Early development of chondrocranium in the tailed frog Ascaphus truei (Amphibia: Anura): implications for anuran palatoquadrate homologies

Journal of Morphology
J O Reiss

Abstract

Chondrocranial development in Ascaphus truei was studied by serial sectioning and graphical reconstruction. Nine stages (21-29; 9-18 mm TL) were examined. Mesodermal cells were distinguished from ectomesenchymal (neural crest derived) cells by retained yolk granules. Ectomesenchymal parts of the chondrocranium include the suprarostrals, pila preoptica, anterior trabecula, and palatoquadrate. Mesodermal parts of the chondrocranium include the orbital cartilage, posterior trabecula, parachordal, basiotic lamina, and otic capsule. Development of the palatoquadrate is as follows. The pterygoid process first connects with the trabecula far rostrally; their fusion progresses caudally. The ascending process connects with a mesodermal bar that extends from the orbital cartilage to the otic capsule, and forms the ventral border of the dorsal trigeminal outlet. This bar is the "ascending process" of Ascaphus adults; it is a neurocranial, not palatoquadrate structure. The basal process chondrifies in an ectomesenchymal strand running from the quadrate keel to the postpalatine commissure. Later, the postpalatine commissure and basal process extend anteromedially to contact the floor of the anterior cupula of the otic capsule, creating sepa...Continue Reading

References

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Citations

Dec 5, 1998·Journal of Morphology·J O Reiss
Sep 1, 1997·Journal of Morphology·L Analía Púgener, A M Maglia
Jun 20, 2003·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Michele Miller BeverDonna M Fekete
Sep 17, 2008·Nature·Vladimír SoukupRobert Cerny
Aug 24, 2010·Journal of Morphology·Karel KrálovecVladimíra Muzáková
Mar 31, 2006·Journal of Morphology·Barbara Banbury, Anne M Maglia
Sep 22, 2011·Journal of Morphology·Noëlle A Benzekri, John O Reiss
May 10, 2020·Journal of Morphology·Paul Lukas, Lennart Olsson
May 14, 1999·Journal of Morphology·R O De Sá, C C Swart
Mar 14, 2003·Journal of Morphology·Ben D Bell, Richard J Wassersug
Jul 19, 2012·Journal of Anatomy·Vladimír SoukupRobert Cerny

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