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51 results for “Bivalve evolution”
Data from: Comparative transcriptomics revealed parallel evolution and innovation of photosymbiosis molecular mechanisms in a marine bivalve
<p>Photosymbioses between heterotrophic hosts and autotrophic symbionts are evolutionarily prevalent and ecologically significant. However, molecular mechanisms behind such symbioses remain less elucidated, which hinders our understanding of their origin and adaptive evolution. This study compared gene expression patterns in a photosymbiotic bivalve (<em>Fragum sueziense</em>) and a closely related non-symbiotic species (<em>Trigoniocardia granifera</em>) under different light conditions to detect potential molecular pathways involved in mollusk photosymbiosis. We discovered that the presence of algal symbionts greatly impacted host gene expression in symbiont-containing tissues. We found that the host immune functions were suppressed under normal light compared to those in the dark. In addition, we found that cilia in the symbiont-containing tissues play important roles in symbiont regulation or photoreception. Interestingly, many potential photosymbiosis genes could not be annotated or do not exhibit orthologs in <em>T. granifera</em> transcriptomes, indicating unique molecular functions in photosymbiotic bivalves. Overall, we found both novel and known molecular mechanisms involved in animal-algal photosymbiosis within bivalves. Given that many of the molecular pathways are shared among distantly related host lineages, such as mollusks and cnidarians, it indicates that parallel and/or convergent evolution is instrumental in driving host-symbiont adaptations in diverse organisms.</p>
Data for: Convergence and contingency in the evolution of a specialized mode of life: Multiple origins and high disparity of rock-boring bivalves
<p>Evolutionary adaptation to novel, specialized modes of life is often associated with close mapping of form to function, resulting in narrow morphological disparity. For Bivalvia, endolithy (rock-boring) has biomechanical requirements thought to diverge strongly from those of the ancestral shallow-burrowing habit in soft sediments. However, 3D morphometric data from 73 species among ~94% of extant endolithic genera and families, along with 384 non-endolithic species in those families, show that endolithy has originated at least eight times. Endolithy is evolutionarily accessible from multiple morphological starting points, evidenced by the morphologies of the oldest fossil members of families. Although some endoliths appear to converge on a limited set of shell morphologies, the total range of endolith shell morphologies among the broadest for bivalve life habits, and lacks any unifying morphological trait. Nevertheless, endolithy is a taxon-poor habit today. This limited richness evidently does not derive from damped origination or heightened extinction rates on lineages containing endoliths, and today's endoliths are not confined to low diversity biogeographic regions. Instead, endolithy may be limited by habitat availability. Both determinism (convergence among distantly related taxa) and contingency (endoliths remain close to the disparate morphologies of their source clades) underlie the occupation of endolith morphospace.</p>
Data from: Comparative transcriptomics revealed parallel evolution and innovation of photosymbiosis molecular mechanisms in a marine bivalve
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Data for: Convergence and contingency in the evolution of a specialized mode of life: Multiple origins and high disparity of rock-boring bivalves
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Hard to get, easy to lose: Evolution of mantle photoreceptor organs in bivalves (Bivalvia, Pteriomorphia)
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Nucula specimen data used for: Testing the ‘Plus ça Change’ model: A comparison of Nuculid bivalve evolution across contrasting broad-scale climatic regimes
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Data from: Phylogeography of a pan-Atlantic abyssal protobranch bivalve: implications for evolution in the Deep Atlantic
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Data from: Morphological evolution of the bivalve Ptychomya through the Lower Cretaceous of Argentina
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Figure 9 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 9 Tellina siebenrocki Sturany, 1899, locality 45, Ras Mujamila, Yemen. A, B, D, F, H, I Holotype NHMW 38016: right valve exterior (A), interior (B), and hinge detail (D); left valve exterior (F), interior (H), and hinge detail (I). C, E, G, J Original figures. K Original label. Scale bars: 1 mm (D, I); 2 mm (A, F).
Figure 8 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 8 Raeta bracheon Sturany, 1899, Station 87, Ra's Mal'ab in the Gulf of Suez, Egypt, 50 m. A, B, J–M Original figures. C–F, H, I Figured syntypes NHMW 84335: right valve exterior (C) interior (E), and hinge detail (H); left valve exterior (D), interior (F), and hinge detail (I). G Original label. Scale bars: 5 mm (C, D); 2 mm (H, I).
