Aims: This study aimed to examine the
developmental changes in external morphology
characters for some embryonic larval period of
Bufo regularis from River Nile, Assuit, Egypt.
Methods: Our experiment started when tadpoles
began to feed. The adapted embryos were divided
into three large tanks, each with 200 embryos.
Collecting of samples started from feeding age
every three days until end of metamorphosis (the
absorption of tail). External measurements of
the early developmental stages including body
height (BH), body width (BW), eye diameter
(ED), forelimb length (FLL), head-body length
(H-BL), hind limb length (HLL), internarial
distance (IND), interorbital distance (IOD),
nostril diameter (ND), distance between nariel
and orbital (NOD), tail length (TAL), tail height
(TH), total length (TL), tail muscle height (TMH)
and body weight (BWE) were recorded. Results:
The morphological description reported for
each stage indicated many differences between
the different developmental stages. Conclusion:
This study may be considered as morphological
key for the different developmental stages of the
Egyptian toad tadpoles (Bufo regularis).