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9 results for “Acanthothoraci”
FIG. 8. — Arabosteus variabilis n. gen., n in A new Placoderm fish (Acanthothoraci) from the Early Devonian Jauf Formation (Saudi Arabia)
FIG. 8. — Arabosteus variabilis n. gen., n. sp. skull roof ornamentation (MNHN.F.1992-6-136): A, silicone cast of the skull roof impression in matrix; B, zoom showing oval and elongate tubercles. The black frame shows the enlarged area. Arrows indicate anterior. Labels in italics indicate the sensory line system. Abbreviations: d.end, endolymphatic duct opening; mpl, middle pit line; ppl.a, posterior pit line anterior part; ppl.p, posterior pit line posterior part; soc, supraorbital sensory line groove. Scale bars: A, 1 cm; B, 0.5 cm.
FIG. 7 in A new Placoderm fish (Acanthothoraci) from the Early Devonian Jauf Formation (Saudi Arabia)
FIG. 7. — Left orbit of Arabosteus variabilis n. gen., n. sp. (MNHN.F.1992-6-139): A, lateral view; B, interpretation. Arrows indicate anterior. Abbreviations: II, groove for the optic nerve; III, oculomotor nerve foramen; III p, foramen for oculomotor nerve posterior branch; IV, trochlear nerve foramen; V1, foramen for trigeminal nerve profundus branch; a.c.v, anterior cerebral vein; c.v.pit, pituitary vein canal; eys, eyestalk attachment area; my3, myodome for oculomotorius-innervated eye muscle (superior rectus?). Scale bars: 0.5 cm.
FIG. 6. — Arabosteus variabilis n. gen., n in A new Placoderm fish (Acanthothoraci) from the Early Devonian Jauf Formation (Saudi Arabia)
FIG. 6. — Arabosteus variabilis n. gen., n. sp. occipital area of the holotype (MNHN.F.1992-6-132): A, occipital view; B, interpretation. Abbreviations: c.c, canal of endocranial extension of notochord; c.e, cranial cavity (foramen magnum); d.art, dermal articular area; m.o.fo, muscular occipital fossa; pr.gl, glenoid process. Scale bars: 1 cm.
FIG. 9 in A new Placoderm fish (Acanthothoraci) from the Early Devonian Jauf Formation (Saudi Arabia)
FIG. 9. — Reconstructions of the skull roof of: A, the arthrodire Simblaspis cachensis Denison, 1958 (modified after Denison 1958); B, the petalichthyid Lunaspis broilii Gross, 1937 (modified after Goujet 1972); C, the acanthothoracid Romundina stellina Orvig, 1975 (modified after Goujet & Young 2004). Arrows indicate anterior. Labels in italics indicate the sensory line system; regular labels indicate the skull bones. Abbreviations: Al, anterior lateral plate; cc, central sensory line groove; Ce, central plate; cu.so, cutaneous sensory organ; d.end, endolymphatic duct opening; ifc, infraorbital sensory line groove; lc, main lateral sensory line groove; Mg, marginal plate; mpl, middle pit line; Nu, nuchal plate; occ, occipital cross commissure; Pan.a, anterior paranuchal plate; Pan.m, medial paranuchal plate; Pan.p, posterior paranuchal plate; pfc, profundus sensory line groove; Pi, pineal plate; pmc, postmarginal sensory line groove; Pmg, postmarginal plate; Pn, paranuchal plate; ppl.a, posterior pit line anterior part; ppl.p, posterior pit line posterior part; Prm, premedian plate; Pro, preorbital plate; Ptn, postnasal plate; Pto, postorbital plate; Ro, rostral plate; Rp, rostropineal plate; Sm, submarginal plate; soc, supraorbital sensory line groove. Scale bars: A, 1 cm; B, 2 cm; C, 0.5 cm.
FIG. 4 in A new Placoderm fish (Acanthothoraci) from the Early Devonian Jauf Formation (Saudi Arabia)
FIG. 4. — Incomplete skull roofs of Arabosteus variabilis n. gen., n. sp. in dorsal views: A, MNHN.F.1992-6-138; B, MNHN.F.1992-6-137; C, MNHN.F.1992-6-139. Arrows indicate anterior. Labels in italics indicate the sensory line system; regular labels indicate the skull bones. Abbreviations: Ce, central plate; d.end, endolymphatic duct opening; lc, main lateral sensory line groove; Nu, nuchal plate; pmc, postmarginal sensory line canal; Pan.a, anterior paranuchal plate; Pan.m, medial paranuchal plate; Pan.p, posterior paranuchal plate; ppl.p, posterior pit line posterior part; Pro, preorbital plate; soc, supraorbital sensory line groove. Scale bars: 1 cm.
