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Structural and Functional Characterization of the Tongue and Digestive Tract of Psammophis sibilans (Squamata, Lamprophiidae): Adaptive Strategies for Foraging and Feeding Behaviors

Part of: Micrographia Collection

Published online by Cambridge University Press:  12 May 2020

Ahmed A. El-Mansi Open the ORCID record for Ahmed A. El-Mansi [Opens in a new window] ,
Mohamed A. Al-Kahtani ,
Mohamed M. A. Abumandour  and
Ahmed E. Ahmed
Ahmed A. El-Mansi*
Affiliation:
Biology Department, Faculty of Science, King Khalid University, P.O. Box 641, Abha61421, Saudi Arabia Zoology Department, Faculty of Science, Mansoura University, Mansoura, Egypt
Mohamed A. Al-Kahtani
Affiliation:
Biology Department, Faculty of Science, King Khalid University, P.O. Box 641, Abha61421, Saudi Arabia
Mohamed M. A. Abumandour
Affiliation:
Anatomy and Embryology Department, Faculty of Veterinary Medicine, Alexandria University, Behera, Egypt
Ahmed E. Ahmed
Affiliation:
Biology Department, Faculty of Science, King Khalid University, P.O. Box 641, Abha61421, Saudi Arabia Department of Theriogenology, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt
*
*Author for correspondence: Ahmed El-Mansi, E-mail: aelmansi@kku.edu.sa, elmansi@mans.edu.eg
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Abstract

We describe the morphological adaptations of the tongue and gastrointestinal tract of the striped sand snake Psammophis sibilans and discuss their functional importance. Using standard histological, histochemical, and scanning electron microscopy techniques, we analyzed 11 adult snakes of both sexes. Our findings showed that the bifurcated non-papillate tongue exhibited chemoreceptive adaptions to squamate foraging behavior. The lingual apex tapered terminally with sensory spines, and the body of the tongue possesses a characteristic central odor–receptor chamber that might serve to trap and retain scent molecules. Furthermore, the intrinsic musculature showed interwoven and well-developed transverse, vertical and longitudinal muscle fibers that control contraction and retraction during probing and flicking. The esophagus displayed highly folded mucosa lined with columnar epithelium with goblet cells. In contrast, the stomach mucosa formed finger-like gastric rugae, encompassing tubular glands with dorsal gastric pits. The intestine is distinct from other vertebrates in lacking the crypts of Lieberkühn in the tunica mucosa and submucosa. The intestine mucosa is mostly arranged in interdigitating villi oriented perpendicular to the luminal surface. We extrapolated subtle variations for both acid and neutral mucopolysaccharides and glycoproteins localization as well as collagen fibers using histochemical analyses. The elaborate histo-morphological and functional adaptation of the tongue and digestive tract plays a pivotal role in foraging and feeding behavior.

Keywords

digestive tracthistochemistryPsammophis sibilansscanning electron microscope (SEM)tongue
Type
Micrographia
Information
Microscopy and Microanalysis , Volume 26 , Issue 3 , June 2020 , pp. 524 - 541
Copyright
Copyright © Microscopy Society of America 2020

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