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1,088 results for “Bivalves”
Fig. 5 in Chemosymbiotic bivalves from the late Pliocene Stirone River hydrocarbon seep complex in northern Italy
Fig. 5. The lucinid bivalve Megaxinus stironensis sp. nov. from the late Pliocene of Italy, Stirone River seep deposit. A. MGGC.22010, interior of left valve. B. MGGC.22011, exterior (B1) and interior (B2) of left valve of a large specimen. C. MGGC.22012, exterior of right valve (C1) and dorsal view (C2) of articulated specimen. D. NRM Mo184001, apical view of articulated specimen. E. MGGC.22013, internal mold showing strong radial striation on the thin veneer of remaining shell; this type of preservation is not uncommon at the Stirone River.
Fig. 3 in Chemosymbiotic bivalves from the late Pliocene Stirone River hydrocarbon seep complex in northern Italy
Fig. 3. The lucinid bivalve Megaxinus ellipticus (Borson, 1825) from the late Pliocene of Italy, Stirone River seep deposit. MGGC.22008, close-up of hinge region of RV (A), view of left valve exterior and right valve hinge (B), view of exterior of right valve (C); dorsal view on right valve (D).
Fig. 6 in Chemosymbiotic bivalves from the late Pliocene Stirone River hydrocarbon seep complex in northern Italy
Fig. 6. The lucinid bivalve Lucinoma persolida (Sacco, 1901) from the late Pliocene of Italy, Stirone River seep deposit. MGGC.22014, left (A) and right B) valves; in dorsal views (A1, B1), views of the interior including hinge and muscle attachment scars (A2, B2), and views of exterior (A3, B3).
Fig. 9 in Chemosymbiotic bivalves from the late Pliocene Stirone River hydrocarbon seep complex in northern Italy
Fig. 9. The lucinid bivalve Anodontia sp. from the late Pliocene of Italy, Stirone River seep deposit. A. MGGC.22017, smaller specimen, close-up of edentulous hinge area of left valve (A1), dorsal view (A2), and view of outer side of left valve (A3). B. MGGC.22018, larger specimen, left valve, exterior view.
Fig. 4 in Chemosymbiotic bivalves from the late Pliocene Stirone River hydrocarbon seep complex in northern Italy
Fig. 4. The lucinid bivalve Megaxinus stironensis sp. nov. from the late Pliocene of Italy, Stirone River seep deposit. MGGC.22009, holotype, left (A) and right (B) valves in dorsal views (A1, B1), views on the interior including hinge, muscle attachment scars and blood vessel attachment scar (A2, B2), and views of exterior (A3, B3).
Fig. 4 in Lucinid bivalves from Miocene hydrocarbon seep sites of eastern North Island, New Zealand, with comments on Miocene New Zealand seep faunas
Fig. 4. Lucinid bivalve Elliptiolucina neozelandica sp. nov. from the middle Miocene Bexhaven Limestone at Moonlight North (A, Y16/f1174; B–D, Y16/1059), North Island, New Zealand. A. UOA L4771 (holotype), dorsal view (A1), right (A2) and left (A3) valves. B. UOA L4783 (paratype), dorsal view (B1), right valve (B2), internal mould of left valve (B3), enlargement of anterior adductor muscle scar in B2 (B4). C. UOA L4775 (paratype), edentulous hinge plate of right valve (C1), left valve (C2). D. UOA L4774 (paratype), dorsal view (D1), right (D2) and left (D3) valves. Scale bars 10 mm.
