. The biology of the amphibia. Amphibians. 472 THE BIOLOGY OF THE AMPHIBIA approach of the premaxillary spines. Fertilization is internal, and three sets of glands surround the cloaca of the male. The Ambystomoidea are distinguished from the Salamandroidea by their short prevomers without posterior processes extending over the parasphenoid region. The vertebrae are amphicoelous in the Ambystomidae and opisthocoelous in the Salamandridae and some other Salamandroidea. The skull agrees with that of the Hynobiidae and differs from that of the primitive salamandroids in lacking a frontosquamosal a
. The biology of the amphibia. Amphibians. 472 THE BIOLOGY OF THE AMPHIBIA approach of the premaxillary spines. Fertilization is internal, and three sets of glands surround the cloaca of the male. The Ambystomoidea are distinguished from the Salamandroidea by their short prevomers without posterior processes extending over the parasphenoid region. The vertebrae are amphicoelous in the Ambystomidae and opisthocoelous in the Salamandridae and some other Salamandroidea. The skull agrees with that of the Hynobiidae and differs from that of the primitive salamandroids in lacking a frontosquamosal arch and in retaining, in two genera, the lacrimal. The hyoid is peculiar in possessing a cartilaginous cross-bar between the posterior cornua in a large percentage of the species. The body muscles as far as known are primitive, a. Fig. 148.—Dicamptodon ensatus, a large terrestrial salamander of the west coast of the United States. rectus abdominis superficialis but no rectus abdominis profundus being present. Family 1. Ambystomidae.—The three American genera Ambystoma, Dicamptodon, and Rhyacotriton comprise the family Ambystomidae, which is the only one in the suborder. Ambystoma includes 11 species widely scattered over North America from southern Alaska to Mexico. The species are all much alike in form but differ remarkably in color pattern (Fig. 147). They usually lay their eggs in the water, although the Marbled Salamander, A. opacum, deposits them on land in the fall. The larvae, however, are very similar (see page 51) and, being equipped with broad body and tail fins, are adapted to pond life. Dicamptodon and Rhyacotriton are both western salamanders. The latter is apparently restricted to the Olympic Mountains, Washington, while the former ranges from southern British. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble
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Keywords: ., bookcentury1900, bookpublishernewyorkmcgr, booksubjectamphibians
