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Fig. 9 in The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy, and paleogeographic implications

Fig. 9. Palaeobiogeography of Pholadomya gigantea (Sowerby, 1836) during the Early Cretaceous. Hauterivian–Barremian palaeocoastline map from Smith et al. (1994); records of Pholadomya gigantea are compiled in Appendix 1.

Fig. 3 in The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy, and paleogeographic implications

Fig. 3. Orientations of measurements in Pholadomya. A. Left lateral view. B. Dorsal view. C. Posterior view. Abbreviations: Al, anterior length; H, height; Hs, height of siphonal gape; L, length; W, width; Ws, width of siphonal gape. Measurements in Table 1.

Fig. 8 in The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy, and paleogeographic implications

Fig. 8. Inferred life position of Pholadomya gigantea (Sowerby, 1836) from the Early Cretaceous of the Neuquén Basin, west−central Argentina. A passive deep burrowing habit is interpreted for this species, which has a large pallial sinus, siphonal gape, and thin posterior elongated shell. Angle between the shell and the sediment−water interface may be variable. Soft parts from Morton (1980).

Fig. 1. The vesicomyid bivalve Pleurophopsis unioides Van Winkle, 1919 in Status of the enigmatic fossil vesicomyid bivalve Pleurophopsis

Fig. 1. The vesicomyid bivalve Pleurophopsis unioides Van Winkle, 1919 from middle Miocene strata of Trinidad, Neotype (PRI 28452). A. Lateral view of left valve, note that the number written on specimen is the former Cornell University number. B. Dorsal view of hinge area. C–H. Silicone rubber casts of neotype illustrating hinge features. C. Hinge and anterior adductor scar of left valve in lateral view. D. Close−up of C. E. Ventral view of left valve hinge. F. Hinge and anterior adductor scar of right valve in lateral view. G. Close−up of F, slightly tilted ventro−lateral view. H. Ventral view of right valve hinge. Abbreviations: aas, anterior adductor scar; aprs, anterior pedal retractor scar; card., cardinal tooth; LV, left valve, RV, right valve.

opencc-zeroJan 2024View details →

Linked collectors and determiners for: Mayborn Museum Bivalves Collection at Baylor University.

Natural history specimen data linked to collectors and determiners held within, "Mayborn Museum Bivalves Collection at Baylor University". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/2494a4fe-a71c-44a2-9045-d34b713d79c0">https://bionomia.net/dataset/2494a4fe-a71c-44a2-9045-d34b713d79c0</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/2494a4fe-a71c-44a2-9045-d34b713d79c0">https://gbif.org/dataset/2494a4fe-a71c-44a2-9045-d34b713d79c0</a>. Formatted as a Frictionless Data package.

opencc-zeroSep 2015View details →

FIG. 1. — A in Bivalves (Mollusca) from the Coniacian-Santonian Anguille Formation from Cap Esterias, Northern Gabon, with notes on paleoecology and paleobiogeography

FIG. 1. — A, Location map of Gabon and Cap Estréias; B, geological map of north Gabonese coastal basin; C, lithostratigraphy of the 'Cap Estérias' section. Geological map after Lanau (1985).

opencc-zeroSep 2015View details →

FIG. 4. — A, Q in Bivalves (Mollusca) from the Coniacian-Santonian Anguille Formation from Cap Esterias, Northern Gabon, with notes on paleoecology and paleobiogeography

FIG. 4. — A, Q, Granocardium? sp. 2; B, Acanthocardia cf. denticulata (Baily, 1855); C, Granocardium productum (Sowerby, 1832); D, Granocardium sp. 1; E, Protocardia? sp.; F, H, L, P, Agelasina plenodonta Riedel, 1932; G, J, Protocardia cf. pauli (Coquand, 1862); I, Aphrodina dutrugei (Coquand, 1862); K, Atrina laticostata (Stoliczka, 1871); M, Anofia? sp.; N, Plagiostoma pseudohoernesi (Riedel, 1932); O, Aphrodina gabonensis Dartevelle & Freneix, 1957. Scale bar: 2 cm.

opencc-zeroSep 2015View details →

FIG. 3 in Bivalves (Mollusca) from the Coniacian-Santonian Anguille Formation from Cap Esterias, Northern Gabon, with notes on paleoecology and paleobiogeography

FIG. 3. — Palaeobiogeographical distribution of bivalves fauna of 'Cap Estérias' in the Late Cretaceous. Geological map modified after Vrielynck & Bouysse (2003).

