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Taxonomy
Blountina triangularis was named by Lochman and Duncan (1944) [Blountina triangularis Lochman in Lochman & Duncan, p. , ]. Its type specimen is USNM 127159, a cephalon/head (cranidium), and it is a 3D body fossil. Its type locality is Horizon 9.2. Half Moon Pass, Big Snowy Mountains, which is in a Marjumian marine horizon in the Pilgrim Formation of Montana.
It was recombined as Maryvillia triangularis by Armstrong et al. (2020).
It was recombined as Maryvillia triangularis by Armstrong et al. (2020).
Synonymy list
| Year | Name and author |
|---|---|
| 1944 | Blountina triangularis Lochman and Duncan p. 57 figs. pl. 8, figs 12–18. |
| 2020 | Maryvillia triangularis Armstrong et al. p. 23 figs. Plates 24, 25 |
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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 triangularis Lochman and Duncan 1944
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Armstrong et al. 2020 | Anterior border narrows abaxially with well-incised border furrow; steeply sloping preglabellar field. Moderately convex glabella that narrows (tr.) anteriorly to a broadly rounded front, and very shallow axial furrows. Posterolateral projections long and triangular, with posteriorly deflected margins. Pygidium subtriangular in outline with faint border, axial, and pleural furrows that all weaken posteriorly. Pitting (corresponding to small projections on underside of exoskeleton) preserved on internal mould. |