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Chadititan calvoi
Taxonomy
Chadititan calvoi was named by Agnolin et al. (2025). Its type specimen is MPCN-Pv 1034, a partial skeleton (5 proximal caudal vertebrae, 4 distal caudal vertebrae, proximal end of left and right humeri, proximal end of right and left ulnae, distal end of left ulna, di), and it is a 3D body fossil. Its type locality is Marín family Farm, which is in a Campanian fluvial mudstone/sandstone in the Anacleto Formation of Argentina. It is the type species of Chadititan.
Synonymy list
| Year | Name and author |
|---|---|
| 2025 | Chadititan calvoi Agnolin et al. p. 234 figs. 12-19 |
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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.
†Chadititan calvoi Agnolin et al. 2025
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. Agnolin et al. 2025 | Very small and gracile rinconsaur titanosaur (preserved femoral length of 73.5 cm) diagnosed on the basis of the following combination of characters: straight-shafted femur lacking a lateral protuberance (shared with Muyelensaurus; poorly developed in Rinconsaurus and present and forming a shelflike prominence in Pitekunsaurus; Calvo & González Riga, 2003; Filippi & Garrido, 2008), femoral head dorsomedially projected, far from the level of the greater trochanter (shared with Rinconsaurus and Muyelensaurus; not dorsally oriented in Pitekunsaurus; Filippi & Garrido, 2008), gracile humerus (robust, with expanded proximal end in Rinconsaurus and Narambuenatitan; Calvo & González Riga, 2003; Filippi et al., 2011) with very deep anterior excavation having well-defined dorsal and lateral margins, low olecranon on ulna (as in Narambuenatitan and Muyelensaurus; prominent and bump-like in Pitekunsaurus; Filippi & Garrido, 2008), procoelous caudals (amphicoelous-biconvex or amphicoelous-opisthocoelous-biconvex caudal centra in Rinconsaurus and Pitekunsaurus; Calvo & González Riga, 2003; Filippi & Garrido, 2008), and anterior caudals with neural arch continuous with the anterior margin of the vertebral centrum (shared with Muyelensaurus; separated by a notch and posterior to the anterior margin of the vertebral centrum in Pitekunsaurus, Rinconsaurus, and Overosaurus; Calvo & González Riga, 2003; Calvo et al., 2007; Filippi & Garrido, 2008). In spite that Chadititan calvoi shows few overlapping materials with Overosaurus, the anterior and posterior caudals of Overosaurus are notably box-like, shorter and transversely as wide or wider than long, whereas in Chadititan vertebrae are elongate and transversely compressed (width/length index is between 0.5 to 0.4 in anterior caudals of Chadititan; 0.7 to 0.78 in anterior caudals of Overosaurus; see Coria et al., 2013). |
Measurements
No measurements are available
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| Source: infrao = infraorder | |||||
| Reference: Marsh 1875 | |||||