Craniometric investigation and radiographic anatomy of the Red Fox (Vulpes vulpes) skull

Year 2025, Volume: 10 Issue: 2, 83 - 87, 31.08.2025

Yeşim Aslan Kanmaz , Saime Betül Baygeldi , Sadık Yılmaz

https://doi.org/10.31797/vetbio.1638137

Abstract

Morphometric analyses used for skull measurements are an important tool for determining sexual dimorphism and evaluating taxonomy and morphological structure. In recent years, this has led to the emergence of radiographic imaging methods that are frequently used in addition to traditional measurement techniques and allow the skull to be evaluated with the help of imaging techniques. In this study, it was aimed to measure the various dimensions of the skulls observed on radiographs and measured morphometrically and to present numerical data using the measurements. Four adult male red fox skulls were used in the study. Digital callipers were used for craniometric measurements. Morphometric measurements were based on 18 measurement points. The mean and standard deviation of craniometric measurements were determined. Radiographic images were taken ventrodorsally and laterolaterally and the necessary anatomical parts were marked on the image. The highest value of total length (TL) was 139.22±0.55 mm and the smallest value of height of foramen magnum (HFM) was 13.19±0.02 mm. As a result of the analyses, it was determined that the skulls of red foxes have some similarities with other carnivores as well as some unique anatomical features. This study can be used in different disciplines such as anatomy, morphology and osteoarchaeology in the taxonomic determination of carnivore species and thus may contribute to further studies on the red fox. In addition to morphometric measurements, radiographic imaging of the red fox for the first time is very important in terms of establishing an important data bank for breed identification.

