With the specimens obtained in Portugal, the known geographic distribution of the genus Nejdia is extended, currently comprising, apart from the Arabo-Malgach Province, the Iberian Range and the Lusitanian Basin in the Submediterranean Province, and the Middle Atlas and the Apennines in the Mediterranean Province.

url:lsid:zoobank.org:pub:BEE9F42E-92FE-483E-9CC1-B4B8FB927E82

KEYWORDS:

• Bouleiceratinae
• Chronostratigraphy
• Lower-Middle Toarcian
• Iberian Basin
• Lusitanian Basin

Acknowledgements

The present research is a contribution to the IGCP-655 Toarcian Oceanic Anoxic Event: Impact on marine carbon cycle and ecosystems, and to Research Group PBM-910431 (Complutense University of Madrid). It was supported by project CGL2015-66604-R (MINECO, Government of Spain). We wish to thank Dr. L. V. Duarte for his help in collecting the Portuguese specimens of Nejdia and for the constructive observations he provided regarding the stratigraphy of the lower Toarcian in the Lusitanian Basin; we are also grateful to Prof. Dr. S. R. Fernández-López for providing the two specimens of Nejdia from El Coscojar and for his valuable observations on the state of conservation of the fossils; our thanks to Dr. G. Meléndez Hevia for providing a specimen of Bouleiceras from Entrambasaguas to both anonymous reviewers for their constructive comments than have improved the manuscript to Íñigo Vitón García for his support with the graphics and to Carlos Alonso Recio for his impeccable photography and to Cormac de Brun for reviewing the English version.

Disclosure statement

No potential conflict of interest was reported by the authors.