Comparative histological characterization of the tongue in two reptiles; Scincus scincus (Scincidae) and Uromastyx ornata (Agamidae) in relation to diet

Abstract

S i h a m B a yo u mi S a l e m Do n a l d B . Mi l e s A b e e r A b d -E l h a me e d A l m -E l d e e n Ra m a d a n M a h m o u d K a n d ye lComparative histological characterization of the tongue in two reptiles, Scincus scincus (Scincidae) and Uromastyx ornata (Agamidae) in relation to diet ABSTRACT:The present study is designed to investigate the morphological and histological characterization of the tongue in two reptilian species; S. scincus (Insectivorous) and U. ornata (Herbivorous). Moreover, to reveal the histochemical features of the lingual glands and connective tissue fibres. Five adult reptiles of each species were used, they were collected from Abo-Rawash, Egypt. Different histochemical methods were used to detect the nature of the lingual gland secretions and their relationship with the feeding habits. Morphologically, in both species, the tongue is somewhat triangle with three distinguishable areas; apex, body, and root. The notched tip is more obvious in U. ornata. Different shapes of papillae are distributed over the dorsal lingual surfaces and being more abundant in U. ornata. Both serous and mucous secretory acini are noticed in the tongue of U. ornate, however, in S. scincus only mucous acini are found. The secretory acini showed a clear affinity toward all stain types according to the acid and neutral mucin. The amount and distribution of collagen fibres are comparatively more in the tongue of U. ornata. Elastic fibres are not detected in the two-examined species. The results showed a marked variation in lingual papi llae, lingual gland secretions, and in the distribution of collagen fibres in the two -examined species as a reflection of their diet. KEY WORDS:Lingual papillae, Lingual glands, Taste buds, Collagen fibres, Herbivorous CORRESPONDENCE:S i h a m B a yo u mi S a l e m Zoology Department, Faculty of Science, Tanta University, Egypt.

Histological and ultrastructural characterization of the dorso-ventral skin of the juvenile and the adult starry puffer fish (Arothron stellatus, Anonymous 1798)

“…Histomorphometric measurements of the layers of the dorso-ventral skin of the juvenile and adult starry puffer fish were acquired using Image J software ( http://Fiji.sc/Fiji ) [ 45 ].…”

Etude biométrique du Scinque officinal ou « poisson de sable » Scincus scincus (Linnaeus, 1758) : analyse du dimorphisme sexuel de la sous-espèce S. s. scincus (Linnaeus, 1758) de la région d'El Oued Souf (Algérie)

“…Il disparaît sous le sable rapidement (moins d'une seconde) en cas de danger et progresse par des ondulations du corps (Arnold & Leviton, 1977) qui lui ont valu son nom de poisson de sable. Il a fait l'objet d'études anatomo-fonctionnelles (Russel & Bels, 2001 ;Baumgartner et al, 2008 ;El-Bakry et al, 2012 ;Sharpe et al, 2013 ;Stadler et al, 2016 ;Wu et al, 2018 ;Gadel-Rab et al, 2018), en lien avec sa locomotion originale et sa progression sous le sable, ainsi que récemment d'études sur sa valeur nutritionnelle, comme source de protéines animales (Salem et al, 2017 ;Toumi et al, 2017). Le Scinque a été à l'origine d'études anatomiques ou histologiques (Hetherington, 1989 ;El-Bakry et al, 2012 ;Salem et al, 2017 ;Abo-Eleneen et al, 2014), mais à ce jour, aucun travail sur la biométrie ou sur le dimorphisme sexuel de cette espèce n'a été publié.…”

Comparative histological and ultrastructural features of the tongue of the mallard domestic duck, Anas platyrhynchos f. domestica, Anatidae (Linnaeus, 1758) in different two age stages (post‐hatching [P2] and adult female) captured from Egypt

“…The tongue is a muscular organ found in the oral cavity, and it has three defined regions: the apex, body, and root. Each region has a different functional and histological structure (Abbate et al, 2008;Cizek et al, 2017Cizek et al, , 2019Dehkordi et al, 2010;Jackowiak & Godynicki, 2005;Salem et al, 2017). The lingual papillae on the tongue exhibit adaptations based on the feeding mechanism (Abumandour, 2014).…”