Keywords

Craniometry , Radiography , Skull , Vulpes vulpes

References

• Atasoy, F., Erdoğan, M., Özarslan, B., Yüceer, B., Kocakaya, A., & Akçapınar, H. (2014). Malaklı Karabaş köpeklerde bazı morfolojik ve genetik özellikler. Ankara Üniversitesi Veteriner Fakültesi Dergisi, 61(2), 125-132. https://doi.org/10.1501/Vetfak_0000002616
• Brombini, G. C., Rahal, S. C., Schimming, B. C., Santos, I. F. C., Tsunemi, M. H., Mamprim, M. J., Alves, L. S., Filadelpho, A. L., & Teixeira, C. R. (2018). Radiological and osteological study of the pelvic limbs in free‐ranging capybaras (Hydrochoerus hydrochaeris). Anatomia, Histologia, Embryologia, 47(3), 239-249. 10.1111/ahe.12349
• Brünner, H., Lugon-Moulin, N., Balloux, F., Fumagalli, L., & Hausser, J. (2002). A taxonomical re-evaluation of the Valais chromosome race of the common shrew Sorex araneus (Insectivora: Soricidae). Acta Theriologica, 47, 245-275. 10.1007/BF03194146.
• Chariker, J. H., Naaz, F., & Pani, J. R. (2012). Item difficulty in the evaluation of computer‐based instruction: An example from neuroanatomy. Anatomical Sciences Education, 5(2), 63-75. https://doi.org/10.1002/ase.1260.
• Christiansen, P. (2008). Distinguishing skulls of lions (Panthera leo) and tigers (Panthera tigris). Mammalian Biology, 73(6), 451-456. https://doi.org/10.1016/j.mambio.2007.08.001
• Dobrowolska, Z. M., Moska, M., Mucha, A., Wierzbicki, H., & Dobrowolski, M. (2017). Variation in fur farm and wild populations of the red fox, Vulpes vulpes (Carnivora: Canidae)—Part II: Craniometry. Canadian Journal of Animal Science, 98(1), 84-97. https://doi.org/10.1139/cjas-2017-0015.
• Erdoğan, M., Tepeli, C., Özbeyaz, C., Akbulut, M. D., & Uğuz, C. (2012). Comparison of some morphological characteristics of native Turkish dog breeds. Eurasian Journal of Veterinary Sciences, 28(2), 106-110.
• Erolin, C. (2019). Interactive 3D digital models for anatomy and medical education. Biomedical Visualisation, 2, 1-16. 10.1007/978-3-030-14227-8_1.
• Farhadinia, M. S., Kaboli, M., Karami, M., & Farahmand, H. (2014). Patterns of sexual dimorphism in the Persian Leopard (Panthera pardus saxicolor) and implications for sex differentiation. Zoology in the Middle East, 60(3), 195-207. 10.1080/09397140.2014.939813
• Gündemir, O., Duro, S., Jashari, T., Kahvecioğlu, O., Demircioğlu, İ., & Mehmeti, H. (2020). A study on morphology and morphometric parameters on skull of the Bardhoka autochthonous sheep breed in Kosovo. Anatomia, Histologia, Embryologia, 49(3), 365-371. https://doi.org/10.47748/tjvr.1189675.
• Gürbüz, İ., Demiraslan, Y., Karaavcı, F. A., Yılmaz, O., & Demircioğlu, İ. (2022). Geometric morphometric analysis on the skull of the red fox (Vulpes vulpes). Harran Üniversitesi Veteriner Fakültesi Dergisi, 11(1), 1-7. 10.1111/ahe.12538
• Güzel, B. C., Baygeldi, B., Demircioglu, İ., İlgün, R., & Özkan, Z. E. (2023). Craniometric comparisons of the skull of male and female malaklı dogs usıng 3-dımensıonal ımagıng: a computed tomography (ct) study. JAPS: Journal of Animal & Plant Sciences, 33(4). 10.36899/JAPS.2023.4.0688.
• İlgün, R., & Özkan, Z. E. (2015). Comparative study of some osteometric measurements of the neurocranium and splanchnocranium bones in Aksaray Malaklı and Kangal dogs. Fırat Üniversitesi Sağlık Bilimleri Veteriner Dergisi, 29(3), 157 – 161.
• İlgün, R., Özüdoğru, Z., Karabulut, O., Can, M. (2021). Macroanatomical and morphometric study on the skull bones of Aksaray Malaklı dogs. Folia Morpholojica, 81(1), 157–163. 10.5603/FM.a2021.0011.
• Kaloyianni, O. F. (2022). A craniometric analysis of dogs (Canis familiaris) for the purpose of identifying archeozoological material (Doctoral dissertation, University of Zagreb. Faculty of Veterinary Medicine).
• Karan, M., Aydın, A., Timurkaan, S., & Toprak, B. (2005). Bazı carnivorlarda viscerocranium'un karşılaştırmalı makro-anatomik incelenmesi. Fırat Üniversitesi Sağlık Bilimleri Dergisi, 19(2), 99-102.
• Karan, M., Tımurkaan, S., Özdemir, D., & Ünsaldi, E. (2006). Comparative macroanatomical study of the neurocranium in some carnivora. Anatomia Histologia Embryologia, 35(1), 53-56. https://doi.org/10.1111/j.1439-0264.2005.00659.x.
• Karan, M., & Yılmaz, S. (2015). Yaban domuzlarinda (Sus scrofa) neurocranium'u oluşturan kemiklerin makro‐anatomik olarak incelenmesi. Fırat Üniversitesi Sağlık Bilimleri Dergisi, 29, 191-193.
