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    Thread: Another Method to Sex a Tarantula?

    1. #1
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      Another Method to Sex a Tarantula?

      I recently saw discussion elsewhere of another diagnostic tool to determine gender on our pet tarantulas. According to this discussion, the spacing between the last pair of legs (where they join to the carapace) is much broader for females than for males (I got the picture that males might even lack any space).

      SO, I thought it would be fun to test that theory here with examples from you all of ventral shots of Ts that you know the gender of already. If we establish anything here, perhaps we can start using that either on this thread or on another. Does this work? Is it limited to certain species or genus? Is it bogus?

      For starters, here is my confirmed female Brachypelma albiceps
      Click image for larger version. 

Name:	_MG_7357a B albiceps sm.jpg 
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      My male Brachypelma vagans
      Click image for larger version. 

Name:	_MG_7361a B vagans male sm.jpg 
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ID:	14120

      And my controverted Brachypelma albopilosum (2"). There I go breaking my rule about known genders in the very opening post!
      Click image for larger version. 

Name:	_MG_7360a B albopilosum sm.jpg 
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ID:	14121

      Also, if anyone has comparisons between male and female of the same species, that would help this "experiment"

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      Originally Posted by ManlyMan7

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      Originally Posted by crawltech
      Toss the male in, take him out of the water dish in bolus form the next day.

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    2. #2
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      Hmmm interesting there does seem to be a difference between your albiceps doesn't there .......... we will have to see some more comparisons
      0.0.1 A. caniceps
      1.0.0 A. seemanni
      0.0.1 A. metallica
      0.0.1 A. versicolour
      0.0.1 B. albiceps
      0.0.2 B. albopilosum
      0.0.1 B. auratum
      0.0.1 B. boehmei
      0.0.1 B. emilia
      0.0.1 B. smithi
      0.0.1 B. vagans
      0.0.1 B verdezi
      0.0.1 C. fasciatum
      0.0.1 E. sp "RED"
      1.0.7 G. rosea
      0.0.1 G. pulchra
      0.0.5 G. pulchripes
      0.0.1 L. parahybana
      0.0.1 N. chromatus
      0.0.1 P. regalis
      0.0.1 P. irminia

      1.0.0 B. albopilosum RIP Homer
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    3. #3
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      The last one (B. albopilosum) will be the most interesting to watch as the 1 3/8" molt of this T was likely too small to be definitive, but some said it was male. According to the theory, this space looks the most female of any of the three.

      The female albiceps' leg gap looks just as close together as the male vagans, until you notice that the vagan's legs are larger in this picture.

      IDK, I am exploring this and am ready to discard it if it comes short of evidence.

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      Originally Posted by ManlyMan7

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      Originally Posted by crawltech
      Toss the male in, take him out of the water dish in bolus form the next day.

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    4. #4
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      Put their size as well as it may come into play (more/less space between a 1in and a 6 in)... possibly...
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    5. #5
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      Quote Originally Posted by ***Beth*** View Post
      Put their size as well as it may come into play (more/less space between a 1in and a 6 in)... possibly...
      Definitely a possible factor. For the record, the smallest T in those pics (the B. albopilosum) has the widest gap while the smallest gap goes to the largest T (the B. vagans). That will be something to take not of in comparisons here. Ultimately, same-sized comparisons between male and female of same species would be ideal.

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      Originally Posted by ManlyMan7

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      Originally Posted by crawltech
      Toss the male in, take him out of the water dish in bolus form the next day.

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    6. #6
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      Here's a Female OBT at about 4 inches...
      Click image for larger version. 

Name:	DSC03319.jpg 
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ID:	14129

      Here's a different female OBT about the same size
      Click image for larger version. 

Name:	DSC03204.jpg 
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ID:	14130

      Here's a female P. Irminia about 4.5 inches
      Click image for larger version. 

Name:	DSC03216.jpg 
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ID:	14131

      Here's a 3 inch H. Mac... I THINK it's male but it's not confirmed
      Click image for larger version. 

Name:	DSC03242.jpg 
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ID:	14132

      Here's a female L. Violaceopes 6in
      Click image for larger version. 

Name:	10.jpg 
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ID:	14133



      I don't have much of anything for male undersides.. I may take some pics this weekend...
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    7. #7
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      Thanks Beth. I have forgotten about this and nice to be reminded again.

    8. #8
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      Here's my recently identified 6" female Nhandu chromatus female. I'll go through my pics and look for any other vent shot examples that I can find.

      Click image for larger version. 

Name:	2013-02-13_Nhandu chromatus-03.jpg 
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ID:	45171

      And just to be clear, is this the area that we are talking about?

      Here she is at around 3".
      Click image for larger version. 

Name:	*04-18-11_N. chromatus-02wtmk.jpg 
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ID:	45172

      And at 2"
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Name:	*05-04-11_N. chromatus-07wtmk.jpg 
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      Last edited by J!m; 02-13-2013 at 06:20 PM.
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    9. #9
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      This thread needs to be Sticky'd if we're going to see if it's a viable method for sexing. So I just sticky'd it.
      "I am what I am and that's all what I am."


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    10. #10
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      4" Tapinauchenius plumipes Female

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Name:	*08-23-10_T. plumipes-10wtmk.jpg 
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      "I am what I am and that's all what I am."


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