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Query: classification: "42.82"

AuthorsP.G. de Almeida, F.A. Felsemburgh, R.A. Azevedo, L. de Brito-Gitirana
TitleMorphological re-evaluation of the parotoid glands of Bufo ictericus (Amphibia, Anura, Bufonidae)
JournalContributions to Zoology
Keywordsmorphology; amphibian integument; exocrine glands; bufonid
AbstractMulticellular glands in the amphibian integument represent a signifi
cant evolutionary advance over those of fi shes. Bufonids have parotoid glands, symmetrically disposed in a post-orbital position.
Their secretion may contribute to protection against predators
and parasites. This study provides a re-evaluation of the morphology
of the Bufo ictericus parotoid glands. The parotoid gland
integument of the medial surface shows rounded depressions
with small pores that connect with the duct openings of the larger
granular glands. Under light microscopic evaluation the integument
is constituted by typical epidermis, supported by dermis
subdivided into a spongious dermis, a reticular dermis, and a
compact dermis. The Eberth-Katschenko layer is identifi ed as a
basophilic material scattered throughout the superfi cial spongious
dermis. The parotoid gland is an integument region, in which
three exocrine glandular types occur: mixed glands, smaller
granular glands and larger granular glands. The mixed gland is
formed by mucous and serous cells while the small granular
glands contain a homogene acidophilic intake. The larger granular
glands produce a basophilic and alcianophilic material, and
are responsible for the macroscopic protuberances designed as
parotoid glands. Thus, the end product released by the parotoid
glands is a mix of secretions produced by the three glands.
Classification42.82 ; 42.62
Document typearticle
Download paperpdf document http://www.repository.naturalis.nl/document/54519