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381 results for “Hokkaido”
Fig. 1 in Pseudoleucochloridium ainohelicis nom. nov. (Trematoda: Panopistidae), a Replacement for Glaphyrostomum soricis Found from Long-Clawed Shrews in Hokkaido, Japan, with New Data on its Intermediate Hosts
Fig. 1. Frequencies of cox1 haplotypes and their statistical parsimony network in Pseudoleucochloridium ainohelicis nom. nov. All of the twelve isolates were collected in Asahikawa. The size of circles indicates the frequency of the haplotypes. Small circles show hypothetical haplotypes. The shaded circle represents the hypothetical ancestor.
Fig. 5 in Pseudoleucochloridium ainohelicis nom. nov. (Trematoda: Panopistidae), a Replacement for Glaphyrostomum soricis Found from Long-Clawed Shrews in Hokkaido, Japan, with New Data on its Intermediate Hosts
Fig. 5. The adult of Pseudoleucochloridium ainohelicis nom. nov. from Sorex unguiculatus. The drawing is in ventral view. The large suckers, M-shaped configuration of uterus, and terminally-positioned genital pore are characteristic of the genus. Scale bar 500 µm.
Fig. 8 in Marine Macrodasyida (Gastrotricha) from Hokkaido, Northern Japan
Fig. 8. Differential interference contrast photomicrographs of Turbanella lobata sp. nov., holotype (ICHUM 4982). A, Head and neck region; arrowhead indicates lateral lobe on the neck; B, mid-body region, showing oocytes and testes; C, caudal part, showing the arrangement of the posterior adhesive tubes (TbP).
Fig. 6 in Marine Macrodasyida (Gastrotricha) from Hokkaido, Northern Japan
Fig. 6. Turbanella cuspidata sp. nov. A, SEM image of head and neck region; arrowhead indicates projective organ, left anteroventral view, paratype ICHUM 4991. B–D, Differential interference contrast photomicrographs of holotype (ICHUM 4980); B, head and neck region, ventral view; C, mid-body region showing oocytes; D, caudal part, ventral view, showing medial caudal cone and arrangement of posterior adhesive tubes (TbP). Abbreviation: TbA, anterior adhesive tube.
Fig. 4 in Marine Macrodasyida (Gastrotricha) from Hokkaido, Northern Japan
Fig. 4. Maximum-likelihood tree (lnL=−37094.311007) showing phylogenetic relationships among Cephalodasys mahoae sp. nov. and 28 other macrodasyidans, inferred from concatenated 18S, 28S, and COI sequences. Xenotrichula intermedia and X. velox (Chaetonotida: Xenotrichulidae) represent the outgroup. The scale indicates branch length in number of substitutions per site. Numbers at nodes are bootstrap value and Bayesian posterior probability. Planodasyidae, Redudasyidae, Thaumastodermatidae, and Turbanellidae were recovered monophyletic, while Cephalodasyidae (shaded) was non-monophyletic.
Fig. 2 in Marine Macrodasyida (Gastrotricha) from Hokkaido, Northern Japan
Fig. 2. Cephalodasys mahoae sp. nov., line drawings of holotype (ICHUM 4977). A, Dorsal view showing the digestive and reproductive tracts, glands, adhesive tube, and tactile body ciliation; B, ventral view showing the adhesive tubes and locomotory ciliation. Abbreviations: TbA, anterior adhesive tube; TbP, posterior adhesive tube; TbVL, ventro-lateral adhesive tube.
Fig. 1 in Marine Macrodasyida (Gastrotricha) from Hokkaido, Northern Japan
Fig. 1. Map of Hokkaido, showing three sampling localities in this study: Ishikari, Mukawa, and Higashi-Shizunai.
Fig. 3 in Marine Macrodasyida (Gastrotricha) from Hokkaido, Northern Japan
Fig. 3. Differential interference contrast photomicrographs of Cephalodasys mahoae sp. nov. A, Subadult specimen from Ishikari beach, paratype ICHUM 497; B, subadult specimen from Mukawa (lost after being photographed), showing refractive granules at anterior and posterior ends of anterior intestine (indicated by arrowheads); C, anterior adhesive tube (TbA), subadult specimen from Ishikari beach, lost after observation; D, posterior region of body, showing three oocytes (arrowheads) developing from posterior to anterior; holotype (ICHUM 4977). Abbreviations: PhJIn, junction between pharynx and intestine; TbVL, ventro-lateral adhesive tube; TbP, posteior adhesive tube.
Fig. 1 in Limnotrachelobdella okae (Hirudinida: Piscicolidae) Parasitic on Big-scaled Redfin, Pseudaspius hakonensis (Cypriniformes: Leuciscidae), in Two Brackish Water Lakes, Hokkaido, Japan
Fig. 1. Limnotrachelobdella okae parasitic on big-scaled redfin, Pseudaspius hakonensis, from Lake Tofutsu, Hokkaido, Japan. A, leech (open triangle) and scar (closed triangle) on body surface; B, leech attached to pelvic fin. Note hemorrhage at and around site of caudal sucker attachment. Scale bars: A, 50 mm; B, 10 mm.
