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Taxonomy
Hemiarges leviculus was named by Bradley (1930). Its type specimen is WM 28042, a cephalon/head (cranidium), and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1930 | Hemiarges leviculus Bradley pp. 271 - 272 figs. pl. 29 f. 22 |
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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.
†Hemiarges leviculus Bradley 1930
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. H. Bradley 1930 | Cephalon subelliptical in outline, weakly and evenly convex, about four-fifths as long as wide. The anterior and lateral slopes of the glabella are somewhat steeper than the posterior slope. Median lobe slightly more elevated than the lateral lobes, evenly convex from front to back. The first glabellar furrows are narrow but sharp, converging very little posteriorly, thus making the median lobe almost parallel sided, becoming obsolete at the base of the lateral lob,ls. The lateral lo·bes· are well circumscribed on the inside and in front and slope laterally to the margin of the shield. Second glabellar furrows obsolete; third glabellar furrows shallow, poorly defining the fourth glabellar lobes. Occipital lobes very small, showing as a slight intumescence on the bases of the fourth glabellar lobes. Occipital furrow straight, deep, wider than the glabellar furrows. Anterior margin of the shield is flattened and extends well around the lateral lobes before being intercepted by the facial suture. Fixed cheeks poorly preserved, but probably small and non-protruding. Surface pustulose. Known only from the cranidium. |
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class | |||||
| References: Aberhan et al. 2004, Whittington et al. 1997, Harrington et al. 1959 | |||||
Age range: base of the Chatfieldian to the top of the Edenian or 453.80000 to 450.20000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chatfieldian | USA (Missouri) | Hemiarges leviculus (154953) | |
| Edenian | Canada (Northwest Territories) | Hemiarges leviculus (24636) |