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381 results for “Hokkaido”
Fig. 5 in Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan
Fig. 5. Thyasira spp. from Cretaceous cold seep deposits on Hokkaido, Japan. A–G. Thyasira tanabei sp. nov. A. Holotype (UMUT MM 29533) from the Campanian Yasukawa site. B. Paratype (UMUT MM 29534) from the Cenomanian Kanajirisawa site. C. Paratype (UMUT MM 29535) from the Campanian Yasukawa site; lateral view on right valve (C1), oblique view on right valve, showing posterior sulcus (C2), and dorsal view (C3). D. Paratype (UMUT MM 29536) from the Campanian Omagari site. E. Paratype (UMUT MM 29537) from the Campanian Yasukawa site showing the hinge. F. Small specimen (UMUT MM 29538) from the Campanian Yasukawa site. G. Paratype (UMUT MM 29539) from the Albian Ponbetsu site. H. Thyasira sp. (UMUT MM 29540) from the Cenomanian Kanajirisawa site; lateral view on right valve (H1), oblique view on right valve showing posterior sulcus (H2), and dorsal view (H3).
Fig. 4 in Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan
Fig. 4. Acila (Truncacila) from the Campanian Yasukawa seep site on Hokkaido, Japan. A. Acila (Truncacila) hokkaidoensis Nagao, 1932 (UMUT MM 29531), lateral view on left valve (A1) and dorsal view (A2). B. Acila (Truncacila) himenourensis Tashiro, 1985 (UMUT MM 29532), lateral view on right valve (B1), dorsal view showing escutcheon (B2), and dorsal view showing lunule (B3).
Fig. 3 in Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan
Fig. 3. The protobranch bivalve Nucinella gigantea Amano, Jenkins, and Hikida, 2007 from the Cenomanian (Upper Cretaceous) seep carbonate at Kanajirisawa, Obira town, Hokkaido. A. Specimen (UMUT MM 29527) with drill hole and a healed shell injury. B. Articulated specimen (UMUT MM 29528) in dorsal view (B1) and right valve showing radial internal striations (B2). C. Hinge of right valve (UMUT MM 29529). D. Hinge of left valve (UMUT MM 29530).
Fig. 2 in Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan
Fig. 2. Solemyid bivalves from Cretaceous cold seep deposits on Hokkaido, Japan. A, B. Acharax mikasaensis sp. nov., from the Albian Ponbetsu site in Mikasa City. A. Paratype (UMUT MM 29523) showing external sculpture, dorsal (A1) and lateral (A2) views. B. Holotype (UMUT MM 29524) showing features of the shell interior; arrow in B1 indicates posterior adductor muscle scar, B2 shows a dorsal view, white arrow in B3 indicates the anterior adductor muscle scar, black arrow indicates the narrow band that ascends from its posteroventral margin. C–E. Acharax cretacea Kanie and Nishida, 2000, from the Campanian Yasukawa site. C. Right valve of a slightly deformed, medium−sized specimen (UMUT MM 29525), length 34 mm. D. Small specimen (UMUT MM 29526) (length 8 mm) showing the rounded posterior shell margin, dorsal (D1) and lateral (D2) views. E. Cross section of shell showing the prismatic microstructure.
Fig. 1. Maps showing the fossiliferous seep deposits. A. The Albian Ponbetsu site. B. The Campanian Yasukawa and Omagari sites. C. The Cenomanian Kanajirisawa site. D in Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan
Fig. 1. Maps showing the fossiliferous seep deposits. A. The Albian Ponbetsu site. B. The Campanian Yasukawa and Omagari sites. C. The Cenomanian Kanajirisawa site. D. Overview.
Fig. 3. Eight landmarks and 89 in Late Cretaceous record of large soft-bodied coleoids based on lower jaw remains from Hokkaido, Japan
Fig. 3. Eight landmarks and 89 semi-landmarks collected on a coleoid lower jaw (A, B). 1, the rostral tip; 2, the base of the rostrum; 3, the posterior end of the wing; 4, the posterior intersection of the outer and inner lamellae; 5, the posterior end of the inner lamella; 6, the anteroventral end of the crest; 7, the anterior intersection of the outer and inner lamellae; 8, the anteroventral end of the hood. B. A square grid showing shape differences between two individuals as deformation from B to B drawn by use of a thin-plate spline.
Fig. 6 in Late Cretaceous record of large soft-bodied coleoids based on lower jaw remains from Hokkaido, Japan
Fig. 6. Octobrachian coleoid Nanaimoteuthis hikidai sp. nov. KMNH IvP 902,001, holotype, a lower jaw; early Campanian, Late Cretaceous, Haboro area, Hokkaido, Japan. Right lateral (A), left lateral (C), dorsal (D), and frontal (E) views, and right lateral view after removing part of outer lamella (B).
Fig. 2 in Late Cretaceous record of large soft-bodied coleoids based on lower jaw remains from Hokkaido, Japan
Fig. 2. Diagrammatic drawing of a coleoid lower jaw. Left lateral (A) and frontal (B) views. 1, rostral length; 2, hood length; 3, crest length; 4, wing length; 5, width of outer lamella. After Clarke (1962, 1986), see Clarke and Maddock (1988) for terms and measurements.