Figure 7 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 7 Scintilla variabilis Sturany, 1899. A–D, F, G, I, J, L–O Syntype NHMW 38099: left valve exterior (A, B), interior (F–G) and hinge detail (C, D). Right valve exterior (I, J), interior (L, M) and hinge detail (N, O). E, H, K, P Original figures. Q Original label. Scale bars: 0.5 mm (C, D, N, O); 2 mm (A, I).
Figure 6 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 6 Scintilla sulphurea Sturany, 1899, near Abu Ghusun, Egypt. A–D, F, G, I, J, L–O Holotype NHMW 38098: left valve exterior (A, B) interior (F, G), and hinge detail (C, D); right valve exterior (I, J), interior (L, M), and hinge detail (N, O). E, H, K, P Original figures. Q Original label. Scale bars: 0.5 mm (C, D, N, O); 2 mm (A, I).
Figure 4 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 4 Cardita akabana Sturany, 1899, northern part of the Gulf of Aqaba, −350 m. A, D, F Original figures. B, E, C Figured syntype NHMW 84343: right valve exterior (B), interior (E), and hinge detail (C). G Original label. Scale bars: 3 mm (B); 2 mm (C).
Figure 21 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 21 Lyonsia intracta Sturany, 1899, Station 130, west of Al Qunfudhah, Saudi Arabia, −439 m, A, B, F Original figures. C–E, G, H Syntype NHMW 84300: right valve interior (C), exterior (D), hinge detail (E) and sculpture details of the posterior (G) and anterior (H) valve parts. Scale bars: 1 mm (C); 0.5 mm (E, G, H)
Figure 3 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 3 Amussium steindachneri Sturany, 1899, Station 128, Akik Seghir, Eritrea, −457 m. A, D Original figures (rotated by 180°). B, C, E, F Lectotype NHMW 84350: right valve exterior (B), interior (C, E), and hinge detail (F). G Original label. Scale bars: 1 mm.
Figure 20 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 20 Pseudoneaera thaumasia Sturany, 1899, Station 48, off Yanbu' al Bahr, Saudi Arabia, −700 m. A, D, I, N Original figures. B, C, E–H, J–M, O, P Figured syntype NHMW 84330: left valve exterior (B, C), interior (G, H) and hinge detail (J, K); right valve exterior (E, F), interior (L, M) and hinge detail (O, P). Q Original label. Scale bars: 1 mm (B, E); 0.5 mm (J, K, O–P).
Figure 2 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 2 Amussium siebenrocki Sturany, 1899, Station 72, Shadwan Island, Egypt, −1082 m. A, D, G, I Original figures (rotated by 180°). B, C, E, F, H, J, L Lectotype NHMW 84355: right valve exterior (B, C), interior (H), and hinge detail (L). Left valve exterior (E, F) and interior (J). K Original label. Scale bars: 1 mm (B, E), 0.1 mm (L).
Figure 5 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 5 Tridacna elongata var. squamosina Sturany, 1899. A–F. Lectotype NHMW 107075: right valve exterior (A) and interior (B), left valve exterior (C) and interior (D), back view (E), front view (F). Scale bar: 2 cm.
Figure 19 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 19 Cuspidaria steindachneri Sturany, 1899, station 121, west of Al Qunfudhah, Saudi Arabia, −690 m. A, B, E, F, L Original figures. C, D, G–J Figured syntype NHMW 84311: left valve exterior (C), interior (G) and hinge detail (I). Right valve exterior (D), interior (H) and hinge detail (J). K Original label. Scale bars: 3 mm (C, G); 1 mm (I–J).
Figure 17 from: Albano PG, Schnedl S-M, Janssen R, Eschner A (2019) An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea bivalves. Zoosystematics and Evolution 95(2): 557-598. https://doi.org/10.3897/zse.95.38229
Figure 17 Cuspidaria dissociata Sturany, 1899, Station 106, south of Jeddah, Saudi Arabia, 21°2'N, 38°41.4'E, −805 m. A, B, E–F Original figures. C, D, G–J Lectotype NHMW 84318: left valve exterior (C), interior (G), and hinge detail (I); right valve exterior (D), interior (H), and hinge detail (J). K Original label. Scale bars: 1 mm.
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