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Lomasuchus Temporal range: Late Cretaceous, Santonian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauria
Clade:	Pseudosuchia
Clade:	Crocodylomorpha
Clade:	Crocodyliformes
Clade:	†Notosuchia
Clade:	†Sebecosuchia
Clade:	†Sebecia
Family:	†Peirosauridae
Genus:	†Lomasuchus Gasparini et al., 1991
Type species
†Lomasuchus palpebrosus Gasparini et al., 1991

Lomasuchus is an extinct genus of peirosaurid notosuchian known from the Late Cretaceous (Santonian stage) of Neuquén Province, western central Argentina. It contains a single species, Lomasuchus palpebrosus.^[1]^[2]

It is known only from the holotype MOZ 4084 PV which was found in the Loma de la Lata locality of the Neuquén Province, Patagonia. It was originally reported as collected from sediments of the Rio Colorado Subgroup, Neuquén Group. Later, Hugo and Leanza (2001) noted that this specimen was actually collected from the underlying Portezuelo Formation of the Rio Neuquén Subgroup, Neuquén Group. More recent stratigraphic work on this area identified that horizon as belonging to the younger, Coniacian-age, Plottier Formation of the Rio Neuquén Subgroup.^[3] This horizon is currently considered to pertain to the Santonian-age Bajo de la Carpa Formation of the Rio Colorado Subgroup.^[2]

Lomasuchus had a deep, narrow snout characteristic of peirosaurids. The serrated teeth were compressed, although not to the extent seen in other related genera such as Peirosaurus. Many similarities can be seen between its morphology and that of the related Uberabasuchus, such as the narrow snout and a groove at the maxilla-premaxilla contact that accommodated for an enlarged fourth mandibular tooth. The two genera are distinguished from one another on the basis of several features, including the shape of the orbits.^[4]

Lomasuchus lends its name to a subfamily of peirosaurids called the Lomasuchinae. Lomasuchinae was constructed in 2004 and included Lomasuchus (the type genus), and a tribe called Mahajangasuchini, which included Mahajangasuchus and Uberabasuchus. Mahajangasuchus is now placed outside Peirosauridae in a different family, Mahajangasuchidae.^[4]

References

^ Gasparini, Z; Chiappe L. M; Fernandez, M (1991). "A new Senonian peirosaurid (Crocodylomorpha) from Argentina and a synopsis of the South American Cretaceous crocodilians". Journal of Vertebrate Paleontology. 11 (3): 316–333. Bibcode:1991JVPal..11..316G. doi:10.1080/02724634.1991.10011401.
^ ^a ^b Agustín G. Martinelli; Joseph J.W. Sertich; Alberto C. Garrido; Ángel M. Praderio (2012). "A new peirosaurid from the Upper Cretaceous of Argentina: Implications for specimens referred to Peirosaurus torminni Price (Crocodyliformes: Peirosauridae)". Cretaceous Research. 37: 191–200. Bibcode:2012CrRes..37..191M. doi:10.1016/j.cretres.2012.03.017.
^ Diego Pol & Zulma Brandoni de Gasparini (2007). "Crocodyliformes". In: Patagonian Mesozoic Reptiles. Gasparini, Z., Coria, R., & Salgado, L. (Eds.). Indiana University Press: 116–142.
^ ^a ^b Ismar de Souza Carvalho; Luiz Carlos Borges Ribeiro; Leonardo dos Santos Avilla (2004). "Uberabasuchus terrificus sp. nov., a New Crocodylomorpha from the Bauru Basin (Upper Cretaceous), Brazil" (PDF). Gondwana Research. 7 (4): 975–1002. Bibcode:2004GondR...7..975C. doi:10.1016/S1342-937X(05)71079-0. Archived from the original (PDF) on 2011-07-06.

Ziphosuchia

Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Mesoeucrocodylia
Clade: Metasuchia

Pseudosuchia

see Pseudosuchia
Ziphosuchia	see below↓

Ziphosuchia

Microsuchus?

Sebecia

Mahajangasuchidae

Kaprosuchus
Mahajangasuchus

Sebecidae

Peirosauridae

Amargasuchus Fortignathus? Miadanasuchus Stolokrosuchus?
Pepesuchinae	Barreirosuchus Caririsuchus Epoidesuchus Itasuchus Pepesuchus Roxochampsa
Peirosaurinae	Antaeusuchus Barcinosuchus Barrosasuchus Bayomesasuchus Colhuehuapisuchus Gasparinisuchus Hamadasuchus Kinesuchus Lomasuchus Montealtosuchus Patagosuchus Peirosaurus Pepesuchus Rukwasuchus Uberabasuchus

Notosuchia	see below↓

Notosuchia

Anatosuchus? Araripesuchus Comahuesuchus? Libycosuchus Razanandrongobe? Simosuchus Uruguaysuchus
Candidodontidae?	Candidodon Lavocatchampsa Malawisuchus Pakasuchus

Xenodontosuchia

Baurusuchia

Baurusuchidae

Cynodontosuchus Gondwanasuchus Pabwehshi
Baurusuchinae	Aphaurosuchus Aplestosuchus Baurusuchus Stratiotosuchus
Pissarrachampsinae	Campinasuchus Pissarrachampsa Wargosuchus

Sphagesauria

Notosuchidae

Sphagesauridae

Adamantinasuchus Labidiosuchus Yacarerani
Sphagesaurinae	Armadillosuchus Caryonosuchus Sphagesaurus
Caipirasuchinae	Caipirasuchus Morrinhosuchus

Related categories
Terrestrial crocodylomorphs

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