Fig. 1 in Lucinid bivalves from Miocene hydrocarbon seep sites of eastern North Island, New Zealand, with comments on Miocene New Zealand seep faunas
Fig. 1. Overview of the geology of the East Coast, North Island, New Zealand (A, B), showing locations of known Miocene hydrocarbon seep sites. Northern sites: 1, Waiapu; 2, Waipiro; 3, Karikarihuata; 4, Bexhaven; 5, Tauwhareparae; 6, Puketawa; 7, Totaranui; 8, Moonlight North; 9, Rocky Knob; 10, Waikairo; 11, Turihaua. Southern sites: 12, Wanstead; 13, Ugly Hill; 14, Haunui; 15, Ngawaka; 16, Wilder; HSZ, Hikurangi subduction zone; M, Marlborough; TVZ, Taupo Volcanic Zone. Also shown are some of the modern offshore hydrocarbon seep sites of the Hikurangi subduction margin, and a hydrothermal vent location (inset). C. Cross-section (modified from Barnes et al. 2010) shows transpressive subduction of the Pacific Plate beneath the Australian Plate, and relationships of tectonic elements of the northern New Zealand plate margin (see Campbell et al. 2008 and Barnes et al. 2010 for further details on geologic context). The fossil lucinids of this study are described from fossil seep locations 4, 8, 9, 12–15.
Fig. 3 in Lucinid bivalves from Miocene hydrocarbon seep sites of eastern North Island, New Zealand, with comments on Miocene New Zealand seep faunas
Fig. 3. Lucinid bivalve Meganodontia haunuiensis sp. nov. from the lower Miocene Ihungia Limestone at Haunui (B–G, U23/270) and Ugly Hill A, U23/280), North Island, New Zealand. A. UOA L4777 (paratype), edentulous hinge plate of left valve (A1,), left valve (A2). B. UOA L4581 (holotype), dorsal view (B1) and frontal view (B2) of right valve. C. UOA L4791 (paratype), edentulous hinge plate of right valve. D. UOA L4790, right valve of small specimen. E. UOA L4782 (paratype), dorsal view of slightly compressed specimen (E1), left valve (E2). F. UOA L4792 (paratype), dorsal view showing symmetric lunule in both valves (F1), right valve showing internal mould (F2), enlargement of the anterior adductor muscle scar of F2 (F3). G. UOA L 4789, right valve, showing internal mould of small specimen. Scale bars 10 mm.
Fig. 2 in Lucinid bivalves from Miocene hydrocarbon seep sites of eastern North Island, New Zealand, with comments on Miocene New Zealand seep faunas
Fig. 2. Schematic drawing of a model lucinid bivalve with explanation of the main morphological terms used in this paper.
Fig. 6 in Lucinid bivalves from Miocene hydrocarbon seep sites of eastern North Island, New Zealand, with comments on Miocene New Zealand seep faunas
Fig. 6. Distribution of the ancient and Recent Meganodontia and Elliptiolucina. The Recent data are from Bouchet and Cosel (2004), Cosel and Bouchet 2008), and Glover and Taylor (2016). The fossil data are based on Kase et al. (2007), Kiel (2013), Kiel and Hansen (2015), Kiel and Taviani (2017), and this study.
Fig. 5 in Lucinid bivalves from Miocene hydrocarbon seep sites of eastern North Island, New Zealand, with comments on Miocene New Zealand seep faunas
Fig. 5. Lucinid bivalve Lucinoma saetheri sp. nov. from the lower Miocene Ihungia Limestone at Ugly Hill (D, F, U23/266) and the middle Miocene Bexhaven Limestone at Moonlight North (A, C, E, Y16/1059; B, Y16/f1174), North Island, New Zealand. A. UOA L4773 (paratype), internal mould of right valve. B. UOA L 4772 (paratype), hinge plate of right valve. C. UOA L4785, left (C1) and right (C2) valves. D. UOA L4780 (holotype), dorsal view D1), right (D2) and left (D3) valves. E. UOA L4786, right valve. F. UOA L 4779 (paratype), left valve showing lamellated commarginal riblets (F1), dorsal view (F2). Scale bars 10 mm.
Fig. 6 in Three new bivalve genera from Triassic hydrocarbon seep deposits in southern Turkey
Fig. 6. The kalenterid bivalve Kasimlara sp. from the late Carnian, Late Triassic Terziler II seep deposit in southern Turkey. Mo184065, single left valve; view on the dorsal (A1) and the ventral (A3) sides, lateral view (A2).
