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9 results for “Asterolepis”
FIG. 2. — Asterolepis alticristata n in Asterolepis alticristata n. sp. (Antiarchi) from the Upper Devonian (Frasnian) of Nunavut, Canada, and a report on the antiarch diversity of the Fram Formation
FIG. 2. — Asterolepis alticristata n. sp., NUFV 897, holotype, anterior median dorsal plate in visceral (A, photograph; A', labeled illustration), cranial (B), left lateral (C), and dermal (D) views. Abbreviations: cd.PMD, area overlapped by the posterior median dorsal plate; cv.ADL, area overlapping the anterior dorsolateral plate; cv.Mxl, area overlapping the mixilateral plate; lc, lateral corner; op.r oblique posterolateral ridge. Scale bar: 5 cm.
FIG. 8. — Asterolepis alticristata n in Asterolepis alticristata n. sp. (Antiarchi) from the Upper Devonian (Frasnian) of Nunavut, Canada, and a report on the antiarch diversity of the Fram Formation
FIG. 8. — Asterolepis alticristata n. sp. outlines of midline crests of anterior median dorsal plates in left lateral view. Each crest is scaled to a common height and ordered according to actual height in order to highlight the shape variation. Each is depicted with the visceral surface as close to horizontal as possible. A, NUFV 1274; B, NUFV 834; C, NUFV 828; D, NUFV 850; E, NUFV 854; F, NUFV 886; G, NUFV 867; H, NUFV 877; I, NUFV 835; J, NUFV 889; K, NUFV 856; L, NUFV 872; M, NUFV 897 (holotype). Scale bars: 2 cm.
FIG. 4. — Asterolepis alticristata n in Asterolepis alticristata n. sp. (Antiarchi) from the Upper Devonian (Frasnian) of Nunavut, Canada, and a report on the antiarch diversity of the Fram Formation
FIG. 4. — Asterolepis alticristata n. sp., NUFV 898, posterior median dorsal plate in dermal (A), visceral (B), and cranial (C) views. Abbreviations: cv.AMD, area overlapping the anterior median dorsal plate; cv.Mxl, area overlapping the mixilateral plate; v.p, visceral pit. Scale bar: 2 cm.
FIG. 1. — A in Asterolepis alticristata n. sp. (Antiarchi) from the Upper Devonian (Frasnian) of Nunavut, Canada, and a report on the antiarch diversity of the Fram Formation
FIG. 1. — A, Map of Ellesmere Island; B, map of southwestern Ellesmere Island (rectangular inset of A) showing the locations of the field sites that have produced antiarch material; C, stratigraphy of the Okse Bay Group; D, stratigraphy of the Fram Formation type section.
FIG. 3. — Asterolepis alticristata n in Asterolepis alticristata n. sp. (Antiarchi) from the Upper Devonian (Frasnian) of Nunavut, Canada, and a report on the antiarch diversity of the Fram Formation
FIG. 3. — Asterolepis alticristata n. sp.: A-C, NUFV 1265, nuchal plate in dermal (A, photograph; A', labeled illustration), visceral (B, photograph; B', labeled illustration), and caudal (C) views; D-F, NUFV 813, premedian plate in dermal (D), visceral (E), and caudal (F) views; G-I, NUFV 812, premedian plate in dermal (G), visceral (H), and caudal (I) views. Abbreviations: cpl, central pit-line line groove; cv.L, area overlapping the lateral plate; cv.Pn, area overlapping the paranuchal plate; d.end, endolymphatic duct; ifc1, principal section of infraorbital pit-line groove; ml.p, midline process; mo.c, median occipital crista; nm, obtected area; pr.p, prerostral process; ps.f, parasagittal foramina; sop, supraoccipital pit; sot, supraotic thickening. Scale bar: 2 cm.
