Effect of the killing method on post-mortem change in length of larvae of Thanatophilus micans (Fabricius, 1794) (Coleoptera: Silphidae) stored in 70% ethanol

Midgley, J. M. and Villet, M.H. (2009) Effect of the killing method on post-mortem change in length of larvae of Thanatophilus micans (Fabricius, 1794) (Coleoptera: Silphidae) stored in 70% ethanol. International Journal of Legal Medicine, 123 (2). pp. 103-108. ISSN 0937-9827

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Abstract

It is recommended that insect larvae collected for forensic purposes should be killed using the same method as was used to create existing models for rate of development. Certain killing methods have been shown to be preferable because they cause less distortion of the specimens, but these are not always practicable in a particular case, and so a method of correcting for effect of killing method is required. Larvae of all instars of Thanatophilus micans (Fabricius 1794) (Coleoptera: Silphidae) were measured and then killed by immersion in ethanol, immersion in hot water or freezing. Samples were re-measured immediately after death, then stored in excess 70% ethanol and re-measured after 1 week and again after 4 weeks. The change in length was significantly different from zero in all samples (t = -9.07022, p < 0.001). An analysis of covariance showed that instar, killing method and storage time all had a significant effect on the change in length. The results showed that T. micans larvae have a great potential for change in length during storage but that the change is not predictable, as the magnitude and sign of the change are variable.

Item Type:Article
Additional Information:The original publication is available at www.springerlink.com
Uncontrolled Keywords:Forensic entomology; Killing method; Silphidae; Storage time; Thanatophilus micans
Subjects:Q Science > QL Zoology > Invertebrates > Insects
Divisions:Faculty > Faculty of Science > Zoology & Entomology
ID Code:1937
Deposited By: Prof Martin Villet
Deposited On:12 Apr 2012 13:02
Last Modified:12 Apr 2012 13:02
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