Fig. 5. Berthelinia singaporensis development. A–D in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 5. Berthelinia singaporensis development. A–D, SEM micrographs of larval shells of newly hatched veligers from different aspects, showing sinistral coiling, suture (C), and faint growth lines (C–D); E, SEM micrograph of larval operculum; F, light micrograph of newly hatched veliger larva showing the radula (circled).

Fig. 3 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 3. Intra-capsular development of Berthelinia singaporensis. A, complete gastrula (day 3); B, early veliger, shell not coiled; velum visible (day 4); C, D, early veliger (day 5) with pigment along shell aperture and in suture; E, veliger larvae (day 6) with eyespots; F, large veliger larvae (day 10) with operculum (arrowhead) and foot (arrow).

Fig. 1 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 1. Adult Berthelinia singaporensis, spawning and complete egg masses. A, specimen on Caulerpa racemosa; B, specimen crawling on petri-dish; C, D, specimen spawning. Notice head moving from side to side and opaque content of egg capsules during spawning (circled in D). E, complete egg mass on Caulerpa lentillifera; F, another egg mass with more developed embryos. Blue arrows indicate eggs moving inside oviduct through mucus gland; red arrowheads indicate eggs exiting female gonopore and being transported along spawn groove to mouth area.

Fig. 8 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 8. Juvenile development of Berthelinia singaporensis. A–B, right side and dorsal view of late metamorphosis stage; right valve soft and smaller, hinge line complete; C–D, left and right view of early juvenile; right and left valves same size; E, larger juvenile on Caulerpa; F, larger juvenile with adult shell shape (taller anteriorly) and some brown pigment spots.

Fig. 11 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 11. SEM micrographs of early juvenile Berthelinia singaporensis. A, right side view showing right valve smaller than left one; B, close-up of hinge line of same showing growth lines continuous across hinge line and right valve flatter than left one; C, left valve of older juvenile showing gap between protoconch aperture and juvenile shell; D, close-up of thickened hinge of same.

Fig. 2 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 2. Early development of Berthelinia singaporensis embryos. A, uncleaved eggs; B, 2-cell stage; C, 2–4-cell stages (1 h); D, 4-cell stage (1 h 20 min); E, 8-cell stage (3 h); F, multi-cell stage (6 h); G, blastula (22 h); H, early gastrula (23 h). Times in parentheses are after first cell division. In E and F, the spiral cleavage pattern is distinct.

Fig. 4 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 4. Hatched larvae of Berthelinia singaporensis. A, veliger larva shortly after hatching; large velar lobes with long cilia; B, newly hatched larva; long cilia on propodial margins as well as on velum; C, crawling veliger larva on Caulerpa (probably C. taxifolia); D, crawling larva from behind, with circular operculum (arrowhead).

Fig. 7 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 7. Stages of shell metamorphosis in Berthelinia singaporensis. A–B, right and left side views of transitional stage with soft, flexible shell flared; C, dorsal view with fold and downwards bent right side of shell; D, right side view with tilted protoconch.

Fig. 10 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 10. SEM micrographs of shell of Berthelinia singaporensis in metamorphosis stage. A, left side of visor-like shell and anterior flared fold; B, ventral view of visor with dried part of mantle fold in aperture; C, close-up of same showing fracture line (arrowhead) where hinge line will form; D, higher magnification of same. In A–C the narrow gap between larval shell (= protoconch) and juvenile shell is visible.

Fig. 6 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 6. Stages of shell metamorphosis in Berthelinia singaporensis. A, initial growth of visor-shaped shell (arrowhead); B–C, pedi-veligers on Caulerpa with increasing visor; in C veliger shell is tilted; D, first appearance of fold in visor (arrow) looking like notch.

Fig. 9 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development

Fig. 9. Juvenile development of Berthelinia singaporensis (continued). A, two specimens on Caulerpa; smaller white one with many brown pigment spots, larger specimen completely green with some brown spots; B, close-up of protoconch area of larger specimen showing green contents of digestive gland extending into protoconch.