Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-14T04:42:45.415Z Has data issue: false hasContentIssue false
  • English
  • Français

Monticules in a Jurassic Cyclostomatous Bryozoan

Published online by Cambridge University Press:  01 May 2009

P. D. Taylor
P. D. Taylor
Affiliation:
Department of Geological SciencesUniversity of DurhamSouth RoadDurham
Get access Rights & Permissions [Opens in a new window]

Summary

Structures similar to the monticules of Palaeozoic trepostomatous Bryozoa which occur in the Jurassic cyclostome Reptomultisparsa incrustans are described. They are interpreted as having a function analogous to that inferred for monticules. A smaller proportion of zooecia open on the monticules than between them, and, of these a higher proportion are occluded.These observations lend support to the theory proposed by Banta, McKinney & Zimmer (1974) that monticules functioned as regions of exhalant current chimneys on the zoarial surfaces of Bryozoa.

Type
Articles
Information
Geological Magazine , Volume 112 , Issue 6 , November 1975 , pp. 601 - 606
Copyright
Copyright © Cambridge University Press 1975

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Anstey, R. L. & Delmet, D. A. 1972. Genetic meaning of zooecial chamber shapes in fossil bryozoans: Fourier analysis. Science 177, 1000–2.CrossRefGoogle ScholarPubMed
Banta, W. C., McKinney, F. K. & Zimmer, R. L. 1974. Bryozoan monticules: excurrent water outlets? Science 185, 783–4.CrossRefGoogle ScholarPubMed
Boardman, R. S. 1971. Mode of growth and functional morphology of autozooids in some Recent and Palaeozoic tubular Bryozoa. Smithson. Conirib. Palaeobiol. 8, 1–51.Google Scholar
Boardman, R. S. & Cheetham, A. H. 1973. Degrees of colony dominance in stenolaemate and gymnolaemate Bryozoa. In Boardman, R. S., Cheetham, A. H. & Oliver, W. A. (Eds): Animal Colonies, pp. 121–218. (Pennsylvania 1973).Google Scholar
Borg, F. 1926. Studies on Recent cyclostomatous Bryozoa. Zool. Bidr. Uppsala. 10, 181–507.Google Scholar
Buge, E. & Fischer, J.-C. 1970. Atractosoecia incrustans (d'Orbigny) (Bryozoa Cyclostomata) espèce bathonienne symbiotique d'un Pagure. Bull. Soc. géol. Fr. 12, 126–33.CrossRefGoogle Scholar
Cook, P. L. 1964. Polyzoa from West Africa. Notes on the genera Hippoporina Neviani, Hippoporella Canu, Cleidochasma Harmer and Hippoporidra Canu and Bassler (Cheilostomata, Ascophora). Bull. Br. Mus. nat. Hist. (Zool). 12, 1–35.Google Scholar
Palmer, T. J. & Hancock, C. D. 1973. Symbiotic relationships between Ectoprocts and Gastropods, and Ectoprocts and Hermit Crabs in the French Jurassic. Palaeontology 16, 563–66.Google Scholar
Ulrich, E. O. 1890. Palaeozoic Bryozoa. Ill. State Geol Surv. Bull 8, 285–688.Google Scholar
Walter, B. 1969. Les Bryozoaires jurassiques en France. Étude systématique. Rapports avec la stratigraphie et la paléoécologie. Doc. Lab. Géol. Fac. Sci. Lyon 35, 1–328.Google Scholar