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Ibirania parva
Taxonomy
Ibirania parva was named by Navarro et al. (2022). Its type specimen is LPP-PV-0200-0207, a set of postcrania, and it is a 3D body fossil. Its type locality is Sítio dos Irmãos Garcia, which is in a Santonian/Campanian terrestrial sandstone in the São José do Rio Preto Formation of Brazil. It is the type species of Ibirania.
Synonymy list
| Year | Name and author |
|---|---|
| 2022 | Ibirania parva Navarro 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.
†Ibirania parva Navarro et al. 2022
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. A. Navarro et al. 2022 | titanosaurian that can be distinguished from all other titanosaurian taxa by the following autapomorphies: (1) dorsal vertebrae with thick (almost “rod-shaped”) PRSL bearing an additional prominent crest at mid-height; (2) dorsal vertebrae with thick SPRL that surpasses half of PRSL height. In the anterior elements the SPRL extends parallelly to the PRSL, whereas in the posterior ones they their ventral end as a tripartite laminae; (3) posterior dorsal vertebrae with subparallel anterior SPDL and posterior SPDL, with the medial extremity of posterior SPDL projecting dorsally beyond the level of the anterior lamina, and forming a ventral contact with incipient aliform processes; (4) single CPRL in posterior dorsal vertebrae with expanded dorsal and ventral extremities, forming a thin anterolateral rim to the CPRF; (5) posterior dorsal vertebrae with a SPOL bearing two rami (med. SPOL and lat. SPOL), with the lateral one being forked due to the presence of an enlarged pneumatic foramen, forming two branches, and the medial one forming part of a median posterior ridge; (6) mid-caudal centra with a ventral hollow, but lacking longitudinal bony septa or ventrolateral ridges; (7) ulna bearing a distinctive muscular pit on the posteromedial surface of its distal half.
Our phylogenetic analysis further recovered the following additional potential autapomorphies: presence of the SPRL on entirely dorsal series (Char. 162 and 163: 0→1); divided CPOL on mid- and posterior dorsal neural arches (Char. 191: 0→1); mid- and posterior dorsal neural arches lacking the ACPL and PRPL (Chars. 192 and 193: 1→0); ventral contact of SPDL and SPOL in mid- and posterior dorsal neural arches (Chars. 203: 1→0); a med. SPOL present and forming part of the median posterior ridge on posterior dorsal neural arches (Char. 205: 0→1); laminar neural spine on posterior dorsal neural aches narrower transversely than anteroposteriorly (Char. 208: 2→0); anterior caudal centra ventrally convex (Chars. 233: 1→0); incipient ventral extension of the TPRL, not reaching the aperture of neural canal (Char. 428: 0→1). |
Measurements
No measurements are available
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| Source: infrao = infraorder | |||||
| Reference: Marsh 1875 | |||||
Age range: base of the Late/Upper Santonian to the top of the Early/Lower Campanian or 85.70000 to 72.20000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Santonian - Early/Lower Campanian | Brazil (São Paulo) | Ibirania parva (type locality: 227131 227132) Titanosauria indet. (232270) |