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1,093 results for “Gastropods”
Fig. 15. A in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 15. A juvenile specimen (UMUT MM30196) of Gigantocapulus sp., a mollusk of uncertain taxonomic affinity in lateral (A, B), apical (C), and posterior (D) views. E. Cross section through the shell displaying three layers: an outer, possibly fibrous prismatic (fp), a middle cross foliate (cf), and an inner layer of uncertain microstructure. F. Another section showing the same layers. G. Close up of the foliated structure, uppermost part of the layer consist of polygonal plates resembling broken semifoliated structure or detached tablets of nacreous structure.
Fig. 11 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 11. The hokkaidoconchid gastropod Hokkaidoconcha hikidai Kaim, Jenkins, and Warén, 2008 from the Campanian (Upper Cretaceous) Yasukawa seep site in Hokkaido, Japan. A. Holotype (UMUT MM29391) in lateral view. B. UMUT MM30183 in lateral (B1), apertural (B2), and apical (B4) views; B3, cross section through the shell displaying inner and outer prismatic (p) layers and middle cross−lamellar (cl) layer. C. UMUT MM30184 in apertural view (C1) and details of ornamentation (C2).
Fig. 10 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 10. The provannid gastropod Provanna nakagawensis sp. nov. from the Campanian (Upper Cretaceous) Omagari (A–D) and Yasukawa (E–G) seep sites in Hokkaido, Japan. A. Holotype (UMUT MM30178) in apertural (A1), lateral (A2), and apical (A3) views. B. UMUT MM30179 in apertural (B1), lateral (B2), and (B3) views. C. UMUT MM29362 in apertural view. D. UMUT MM30180 in lateral (D1, D2) and apical (D3) views. E. UMUT MM30181 in apertural view. F. UMUTMM30182in lateral (F1) and apical (F2) views. G. UMUT MM19363 in lateral (G1) and apical (G2) views.
Fig. 5 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 5. The turbinid gastropod Cantrainea yasukawensis sp. nov. from the Campanian (Upper Cretaceous) Yasukawa seep site in Hokkaido, Japan. A. UMUT MM30153 in lateral view. B. UMUT MM30154 in lateral view (B1) and another view (B2) showing inclination of the aperture. C. UMUT MM30155 in lateral view (C1) and another view (C2) showing inclination of the aperture. D. UMUT MM30156 in lateral view (D2) and another view (D1) showing inclination of the aperture. E. UMUT MM30157 in lateral view. F. Holotype (UMUT MM30158) in apertural (F1) and lateral (F2) views. G. UMUT MM30159 in lateral view. H. UMUT MM30160 in lateral view. I. UMUT MM30161 in lateral view (I1) and details of ornamentation (I2). J. UMUT MM30162, aggregation of three specimens and an operculum; J1, general view; J2, the operculum. K. UMUT MM30163 in lateral view (K1), shell microstructure (K2) including the inner nacreous (n) and fibrous prismatic (fp) layers, and details of shell ornamentation (K3).
Fig. 3 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 3. The acmaeid gastropod Serradonta omagariensis sp. nov. from the Campanian (Upper Cretaceous) Omagari (A, B, D) and Yasukawa (C) seep sites in Hokkaido, Japan. A. Holotype (UMUT MM29351) in apical (A1), lateral (A2), and anterior (A3) views. B. UMUT MM30145 in apical (B1), lateral (B2), and anterior views. C. UMUT MM30146 in apical (C1), lateral (C2), and posterior (C3) views. D. UMUT MM30147 in apical (D1) and lateral (D2) views; D3, illustrates layering of the shell while D4 is a cross section through shell showing two layers obliterated by diagenesis. Abbreviations: p, prismatic; cl, cross lamellar.
Fig. 4 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 4. The turbinid gastropod Homalopoma abeshinaiensis sp. nov. from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30148 in lateral (A1), latero−apical (A2), and apical (A3) views; A4, juvenile whorl; A5, details of shell ornamentation. B. UMUT MM30149 in apertural (B1), lateral (B2), and umbilical (B3) views. C. Holotype (UMUT MM30150) in lateral (C1, C2) and apical (C3) views. D. UMUT MM30151 in lateral view. E. UMUT MM30152 in apertural (E1), lateral (E2), and umbilical (E3) views.