Fig. 3. Limnotrachelobdella okae, 61.0 in Limnotrachelobdella okae (Hirudinida: Piscicolidae) Parasitic on Big-scaled Redfin, Pseudaspius hakonensis (Cypriniformes: Leuciscidae), in Two Brackish Water Lakes, Hokkaido, Japan
Fig. 3. Limnotrachelobdella okae, 61.0 mm total length in 70% ethanol. NSMT-An 1879, from big-scaled redfin, Pseudaspius hakonensis, from Lake Tofutsu, Hokkaido, Japan. A, entire body, ventral view; B and C, trachelosome including oral sucker and clitellum, ventral and dorsal views, respectively; D and E, caudal sucker and posterior portion of urosome, ventral and dorsolateral views, respectively; F, Urosome segments including 5th–7th pairs of pulsatile vesicles. Abbreviations: c, clitellum; cs, caudal sucker; eb, everted bursa; mg, male gonopore; os, oral sucker; t, trachelosome; u, urosome; 5pv, 5th pulsatile vesicle; 6pv, 6th pulsatile vesicle; 7pv, 7th pulsatile vesicle. Each position of pulsatile vesicles 1–13 is indicated by an Arabic numeral. Horizontal lines indicate boundaries of urosome segments. Scale bars: A, 10 mm; B, C, 5 mm; D, E, 3 mm; F, 5 mm.
Fig. 2. Limnotrachelobdella okae, 61.2 in Limnotrachelobdella okae (Hirudinida: Piscicolidae) Parasitic on Big-scaled Redfin, Pseudaspius hakonensis (Cypriniformes: Leuciscidae), in Two Brackish Water Lakes, Hokkaido, Japan
Fig. 2. Limnotrachelobdella okae, 61.2 mm total length in 70% ethanol. NSMT-An 1880, from big-scaled redfin, Pseudaspius hakonensis, from Lake Abashiri, Hokkaido, Japan. A, fresh specimen, dorsal view; B and C, ethanol-preserved specimen, dorsal and ventral views, respectively. Abbreviations: cs, caudal sucker; os, oral sucker; t, trachelosome; u, urosome. Each position of pulsatile vesicles 1–13 is indicated by an Arabic numeral. Scale bars: A–C, 10 mm.
Fig. 8 in Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan
Fig. 8. Two categories of the preservation pattern of the body chamber of tetragonitid ammonoid Tetragonites minimus Shigeta, 1989, from the Santonian, Yezo Group in the Haboro, Kotanbetsu, and Tappu areas, Hokkaido, Japan. A. MCM-W1549, complete or almost intact specimen, note the interiors of the body chamber filled with sparry calcite. B. MCM-W1555, incomplete specimen. In lateral (A1, B1) and median section (A2, B2) views. Arrowheads indicate the last septum. Scale bars 5 mm.
Fig. 7 in Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan
Fig. 7. Scatter diagrams of four parameters versus shell diameter (D) of tetragonitid ammonoid Tetragonites minimus Shigeta, 1989, from the Santonian, Yezo Group in Hokkaido, Japan. A. H1/D (whorl height ratio). B. H2/D (ventral whorl height ratio). C. U/D (umbilical width ratio). D. B/D (whorl breadth ratio). Abbreviations: H1, whorl height; H2, ventral whorl height; U, umbilical width; B, whorl breadth.
Fig. 6 in Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan
Fig. 6. The size distribution in a single horizon: outcrop HR109 (Santonian) in the Horotatesawa Creek of the Kotanbetsu area, Hokkaido, Japan.
Fig. 5 in Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan
Fig. 5. Characteristics of ratio of numbers and size of dimorphism in tetragonitid ammonoid Tetragonites minimus Shigeta, 1989, from the Yezo Group in Hokkaido, Japan. The specimens treated here were collected from various stratigraphic levels in the Santonian in the Kotanbetsu, Tappu, and Haboro areas. A. The ratio of numbers of dimorphic pairs. B. Compilation of the size distribution in phragmocone diameter (PD). C. Comparative representation of the size of dimorphic pairs with indication of the phragmocone and body chamber.
Fig. 4 in Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan
Fig. 4. Mature modifications recognised in tetragonitid ammonoid Tetragonites minimus Shigeta, 1989, from the Yezo Group in the Haboro, Kotanbetsu, Tappu, Nakagawa, Soya, and Yubari areas, Hokkaido, Japan. A, B. Changes in the shape of the body chamber: modification appeared at venter (A, MCM-W1591) and umbilicus (B, MCM-W1556). C. Shell thickening in the aperture, MCM-W1560. D. Septal crowding and increase in septal thickness, MCM-W1565; arrowhead indicates the last septum. Scale bars 2 mm.
Fig. 3 in Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan
Fig. 3. Measurements of the conch geometries of tetragonitid ammonoid Tetragonites minimus Shigeta, 1989, from the Yezo Group in Hokkaido, Japan. A. Measured parameters on the specimens polished along the median plane. B. Measured ontogenetic changes of parameters on the specimens polished along the median plane, followed by the perpendicular plane. Abbreviations: B, whorl breadth; D, shell diameter; H1, whorl height; H2, ventral whorl height; PD, phragmocone diameter; U, umbilical width.
Fig. 1. A in Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan
Fig. 1. A. Location map around studied areas in Hokkaido, Japan (inset shoving location of Yezo Group deposits). B. Generalized columnar section of the Santonian, Yezo Group in the Kotanbetsu area showing stratigraphic occurrence of dimorphic pairs of Tetragonites minimus Shigeta, 1989, and the selected stage-diagnostic mega-fossils. Double head arrows indicate the areas where the columnar sections were constructed. See Aiba (2019) for details of stratigraphy. Abbreviations: C., Creek; R., River.
Fig. 2 in Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan
Fig. 2. Photographs of microconch and macroconch in lateral view of tetragonitid ammonoid Tetragonites minimus Shigeta, 1989, from the Santonian, Yezo Group, Horotatesawa Creek (A, outcrop HR001, and B, HR109) the Kotanbetsu area, Hokkaido, Japan. A. MCM-W1560 [m]. B. MCM-W1572 [M].
Fig. 5 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan
Fig. 5. Temporal changes in faunal components of ammonoid species richness in the Mikasa area. Abbreviations: CIUs, carbon isotopic units; e., early; m., middle.
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Allen Brain Atlas
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