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  • 1
    Electronic Resource
    Electronic Resource
    Erectile tissue and smooth muscle in snouts of Carettochelys insculpta, Trionchids and other chelonia (1982)
    Springer
    Zoomorphology 101 (1982), S. 83-93 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Four families of chelonians, the Carettochelyidae, Trionchidae, Pelomedusidae and Chelidae, possess nasal erectile tissue and masses of smooth muscle within the snout. These specialized tissues appear to control the internal diameter of the narial passage. Two of these families, the carettochelids and trionchilds, can change the angle of the tubular snout relative to the head. The trionchids have numerous pharyngeal papillae that function as respiratory surfaces. The angle of the snout and its internal diameter are important to these animals in utilizing the snout to draw clear water into the buccal cavity while buried in the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312016
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  • 2
    Electronic Resource
    Electronic Resource
    Rostral pores in turtles (1974)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 143 (1974), S. 107-119 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Rostral pores are epidermal invaginations which occur on the internarial region of most chelonians. Representatives of all Recent chelonian families and 67 of the 74 extant genera were examined grossly and/or histologically. Pores are absent only in the families Carettochelyidae, Cheloniidae, and Dermochelyidae. The number and microscopic structure of pores vary markedly within and between taxa. Morphological data suggest that rostral pores could function in mechanoreception. The possible origin and evolution of rostral pores are discussed in the context of other chelonian integumentary speializations.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051430105
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  • 3
    Electronic Resource
    Electronic Resource
    The buccopharyngeal mucosa of the turtles (Testudines) (1988)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 196 (1988), S. 33-52 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Gross and histological examination of all extant families of turtles revealed that the buccopharyngeal mucosa is morphologically highly varied. The tongues of aquatic species have small lingual papillae or lack them entirely, while terrestrial species have tongues with numerous glandular papillae. The pharynx and the esophagus also have papillae in some species. These either facilitate swallowing in which case they are long, pointed, keratinized, and occur commonly in marine turtles, or they are vascular and nonkeratinized, facilitate respiratory gas exchange and are found in the Trionychidae, Dermatemyidae, and Carettochelyidae. The morphology of the buccopharyngeal mucosa of turtles reflects their diet, feeding behavior, habitat, and relationships. Convergence in the morphology of the buccopharyngeal mucosa occurs among families, especially among the Emydidae and other familes of turtles. Intergeneric parallelism is also seen within the Emydidae.
    Additional Material: 40 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051960105
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  • 4
    Electronic Resource
    Electronic Resource
    Chelonian mental glands (1975)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 147 (1975), S. 275-291 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A survey of 69 of the 74 currently recognized chelonian genera revealed that 21 genera in three families (Emydidae, Platysternidae and Testudinidae) possess paired integumentary glands or gland vestiges in the anterior throat skin. These glands are here termed mental glands; they are holocrine and may be classified morphologically as follows: Class I mental glands are large, complex, multilobed, have specialized ducts, and are found only in the genus Gopherus: Class II mental glands are small, simple sacklike invaginations containing secretory cells or keratinizing cells. The structure of Class II glands varies from distinctive and saccular to shallow keratinized invaginations having no glandular tissue; they are found only in the families Platysternidae and Emydidae.Mental glands occur in 17 of the 22 genera in the subfamily Batagurinae (sensu McDowell, 64); only 2 of 9 genera in the subfamily Emydinae have these glands. The taxonomic occurrence of mental glands suggests that they are primitive structures. The loss of mental glands in most emydines is interpreted as a subfamilial trend toward integumentary simplification.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051470303
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  • 5
    Electronic Resource
    Electronic Resource
    Integumentary appendages of chelonians (1982)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 172 (1982), S. 59-74 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The head and neck of four families of turtles, the Chelydridae, Kinosternidae, Pelomedusidae, and Chelidae, possess a diverse assemblage of skin appendages. Appendages are termed barbels when they occur in the gular region and tubercles when they occur other places. The appendages consist of protrusions of the dermis and epidermis and are devoid of such specializations as taste buds or neuromasts. They lack skeletal tissue, muscle, or erectile tissue. Methylene blue and silver staining techniques reveal a high density of nerves. The occurrence and morphology of barbels and tubercles suggest that they function as mechanoreceptors. Skin appendages are most elaborate in carnivorous species and reach maximum development in two distantly related convergent species: Macroclemys temmincki (Chelydridae) and Chelus fimbriatus (Chelidae). Skin appendages also help provide camouflage and disruptive effects on the head. The increase in surface area produced by the appendages may be important in aquatic respiratory gas exchange in some species within the Kinosternidae.
    Additional Material: 30 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051720106
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