FIG. 9 in Asterolepis alticristata n. sp. (Antiarchi) from the Upper Devonian (Frasnian) of Nunavut, Canada, and a report on the antiarch diversity of the Fram Formation
FIG. 9. — Antiarchi material from Devonian deposits of Nunavut. A, Asterolepidoidei sp. indet. from NV0207, NUFV 1280, nuchal plate in dermal view; B, Asterolepis sp. indet. from NV0205, NUFV 1287, anterior median dorsal plate in dermal view; C, D, Bothriolepis sp. indet. from NV2K17, NUFV 847, anterior median dorsal plate in dermal (C) and visceral (D) views; E-J, Bothriolepididae sp. indet. from NV2K15, E, F, NUFV 1296, right lateral plate in dermal (E) and visceral (F) views; G, H, NUFV 1295, premedian plate in dermal (G) and visceral (H) views; I, J, NUFV 1302, nuchal plate in dermal (I) and visceral (J) views; K, L, Bothriolepididae sp. indet. from NV2K05, NUFV 1305, articulated partial cephalic skeleton in dermal (K, photograph; K', labeled illustration) and visceral (L, photograph; L', labeled illustration) views; M, N, Bothriolepidoidei sp. indet. from NV9913, NUFV 1308, premedian plate in dermal (M) and visceral (N) views; O-Q, Asterolepidoidei sp. indet. from NV9917, NUFV 1307, nuchal plate in dermal (O), visceral (P), and caudal (Q) views. Abbreviations: cpl, central pit-line groove; ifc1, principal section of infraorbital pit-line groove; L, lateral plate; Nu, nuchal plate; ood, otic-occipital depression; Pm, premedian plate; Pn, paranuchal plate; po.r, preorbital recess; Pp, postpineal plate. Scale bars: 1 cm.
FIG. 6 in Asterolepis alticristata n. sp. (Antiarchi) from the Upper Devonian (Frasnian) of Nunavut, Canada, and a report on the antiarch diversity of the Fram Formation
FIG. 6. — Asterolepis cf. radiata: A, B, NUFV 797, anterior median dorsal plate in dermal (A) and visceral (B, photograph; B', labeled illustration) views; C, D, NUFV 825, partial posterior median dorsal plate in dermal (C) and visceral (D, photograph; D', labeled illustration) views; E, NUFV 863, mixilateral in dermal view. Abbreviations: cd.ADL, area overlapped by the anterior dorsolateral plate; cd.AMD, area overlapped by the anterior median dorsal plate; cd.PMD, area overlapped by the posterior median dorsal plate; cv.ADL, area overlapping the anterior dorsolateral plate; cv.Mxl, area overlapping the mixilateral plate; lc, lateral corner; op.r, oblique posterolateral ridge; ps.d, parasagittal depressions; r.a, rough area; ta, tergal angle; v.p, visceral pit. Scale bar: 2 cm.
FIG. 5. — Asterolepis alticristata n in Asterolepis alticristata n. sp. (Antiarchi) from the Upper Devonian (Frasnian) of Nunavut, Canada, and a report on the antiarch diversity of the Fram Formation
FIG. 5. — Asterolepis alticristata n. sp.: A-C, NUFV 892, left side of articulated partial thoracic skeleton in visceral (A, photograph; A', labeled illustration), left lateral (B, photograph; B', labeled illustration), and cranial (C, photograph; C', labeled illustration) views; D, NUFV 895, right mixilateral plate in dermal view. Abbreviations: ADL, anterior dorsolateral plate; AVL, anterior ventrolateral; c1, central 1 plate; cd, area overlapped by ventral thoracic plates; cd.AMD, area overlapped by the anterior median dorsal plate; cr.d, crescent-shaped depression; cv.Mxl, area overlapping the mixilateral plate; dlr, dorsolateral ridge; f.ax, foramen axillaris; lcg, main lateral line groove; MV, median ventral plate; pr.b, processus brachialis; pr.o, processus obstans. Scale bar: 5 cm.
FIG. 7. — A-M in Asterolepis alticristata n. sp. (Antiarchi) from the Upper Devonian (Frasnian) of Nunavut, Canada, and a report on the antiarch diversity of the Fram Formation
FIG. 7. — A-M, Asterolepidoidei sp. indet. from NV2K17, A, B, NUFV 831, articulated partial cephalic skeleton in dermal (A, photograph; A', labeled illustration) and visceral (B, photograph; B', labeled illustration) views; C, D, NUFV 857, premedian plate in dermal (C) and visceral (D) views; E, F, NUFV 1267, premedian plate in dermal (E) and visceral (F) views; G-I, NUFV 880, nuchal plate in dermal (G), visceral (H), and caudal (I) views; J-L, NUFV 1252, nuchal plate in dermal (J), visceral (K), and caudal (L) views; M, NUFV 808, lateral plate in dermal view; N, cf. Asterolepis sp. indet. from NV2K17, NUFV 852, mixilateral plate in dermal view. Abbreviations: cpl, central pit-line line groove; ifc1, principal section of infraorbital pit-line groove; L, lateral plate; nm, obtected area; Nu, nuchal plate; Pn, paranuchal plate; Pp, postpineal plate. Scale bar: 2 cm.
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