FIG. 3 in A new Placoderm fish (Acanthothoraci) from the Early Devonian Jauf Formation (Saudi Arabia)
FIG. 3. — Incomplete skull roofs of Arabosteus variabilis n. gen., n. sp. in dorsal views: A, B, MNHN.F.1992-6-132, holotype and skull roof reconstruction; C, D, MNHN.F.1992-6-133, original specimen and outline drawing of the bone suture pattern. Arrows indicate anterior. The grey area indicates the missing external bone. Labels in italics indicate the sensory line system; regular labels indicate the skull bones. Abbreviations: Ce, central plate; d.end, endolymphatic duct opening; lc, main lateral sensory line groove; Mg, marginal plate, m.o.fo, muscular occipital fossa; mpl, middle pit line; Nu, nuchal plate; Pan.a, anterior paranuchal plate; Pan.m, medial paranuchal plate; Pan.p, posterior paranuchal plate; pmc, postmarginal sensory line canal; ppl.a, posterior pit line anterior part; ppl.p, posterior pit line posterior part; Pro, preorbital plate; Pto, postorbital plate; soc, supraorbital sensory line groove. Scale bars: 1 cm.
FIG. 2 in A new Placoderm fish (Acanthothoraci) from the Early Devonian Jauf Formation (Saudi Arabia)
FIG. 2. — Incomplete skull roofs of Arabosteus variabilis n. gen., n. sp. in dorsal views: A, B, MNHN.F.1992-6-134, original specimen and skull roof reconstruction; C, D, MNHN.F.1992-6-135, original specimen and outline drawing of the bone suture pattern. Arrows indicate anterior. Labels in italics indicate the sensory line system; regular labels indicate the skull bones. Abbreviations: Ce, central plate; d.end, endolymphatic duct opening; lc, main lateral sensory line groove; Mg, marginal plate; mpl, middle pit line; Nu, nuchal plate; Pan.a, anterior paranuchal plate; Pan.m, medial paranuchal plate; Pan.p, posterior paranuchal plate; pmc, postmarginal sensory line canal; ppl.a, posterior pit line anterior part; ppl.p, posterior pit line posterior part; Pro, preorbital plate; PtC, posterior central plate; Pto, postorbital plate; soc, supraorbital sensory line groove. Scale bars: 1 cm.
FIG. 1 in A new Placoderm fish (Acanthothoraci) from the Early Devonian Jauf Formation (Saudi Arabia)
FIG. 1. — Geographical and geological settings the Qasr Limestone Member: A, Al Qalibah quadrangle; B, Al Huj section through the Jauf Formation; fish symbol represents the stratigraphical horizon where the material has been found (modified after Lelièvre et al. 1999).
FIG. 5 in A new Placoderm fish (Acanthothoraci) from the Early Devonian Jauf Formation (Saudi Arabia)
FIG. 5. — Endocranium of Arabosteus variabilis n. gen., n. sp. as preserved in the holotype (MNHN.F.1992-6-132): A, ventral view; B, reconstruction. Arrows indicate anterior. Abbreviations: IV, trochlear nerve foramen; V, trigeminal nerve foramen; V1, foramen for trigeminal nerve profundus branch; V+VII, trigemino-facial duct; VI, abducens nerve canal and foramen; VII hm, foramen for hyomandibular branch of facial nerve; VIII, acoustic nerve canal; IX, glossopharyngeus nerve tract; X, vagus nerve canal; X1, foramen of the vagus nerve anterior branch; c.e, cranial cavity; c.v.ju, jugular vein canal; c.v.pit, pituitary vein canal; d.art, dermal articular area; fo.hy, hyoidean fossa; fo.pbr, peribranchial fossa; my6, myodome for abducens-innervated eye muscle; orb, orbit; pr.apo, anterior postorbital process; pr.gl, glenoid process; pr.ppo, posterior postorbital process; pr.sv, supravagal process; ru, utricular recess; sac, sacculus; v.hm, hyoid veins foramina. Scale bars: 1 cm.
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