Morphological Evidence for an Oral Venom System in Caecilian Amphibians.
Biological Sciences
Evolutionary Biology
Zoology
Journal
iScience
ISSN: 2589-0042
Titre abrégé: iScience
Pays: United States
ID NLM: 101724038
Informations de publication
Date de publication:
24 Jul 2020
24 Jul 2020
Historique:
received:
30
03
2020
revised:
25
05
2020
accepted:
29
05
2020
pubmed:
6
7
2020
medline:
6
7
2020
entrez:
5
7
2020
Statut:
ppublish
Résumé
Amphibians are known for their skin rich in glands containing toxins employed in passive chemical defense against predators, different from, for example, snakes that have active chemical defense, injecting their venom into the prey. Caecilians (Amphibia, Gymnophiona) are snake-shaped animals with fossorial habits, considered one of the least known vertebrate groups. We show here that amphibian caecilians, including species from the basal groups, besides having cutaneous poisonous glands as other amphibians do, possess specific glands at the base of the teeth that produce enzymes commonly found in venoms. Our analysis of the origin of these glands shows that they originate from the same tissue that gives rise to teeth, similar to the venom glands in reptiles. We speculate that caecilians might have independently developed mechanisms of production and injection of toxins early in their evolutionary history.
Identifiants
pubmed: 32621800
pii: S2589-0042(20)30419-3
doi: 10.1016/j.isci.2020.101234
pmc: PMC7385905
pii:
doi:
Types de publication
Journal Article
Langues
eng
Pagination
101234Informations de copyright
Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.
Déclaration de conflit d'intérêts
Declaration of Interests The authors declare no competing interests.
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