Related Experiment Video
Updated: Jan 8, 2026
04:28
Eyestalk Ablation to Increase Ovarian Maturation in Mud Crabs
Published on: March 31, 2023
2.5K
Gonadal development in scorpion mud-turtles, Kinosternon scorpioides, in a controlled environment
Brenda Braga1, Verônica Oliveira-Bahia2, Maria Auxiliadora Ferreira2
1Animal Science Graduate Program, Federal University of Pará, Castanhal, Pará, Brazil.
Anatomical Record (Hoboken, N.J. : 2007)
|December 24, 2025
Summary
This study details scorpion mud-turtle (Kinosternon scorpioides) gonadal development, identifying stage 20 as the point of sexual differentiation. Understanding this is key for reptile conservation and managing sex ratios in turtle populations.
Area of Science:
- Herpetology
- Developmental Biology
- Reproductive Biology
Background:
- Gonadal development and sexual differentiation are critical for understanding reptile population dynamics and long-term viability.
- Chelonian sex determination is often temperature-dependent, making studies on gonadal development crucial for conservation efforts.
- The scorpion mud-turtle (Kinosternon scorpioides) is a chelonian species whose reproductive biology requires further characterization.
Purpose of the Study:
- To characterize the gonadal development and identify the stage of sexual differentiation in the scorpion mud-turtle (Kinosternon scorpioides).
- To provide foundational data for understanding the environmental influences on sex determination in this species.
- To support reproductive management and conservation strategies for K. scorpioides populations.
Main Methods:
- Analysis of 85 K. scorpioides embryos from stages 12-26 under controlled incubation temperatures (28.5°C).
- Histological examination using light and transmission electron microscopy to observe gonadal structures.
- Dissection of the reproductive system to identify key developmental stages and cellular components.
Main Results:
- Primordial germ cells (PGCs) were observed in gonadal ridges from stage 12.
- Undifferentiated gonads formed cord-like structures by stage 14.
- Sexual differentiation was evident by stage 20, with distinct ovarian and testicular structures identified.
- Ovaries exhibited cortical and medullary regions, while testes showed seminiferous tubules and connective tissue.
Conclusions:
- Sexual differentiation of gonads in K. scorpioides occurs at stage 20, approximately 50 days of incubation.
- This identification allows for studying environmental impacts, particularly temperature, on sex determination.
- Findings are vital for the reproductive management and conservation of K. scorpioides, including in situ and ex situ population control.
