Figure 1.
Itaboraí Basin location (A); (B) Itaboraí Basin lithochronoestratigraphic column.
1, ankaramite layer; 2, karst channels and fissures; 3, infilling fissures (Sequence S2, Facies D); 4, main calcareous deposit (Sequence S1, Facies A, B and C); 5, alluvial deposits (Sequence S3, Facies E); 6, clastic sediments; 7, abundant vertebrate fossils; 8, rare vertebrate fossils; 9, plant remains; 10, terrestrial gastropod fossils; 11, archaeological artifacts; 12, Sahitysuchus fluminensis gen. et sp. nov. (MCT 1730-R). Stratigraphic column modified after [12], [21].
Figure 2.
Sahitysuchus fluminensis gen. et sp. nov. (MCT 1730-R), in dorsal view.
A, photo; B, illustration. 9–12th mlt, eighth to eleven left maxillary teeth; an, angular; anr, angular ridge; afo, mandibular adductor fossa; aof?, antorbital fenestra?; art, articular; bs, basisphenoid; bo, basioccipital; boc, basioccipital middle crest; bot, basioccipital basal tubera; chg, choanal groove; cq, cranio-quadrate passage; d, dentary; dhl, left hypertrophied replacement tooth; dhr, right hypertrophied dentary tooth; ec, ectopterygoid; expp, exoccipital posterior process; f, frontal; fä, foramen aereum; fcp, foramen caroticum posterius; fic, foramen intermandibularis caudalis; fme, median Eustachian foramen; fot, upper temporal fossa; fra, fractured area; fv, foramen vagi; int, intercentrum; j, jugal; jd, jugal latero-ventral depression; l; lachrymal; lptyp, lateral pterygoidal process (flange); ltf, laterotemporal fenestra; m, maxilla; m1l, first left maxillary tooth; m1r, first right maxillary tooth; m3l, third left maxillary tooth; m3r, third right maxillary tooth; m4l, fourth left maxillary tooth; m5l, fifth left maxillary tooth ; nc, nuchal crest; occ, occipital condyle; or, orbit; oti, otic incisure; oto, otoccipital; p, parietal; pl, palatine; pmt, posterior maxillary teeth; po, postorbital; pop, para-occipital process; pfr, prefrontal; pro, proatlas; pty, pterygoid; q, quadrate; qd, quadrate depression; qdc, quadrate dorsal crest; qj, quadratojugal; rap, retroarticular process; san, surangular; sanr, surangular lateral ridge; sf, siphoneal foramen; soc, supraoccipital; sof, suborbital fenestra; spl, splenial; sq, squamosal; sqp, squamosal posterior process (squamosal prong); utf, upper temporal fenestra; XII, twelfth cranial nerve exit. Scale bar: 100 mm.
Figure 3.
Sahitisuchus fluminensis gen. et sp. nov. (MCT 1730-R), in ventral view.
A, photo; B, illustration. For abbreviations see Figure 1. Scale bar: 100 mm.
Figure 4.
Sahitisuchus fluminensis gen. et sp. nov. (MCT 1730-R), in left lateral view.
A, photo; B, illustration. For abbreviations see Figure 1. Scale bar: 100 mm.
Figure 5.
Sahitisuchus fluminensis gen. et sp. nov. (MCT 1730-R), in occipital view.
A, photo; B, illustration. For abbreviations see Figure 1. Scale bar: 100 mm.
Figure 6.
Fourth mandibular tooth from the left side of Sahitisuchus fluminensis gen. et sp. nov. (MCT 1730-R), showing the serrations.
A, labial surface; B, detail for apex carina; C, detail for middle carina; D, detail for basal carina. Scale bar in A: 10 mm; B, C and D: 1 mm.
Figure 7.
Sahitisuchus fluminensis gen. et sp. nov. (MCT 1730-R) cervical vertebrae.
A, right lateral view of axis and third cervical vertebra; B, anterior view, showing the odontoid process. cvt cv3, centrum of third cervical vertebra; di ax, axis diapophysis; di cv3, diapophysis of third cervical vertebra; lpsop cv3, postspinal lamina of third cervical vertebra; na ax, axis neural arch; na cv3, neural arch of third cervical vertebra; ncs, neuro-central suture; ns ax, axis neural spine; ns cv3, neural spine of third cervical vertebra; od, odontoid process; pa ax, axis parapophysis; pa cv3, parapophysis of third cervical vertebra; poz ax, axis postzygapophysis; poz cv3, postzygapophysis of third cervical vertebra; prz cv3, prezygapophysis of third cervical vertebra. Scale bar: 10 mm.
Table 1.
Measurements in mm of Sahitisuchus fluminensis gen. et sp. nov. (MCT 1730-R), adapted from [25] ∼, estimated measurement.
Table 2.
Sahitisuchus fluminensis gen. et sp. nov. (MCT 1730-R) teeth measurements in mm.
Figure 8.
Biochronology of the Crocodylomorpha based on the strict consensus tree obtained by the phylogenetic analysis (see text for details) and recorded temporal range.