21046 - Top Rare Association 2 Euloma filacovi Lower Ordovician Trilobites Fezouata Fm
21046 - Top Rare Association 2 Euloma filacovi Lower Ordovician Trilobites Fezouata Fm
†Euloma filacovi, Bergeron (1888) - Trilobite
Trilobita - Ptychopariida - Eulomidae
A species defined in the French Montagne Noire that is also in the Arenigian (Floian) of Morocco. This is from the levels with Ampyx and Agerina. Positive/Negative specimen.
Note that it is very different from Bavarilla zemmourensis (Destombes,1969) the most common form with antennas, but somewhat older (from the upper Tremadocian). You can observe its unsegmented trapezoidal glabella, and its typical preglabelar structure.
Publication:
Destombes et al., 1969: "Révisions et découvertes paléontologiques (Brachiopodes, Trilobites et Graptolites) dans le Cambro-Ordovicien du Zemmour
(Mauritanie septentrionale)" Bull. Soc. géol, de France (7), XI, 1969, p. 185-206.
The Fezouata Formation occurs in the lower part of the Lower to lower Middle Ordovician Outer Feijas Group, in the western, central and eastern Anti-Atlas
Mountains, southern Morocco (Destombes et al.1985; Gutierrez-Marco & Martin 2016).
It comes from The Konservat-Lagerstätten of Lower Fezouata Fm that spans the entire Tremadoc stage of the Ordovician system and is only present in the Moroccan Anti-Atlas. The discovery of the Fezouata biota in the latest Tremadocian of southeastern Morocco has significantly changed our understanding of the early Phanerozoic radiation. The shelly fossil record shows a well-recognized pattern of macroevolutionary stasis between the Cambrian Explosion and the Great Ordovician Biodiversification Event, but the rich soft-bodied Fezouata biota paints a different evolutionary picture. The Fezouata assemblage includes a considerable component of Cambrian holdovers alongside a surprising number of crown group taxa previously unknown to have evolved by the Early Ordovician. Study of the Fezouata biota is in its early stages, and future discoveries will continue to enrich our view of the dynamics of the early Phanerozoic radiation and of the nature of the fossil record.