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10 results for “Kiangyousteus”
Figure 10 in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 10. Strict consensus tree of 220 most parsimonious trees using a revised data set of 98 characters and 37 taxa. Numerical values in the right side of the nodes denote Bremer decay indices. Named nodes: A, Eubrachythoraci; C, Coccosteomorphi; F, Incisoscutoidea; H, Camuropiscidae; J, Aspinothoraci; N, Selenosteidae; Q, Dunkleosteoidea; T, Panxiosteidae; U, Dunkleosteidae. Abbreviations: CI, consistency index; CIsct, consistency index of the strict consensus tree; L, length of trees (in evolutionary steps); Lsct, length of the strict consensus tree; n, number of trees; RI, retention index; RIsct, retention index of the strict consensus tree.
Figure 9. A in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 9. A, dorsal view of a generalized eubrachythoracid arthrodire skull roofs showing the measurements (a, b, c, and d) used in the length ratios (r1 and r2). B, scatter plot of b/c and a/c using the formulations of Carr & Hlavin (2010), showing the correlation between the two variables ('r1' and 'r2' respectively in Carr & Hlavin, 2010). C, scatter plot of r1 and r2 using the new formulations; the data were cluster analysed and divided for character coding. Abbreviations: a, pineal foramen–fossa distance; b, anterior sensory line junction–fossa distance; C, central plate; c, posterior sensory line junction–fossa distance; csc, central sensory line groove; d, anterior sensory line junction–pineal foramen distance; ioc.ot, otic branch of infraorbital line groove; ioc.pt, postorbital branch of infraorbital line groove; lc, main lateral line groove; M, marginal plate; Nu, nuchal plate; P, pineal plate; PM, postmarginal plate; pmc, postmarginal line groove; PNu, paranuchal plate; PrO, preorbital plate; PtO, postorbital plate; R, rostral plate; soc, supraorbital sensory line groove.
Figure 8 in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 8. Kiangyousteus yohii. Right anterior ventrolateral plate (IVPP801.5) in A, ventral, and B, dorsal (visceral) views. Right posterior dorsolateral plate (IVPP801.3) in C, lateral, and D, mesial views. Abbreviations: AVL.th, ventral thickening of anterior ventrolateral plate; IL.oa, overlap area for the interolateral plate; MD.oa, overlap area for median dorsal plate; PL.oa, overlap area for posterior lateral plate; s.e, subpectoral emargination; vts, transverse ventral sensory line. Scale bars = 2 cm.
Figure 6 in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 6. Kiangyousteus yohii. Median dorsal plate (IVPP801.4) in A, dorsal, and B, ventral views. C, median dorsal plate in dorsal view with the right part restored by dashed line. Submedian dorsal plate (IVPP801.6) in D, anterior, and E, lateral views. Abbreviations: ADL.cf, contact face for anterior dorsolateral plate; em.arc, embayment for vertebral arch; ff.pca, fractured face of the carinal process of median dorsal keel; f.pca, fossa for the carinal process of median dorsal keel; kv, ventral keel of median dorsal plate; ld, dorsal branch of main lateral line; MD.th, posterior thickening of median dorsal plate; PDL.cf, contact face for posterior dorsolateral plate. Scale bars = 2 cm.
Figure 4 in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 4. Kiangyousteus yohii. Parasphenoid (IVPP801.1) in A, dorsal, and B, ventral views. Abbreviations: a.con, anterior concave region for the articulation with anterior supragnathal; a.th, anterior thickening of parasphenoid; bhy.th, buccohypophysial thickening on the parasphenoid; cr.m, ventral median crest of parasphenoid; f.bhy, buccohypophysial foramen; gr.a.com, transverse ventral groove of parasphenoid; pl.pr, posterolateral process of parasphenoid; sec.th, second thickening posterior to the buccohypophysial thickening. Scale bar = 2 cm.
Figure 3 in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 3. Kiangyousteus yohii. Right anterior supragnathal plate (IVPP801.8) in A, labial, B, lingual, and C, anterior views. Abbreviations: ala, anterior lamina of anterior supragnathal; ch.eth, channel for neurocranial ethmoid region; cusp.th, lateral thickening for anterior supragnathal cusp; dla, dorsal lamina of anterior supragnathal; lla, lateral lamina of anterior supragnathal; lr.cusp, lateral cusp of anterior supragnathal; pr.occ, occlusal shelf posterior to the lateral cusp. Scale bars = 1 cm.
Figure 2 in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 2. Kiangyousteus yohii. Head and trunk shield restored in right lateral view, the preserved parts are shown in white. Abbreviations: AL, anterior lateral plate; ASG, anterior supragnathal; AVL, anterior ventrolateral plate; MD, median dorsal plate; pbl, postbranchial lamina; pca, carinal process of median dorsal keel; PDL, posterior dorsolateral plate; Smd, submedian dorsal plate. Scale bar = 2 cm.
Figure 1 in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 1. Middle Devonian sequence in Longmenshan area (Sichuan, China), showing the stratigraphical position of Kiangyousteus yohii. D1, Early Devonian; D2, Middle Devonian; D3, Late Devonian; Eif., Eifelian; Fm., Formation. Modified after Hou et al. (1988).
Figure 7 in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 7. Kiangyousteus yohii. Right anterior lateral plate (IVPP801.2) in A, lateral, B, visceral, and C, anterior views, detailing the denticulated area of postbranchial lamina. Abbreviations: ADL.cf, contact face for anterior dorsolateral plate; em.pb, postbranchial embayment; lam.dent, denticles on the postbranchial lamina; obst.pr, obstantic process of anterior lateral plate; pbl, postbranchial lamina; PL.cf, contact face for posterior lateral plate. Scale bar = 2 cm.
Figure 5 in A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci
Figure 5. Comparison of eubrachythoracid parasphenoids. Modified after Dennis-Bryan, 1995; Kulczycki, 1956; and Wang, 1979. A, Coccosteus cuspidatus, B, Panxiosteus ocullus, C, Eastmanosteus pustulosus, D, Eastmanosteus calliaspis, E, Kiangyousteus yohi, in ventral views; F, Dunkleosteus terrelli, in dorsal view. Abbreviations: a.con, anterior concave region for the articulation with anterior supragnathal; cr.m, ventral median crest of parasphenoid. Not to scale.
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