Fig. 7 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 7. Turbinid gastropods of the genus Cantrainea from chemosynthesis−based communities. A–F. Cantrainea omagariensis sp. nov. from Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30165 in apical (A1), umbilical (A2), lateral (A3), and apertural views (A4). B. Holotype (UMUT MM30166) in apical (B1, B5), lateral (B2, B3), and latero−apical (B4) views. C. UMUT MM30167 in lateral (C1) and apical (C2) views. D. UMUT MM30168; details of inner lip (D1), apertural (D2) and umbilical (D3) views. E. UMUT MM30169 in lateral view. F. UMUT MM30170 in apical view. G. Recent Cantrainea nuda Okutani, 2001 from "depression B" of the Minami Ensei Knoll, Okinawa Trough, Japan (NSMT−Mo 73040) in lateral (G1), apical (G2), and umbilical (G3) views; G4, details of inner lip.
Fig. 14 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 14. Skeneimorph gastropod from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30193 in apertural (A1), lateral (A2), and apical (A3) views. B. UMUT MM30194 in lateral (B1), apertural (B2), and umbilical (B3) views. C. UMUT MM30195 in apical view (C1) and close up of initial whorls (C2).
Fig. 6 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 6. The turbinid gastropod Cantrainea yasukawensis sp. nov. from the Campanian (Upper Cretaceous) Yasukawa seep site in Hokkaido, Japan. A. UMUT MM30164 in lateral (A1), apertural (A2), and umbilical (A3) view; A4, details of inner lip. B. UMUT MM30154 in apical view. C. UMUT MM30156 in apical view. D. UMUT MM30159 in apical view. E. UMUT MM30157 in apical view. F. UMUT MM30155 in latero−apical view. G. UMUT MM30160 in apical view. H. Holotype (UMUT MM30158) in umbilical view. I. UMUT MM30153 in umbilical view.
Fig. 16 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 16. List of gastropod genera and their stratigraphical ranges in Cretaceous chemosynthesis−based associations. The genera in bold occur in the Campanian (Late Cretaceous) hydrocarbon seep sites in Nakagawa area. Note discrepancy in the composition of Lower and Upper Cretaceous gastropod associations. *Similar to Amberleya is Bathybembix that is known from chemosynthesis−based associations since Eocene and noted also in their Recent counterparts (Kiel and Goedert 2006b; Kiel et al. 2008b).
Fig. 9 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 9. The seguenzioid gastropod Cataegis nakagawensis sp. nov. from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. Holotype (UMUT MM30175) in apertural (A1), lateral (A2), and umbilical (A3) views. B. UMUT MM30176 in apical (B1), lateral (B2, B3), and latero−apical (B4) views. C. UMUT MM30177 in apical (C1), lateral (C2, C3), latero−umbilical (C4), and latero−apical (C5) views.
Fig. 2 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 2. The acmaeid gastropod Bathyacmaea cf. subnipponica Sasaki, Okutani, and Fujikura, 2003 from the Campanian (Upper Cretaceous) Omagari (A–C) and Yasukawa (D) seep sites in Hokkaido, Japan. A. NMM−228 in apical view. B. UMUT MM30143 in apical (B1), postero−lateral (B2), lateral (B3), and posterior views. C. UMUT MM30144 in apical (C1), lateral (C2), and anterior (C3) views. D. UMUT MM29353 attached to Cantrainea yasukawensis sp. nov. in apical (D1) and lateral (D2) view; D3 is a cross section through the shell showing three layers obliterated by diagenesis.
Fig. 13 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 13. Naticiform gastropod from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30189 in lateral (A1), latero−apical (A2), and apical (A3) views; A4, close up of the juvenile whorls, A5, close up of the initial whorl. B. UMUT MM30190 in lateral (B1), apertural (B2), and apical (B3) views. C. UMUT MM30191 in apertural (C1), lateral (C2), and apical (C3) views; C4, close up of the juvenile whorls in lateral view. D. UMUT MM30192 in lateral (D1), apical (D2), and umbilical (D3) views.
Fig. 8 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 8. The trochid gastropod Margarites sasakii sp. nov. from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30171 in apertural (A1) lateral (A2, A3), umbilical (A4), and apical (A5) views. B. UMUT MM30172 in apical (B1) and lateral (B2) views; B3, cross section through outer layer. C. Juvenile UMUT MM30173 in apical (C1), and lateral (C2–C4) views. D. Holotype (UMUT MM30174) in apical (D1) and lateral (D2–D4); note change in ornamentation in D4. E. NMM 229 in apical (E1), apertural (E2), and umbilical (E3) views.
