Skip to main content Accessibility help
×
Home

Cuticular microstructure of some Silurian homalonotid trilobites from Sweden

Published online by Cambridge University Press:  20 May 2016

John E. Dalingwater
Affiliation:
50 Westgate, Hale, Cheshire WA15 9AZ, U.K.
Derek J. Siveter
Affiliation:
Geological Collections, University Museum of Natural History, Parks Road, Oxford OX1 3PW, U.K.
Harry Mutvei
Affiliation:
Sektionen för Paleozoologi, Naturhistoriska Riksmuseet, S-10005 Stockholm, Sweden

Abstract

Etched slices of the cuticle of the Silurian trilobite Homalonotus rhinotropis Angelin, 1854, from two localities in Skåne, southern Sweden, have been examined with the scanning electron microscope. The two major subdivisions of the cuticle are a “prismatic” (originally laminated) outer layer, about 20-30 μm thick, and a principal layer, 200-300 μm thick, which may be foliated or roughly laminated. The original finely-laminated aspect of the outer layer may sometimes be seen as a continuous layer, but is more frequently detected as “shaped inclusions” set in a prismatic background. These “shaped inclusions” are considered to have been produced by accumulation of minerals around the apices of 3-6 μm perpendicular canals early in calcification and preferentially preserved because of subtle differences from the products of later stages of the process. It is possible that calcification started before ecdysis. The difficulties involved in ascertaining the original structure of the principal layer are outlined, and possible reasons for differences in its preservation from the outer layer are proposed.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

Access options

Get access to the full version of this content by using one of the access options below.

References

Dalingwater, J. E., and Mutvei, H. 1990. Arthropod exoskeletons, p. 8396. In Carter, J. G. (ed.), Skeletal Biomineralization: Patterns, Processes and Evolutionary Trends, Volume I. Van Nostrand Rheinhold, New York.Google Scholar
Dalingwater, J. E., Hutchinson, S. J., Mutvei, H., and Siveter, D. J. 1991. Cuticular ultrastucture of the trilobite Ellipsocephalus polytomus from the Middle Cambrian of Öland, Sweden. Palaeontology, 34:205217.Google Scholar
Dalingwater, J. E., Hutchinson, S. J., Mutvei, H., and Siveter, D. J. 1993a. Cuticular ultrastructure of some Silurian calymenid trilobites from the Welsh Borderland and Gotland. Palaeontographica, Abteilung A, 229:3749, 10 pl.Google Scholar
Dalingwater, J. E., Hutchinson, S. J., Mutvei, H., and Siveter, D. J. 1993b. Trilobite cuticle calcification, p. 1320. In Kobayashi, I., Mutvei, H., and Sahni, A. (eds.), Structure, Formation and Evolution of Fossil Hard Tissues. Tokai University Press, Tokyo.Google Scholar
Dalingwater, J. E., Hutchinson, S. J., Mutvei, H., and Siveter, D. J. 1996. Mineralization of some homalonotid trilobite cuticles. Bulletin de l'Institut océanographique, Monaco, nombre spécial, 14, 4:343351.Google Scholar
Digby, P. S. B. 1967. Calcification and its mechanism in the shore crab, Carcinus maenus (L.). Proceedings of the Linnaean Society of London, 178:129146.CrossRefGoogle Scholar
McAllister, J. E., and Brand, U. 1989. Primary and diagenetic microstructures in trilobites. Lethaia, 22:101111.CrossRefGoogle Scholar
Mutvei, H. 1974. SEM studies on arthropod exoskeletons, Pt. 1, Decapod crustaceans, Homarus gammarus L. and Carcinus maenas (L.). Bulletin of the Geological Institutions of the University of Uppsala, Ne. Series, 4:7380.Google Scholar
Mutvei, H. 1977. SEM studies on arthropod exoskeletons, Pt. 2, Horseshoe crab Limulus polyphemus (L.) in comparison with extinct eurypterids and Recent scorpions. Zoologic. Scripta, 6:203213.Google Scholar
Teigler, D. J., and Towe, K. M. 1975. Microstructure and composition of the trilobite exoskeleton. Fossils and Strata, 4:137149, 9 pl.Google Scholar
Whittington, H. B. 1993. Morphology, anatomy and habits of the Silurian homalonotid trilobite Trimerus. Memoirs of the Association of Australasian Palaeontologists, 15:6983.Google Scholar

Full text views

Full text views reflects PDF downloads, PDFs sent to Google Drive, Dropbox and Kindle and HTML full text views.

Total number of HTML views: 0
Total number of PDF views: 8 *
View data table for this chart

* Views captured on Cambridge Core between September 2016 - 17th January 2021. This data will be updated every 24 hours.

Hostname: page-component-77fc7d77f9-cdnjt Total loading time: 0.215 Render date: 2021-01-17T22:54:27.290Z Query parameters: { "hasAccess": "0", "openAccess": "0", "isLogged": "0", "lang": "en" } Feature Flags last update: Sun Jan 17 2021 21:55:05 GMT+0000 (Coordinated Universal Time) Feature Flags: { "metrics": true, "metricsAbstractViews": false, "peerReview": true, "crossMark": true, "comments": true, "relatedCommentaries": true, "subject": true, "clr": true, "languageSwitch": true, "figures": false, "newCiteModal": false, "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true }

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Cuticular microstructure of some Silurian homalonotid trilobites from Sweden
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Cuticular microstructure of some Silurian homalonotid trilobites from Sweden
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Cuticular microstructure of some Silurian homalonotid trilobites from Sweden
Available formats
×
×

Reply to: Submit a response


Your details


Conflicting interests

Do you have any conflicting interests? *