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The chamber formation cycle in Nautilus macromphalus

Published online by Cambridge University Press:  08 February 2016

Peter Ward ,
Lewis Greenwald  and
Yves Magnier
Peter Ward
Affiliation:
Department of Geology, University of California, Davis, California 95616
Lewis Greenwald
Affiliation:
Department of Zoology, Ohio State University, Columbus, Ohio 43210
Yves Magnier
Affiliation:
Aquarium of Noumea and O.R.S.T.O.M., Noumea, New Caledonia
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Abstract

The chamber formation cycle in externally shelled, chambered cephalopods consists of mural ridge formation, secretion of the siphuncular connecting ring, septal calcification, and cameral liquid removal. Radiographic observation of the chamber formation cycle in specimens of Nautilus macromphalus allows direct observation of the various processes of the chamber formation cycle in a chambered cephalopod, and gives direct measures of rates. New chamber formation in N. macromphalus initiates when slightly more than half of the cameral liquid has been removed from the last formed chamber. At this volume, the liquid within the chamber drops from direct contact with the permeable connecting ring to a level where it is no longer in direct contact and must move onto the connecting ring due to wettable properties of the septal face and septal neck. This change from “coupled” to “decoupled” emptying coincides with the formation of a mural ridge at the rear of the body chamber, in front of the last formed septum. With completion of the mural ridge, the septal mantle moves forward from its position against the face of the last formed septum and attaches to the new mural ridge, where it begins calcifying a new septum in front of the newly created, liquid-filled space. Emptying of the new cameral liquid from this space commences when the calcifying septum has reached from one-third to two-thirds of its final thickness. The cessation of calcification of the septum coincides with a liquid volume in the new chamber of approximately 50%, at which point the cycle begins anew. During the chamber formation cycle apertural shell growth appears to be continuous. Since apertural shell growth is the prime factor leading to increased density in seawater, and hence decreased buoyancy, the period in the chamber formation cycle between the onset of septal calcification and the onset of emptying would be a time of greatly decreasing buoyancy. This is avoided by the removal of decoupled liquid from previously produced chambers. In this way constant neutral buoyancy is maintained. The time between chamber formation events in aquarium maintained N. macromphalus appears to be between 70 and 120 d.

Type
Articles
Information
Paleobiology , Volume 7 , Issue 4 , Fall 1981 , pp. 481 - 493
Copyright
Copyright © The Paleontological Society 

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References

Literature Cited

Bandel, K. and von Boletzky, S. 1979. A comparative study of the structure, development and morphological relationships of chambered cephalopod shells. Veliger. 21:313–354.Google Scholar
Blind, W. 1976. Die ontogenetische Entwicklung von Nautilus pompilius (Linné). Palaeontographica, Abt. A. 153:117–160.Google Scholar
Blind, W. 1980. Über Anlage und Ausformung von Cephalopoden-Septum. N. Jb. Geol. Paläontol. Abh. 160:217–240.Google Scholar
Collins, D. and Minton, P. 1967. Siphuncular tube in Nautilus. Nature. 216:916–917.CrossRefGoogle ScholarPubMed
Collins, D., Ward, P., and Westermann, G. 1980. Function of cameral water in Nautilus. Paleobiology. 6:168–172.CrossRefGoogle Scholar
Denton, E. J. and Gilpin-Brown, J. B. 1966. On the buoyancy of the pearly Nautilus. J. Mar. Biol. Ass. U.K. 46:723–759.CrossRefGoogle Scholar
Denton, E. J. and Gilpin-Brown, J. B. 1973. Flotation mechanisms in modern and fossil cephalopods. Adv. Mar. Biol. 11:197–268.CrossRefGoogle Scholar
Diamond, J. and Bossert, W. 1967. Standing gradient osmotic flow. A mechanism for coupling of water and solute transport in epithelia. J. Gen. Physiol. 50:2062–2083.Google ScholarPubMed
Dott, R. and Batten, R. 1981. Evolution of the Earth. 3rd ed.573 pp. McGraw-Hill.Google Scholar
Erben, H., Flajs, G., and Siehl, A. 1969. Die frühontogenetische Entwicklung der Schalenstruktur ectocochleater Cephelopoden. Paleontographica, Abt. A. 132:1–54.Google Scholar
Gregoire, C. 1962. On the submicroscopical structure of the Nautilus shell. Bull. Inst. R. Soc. Nat. Belg. 38:1–71.Google Scholar
Greenwald, L., Ward, P., and Greenwald, O. 1980. Cameral liquid transport and buoyancy control in the chambered Nautilus (Nautilus macromphalus). Nature. 286:55–56.CrossRefGoogle Scholar
Hamada, T. 1964. Notes on drifted Nautilus in Thailand. Sci. Papers. Coll. Gen. Educ., Univ. Tokyo. 14:255–278.Google Scholar
Heptonstall, B. 1970. Buoyancy control in ammonoids. Lethaia. 3:317–328.CrossRefGoogle Scholar
Kahn, P. and Pompea, S. 1978. Nautiloid growth rhythms and dynamical evolution of the Earth-Moon system. Nature. 275:606–611.CrossRefGoogle Scholar
Kanie, Y., Mikami, S., Yamada, T., Hirano, H., and Hamada, T. 1979. Shell growth of Nautilus macromphalus in captivity. Venus, Jpn. J. Malacol. 38:129–134.Google Scholar
Martin, A. W., Catala-Stucki, I., and Ward, P. D. 1978. The growth rate and reproductive behavior of Nautilus macromphalus. N. Jb. Geol. Paläontol. Abh. 156:207–225.Google Scholar
Mutvei, H. 1972. Ultrastructural studies on cephalopod shells. Bull. Geol. Instr. Univ. Upsala N.S. 3. 8:237–261.Google Scholar
Saunders, W. and Ward, P. 1979. Nautiloid growth and lunar dynamics. Lethaia. 12:172.CrossRefGoogle Scholar
Simpson, G. 1953. The Major Features of Evolution. 364 pp. Columbia Univ. Press; N.Y.CrossRefGoogle Scholar
Ward, P. 1979. Cameral liquid in Nautilus and ammonites. Paleobiology. 5:40–49.CrossRefGoogle Scholar
Ward, P. and Martin, W. 1978. On the buoyancy of the pearly Nautilus. J. Exp. Zool. 205:5–12.CrossRefGoogle Scholar
Ward, P. and Martin, A. 1980. Depth distributions of Nautilus pompilius in Fiji and Nautilus macromphalus in New Caledonia. Veliger. 22:259–264.Google Scholar
Ward, P., Stone, R., Westermann, G., and Martin, A. 1977. Notes on animal weight, cameral fluids, swimming speed, and color polymorphism of the cephalopod Nautilus pompilius in the Fiji Islands. Paleobiology. 3:377–388.CrossRefGoogle Scholar
Ward, P., Greenwald, L., and Greenwald, O. 1980. The buoyancy of the chambered Nautilus. Sci. Am. 243:190–203.CrossRefGoogle Scholar
Wells, M. 1978. Octopus: Physiology and Behaviour of an Advanced Invertebrate. 417 pp. Chapman and Hall; London.CrossRefGoogle Scholar
Willey, A. 1902. Contributions to the natural history of the pearly Nautilus: A. Willey's zoological results. 6:691–830. Cambridge Univ. Press; London.Google Scholar
Yochelson, E., Flower, R., and Webers, G. 1973. The bearing of the new Late Cambrian monoplacophoran genus Knightoconus on the origin of the Cephalopoda. Lethaia. 6:275–310.CrossRefGoogle Scholar