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The moose throat bot fly Cephenemyia ulrichii larvae not found developing in roe deer
Acta Veterinaria Scandinavica volume 64, Article number: 43 (2022)
In 2008, we published a report on Cephenemyia ulrichii, the moose (Alces alces) throat bot in roe deer (Capreolus capreolus) . The identification was based on morphology of two 3rd instar larvae of around 50 seen in a spring hunted roe deer buck shot in Kirkkonummi, Finland. The morphological characteristics utilized in species identification as C. ulrichii were especially spines irregularly placed on the anterior dorsal side, while those of C. stimulator and C. trompe are in regular rows similar to those on the ventral surfaces. The only deviation we could find from the previously published characteristics  was the smaller size, about 26–27 mm long, while those of C. ulrichii typically reach a length of 40 mm.
Because there have been a number of reports of throat bots from roe deer in Finland in the last few years, and some of them have genetically been positively identified as C. stimulator (unpublished), we took the remaining (third) larva from the original sample and performed limited morphological analysis, which showed the morphology was consistent with the other two larvae previously identified as C. ulrichii with irregularly located spines on the anterior dorsal side (Fig. 1). In addition, we performed PCR and subsequent sequencing of the CO1 gene, which unequivocally proved the larva to be C. stimulator, not C. ulrichii.
The discrepancy between morphological and genetic diagnoses shows that morphological characteristics of Cephenemyia spp. 3rd instar larvae are not unambiguous. Fortunately, genetic analyses are easily performed now, unlike just 15 years ago.
To our knowledge, no further reports on C. ulrichii in roe deer have been published since our initial, hereby cancelled, one in 2008. We then concluded: “Generally, all Cephenemyia species are very host specific and thereby also well adapted to their hosts”. This is even truer than we then had reason to believe.
Cephenemyia stimulator has since been documented in Skåne, Southern Sweden, in 2012 .
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Molander M. Rådjurets nässtyng Cephenemyia stimulator (Diptera: Oestridae) påträffat i Skåne: En ny plåga för de svenska rådjuren a first Swedish record of the roe deer botfly Cephenemyia stimulator (Diptera: Oestridae). Entomologisk Tidskrift. 2013;134:69–75 (ISSN 0013-886x).
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Heikkinen, P., Isomursu, M. & Oksanen, A. The moose throat bot fly Cephenemyia ulrichii larvae not found developing in roe deer. Acta Vet Scand 64, 43 (2022). https://doi.org/10.1186/s13028-022-00663-w