. Chordate morphology. Morphology (Animals); Chordata. posterior pit line nasal series left medial rostral lateral rostrals premaxillary teeth anterior nasal opening. postparietol suprascapular series posttemporo! organ preoperculars dentosplenial preorticular vertical pit line quadrotojugal dashed lines) angular elements fused to articular Figure 5-8. Dermal bones forming in relationship to the lateral-line sensory organs in a 24-mm larva of Polypterus. (After Pehrson, 1947) observed in Neoceratodus (Figure 5-10). The epihyal is fused with a laterhyal in the course of development. The latero-
. Chordate morphology. Morphology (Animals); Chordata. posterior pit line nasal series left medial rostral lateral rostrals premaxillary teeth anterior nasal opening. postparietol suprascapular series posttemporo! organ preoperculars dentosplenial preorticular vertical pit line quadrotojugal dashed lines) angular elements fused to articular Figure 5-8. Dermal bones forming in relationship to the lateral-line sensory organs in a 24-mm larva of Polypterus. (After Pehrson, 1947) observed in Neoceratodus (Figure 5-10). The epihyal is fused with a laterhyal in the course of development. The latero- hyal extends the epihyal upward, outside the head vein and nerves, to an articulation with the lateral commissure and otic capsule. The lateral commissure probably is derived from the pharyngosuprahyal, although it never has any contact with the hyoid arch and develops as dorsal and ventral processes from the chondrocranium. Pa/aeoniscoid The earliest representatives of the actino- pterygians are called palaeoniscoids. These are, from their first appearance, a diverse assemblage, for the large part only poorly known. The earliest known forms, from the Middle and Upper Devonian, are Cheirolepis, Stegotrachelus, Moythomasia, and Stereolepidella. That the palaeoniscoids were abundant in the Devonian is indicated by scales and bone fragments. procartiloginous lateral wall of otic capsule occipital arch epiphyseal tectum notochord epibranchials I-V. 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 the original Jollie, Malcolm. New York, Reinhold
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