Research paper

Systematics, distribution and paleoecology of the genera Genocidaris Agassiz, 1869 and Arbacina Pomel, 1869 (Trigonocidaridae, Echinoidea) 

Società Reggiana Scienze Naturali, Reggio Emilia, Italy.

Museo de Alcalá de Guadaíra (Sección de Paleontogía), C/ Juez Pérez Díaz S/N. Alcalá de Guadaíra, Seville, Spain;
Corresponding author


The relationship among members of the echinoid genera Genocidaris and Arbacina (family Trigonocidaridae) is studied. Distinctive morphological characters of these two genera are discussed, based on recent specimens from the Caribbean and the Mediterranean and on fossils collected from 34 Miocene, Pliocene and Pleistocene European localities. Geographic and biostratigraphic distributions of the two genera and their paleoecological requirements are reported. Based on this analysis, Arbacina is considered a junior synonym of the genus Genocidaris.

Key words:  Echinoidea, Trigonocidaridae, Oligocene to recent, distribution, paleogeography.

How to cite: Borghi, E. & Bajo, I. 2022. Systematics, distribution and paleoecology of the genera Genocidaris Agassiz, 1869 and Arbacina Pomel, 1869 (Trigonocidaridae, Echinoidea). Spanish Journal of Palaeontology, 37(1), 69-86.

Received 31 July 2021, Accepted 30 March 2022, Published online 10 May 2022