Journal
MICROSCOPY AND MICROANALYSIS
Volume 27, Issue 5, Pages 1234-1250Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927621012101
Keywords
histology; palate; scanning electron microscope (SEM); Streptopelia decaocto; tongue
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Funding
- Deanship of Scientific Research of King Khalid University [GRP-214-41]
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Our study characterized the morphological and anatomical adaptations of the Eurasian collared dove's lingual microstructures, revealing multiple novel structural variations in the tongue and palate that are adapted for its unique feeding style.
We characterized the morphological and anatomical adaptations of the lingual microstructures of the Eurasian collared dove and discussed their implications for its dietary niche. We analyzed tongues of nine S. decaocto using histological, histochemical, stereomicroscopic, and scanning electron microscopic techniques. Our findings showed that the tongue is relatively short with a tapered apex that carries a terminal lingual nail. However, the lingual body has median scales and is bordered laterally by filiform papillae. Further, the tongue body bears a distinctive papillary crest. The tongue root is nonpapillate and infiltered with orifices of the posterior salivary glands. The bulky laryngeal mound has a circular glottic fissure, carrying a single row of papillae at the rear edge. Concurrently, our histological and histochemical findings demonstrate that the tongue has taste buds, anterior and posterior salivary glands, along with an elongated entoglossum that extends from lingual apex to root. Besides, ovoid and globular mucous glands displayed intense alcianophilic reactions. More substantially, the palate is made up of three palatine ridges with a caudal choanal cleft that was bounded by two rows of palatine papillae. Our data indicate multiple and novel structural variations for the lingual and palatal sculptures coopted for their feeding style.
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