caa a22 4500 388017554 CHVBK 20180307124915.0 cr unu---uuuuu 161130e199811 xx s 000 0 eng 10.1017/S0022336000027359 doi S0022336000027359 pii (NATIONALLICENCE)cambridge-10.1017/S0022336000027359 Thermal potentiation and mineralogical evolution in the Bivalvia (Mollusca) [Elektronische Daten] [Joseph G. Carter, Enriqueta Barrera, Michael J. S. Tevesz] The most important factor controlling the timing of Phanerozoic mineralogical evolution in the Bivalvia appears to be thermal potentiation of calcite deposition in colder marine and estuarine environments. Cold temperature has promoted mineralogical evolution in the Bivalvia by kinetically facilitating (potentiating) initially weak biological controls for calcite, thereby exposing their genetic basis to natural selection. Calcite has evolved in bivalve shells for a variety of selective advantages, including resistance to dissolution; resistance to chemical boring by algae and gastropods; reduced shell density in swimming and soft-bottom reclining species; enhanced flexibility in simple prismatic shell layers; and fracture localization and economy of secretion in association with certain foliated structures. Endogenous calcite in bivalve shells varies from biologically induced to weakly and strongly biologically controlled. Biologically controlled calcite generally first appears in bivalve shells as an impersistent component of the outer shell layer, only later, in some groups, expanding to include the entire outer and then part or all of the middle and inner shell layers. The initial stages of mineralogical evolution are shown by certain modern Mytilidae, Veneridae and Petricolidae. In the latter two families, the calcite occurs as conellae in the outer part of the outer shell layer. Calcitic conellae in the inner shell layer of Pliocene Mercenaria are not barnacle plates, as previously indicated, but endogenous calcite comparable in origin to other venerid conellae. Their occurrence in Mercenaria may reflect thermal potentiation of weak biological controls for calcite, as well as local detachment of the secretory mantle epithelium near the pallial and adductor musculature. Copyright © The Paleontological Society Carter Joseph G. Department of Geology, University of North Carolina at Chapel Hill 27599-3315 aut Barrera Enriqueta Department of Geology, University of Akron, Akron, Ohio 44325 aut Tevesz Michael J. S. Department of Biological, Geological, and Environmental Sciences, Cleveland State University, Cleveland, Ohio 44115 aut Journal of Paleontology Cambridge University Press 72/6(1998-11), 991-1010 0022-3360 72:6<991 1998 72 JPA https://doi.org/10.1017/S0022336000027359 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022336000027359 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Carter Joseph G. Department of Geology, University of North Carolina at Chapel Hill 27599-3315 aut NATIONALLICENCE 700 1- Barrera Enriqueta Department of Geology, University of Akron, Akron, Ohio 44325 aut NATIONALLICENCE 700 1- Tevesz Michael J. S. Department of Biological, Geological, and Environmental Sciences, Cleveland State University, Cleveland, Ohio 44115 aut NATIONALLICENCE 773 0- Journal of Paleontology Cambridge University Press 72/6(1998-11), 991-1010 0022-3360 72:6<991 1998 72 JPA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge