Abstract：
:Amphibian skin is rich in mucous glands and poison glands, secreting substances important for gas exchange and playing a fundamental role in chemical defense against predators and microorganisms. In the caecilian Siphonops annulatus (Mikan, 1920) we observed a concentration of enlarged mucous glands in the head region. In the posterior region of the body a similar concentration is made up of enlarged poison glands. These accumulations of glands structurally resemble the macroglands previously reported in anurans and salamanders. The skin glands in these regions are each surrounded by collagen walls forming a honeycomb-like structure. The collagen network in the head region firmly attaches to tiny pits in the bones of the skull. The two extremities of the body produce different secretions, containing exclusive molecules. Considering the fossorial lifestyle of caecilians, it seems evident that the secretions of the head and caudal region serve different functions. The anterior macrogland of mucous glands, rich in mucous/lipid secretion, in conjunction with the funnel-shaped head, may act to lubricate the body and penetrate the soil, thus facilitating locomotion underground. The blunt posterior end bearing an internalized macrogland of poison glands in the dermis may act in chemical defense and/or by blocking invasion of tunnels.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Jared C,Mailho-Fontana PL,Marques-Porto R,Sciani JM,Pimenta DC,Brodie ED Jr,Antoniazzi MMdoi
10.1038/s41598-018-22005-5subject
Has Abstractpub_date
2018-02-23 00:00:00pages
3576issue
1issn
2045-2322pii
10.1038/s41598-018-22005-5journal_volume
8pub_type
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