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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Amphicoelias brontodiplodocus
The taxon was first described in the September 2010 version of this Report, but it is not clear whether that version was ever physically printed. If not, then the December 2010 version (ref 41031, which was printed) would become the correct reference for the designation of this taxon. However, in that later version, the species is designated only as Amphicoelias "brontodiplodocus" - in quotes - with a diagnosis but without a holotype (which is given as specimen DQ-BS in the September 2010 Report). This later report also states "The use of A. "brontodiplodocus" is temporary and for convenience in discussions presented herein, and not as an official nomenclatural declaration."
| Year | Name and author |
|---|---|
| 2010 | Amphicoelias brontodiplodocus Galiano and Albersdörfer p. 6 figs. 4-16 |
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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.
| Reference | Diagnosis | |
|---|---|---|
| H. Galiano and R. Albersdörfer 2010 | Differs from Amphicoelias altus in the on of characters: Basipterygoid recess present, neural spine bifurcate past the 9th cervical, cervical ribs elongate, overlap, past centrum length, ossified calcaneum present, claws tapered. Axial skeleton in males generally less elongated with cervical ribs hypertrophic; unfused clavicles present, lack of pleurocoels on the anterior caudals, and lack of ventral sculpting on mid-caudal vertebrae until adult stage, and prezygapophysis on caudal vertebrae short. | |
| H. Galiano and R. Albersdörfer 2010 | Amphicoelias “brontodiplodocus” differs from Amphicoelias altus, (as defined to include the genera Diplodocus, Apatosaurus and Barosaurus), essentially in the presence of having more primitive characters. The following combination of plesiomorphies and apomorphies characterizes the species: basipterygoid recess present; antorbital fenestra proportionately small; pear shaped orbital cavity pronounced; proatlas present above occipital condyles; neural spine bifurcate past the 9th cervical; cervical ribs elongate, overlapping past centrum length; ossified calcaneum present; claws tapered; axial skeleton in males generally less elongated with cervical ribs hypertrophic; unfused clavicles present; lack of pleurocoels on the anterior caudals; lack of ventral sculpting on mid-caudal vertebrae until adult stage; prezygapophysis on caudal vertebrae short. The femur in A. altus is proportionately longer than in A. " brontodiplodocus". Amphicoelias “brontodiplodocus”
differs from Amphicoelias “Suuwassea” emilieae, in lacking the following characters: no post parietal foramen, “optic” foramen not conjoined, neural spine bifurcation past 9th, and neural spines anteriorly positioned on cervical centra C 3-5. |
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| Source: g = genus, infrao = infraorder | |||||
| References: Peczkis 1995, Marsh 1875 | |||||
Age range: base of the Late/Upper Oxfordian to the top of the Early/Lower Kimmeridgian or 161.20000 to 150.80000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Oxfordian - Early/Lower Kimmeridgian | USA (Wyoming) | Amphicoelias brontodiplodocus (type locality: 126540) |