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The Cranial Morphology of Crinia georgiana Tschudi (Cystignathidæ, Amphibia).
Author(s) -
Toit C. A. DU
Publication year - 1934
Publication title -
proceedings of the zoological society of london
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0370-2774
DOI - 10.1111/j.1469-7998.1934.tb06226.x
Subject(s) - morphology (biology) , zoology , biology
S ummary .1 The alary forms the lateral support of the entire lateral wall of the apertura externa and vestibulum. 2 The crista subnasalis is absent. 3 The anterior undivided part of the crista intermedia is much bigger than in Rana . 4 The posterior vestibular “Wulst” is absent. 5 The plica obliqua is suspended from the tectum nasi. 6 The infundibulum possesses an extra antero‐ventral extension. 7 A well‐developed recessus sacciformis is present. 8 The cavum medium, being more posteriorly situated than in the European Rana , does not share in the formation of the recessus sacciformis. 9 The ductus nasolacrimal opens into the roof of the horizontal part of the infundibulum. 10 The recessus lateralis attains an enormous size. 11 The plica isthmi is absent. 12 The intermaxillary gland opens into tho buccal cavity by two main ducts only. 13 The septomaxillary consists of an anterior unpaired portion which has two posteriorly‐directed processes. 14 The connective‐tissue between the latter bone and the lamina inferior tends to disappear. 15 The vomer (prevomer) is divided, consisting of an anterior edentulous and a posterior dentigerous portion. 16 The os en ceinture is paired. 17 The foramen for the IVth nerve is situated in front of the foramen opticum. 18 The arteria carotis cerebralis enters the skull through a separate foramen. 19 The foramen perilymphaticum superius does not communicate with the jugular foramen. 20 The fronto‐parietal fontanelle is large. 21 There is only one dorsal fenestra in the chondocranium. 22 The annulus tympanicus is sickle‐shaped. 23 The hyomandibular branch of the trigeminal nerve is ventrally situated to the plectrum. 24 The posterior part of the operculum is weakly perichondrally ossified. 25 The articular region differs from that of Rana . 26 Crinia possesses a bursa angularis oris. 27 The hyale is confluent with the otic capsule.