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sex determination in Corucia

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Posted by: Pilirin at Tue Mar 18 06:26:58 2008  [ Report Abuse ] [ Email Message ] [ Show All Posts by Pilirin ]  
   

Leeway Corucia Research Center (LCRC)


Sex determination in Corucia:


Key Words:

probing, behavioral observations, ecdysis method, fecal method, general anatomy sexual dimorphism, C/A biometric ratio, vent scale sexual dimorphism, DNA sexual analysis, Introductions.


Introduction:

Methods of sexual indication of the Scincidae species: Corucia zebrata (underlined) will be discussed here.




Probing:

Probing Corucia zebrata (underlined) has always proven indeterminate. It accomplishes nothing but one having a very angry skink. The jaw strength of these guys is incredible and you want to avoid being bitten at all costs.


Behavioral Observations:

Behavior observations can be a determinate factor although variations do occur. two males will almost (but not always) fight. Males, usually to express dominance, will twitch their tail similar to that of a cat. Females can occasionally attack each other as well.


Ecdysis method:

A gentleman by the name of Justin once suggested using the shedded skin of a known male in an enclosure of a new skink. if the newcomer reacted to the skin in a hostile fashion and engaged in the cat tail twitching posture, it would denote a male. However, in practice, this has proven indeterminate as well.


Fecal Method:

Another attampt in a variation of the ecdysis method is to put feces from one Corucia enclosure to that of another. This is not a wise approach. In addition to upsetting the entire Circulus of the introduced enclosure, A resident circulus skink may get smeared with the foreign poop and get attacked by a resident skink. With this method, hostility could derive from both male and female. In addition, as Sherri has pointed out, This method could spread possible contagion from one enclosure tio another. Even if both Circulus groups in each separate enclosure appear healthy, there may be no resistence to the introduced pathogen in the new enclosure.


General Method Sexual Dimorphism:

Generally males have a 'blockier' head in width and females a narrower , shorter head in appearance. actually, the head size can be similar. It appears different when compared to body width. Females even when not gravid, have a more pear-shaped body in general and the males more straight and streamlined. These differences can be subtle, however.


C/A Biometric Ratio:

A biometric formula ( C/A biometric ratio {Latin: C= Caput (head) A = amplus (width) }) designed at the former South Florida Corucia Research Center in 2001, can give a guide to sex by measuring the width of the head and dividing by the width of the girth of the midsection from the adaxial view.. If the results are less than about .73, the Corucia may be female. If above, then a male is likely. This method also is not absolute. Of course, a gravid female will have significant girth to give one a good idea of sex and as such throws the ratio off in the case of the C/A. If the Corucia is not malnurished, a thin build Corucia give a better chance of being a male.


Vent Scale Sexual Dimorphism:

Another more recent observation is in the vent area. Males supposedly have a v-shape to their posterior vent scales in a male. So far, there seems to be variance in this method as well.
As far as the vent area is concerned, the Scincidae possess no femoral pores so that avenue of sex determination is a dead end.


DNA Sexual Analysis:

Sex determination by a DNA blood sample is still years in the distance. Unlike Humans that have the male with the heterogametic XY combination and females with the homogametic chromsomes XX,. lizards, such as Corucia, have the male having two of the same chromosome (homogametic) ZZ, whereas the female has heterogametic chromosomes ZW.


Introductions:

The most positive sexual indicator is introductions to different individuals. A trained eye will determine by behavior who is who genderwise. One must be quick and ready to separate two introduced combative Corucia. Extra precautions must be made to avoid being bitten. A U-shaped separation bar sometimes can be useful.


Conclusion:

In short, there is no clear - cut answer but to combine a variety of methods and hope for the best.

Sincerely,
Brian
LCRC

Last edited by Brian - LCRC/L2 (Today 04:05:24)


   

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>> Next Message:  RE: sex determination in Corucia - Pilirin, Fri Mar 28 06:49:22 2008