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Necrophagous beetles are underrepresented in forensic entomology studies despite their undeniable utility for the field. In the present article, information is presented regarding the developmental biology and instar determination of  Sciodrepoides watsoni  (Spence, 1813), a very common species occurring across the Holarctic region. Wild collected beetles were kept in climate chambers at constant temperature (12, 15, 18, 21 and 28 °C) and their development was regularly documented. Parameters of thermal summation models and standard errors were calculated for each developmental stage. These models may be used for an estimation of post-mortem interval in legal investigations after further validation on local populations of  S. watsoni . An additional methodology is introduced for future studies of size-based characteristics, addressing instar identification bias. The methodology provided estimations (mean, standard error and standard deviation) of  S. watsoni  larval head capsule width for preliminary larval instar determination. The methodology may be used with other morphological features to improve instar determination accuracy.

peerj

Thermal summation model and instar determination of all developmental stages of necrophagous beetle,<i>Sciodrepoides watsoni</i>(Spence) (Coleoptera: Leiodidae: Cholevinae)

Thermal summation model and instar determination of all developmental stages of necrophagous beetle,Sciodrepoides watsoni(Spence) (Coleoptera: Leiodidae: Cholevinae)