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Fig. 4 | BMC Evolutionary Biology

Fig. 4

From: Internal cranial anatomy of Early Triassic species of †Saurichthys (Actinopterygii: †Saurichthyiformes): implications for the phylogenetic placement of †saurichthyiforms

Fig. 4

Interpretative drawing of braincase and parasphenoid anatomy of †Saurichthys sp. (NHMD_157546_A); a left lateral view; b dorsal view; c ventral view; d dorsal view of parasphenoid; gray shade indicates elements of dermal origin. Dashed gray line indicates cryptic oticooccipital fissure. Abbreviations: I, olfactory nerve; II, optic nerve; III, oculomotor nerve; IV, trochlear nerve; V, trigeminal nerve; Vmx, maxillary ramus of trigeminal nerve; Vopts, superficial ophthalmic ramus of trigeminal nerve; IX, glossopharyngeal nerve; X, vagus nerve; acv, anterior cerebral vein; aon, aortic notch; apal, palatine artery; aps, pseudobranchial artery; asc, anterior semicircular canal; asp, ascending process of parasphenoid; auf, autopalatine fossa; bhf, buccohypophyseal opening; ccar, common carotid artery; crsf, craniospinal fossa; crsp, craniospinal process; damy, dorsal anterior myodome; dlf, likely origin of dilatator and/or hyomandibular protractor muscles; epo?, epiotic-like ossification; fb, fossa bridgei; hmf, hyomandibular facet; hpc, hypophyseal chamber; iof, interorbital fenestra; ios, interorbital septum; jc, jugular canal; mcv, mid-cerebral vein; nao, narial opening; nocc, spinooccipital nerve; nocc/aocc, spinooccipital nerve or occipital artery; occ, occipital crest; otp, otic process; pmy, posterior myodome; porp, postorbital process; pspk, parasphenoid keel; soc, trace of supraorbital canal; spig, spiracular groove; tsf, tectosynotic fossa; vamy, ventral anterior myodome; vo, vomer. Scale bar equals 1 cm

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