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Repaired injuries and shell form in some Palaeozoic pleurotomarioid gastropods
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
Uppsala University, Music and Museums, Museum of Evolution. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2005 (English)In: Acta Palaeontologica Polonica, ISSN 0567-7920, E-ISSN 1732-2421, Vol. 50, no 4, 697-704 p.Article in journal (Refereed) Published
Abstract [en]

Pleurotomarioid gastropods typically develop a spiral band called the selenizone in the outer whorl face of the shell that is formed by the closure of an open slit in the apertural margin. The slit and selenizone may be important in controlling the extent to which fractures induced by predatory attacks propagate across the whorl surface. A prominent selenizone can prevent fractures from traversing the entire whorl. Study of six Palaeozoic pleurotomarioid gastropod species with repaired shell injuries shows that repaired injuries are dependent on both the nature of the selenizone and shell form. The species can be divided into three morphological groups (turbiniform, trochiform and planispiral) and show a variety of selenizones with different degrees of prominence. Turbiniform shells show more repaired injuries than planispiral forms, indicating that species in the former group more often survive predatory attacks. The studied material is too sparse for meaningful statistical analysis, but individual case studies suggest that the combined influence of shell form and the nature of the selenizone can make the interpretation complex.

Place, publisher, year, edition, pages
2005. Vol. 50, no 4, 697-704 p.
Keyword [en]
Gastropoda, Pleurotomarioidea, repaired injuries, shell form, selenizone, Palaeozoic
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-93664OAI: oai:DiVA.org:uu-93664DiVA: diva2:167208
Available from: 2005-10-19 Created: 2005-10-19 Last updated: 2013-03-22Bibliographically approved
In thesis
1. Shell repair as a response to attempted predation in some Palaeozoic and younger gastropods
Open this publication in new window or tab >>Shell repair as a response to attempted predation in some Palaeozoic and younger gastropods
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Traces of unsuccessful predatory attacks can be found in the hard parts of shell-bearing organisms as repaired shell injuries and are often preserved in the fossil record. These repaired shell injuries can help to deduce the relationship between predator and prey in the past. Gastropods afford an excellent opportunity for study since their shells are easily recognized from the Cambrian onwards, and usually preserve a full record of their life history. Predation is a phenomenon which has led to a great variety of adaptations among prey organisms in their quest to avoid being eaten. Increased predation pressure seems to have been one of the factors that has fueled the evolution of predation-resistant shell morphologies.

Individual case studies examine the frequency of shell repair in assemblages of Palaeozoic gastropods from different geological periods. The Silurian species Poleumita discors showed a shell repair frequency of 10 %, while only 4 % of the Devonian species Praenatica gregaria have been repaired. The Palaeozoic bilaterally symmetrical bellorphontiform molluscs also showed low levels of shell repair.

Similar shell morphologies in the long-lived group of pleurotomarioid gastropods were examined and shell repair frequenceis calculated to investigate potential variation through geological time. The Palaeozoic species showed repair frequencies of 17.1 % and 4.2 %. The frequency increased in the Mesozoic to between 28.8 % and 46.6 %, while all shells of Recent pleurotomarioids in the study showed repaired injuries. The repaired injuries found do not change in appearance through time, which is probably a reflection of the presence of the slit in the apertural margin. Which type of injury is the most abundant can be seen to change with time, and there is also an increase in size with time. This may be a defensive strategy taken up by the pleurotomarioids as a response to more abundant predators.

Place, publisher, year, edition, pages
Uppsala: Institutionen för geovetenskaper, 2005. 27 p.
Earth sciences, Gastropoda, predation, shell morphology, shell repair, Palaeozoic, Geovetenskap
National Category
Earth and Related Environmental Sciences
urn:nbn:se:uu:diva-6033 (URN)91-506-1829-6 (ISBN)
Public defence
2005-11-25, Lecture Theatre, Palaeontology building, Norbyvägen 22, Uppsala, 10:00
Available from: 2005-10-19 Created: 2005-10-19Bibliographically approved

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