Lorosuchus

Lorosuchus is an extinct genus of sebecid mesoeucrocodylian known from the Río Loro Formation in Tucumán Province of northwestern Argentina.[1]

Lorosuchus
Temporal range: Paleocene (Peligran-Riochican)
~61.7–55.8 Ma
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: †Sebecosuchia
Clade: †Sebecia
Family: †Sebecidae
Genus: †Lorosuchus
Pol & Powell 2011
Type species
†Lorosuchus nodosus
Pol & Powell 2011

Discovery

Lorosuchus is known from the holotype PVL 6219, a nearly complete skull found articulated with the lower jaws and fragmentary postcranial remains. It was collected at the southern end of Medina Range, near the El Cadillal Lake from the Río Loro Formation, dating to the Thanetian or the Selandian stage of the Middle to Late Paleocene, about 61.7 to 55.8 million years ago.[2] Lorosuchus is characterized by a unique combination of characters, including five autapomorphies such as an elevated narial rim and the presence of a crest on the anteromedial margins of both premaxillae. Phylogenetically, Lorosuchus is currently recognized as the basalmost known sebecid.[1]

Etymology

Lorosuchus was named by Diego Pol and Jaime E. Powell in 2011 and the type species is Lorosuchus nodosus. The generic name is derived from Loro in reference to the Río Loro Formation in which Lorosuchus was found, and suchus, Latinized from the Greek souchos, an Egyptian crocodile god. The specific name named after the particular ornamentation of the dorsal surface of the skull, which resembles the non-related, basal archosauriform Proterochampsa.[1]

Classification

Below is a cladogram from Pol and Powell (2011) showing the placement of Lorosuchus within Sebecosuchia:[1]

 
 
 

Chimaerasuchus

 
 

Sphagesaurus

 
 
Sebecosuchia
 

Pehuenchesuchus

 
 
 

Cynodontosuchus

 
Baurusuchidae
 
 

Pabwehshi

 
 

Stratiotosuchus

 
 
 
 

Baurusuchus pachecoi

 
 

Baurusuchus salgadoensis

 
 
 
 
Bergisuchidae

Bergisuchus

 
Iberosuchidae

Iberosuchus

 
Sebecidae
 

Lorosuchus

 
 
 

Barinasuchus

 
 
 
 

Ayllusuchus

 
 

Bretesuchus

 
 
 
 

Lumbrera form

 
 

Langstonia

 
 

Sebecus

 
 

Zulmasuchus

 
 
 
 
 
 
 
 
 
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References
  1. Diego Pol and Jaime E. Powell (2011). "A new sebecid mesoeucrocodylian from the Rio Loro Formation (Palaeocene) of north-western Argentina". Zoological Journal of the Linnean Society. 163: S7–S36. doi:10.1111/j.1096-3642.2011.00714.x.
  2. Lorosuchus at Fossilworks.org
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