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Prezant, R. S., & Carriker, M. R. (1983). Functional microstructure of the lithodesma of mytilimeria nuttalli (bivalvia: anomalodesma). The Veliger, 25, 326–329.

Prezant, R. S. (1983). Auto-drilling in the oyster drill Thais haemastoma (Muricidae). The Nautilus, 97, 81–84.

Prezant, R. S. (1984). Functional microstructure and mineralogy of the byssal complex of Anomia simplex orbigny (Bivalvia: Anomiidae). American Malacological Bulletin, 2, 41–50.

Prezant, R. S., & Chalermwat, K. (1984). Flotation of the bivalve Corbicula fluminea as a means of dispersal. Science, 225(4669), 1491–1493. https://doi.org/10.1126/science.225.4669.1491

Prezant, R. S., & Tan-Tiu, A. (1985). Comparative shell microstructure of North American Corbicula (Bivalvia: Sphaeriacea). The Veliger, 27(3), 312–319.

Prezant, R. S. (1985). Molluscan mucins: a unifying thread. American Malacological Bulletin Special Issue, 1, 35–50.

Prezant, R. S. (1985). Derivations of arenophilic mantle glands in the Anomalodesmata. Malacologia, 26(1–2), 273–275.

Brown, B., & Prezant, R. S. (1986). Occurrence of a digenetic trematode in a polychaete. Journal of Invertebrate Pathology, 48, 239–241. https://doi.org/10.1016/0022-2011(86)90129-1

Prezant, R. S. (1986). Entrainment of larval oysters by hydraulic cutterhead dredges: An introduction. Entrainment of Larval Oysters, American Malacological Bulletin, 1–4.

Prezant, R. S., & Tiu, A. T. (1986). Spiral Crossed-Lamellar Shell Growth in Corbicula (Mollusca: Bivalvia). Transactions of the American Microscopical Society, 105(4), 338–347. https://doi.org/10.2307/3226519

Spiral and near-spiral growth patterns of the peripheral crossed-lamellar shell microstructure of the bivalve Corbicula cf. fluminea have been discovered. This is the first report of spiral microstructures outside of nacreous and "foliated calcite" deposits. The spiral growth surface in this corbiculid is underlain by a conical crossed-lamellar microstructure. This form of lath deposition is usually associated with high concentrations of organic material located beneath the undertucked periostracum along the valve's periphery. These structures can offer the bivalve additional resistance against predators that enter the valves through the shell's edge. Similar spiral structures have not been found in all "white" forms of North American Corbicula, in the "purple" form of North American Corbicula, nor in the corbiculids Polymesoda caroliniana and P. (Geloina) erosa.

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Tiu, A., & Prezant, R. (1987). Shell microstructure responses of the Atlantic ribbed mussel Geukensia demissa granosissima induced by transplantation. American Malacological Bulletin, 5, 173–176.

Prezant, R. S., Tiu, A. T., & Chalermwat, K. (1988). Shell microstructure and color changes in stressed Corbicula fluminea (Bivalvia: Corbiculidae). The Veliger, 31(3–4), 236–243.

Tan Tiu, A., & Prezant, R. (1989). Seasonal variation of microstructure of inner structure of shell in Corbicula fluminea (Bivalvia: Heterodonta). American Malacological Bulletin, 7(1), 65–71.

Tan Tiu, A., & Prezant, R. S. (1989). Shell tubules in Corbicula fluminea (Bivalvia: Heterodonta): functional morphology and microstructure. Shell Tubules in Corbicula Fluminea (Bivalvia: Heterodonta): Functional Morphology and Microstructure, 103(1), 36–39.

Prezant, R. (1990). Form, function, and phylogeny of bivalve mucins. The Bivalvia. Proceedings of a Memorial Symposium in Honour of Sir Charles Maurice Yonge, 71–92.

