Bergamia prima Trilobite 1.jpg

Bergamia prima Trilobite

Teretiusculos Bizone, Penderig, Builth, Wales
Ordovician Age (485.4 -443.8 million years ago )
Trincleioid trilobites are highly specialized, but fall within the Asaphida via their asaphoid protaspides and the presence of the ventral median suture in at least the more primitive representatives of the superfamily. Cephalon: Opisthoparian or marginal facial sutures, generally eyeless; glabella typically convex and pyriform, with 3 or fewer pairs of furrows, preoccipital glabellar tubercle sometimes present; usually long genal spines. Thorax: usually 5 – 8 segments, but only 2-3 segments in progenetic Raphiophoridae, and up to 30 in Seleneceme (Alsataspididae), with long, narrow adaxial pleurae. Pygidium: wide, typically triangular, narrow axis extending to posterior margin, border strongly declined, doublure very narrow. Other: Asaphoid protaspis shows common ancestry; Raphiophorus is the only Trinucleioid (indeed the only representative of the order Asaphida) that continues beyond the Ordovician-Silurian boundary. Families: Alsataspididae, Dionididae, Orometopidae, Raphiophoridae, Trinucleidae, Representative Genera: Ampyxina, Bergamia, Cnemidopyge, Cryptolithus, Dionide, Hapalopleura, Orometopus, Protolloydolithus, Raphiophorus, Seleneceme, Trinucleus.
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Asaphida
Family: †Trinucleidae
Genus: †Bergamia
Species: †prima