Fig. 5 in Three new bivalve genera from Triassic hydrocarbon seep deposits in southern Turkey
Fig. 5. The kalenterid bivalve Kasimlara kosuni gen. et sp. nov. from the late Carnian, Late Triassic Terziler III seep deposit in southern Turkey. A. Mo184063, internal mold of an articulated specimen; left (A1) and right (A2) valves, dorsal (A3) and ventral (A4) sides, showing the curvature of the shell. B. Mo184064, internal mold of articulated specimen; left (B1) and right (B2) valves, dorsal (B3) and ventral (B4) sides, showing the curvature of the shell; note the strong, healed predation scars on the posterior side of the left valve (B1) and on the posteroventral side of the right valve (B4).
Fig. 8 in Three new bivalve genera from Triassic hydrocarbon seep deposits in southern Turkey
Fig. 8. The pholadomyoid bivalve Aksumya krystyni gen. et sp. nov. from the late Carnian, Late Triassic Leo's Terziler seep deposit in southern Turkey. A. Mo184067, holotype, close-up on the small shell spines. B. Mo184072, specimen with preserved ligament.
Fig. 3 in Three new bivalve genera from Triassic hydrocarbon seep deposits in southern Turkey
Fig. 3. The kalenterid bivalve Terzileria gregaria gen. et sp. nov. from the late Carnian, Late Triassic Terziler III seep deposit in southern Turkey. A. Mo184056, specimen with preserved shell showing irregular growth increments; right valve (A1) and dorsal view (A2). B. Mo184057, left valve of an internal mold, note mantle muscle scars along the pallial line. C. Mo184058, right valve of a specimen. D. Mo184059, shell fragment preserving the posterodorsal part of the inner shell surface of a left valve. E. Mo184060, internal mold showing the impression of the posterior lateral tooth in the left valve (E1) and the lack of this feature in the right valve (E2).
Fig. 9 in Three new bivalve genera from Triassic hydrocarbon seep deposits in southern Turkey
Fig. 9. The pholadomyoid bivalve Aksumya krystyni gen. et sp. nov. from the late Carnian, Late Triassic in southern Turkey; polished surfaces of cross sections showing hinge and nymph details. A. Mo184073 from Dumanlı I; cross section cut horizontally through the umbones, showing hinge (white arrows) and ligament nymph (black arrows). B. Mo184074 from Terziler III, vertical cross section showing hinge area just below umbo, seen from the anterior; white dotted line in B2 indicates the hinge area, black dotted line indicates the inferred shell material of the umbones. Abbreviations: LV, left valve; RV, right valve.
Fig. 4 in Three new bivalve genera from Triassic hydrocarbon seep deposits in southern Turkey
Fig. 4. The kalenterid bivalve Kasimlara kosuni gen. et sp. nov. from the late Carnian, Late Triassic Terziler III seep deposit in southern Turkey. A. Mo184061, holotype, large internal mold of right valve; lateral (A1), lateral-ventral (A2), ventral (A3), lateral-dorsal (A4), and anterior (A5) views. B. Mo184062, internal mold of anterior part of left valve; showing tubercles (as pits in the mold) on the lateral side of the shell's interior (B1), fine radial striation on the dorsal inner side of the shell (B2), ventral view on the dorsal inner side of the shell (B3), anterior side, note the strong inflation of the shell (B4).
Fig. 2 in A new genus of lucinid bivalve from hydrocarbon seeps
Fig. 2. Plot of length versus height data for Elongatolucina elassodyseides, E. sp. aff. Elassodyseides, and Elliptiolucina magnifica holotype.
Fig. 1 in A new genus of lucinid bivalve from hydrocarbon seeps
Fig. 1. Composite sketch of Elongatolucina showing right valve internal shell features. Image produced by James McKay (University of Leeds, UK).
Fig. 5 in Worldwide distribution of the modiomorphid bivalve genus Caspiconcha in late Mesozoic hydrocarbon seeps
Fig. 5 Lectotype of modiomorphid bivalve Caspiconcha major (Gabb, 1869) MCZ 108539 from east of Knoxville, California, USA, Lower Cretaceous. The pairs A and B, C and D, and E and F are the same views, respectively with and without morphological interpretations. A, B. Left valve. C, D. Right valve. The shell of the specimen is missing forward of the anterior adductor muscle scar, leaving an internal mould. E, F. Dorsal view. G. Detail of ligament area of left valve. White arrowheads point to the anterior.
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