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Taxonomy
Maryvillia omega was named by Lochman and Hu (1962). Its type specimen is U.S.N.M. 138260e, an exoskeleton, and it is a 3D body fossil. Its type locality is ⅛ mile north of the Gallatin River along the Pilgrim cliff, Logan, which is in a Steptoean offshore limestone in the Pilgrim Formation of Montana.
Synonymy list
| Year | Name and author |
|---|---|
| 1962 | Maryvillia omega Lochman and Hu pp. 435-436 figs. pl. 70 f. 1-21 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Maryvillia omega Lochman and Hu 1962
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Lochman and C. Hu 1962 | Cranidium equiconvex (sag and tr); glabella convex, tapered forward to a narrowly to broadly rounded front, no lateral furrows, occipital furrow shallow, occipital ring low, frontal area somewhat more than 4 glabellar length, concave, anterior border furrow nearly obsolete; fixigenae downsloping, palpebral area flat, about one-half glabellar width at midline, palpebral lobe small, opposite anterior ? of glabella, furrow obsolete, eye ridge very faint, posterior area triangular, 3 length of occipital ring with bluntly rounded end, broad shallow posterior furrow. Librigena not known.
Pygidium broad-triangular, axis narrow, tapered 6 length to narrow rounded end, dorsal furrow shallow, all others obsolete on outer surface, present on inner, seven axial rings and terminal, pleural platform same width anteriorly as axis, narrowing posteriorly, slightly convex, horizontal, 5-6 narrow pleural segments crossed by narrow pleural furrows, and separated by broader interpleural grooves, pleural furrows end at border furrow but grooves may run onto border, narrow curved border furrow, border very narrow anteriorly, steep, widening posteriorly with moderate slope, outer edge becomes horizontal in sag. line. Outer surface smooth, inner surface punctate. |