Variations in anuran embryogenesis: yolk-rich embryos of Hyperolius puncticulatus (Hyperoliidae)

Evolution & Development
A D ChipmanO Khaner

Abstract

Anuran development is usually described using model species, most notably Xenopus laevis and Rana pipiens. We describe the development of the East African Reed Frog, Hyperolius puncticulatus, a species displaying development that is highly divergent from the "classic" anuran developmental pattern. Although having small eggs, the eggs of H. puncticulatus are characterized by a large amount of yolk, and embryonic development is reminiscent of species with large eggs. The eggs are teleolecithal and the cleavage is holoblastic, with a "pseudo-meroblastic" pattern. Gastrulation proceeds primarily at the dorsal lip and is characterized by reduced embryonic cavities. Gastrulation ends with a thickened "embryonic mantle" that sits upon a large yolk mass and forms most of the tissues of the embryo. The embryonic axis curves across the yolk mass, instead of the typical lengthening of anuran embryos. The tadpole hatches with a large ventral yolk mass which is gradually absorbed. We hypothesize about the developmental mechanisms that underlie this unusual development, based on comparisons with other anuran and fish species. We suggest that this type of development is not unique to this species, but can be found in many species of different...Continue Reading

Citations

Nov 28, 2007·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·David R Shook, Ray Keller
Jun 5, 2012·Wiley Interdisciplinary Reviews. Developmental Biology·Richard P Elinson, Eugenia M del Pino
Dec 15, 2005·Zoology : Analysis of Complex Systems, ZACS·Richard P Elinson, Yvonne Beckham
Dec 26, 2001·The Journal of Experimental Zoology·A D ChipmanE Tchernov
Apr 17, 2007·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Daniel R BuchholzRichard P Elinson
Jun 28, 2019·PloS One·Jimena GrossoFlorencia Vera Candioti
Jan 6, 2001·The Journal of Experimental Zoology·A D ChipmanO Khaner
Dec 15, 2005·Zoology : Analysis of Complex Systems, ZACS·Ariel D Chipman

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