180 



ANDKOGENESIS 



Fertilization of the egg and the removal of the female nucleus (androgenesls) in 

 Trlturus vlrldescens. 



P^C' I DnmBg of id tgg ki 

 ■howinf two dark ipiinn marki 

 in its trairt tba MroDd malDril 



Iti upaul* about 12 miautM altn dapMiUOB, 

 nd th* lifbll.T pifDi«ttl«it poUr ara* conUIDlnt 

 on (pindk, markn) b; a small plgai(int*d apal. 



PifC- i Andra^Dftic cmbrjo 7 daii old (b), lbs diploid coalrol of lb« mem ttft 

 an<l from the Mmf female (f), and a joxmgrr diploid Fmbr^o (a), of aboot 

 the mkotr (tag* of [tPTrlopmfnt a* lb* mitirngtartit cmbrio. Tht head and ejt 

 (raiflra of tbr andro^niellt nobrjo an imaller than (boa* of dtbei on* «f tbc 

 two diploid rmbrjro*. 



Androgenetlc embryos o\f Trlturus vlrldescens compared with control and younger diploid 

 embryos. 



t*lf. 2 DIaftM) of IW r^pMI*, Modlc. and an «|g tn poaltioti fat puDrturlBC. 



Plf . 4 AndKCroetic larra IS data old (a), ih« diploid «>nlrol of tka auw 

 ago (e), and jmiagrr diploid larra (hi, of about Ih* aamr alaff of JoTvlopmMt 

 and from Ih* aamr frmalp a* th« andrograrlic Urra. Tbr dlfffrvncro In the aia* 

 af Ibo irllb aa *rll a* Ihr miw of the flKmtnl rrlU of thr Kaploid lad Ibe two 

 diploid larva* arc tvr; notinabk- Tba banloid larta u «]» ibortrf than bolb 

 diploid lartar. 



Fig. 1. Drawing of an egg In Its capsule about 

 dark sperm marks and the lightly plgmen 

 the second maturation spindle, marked b 



Fig. 2. Diagram of the pipette, needle, and an 



Fig. 3. Androgenetlc embryo 7 days old (b) , the 

 the same female (c) , and a younger dlpl 

 development as the androgenetlc embryo. 

 genetic embryo are smaller than those o 



Fig. 4. Androgenetlc larva 12 days old (a) , the 

 and younger diploid larva (b) , of about 

 the same female as the androgenetlc lar 

 gills as well as the size of the plgmen 

 lold larvae are very noticeable. The h 

 diploid larvae. 



12 minutes after deposition, showing two 

 ted polar area containing In Its center 

 y a small pigmented spot. 



egg In position for puncturing. 



diploid control of the seune age and from 

 old embryo (a) , of about the same stage of 



The head and eye vesicles of the andro- 

 f either one of the two diploid embryos. 



diploid control of the same age of (c) , 

 the same stage of development and from 

 va. The differences In the size of the 

 t cells of the haploid and the two dip- 

 aplold larva l6 also shorter than both 



(Kaylor, 195?: Jour. Exp. Zool. 76:375) 