Fig. 1 in Late Cretaceous record of large soft-bodied coleoids based on lower jaw remains from Hokkaido, Japan
Fig. 1. Map of Haboro area, northwest Hokkaido, Japan, showing the locations of the coleoid lower jaws examined.
Fig. 8 in Late Cretaceous record of large soft-bodied coleoids based on lower jaw remains from Hokkaido, Japan
Fig. 8. Phylogenetic relationships of fossil and modern coleoid major taxa complied from the data by Kröger et al. (2011: fig. 5) and Fuchs et al. (2013: fig. 12). Fossil records of Cretaceous decabrachian and octobrachian coleoids from the North Pacific region are given in black circles. 1, Haboroteuthis (this study); 2, Yezoteuthis (Tanabe et al. 2006); 3, Paleocirroteuthis (Tanabe et al. 2008); 4, Nanaimoteuthis (Tanabe et al. 2008; Tanabe and Hikida 2010; this study). Age after Cohen et al. (2012).
Fig. 7 in Late Cretaceous record of large soft-bodied coleoids based on lower jaw remains from Hokkaido, Japan
Fig. 7. Decabrachian coleoid Haboroteuthis poseidon gen. et sp. nov. KMNH IvP 902,002, holotype, a lower jaw; late Santonian, Late Cretaceous, Haboro area, Hokkaido, Japan. Frontal (A), left lateral (B), dorsal (C), and right lateral (D) views.
Fig. 5 in Late Cretaceous record of large soft-bodied coleoids based on lower jaw remains from Hokkaido, Japan
Fig. 5. Plots of the relative warp scores computed for the full set (A, B) or subset (C, D) of landmarks and semi-landmarks and the relative warps displayed as thin-plate splines. The lower and left grids show deformations from the mean shape (undeformed grid) corresponding to perturbations associated with RW1 and RW2, respectively (A, C) or RW3 and RW4, respectively (B, D).
Fig. 4 in Late Cretaceous record of large soft-bodied coleoids based on lower jaw remains from Hokkaido, Japan
Fig. 4. All coleoid lower jaws registered by the generalized least squares superimposition. A. A full set of landmarks (large symbols) and semi-landmarks (small symbols). B. A subset of landmarks and semi-landmarks put along the outline of the outer lamella.
Fig. 5 in A monospecific assemblage of terebratulide brachiopods in the Upper Cretaceous seep deposits of Omagari, Hokkaido, Japan
Fig. 5. Terebratulide brachiopod Eucalathis methanophila Bitner sp. nov., Campanian, Omagari, Japan. A. UMUT MB30197, transverse section of ventral valve, visible fused fibres (A1), visible boundary of primary and secondary layers (A2). B. UMUT MB30203, ventral valve, transverse sections of the whole shell (B1), visible boundary between primary and secondary layers, and punctae (B2). All SEM.
Fig. 4 in A monospecific assemblage of terebratulide brachiopods in the Upper Cretaceous seep deposits of Omagari, Hokkaido, Japan
Fig. 4. Recontruction of internal structures of Eucalathis methanophila Bitner sp. nov. based on transverse serial sections (Fig. 3) and 3D digital reconstruction (see at http://app.pan.pl/SOM/app55-Kaim_etal_SOM.pdf). Drawing by Ewa Widłak−Kaim.
Fig. 3 in A monospecific assemblage of terebratulide brachiopods in the Upper Cretaceous seep deposits of Omagari, Hokkaido, Japan
Fig. 3. Transverse serial sections of terebratulide brachiopod Eucalathis methanophila Bitner sp. nov. through specimen UMUT MB30203, Campanian, Japan. Original dimensions of the specimens: L = 4.9 mm, W = 4.4. mm, T = 2.0 mm. Numbers indicate distance in mm from the tip of the ventral umbo.
Fig. 1 in A monospecific assemblage of terebratulide brachiopods in the Upper Cretaceous seep deposits of Omagari, Hokkaido, Japan
Fig. 1. Geological map of the Nakagawa area, Hokkaido, showing the location of the Omagari site. Modified from Takahashi et al. (2003).
FIGURE 5. The skull, NFL 2074 in A new skull of the fossil porpoise Numataphocoena yamashitai (Cetacea: Phocoenidae) from the upper part of the Horokaoshirarika Formation (lower Pliocene), Numata Town, Hokkaido, Japan, and its phylogenetic position
FIGURE 5. The skull, NFL 2074, referred specimen of Numataphocoena yamashitai in anterior view. 1, photo, 2, line art.
FIGURE 4. The skull, NFL 2074 in A new skull of the fossil porpoise Numataphocoena yamashitai (Cetacea: Phocoenidae) from the upper part of the Horokaoshirarika Formation (lower Pliocene), Numata Town, Hokkaido, Japan, and its phylogenetic position
FIGURE 4. The skull, NFL 2074, referred specimen of Numataphocoena yamashitai in lateral view. 1, photo, 2, line art.
FIGURE 6 in A new skull of the fossil porpoise Numataphocoena yamashitai (Cetacea: Phocoenidae) from the upper part of the Horokaoshirarika Formation (lower Pliocene), Numata Town, Hokkaido, Japan, and its phylogenetic position
FIGURE 6. Life restoration of Numataphocoena yamashitai. Art work by Tatsuya Shinmura (Ashoro Museum of Paleontology).
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OpenNeuro
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