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RF
Mawsonia was a extinct coelacanth lobe-finned fish that prowled the deep ocean during the Triassic and Cretaceous Periods of North Africa and Brazil,-stock-foto
RF
Mawsonia is an extinct lobe-finned predatory fish that lived in the seas of the Triassic Period.-stock-foto
RF
Mawsonia is an extinct lobe-finned predatory fish that lived in the seas of the Triassic Period.-stock-foto
RF
The Coelacanth fish was thought to be extinct but has found to still be a viable creature living in the world's oceans.-stock-foto
RF
Mawsonia was a extinct coelacanth lobe-finned fish that prowled the deep ocean during the Triassic and Cretaceous Periods of North Africa and Brazil,-stock-foto
RF
Mawsonia was a extinct coelacanth lobe-finned fish that prowled the deep ocean during the Triassic and Cretaceous Periods of North Africa and Brazil,-stock-foto
RF
Mawsonia fish in white background - 3D render-stock-foto
RM
. Chordate morphology. Morphology (Animals); Chordata. scale enclosing canal. Figure 8-40. Lateral-line scales of a perch as seen in surface view. A, and in longitudinal section, B. enamel and dentine do not overlay the old; rather, the old surface is first removed (resorbed) then a new surface applied. This type of replacement is a continual process and scales frequently are in a transitional condition with a part of their surface removed. The primitive cosmoid scale was rhomboidal in shape but without peg and socket. There was some overlapping o 0 o o a a Q o o o oqoo â ^- "â o o o^o a-stock-foto
RM
. Chordate morphology. Morphology (Animals); Chordata. lar bone -- ^ ^ spongy ngy bone ^ V V. ; 1"-; spongy bone lamellar bone vascular canal Figure 8-43. Scale structure in choanate fishes, the cosmoid scale. A, stereodiagram of the ante- rior margin and section of a scale of Poro/ep/s ura/ensis,- B, surface appearance and articulation of scales of Poro/ep/s urolens/s,- C, section of dermal bone of Eus/henopteron,- D, section of scale of Neocerotodus. (A, B, C after Bystrow, 1939 and 1959) branched. They are composed of a fibrous horny material with bone cells in their proximal p-stock-foto
RM
. The chordates. Chordata. 424 Comparative Morphology of Chordates Enamel Dentine Epidermis. Fig. 328. Diagrams illustrating the chief types of fish scales. In all the figures anterior is toward the right. (A) Placoid scales of shark: section perpendicular to surface of skin. (B) Surface view of flat, slightly overlapping rhomboid scales. (B') Part of a section perpendicular to the surface of a cosmoid rhomboid scale, much enlarged. The histologic structure of the cosmin suggests that it is produced by fusion of numerous units, each resembling a placoid spine (but without enamel), com- pactly-stock-foto