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Tumulosternum ortegai Ferratges, 2024 Eoactinotocarcinus n. gen. Eoactinotocarcinus tetracornis (Ferratges, Ortega, Fernández, Moreno & Maza, 2014) in Ferratges, 2024 |
Abstract
Spider crabs (superfamily Majoidea Samouelle, 1819) represent a highly diverse group within Eubrachyura de Saint Laurent, 1980. This study re-examines the species “Periacanthus” tetracornis Ferratges, Ortega Fernández, Moreno and Maza, 2014 (Roda Formation, lower Eocene of Spain) which was previously consider as a member of Epialtidae MacLeay, 1838 and it is included as a new genus of majoid crabs, Eoactinotocarcinu n. gen. Additionally, Tumulosternum ortegai n. sp. is described from the same geological unit expanding the distribution of this genus to the southern Pyrenees. These taxa were found in siliciclastic facies co-occurring with a diverse assemblage of decapod crustaceans and other invertebrates. These facies are interpreted as deposited in a prodelta environment supporting the idea of such environments as highly diversified areas of decapods during the Eocene. These new taxa represent the earliest known record of the Subfamily Actinotocarcininae Jenkins, 1974 and the genus Tumulosternum respectively.
Keywords: Malacostraca, Decapoda, benthonic, taxonomy, Ypresian
Tumulosternum ortegai
Eoactinotocarcinus tetracornis
Fernando Ari Ferratges. 2024. New Spider Crabs (Brachyura, Majoidea) from the early Eocene of Spain with A Reassignment of the Species “Periacanthus” tetracornis. Geologica Acta. 22.12, 1-13, I-II.
Un nuevo género y una nueva especie de cangrejos araña en el Pirineo Aragonés
