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(A) Dorsal view. (B) Lateral view. (C) Ventral view. (D) Mouth structure. [1] Gosner stage is a generalized system of describing stages of embryonal and larval development in anurans (frogs and toads). The Gosner system includes 46 numbered stages, from fertilized embryo (stage 1) to the completion of metamorphosis (stage 46).
Over the upper edge of the blastopore, called the dorsal lip, a migration of cells occurs, which derives from the central area of the gray crescent. The process of involution takes place – the dorsal lip turns in upon itself. The moving cells enter the blastocoele. As the blastopore deepens, a new embryonic cavity develops, the primitive gut ...
Dorsal view of a waterfall frog in Far North Queensland, Australia Tadpole. The waterfall frog is large in size, reaching 5.5 cm in length. The dorsal surface is mottled with puck brown. The patterning on the back is similar to its habitat, allowing for effective camouflage against granite.
1.9.3 Ghatixalus magnus (large-sized Ghat tree frog) 1.9.3.1 Ghatixalus asterops (Ghat tree frog) ... Dorsal view. Ventral view. Lateral view. Calling. Front view ...
The lower eyelid is patterned with lines, veins, and dots which give the frog its name. Toes are fully webbed and fingers are almost completely webbed. The tympanum is distinct with the upper quarter cover under a skin fold. [3] Common names for R. dayi include Australian lace-lid, lace-eyed tree frog, and Day's big-eyed treefrog. [1]
The dorsal stripes can be broken up, reduced, or even absent in certain specimens. The white or cream-colored underside or ventral side of the frog typically has dark, scattered flecks. A single white stripe runs along the upper lip, and a heavy dark stripe runs across the eye and along each side from the snout to the leg.
Spencer's burrowing frog is a short, rotund frog with a small head and large eyes. The colour and patterns of the dorsal surface vary greatly. The colour ranges from a dark brown to light grey, with darker blotches. A butterfly shaped, darker patch is often found behind the eyes.
The primitive streak is a structure that forms in the early embryo in amniotes. [1] In amphibians, the equivalent structure is the blastopore. [2] During early embryonic development, the embryonic disc becomes oval shaped, and then pear-shaped with the broad end towards the anterior, and the narrower region projected to the posterior.