Prezant, R. (1990). Shell and hinge ontogeny of the Antarctic bivalve Lissarca notorcadensis. Journal of the Marine Biological Association of the United Kingdom, 70, 841–855. https://doi.org/10.1017/S0025315400059105

Lissarca notorcadensis, a small pallial-brooding mollusc with a circum-Antarctic distribution, is frequently found attached by stout byssal threads to the spines of sea urchins. Here, complete ontogenetic series can be found. Using standard, structural definitions, the prodissoconch I of L. notorcadensis is small compared to the large prodissoconch II, a feature atypical of brooded young and possibly reflective of a planktotrophic past. Fine commarginal striae are found on prodissoconch II of this subtidal clam, which also possesses more pronounced commarginal striae on the dissoconch prior to brood release. The provinculum is retained and remains functional well into adulthood. A small central ligament pit is present through the postlarval stages. This develops into a large, triangular pit in adulthood that shows obvious growth lines. Calcareous, presumably aragonitic fibres develop in the ligament of specimens still retained in the adult brood. Five to six adult hinge teeth are formed on either side of the ligament. Alignment of shell valves by these well-developed teeth is augmented by retention of larval denticles. The functional and structural demise of the provinculum occurs between 4 and 7 mm shell height and results from denticle erosion and subumbonal shell overgrowth. Many canals permeate larval and adult valves, but external pores in the adult shell differ from those of the larval shell and could indicate mode of formation. Prodissoconch form, provinculum retention, and shell canals are considered primitive traits.

Carriker, M. R., Swann, C. P., Prezant, R. S., & Counts, C. L. (1991). Chemical elements in the aragonitic and calcitic microstructural groups of shell of the oysterCrassostrea virginica: A proton probe study. Marine Biology, 109(2), 287–297. https://doi.org/10.1007/BF01319397

We report the results of a study with proton-induced X-ray emissions (PIXE) of the distribution and concentration of 15 chemical elements (Na to Sr in periodic chart) in four microstructural and two mineralogical regions of shell of rapidly growing adult oysters [Crassostrea virginica (Gmelin)]. Hatchery-raised oysters were grown in Broadkill Estuary, Delaware, USA, for 16 wk in summer 1978. Their valve edges were filed as a marker, and the oysters were replaced in the estuary, where they grew rapidly. Shell deposited after marking had a normal microstructure and mineralogy after a narrow zone of disturbance. After 17 d oysters were sacrificed, and different mineralogical and microstructural regions of valves of three oysters, and parts of valves of two oysters, were analyzed for the elements Na to Sr. Quadrats (2.5 × 0.45 mm) included three calcitic groups (prismatic, foliated, chalky) and one aragonitic (myostracal) microstructural group; four quadrats were on the exterior and five on the interior of right and left valves. Inhalant and exhalant margins of valves and ground right and left valves of one oyster were also analyzed. Elemental chemistry of different regions of shell varied among the three microstructural groups within the single calcitic polymorph, between aragonitic and calcitic regions, and between exhalant and inhalant margins of the valves. Elements were most concentrated in the prismatic region of the right valve. Element concentrations were similar in ground right and left valves, except for higher levels of Si, Fe, and Zn in the right valve (corresponding to their high contents in prismatic shell) and of Cl in the left valve (reflecting high concentration in chalky shell, abundant in this valve). Na, Mg, Cl, Cr, Cu, Zn and Br were more concentrated in prismatic than in foliated shell. Chalky shell contained higher concentrations of Na than did prismatic shell, and high concentrations (but lower than in prismatic shell) of Mg, Cl, Ti, Mn, Fe, Zn and Br. Element concentration in myostracum was approximately the same as, or lower than, in foliated shell, except for Sr, which was higher than that in any other shell group. In the right valve most elements were concentrated in inhalant margins, and on the left valve, in exhalant margins. With increased weathering of the exterior surface of prismatic shell, Mg, Si, and Mn increased in concentration and Na, Al, Cl, Ti, Cr, Fe, Br, and Sr decreased.

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