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Eopeachella is an extinct genus of trilobites, fossil marine arthropods, with species of probably small size (largest headshield (or cephalon) long), entire, articulate specimens have not yet been found. It lived during the Toyonian stage (Upper "Olenellus"-zone), in what is today the South-Western United States. "Eopeachella angustispina" is the only known species in this genus (i.e. the genus is monotypic).
Etymology.
"Eopeachella" is named for its early occurrence compared to and presumed closeness to "Peachella". The species epithet "angustispina" refers to the slender genal spines compared to those in the species of "Peachella".
Description.
Only the cephalon of "Eopeachella" is known. It is a small sized biceratopsid trilobite, that exhibits the effaced cephalic features that are typical for that family. "Eopeachella" has short, stout genal spines, which are somewhat inflated at base and terminate in pointed tips and inflated lateral cephalic borders. ;br ;
The cephalon is semi-circular in outline with short, strongly inflated rounded spines. The central area of the cephalon (or glabella) is elongated, reaching the anterior border, and hourglass shaped. Its features are effaced, showing only shallow furrows.
Differences with some other Biceratopsinae.
Some other Biceratopsinae share some of the most eye catching features of "Eopeachella". These differ however in the following characteristics. "Biceratops nevadensis", "Emigrantia" and "Peachella" all have more extremely effaced cephalic features. "Biceratops" lacks genal spines. In "Emigrantia" the genal spines are longer than the cephalon and attach halfway down its side (or lateral margin). "Peachella" has club-like genal spines. The genal spine bases and lateral cephalic border are also inflated in "Paranephrolenellus inflatus", but this species differs from "Eopeachella" in having clearly visible glabellar furrows, and strongly divergent ocular lobes.
Relations with other biceratopsids.
"Eopeachella" first occurs in the fossil record before both "Peachella" species, although it overlaps with "P. iddingsi". The thick, tapered, genal spines and shallow but clear glabellar furrows of "E. angustispina" are intermediate between the "Peachella" species that have club-like strongly inflated genal spines and more radically effaced cephalic features and ancestral olenelloidea.
Distribution.
Specimens of "Eopeachella angustispina" have been collected from the Delamar Mountains in Lincoln County, Nevada.
Habitat.
"E. angustispina" was probably a marine bottom dweller, like all Olenellina.
Ecology.
"E. angustispina" occurs together with " Olenellus nevadensis", "Peachella iddingsi" and "Bristolia sp.".
References.
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