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Brontomerus
Taxonomy
Brontomerus was named by Taylor et al. (2011). It was considered monophyletic by Taylor et al. (2011).
It was considered a nomen dubium by D'Emic (2012).
It was assigned to Camarasauromorpha by Taylor et al. (2011); and to Somphospondyli by Mannion et al. (2013).
It was considered a nomen dubium by D'Emic (2012).
It was assigned to Camarasauromorpha by Taylor et al. (2011); and to Somphospondyli by Mannion et al. (2013).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Brontomerus Taylor et al. p. 78 |
| 2013 | Brontomerus Mannion et al. |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. P. Taylor et al. 2011 | As for type and only species:
Preacetabular lobe 55% of total ilium length, longer than in any other sauropod; preacetabular lobe directed anterolaterally at 30° relative to the sagittal plane, but straight in dorsal view and vertically oriented; postacetabular lobe reduced to near absence; ischiadic peduncle reduced to very low bulge; ilium proportionally taller than in any other sauropod—height is 52% of total length, compared with a maximum of 45% in other sauropods. If the tentatively referred elements do belong to the same species as the holotype, then the following additional characters also diagnose the new taxon: presacral vertebrae camellate; mid−to−posterior caudal vertebrae with elongate pre− and postzygapophyseal rami, having the postzygapophyseal facets hanging below the level of the ramus; first dorsal rib with expanded, dorsally oriented articular facets, laterally curving shaft, and ventrally directed pneumatic foramen in head; acromion expansion of scapula pronounced and steep, but not forming acromion fossa; dorsal and ventral margins of scapular blade “stepped”; sternal plates crescentic, and three times as long as broad. Unambiguous autapomorphies distinguishing Brontomerus from the root of the polytomy in which it is recovered in the strict consensus of most parsimonious trees in the phylogenetic analysis below: character 184, ratio of centrum length:height in middle caudal vertebrae grater or equal to 2.0; 185, sharp ridge on lateral surface of middle caudal centra at arch−body junction absent; 212, posterior end of scapular body racquet−shaped (dorsoventrally expanded); 261, in lateral view, the most anteroventral point on the iliac preacetabular lobe is also the most anterior point (preacetabular lobe is pointed); 264, projected line connecting articular surfaces of ischiadic and pubic peduncles of ilium passes ventral to ventral margin of postacetabular lobe of ilium. |
Measurements
No measurements are available
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| Source: infrao = infraorder | |||||
| Reference: Marsh 1875 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Aptian - Albian | USA (Utah) | Brachiosauridae indet. (97951) |