Fig. 4 in Cosmopolitan Early Jurassic marine gastropods from west-central Patagonia, Argentina
Fig. 4. Southern hemisphere map showing the paleobiogeographical distribution of the cosmopolitan Jurassic gastropod genere reported herein. Note that the occurrence of the new Lower Toarcian gastropod association in "El Córdoba" fossiliferous locality (*) (Chubut province, Argentina) extends the paleobiogeographical distribution of the group in South America.
Fig. 3. Early Jurassic gastropods from Argentina A in Cosmopolitan Early Jurassic marine gastropods from west-central Patagonia, Argentina
Fig. 3. Early Jurassic gastropods from Argentina A. Zygopleuridae? gen. et sp. indet., "El Córdoba" fossiliferous locality, Chubut Province. MPEF−PI 1886, latex cast of external mold in lateral view. B–D. Cryptaulax damborenae sp. nov., "El Córdoba" fossiliferous locality, Chubut Province. B. MPEF−PI 1878b, holotype, latex cast of external mold in lateral (B1, B2) and basal (B3) views, ornament detail (B4). C. MPEF−PI 1877, paratype, latex cast of external mold of incomplete teleoconch in apertural view. D. MPEF−PI 1872b, paratype, latex cast of external mold of incomplete teleoconch in lateral view. E. Cryptaulax cf. damboreneae sp. nov., Cerro Puchenque locality, Mendoza Province. MLP 18742, latex cast of external mold of incomplete teleoconch; adult teleoconch in lateral view. F–H. Cryptaulax nulloi sp. nov., "El Córdoba" fossiliferous locality, Chubut Province. F. MPEF−PI 1870, holotype, latex cast of external mold. Adult teleoconch in lateral view (F1), juvenile teleoconch in lateral view (F2). G. MPEF−PI 1861, paratype, latex cast of external mold in lateral and apertural view. H. MPEF−PI 1871, latex cast of external mold of incomplete teleoconch in lateral view (H1), and its ornament detail (H2). Scale bars 1 mm.
Fig. 2 in Cosmopolitan Early Jurassic marine gastropods from west-central Patagonia, Argentina
Fig. 2. Early Jurassic gastropods from the "El Córdoba" fossiliferous locality, Chubut Province, Argentina. A. Amberleya? espinosa sp. nov. MPEF−PI 1882, holotype, latex cast of external mold in lateral view (A1, A2), juvenile teleoconch in lateral view (A3), last whorl in lateral view (A4), basal and apertural view (A5), ornament pattern and sutural detail (A6). B. Colpomphalus? sp. MPEF−PI 1863, latex cast of external mold of incomplete teleoconch in apical and lateral view (B1–B3), last whorl ornament detail showing the spiral furrow (B4). C. Striatoconulus sp. MPEF−PI 1867b, latex cast of external mold in apical view (C1), apical detail (C2), first teleconch whorls lateral view (C3). Scale bars 2 mm unless otherwise indicated.
Fig. 1. A in Cosmopolitan Early Jurassic marine gastropods from west-central Patagonia, Argentina
Fig. 1. A. Map of the western part of the South American continent showing the localities of new gastropod faunas in Argentina. 1, Cerro Puchenque, Mendoza; 2, Osta Arena Formation area in west−central Patagonia. B. Location map of "El Córdoba" fossiliferous locality (*).
Fig. 10 in Jurassic and Cretaceous gastropods from hydrocarbon seeps in forearc basin and accretionary prism settings, California
Fig. 10. Examples of "folded" rather than crushed shells. A. Paskentana globosa sp. nov. (CAS 70394) from Knoxville (Lower Cretaceous; site 9). B. Paskentana paskentaensis (Stanton, 1895) (UCMP 154113) from Rice Valley (Hauterivian?; site 3). C. Atresius liratus (CAS 70405) from Rocky Creek (Valanginian; site 7).
Fig. 9 in Jurassic and Cretaceous gastropods from hydrocarbon seeps in forearc basin and accretionary prism settings, California
Fig. 9. Gastropods of uncertain affinities from Early Cretaceous seep carbonates in California, USA. A. Stanton's (1895) "Cerithium" sp. (USNM 23081) from Cold Fork of Cottonwood Creek (Albian; site 1), image taken with light microscope (A1) and with SEM (specimen uncoated, A2). B. Fusiform gastropod (CAS 70403) from Rocky Creek (Valanginian; site 7). C. High−spired gastropod (CAS 70404) from W Berryessa (probably Valanginian; site 11).
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