• Karan, M., & Yılmaz, S. (2016). Yaban domuzlarında (Sus scrofa) viscerocranium'u oluşturan kemiklerin makro-anatomik olarak incelenmesi. Fırat Üniversitesi Sağlık Bilimleri Veteriner Dergisi, 30(1), 1-4.
• Karimi, I., Onar, V., Pazvant, G., Hadipour, M., & Mazaheri, Y. (2011). The cranial morphometric and morphologic characteristics of Mehraban sheep in Western Iran. Global Veterinaria, 6(2), 111-117.
• Khosravi, R., Kaboli, M., Imani, J., & Nourani, E. (2012). Morphometric variations of the skull in the Gray Wolf (Canis lupus) in Iran. Acta Theriologica, 57, 361-369.
• Kistner, T. M., Zink, K. D., Worthington, S., & Lieberman, D. E. (2021). Geometric morphometric investigation of craniofacial morphological change in domesticated silver foxes. Scientific Reports, 11(1), 2582. https://doi.org/10.1038/s41598-021-82111-9.
• Kruuk H. (2002). Hunter and hunted. relationships between carnivores and people (2nd ed.). UK: Cambridge University Press.
• Munkhzul, T., Reading, R. P., Buuveibaatar, B., & Murdoch, J. D. (2018). Comparative craniometric measurements of two sympatric species of Vulpes in Ikh Nart Nature Reserve, Mongolia. Mongolian Journal of Biological Sciences, 16(1), 19-28. 10.22353/mjbs.2018.16.03
• Onar, V., Belli, O., & Owen, P. R. (2005). Exámen morfometrico del zorro rojo (Vulpes vulpes) de la necropolis de Van-Yoncatep en Anatolia del este. International Journal of Morphology, 23(3), 253-260. 10.4067/S0717-95022005000300011.
• Onar, V., Kahvecioglu, K. O., & Çebi, V. (2002). Computed tomographic analysis of the cranial cavity and neurocranium in the German shepherd dog (Alsatian) puppies. Veterinarski Arhiv, 72(2), 57-66.
• Parsons, K. J., Rigg, A., Conith, A. J., Kitchener, A. C., Harris, S., & Zhu, H. (2020). Skull morphology diverges between urban and rural populations of red foxes mirroring patterns of domestication and macroevolution. Proceedings of the Royal Society B, 287(1928), 20200763.
• Pitakarnnop, T., Buddhachat, K., Euppayo, T., Kriangwanich, W., & Nganvongpanit, K. (2017). Feline (Felis catus) skull and pelvic morphology and morphometry: Gender‐related difference? Anatomia Histologia Embryologia, 46(3), 294-303.
• Saber, A. S. M., Cacec, T., Gummow, B., & Johns, K. (2016). Morphometric studies on the skull of the Australian domestic cat (F. catus) and its clinical implications for regional anesthesia. Journal of Veterinary Anatomy, 9(1), 1-24.
• Shukla, B. B., Kumar, R., Upadhyay, A. K., Shukla, S. K., Dixit, V. P., & Kumar, M. (2003). Relationship of age with body weight in orphaned leopard cubs. Zoos'prınt Journal, 18(3), 1058-1058.
• Tamlin, A. L., Bowman, J., & Hackett, D. F. (2009). Separating wild from domestic American mink Neovison vison based on skull morphometries. Wildlife Biology, 15(3), 266-277.
• Tejavathi Nagaraj, L. J., Gogula, S., Ghouse, N., Nigam, H., & Sumana, C. K. (2017). Sex determination by using mandibular ramus: A digital radiographic study. Journal of Medicine, Radiology, Pathology and Surgery, 4, 5-8.
• Travaini, A., Juste, J., Novaro, A. J., & Capurro, A. F. (2000). Sexual dimorphism and sex identification in the South American culpeo fox, Pseudalopex culpaeus (Carnivora: Canidae). Wildlife Research, 27(6), 669-674.
• Urosevic, M., Matejević, M., Drobnjak, D., & Ozkanal, U. (2021). Phenotype variability and basic morphological characteristics of the Aksaray Malaklı dog population in Turkey. Veterinarska Stanica, 52(6), 703-710.
• Uzuner, M. B., Geneci, F., Ocak, M., Bayram, P., Sancak, İ. T., Dolgun, A., & Sargon, M. F. (2016). Sex determination from the radiographic measurements of calcaneus. Anatomy, 10(3), 200-204.
• Von Den Driesch, A. (1976). A guide to the measurement of animal bones from archaeological sites (1st ed). Peabody museum press.
• Wilson, D. E., & Reeder, D. M. (Eds.). (2005). Mammal species of the world: a taxonomic and geographic reference (1st ed). JHU press.
• Yalçın, H., & Kaya, M. A. (2010). Comparative geometrical morphometry on the skull bones of Anatolian wild sheep and Akkaraman sheep. Kafkas Üniversitesi Veteriner Fakültesi Dergisi,16 (1), 55-61.
• Yilmaz, O., Koca, D., Sahin, M. E., & Avcilar, T. (2024). Sex determination in budgerigars using radiographic pelvimetry. Veterinary Medicine and Science, 10(1), e1340. 10.1002/vms3.1340.