STAGING OF AMPHIBIAN EMBRYOS 



91 



THE NORMAL STAGES IN THE DEVELOPMENT OF THE 

 SOUTH AFRICAN CLAWED TOAD, XENOPUS LAEVIS 



STAGE NUMBER 



AGE-HOUfiS, IB'C 



Cf5 



OWT CMCSCCNT 



tMI.T Cl.t<v«OI 



STAGE NUMBER 



AGE-HOURS, tS'C 



105 



M<o-ci.c*HAec 



e»«>.T oAM«A.* 



M'D ' atiTnuia 



o 



.arc oMTMuut 



NCuMk PL'TC 



STAGE NUMBER 



AGE-MOURS, I8*C 



NCUML *OLD 



m 



uaat. Twat 



STAGE NUMBER 



20 



AGE IN HOURS AT IB* C 



39 



72 



LENGTH IN MILLIMETERS 



55 



HUSCUL** nci'OHSt 



^•i^ ■ '^ '■'"''2^^0^n if " . ,■ f 



H*TCH<n« 



STAGE NUMBER 



AGE IN HOURS AT IS' C 



LENGTH IN MILLIMETERS 



I >C ? 



23 910 



30 



rintT-vonit taopoli 



• CCONO-roKM TADPOLC 



TMlND-rOKM TADPOLE 



Drawings : Courtesy 

 Dr. Paul Welez 

 I9I+5: Anat. Bee. 95 



Dorsal, lateral and ventral views of a 

 35 mm. larva of Xenopus laevls. 



Photo: Courtesy 

 Dr. Paul Welsz 

 I9I15: Jour. Morph. 77 



