Vol. 60, 2021
(update: 2021.01.27; 03.18)
A Different Perspective on Sex
Dimorphism in the Adult Hermann’s Tortoise: Geometric Morphometry
Sokol
Duro1 , Ozan Gündemir2,* , Bektaş Sönmez3 ,
Tefik Jashari4 , Tomasz Szara5 , Gülsün Pazvant2 ,
and Arben Kambo6
doi:10.6620/ZS.2021.60-09
1Faculty
of Veterinary Medicine, Agricultural University of Tirana, Tirana,
1000, Albania. E-mail: durosokol@yahoo.com (Duro)
2Department
of Anatomy, Faculty of Veterinary Medicine, Istanbul
University-Cerrahpasa, Istanbul, 34500, Turkey. *Correspondence:
E-mail: ozan.gundemir@istanbul.edu.tr (Gündemir).
E-mail: gulsun@istanbul.edu.tr (Pazvant)
3Suşehri Timur Karabal Vocational Training School,
Cumhuriyet University, Sivas, 58600, Turkey. E-mail: bektass@gmail.com
(Sönmez)
4Institute of Graduate Studies, Istanbul
University-Cerrahpasa, Istanbul, 34500, Turkey. E-mail:
tefikjashari13@gmail.com (Jashari)
5Department of Morphological Sciences, Faculty of
Veterinary Medicine, Warsaw University of Life Science Warsaw, 02-776,
Poland. E-mail: Tomasz_szara@sggw.pl (Szara)
6Department of Economy and Rural Development Policies,
Faculty of Economy and Agribusiness, Agriculture University of Tirana,
Tirana, 1000, Albania. E-mail: akambo@ubt.edu.al (Kambo)
Received 5 May 2020 / Accepted 20
January 2021
Communicated by Benny K.K. Chan
Eastern Hermann’s tortoise (Testudo hermanni boettgeri) is a subspecies of Hermann’s tortoise (Testudo hermanni)
found in Albania. Gender determination is one of the crucial elements
in determining the population dynamics in all species. Female and male
adult tortoises look different, but these differences can be difficult
to distinguish in captivity or when their sex indicators are deformed
or injured. Therefore,
the aim of this study was to use indirect and non-invasive methods such
as geometric morphometric analysis to determine the sex of adult
tortoises. For the geometric morphometry, 17 female and 23 male
Hermann’s tortoises were collected and photographed from the hills and
mountains around the Tirana district of Albania between August and
October 2019. Sexes were discriminated based on geometric morphometry,
and plastron shape was a better indicator than carapace shape. In
addition, abdominal, femoral and anal scutes on the plastron and the
ratio of femoral to pectoral suture lengths were important for the sex
distinction. Females had a larger plastron than males; this may have
been supported by fecundity selection, because a large plastron
suggests more volume in which to store eggs. The femoral and anal
scutes were larger in male tortoises, and serve as a stronger base
during mating. This study was conducted for adults only, and future
studies are needed to determine if these indicators also apply to
hatchlings and juveniles.
Key words: Testudo hermanni boettgeri, Sex
discriminate, Geometric morphometry, Abdominal scutes, Albania.
Citation:
Duro S, Gündemir O, Sönmez B, Jashari T, Szara T, Pazvant G, Kambo A.
2021. A different perspective on sex dimorphism in the adult Hermann’s
tortoise: geometric morphometry. Zool Stud 60:9. doi:10.6620/ZS.2021.60-09.

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