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205 results for “Middle Devonian”
FIGURE 7 in Graphic correlation of the upper Eifelian to lower Frasnian (Middle-Upper Devonian) conodont sequences in the Spanish Central Pyrenees and comparison with composite standards from other areas
FIGURE 7. Correlation of the three sections based on the results of the graphic correlation method.
FIG. 4 in Middle Devonian Calceola sandalina (Linnaeus, 1771) (Anthozoa, Rugosa) from Moravia (Czech Republic): aspects of functional morphology, gerontic growth patterns, and epibionts
FIG. 4. — Calceola with calice facing downstream (A) and upstream (B).
Figure 4 in The postcranial anatomy of two Middle Devonian lungfishes (Osteichthyes, Dipnoi) from Mt. Howitt, Victoria, Australia
Figure 4. Outline of postcranial body and fins: a, Barwickia downunda; b, Howidipterus donnae.
CT and 3D Data from: A large Middle Devonian eubrachythoracid 'placoderm' (Arthrodira) jaw from northern Gondwana
<p><em>Leptodontichthys ziregensis</em> is a newly described eubrachythoracid arthrodire from the Middle Devonian of Morocco. Only the posterior superognathal is preserved, it possesses features which were, so far, seen in Late Devonian forms. The jaw bone presents two sets of teeth, one lateral and one posterior, with dentinous tissue, pulp cavities and vascular canals preserved. The CT scans provided here are the ones used for the study. The complete jaw data was used for the overall study and the closeup data was used for the segmentation of the teeth. The ply data is provided to provide the information extracted by the authors during the study.</p>
The last pteraspids (Agnatha, Heterostraci): New material from the Middle Devonian of Alberta and Idaho
<p>This report documents the last pteraspids, (armored, jawless members of the Heterostraci), which are otherwise only known from the Early Devonian of the Old Red Sandstone Continent. Tuberculate pteraspid heterostracans are described from the Middle Devonian beds of two formations in western North America. The late Givetian Yahatinda Formation of Alberta and British Columbia consists of channels cut into lower Paleozoic rocks and represents deposition in marine to littoral environments. Clavulaspis finis new genus new combination, is redescribed from additional material from the Yahatinda Formation and renamed, as the original genus name has proved to be invalid. The Eifelian Spring Mountain beds of Idaho consist of a large channel that represents a clastic dominated estuarine environment. It contains Scutellaspis wilsoni new genus new species, and the previously described species from the Spring Mountain beds is redescribed as Ecphymaspis idahoensis new genus new combination, prompted by new material and a review of the validity of the original genus name. Phylogenetic analysis shows that these three new taxa form part of the derived clade Protaspididae.</p>
FIGURE 3. Early-middle Famennian bryozoans from Zhankurgan outcrop. SibGIU 12 in Late Devonian-early Carboniferous bryozoans from Zhankurgan (Greater Karatau, Kazakhstan)-taxonomy and palaeobiogeographical implications
FIGURE 3. Early-middle Famennian bryozoans from Zhankurgan outcrop. SibGIU 12/25: A-E Cyphotrypa sp. A, B. transverse section; C, D. longitudinal section showing abundant diaphragms (arrow) and wall microstructure with bulges; E. tangential section. SibGIU 12/26: F, G Anomalotoechus sp. F. tangential section; G. transverse section; SibGIU 12/27: H, I Pseudobatostomella sp. H, I. longitudinal section showing short exilazooecia (arrow).
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).
(Early-Middle Devonian paleomagnetic results from the Zhongba Microterrane, Tibetan Plateau: Evidence for its origin from the northern margin of Greater India
<p>Table S1. An attachment of characteristic remanent magnetization (ChRM) directions of the Nadenger Formation from the Zhongba area.</p>
Early–Middle Devonian paleomagnetic results from the Zhongba Microterrane, Tibetan Plateau: Evidence for its origin from the northern margin of Greater India
<p>raw paleomagnetic data and Palaeozoic detrital zircon data from the Zhongba Microterrane, South Qiangtang Terrane, Tethyan Himalayas and Lhasa Terrane</p>
Data from: The cranial endocast of the Middle Devonian dipnonan Dipterus valenciennesi and a fossilized dipnoan otoconial mass
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Data from: An endemic flora of dispersed spores from the Middle Devonian of Iberia
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The last pteraspids (Agnatha, Heterostraci): New material from the Middle Devonian of Alberta and Idaho
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CT and 3D Data from: A large Middle Devonian eubrachythoracid ‘placoderm’ (Arthrodira) jaw from northern Gondwana
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