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Some help sexing/bad info?

tapkoote

Active Member
3 Year Member
Messages
127
Location
the great north west
My first T-B-smithi 3 3/4 inch. I bought it as a female, it's molted, no spermathecae.
Now the lady at the pet shop says it wont show up until it's mature.
I would think this spider is large enough to be mature. Any help?
Thanks
 

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plessey

Well-Known Member
3 Year Member
Tarantula Club Member
Messages
325
Location
The Black Lodge
No spermathecae, uterus externus or bursa copulatrix visable. At 3 3/4" you would be able to see these fairly easily if your spider was female. The pet shop lady is talking out her poo hole I'm afraid.
 

Nicolas C

Well-Known Member
3 Year Member
Messages
686
Location
Corcelles-près-Payerne, Switzerland
I'm embarrassed: on the ventral shot, it looks male to me. But it seems there is something between the book lungs in the molt. The problem is as it isn't focused, it's hard to tell. But it could be female.


Envoyé de mon iPhone en utilisant Tapatalk
 

plessey

Well-Known Member
3 Year Member
Tarantula Club Member
Messages
325
Location
The Black Lodge
The only thing between the book lungs is a blurry gonopore. If it was a female then the bursa copulatrix would be the most obvious feature to see from that angle, slightly blurry or not. I just wish people would stop trying to sex spiders based purely on spermathecae alone.
 

tapkoote

Active Member
3 Year Member
Messages
127
Location
the great north west
The only thing between the book lungs is a blurry gonopore. If it was a female then the bursa copulatrix would be the most obvious feature to see from that angle, slightly blurry or not. I just wish people would stop trying to sex spiders based purely on spermathecae alone.
plessey I'm new to all this
I looked up the bursa copulatrix, there's a hand drawing stating it's not shed in molt. I'm confused, standing by.Screen Shot 2017-02-04 at 9.44.07 AM.png
 

plessey

Well-Known Member
3 Year Member
Tarantula Club Member
Messages
325
Location
The Black Lodge
No worries we are here to help.

Below that drawing it says "This drawing shows how all the parts connect with the organs that are not shed during a moult." Just underneath it it says "Uterus internus. A short section of tube that connects to the uterus externus at one end and to the oviducts at the other. This along with the oviduct and ovaries is not shed." The photograph above the drawing shows the spermathecae, uterus externus and bursa copulatrix so these parts are obviously shed.

The bursa copulatrix is the lower alcove that is formed below the spermathecae and the uterus externus. It is an elliptical shaped indentation in the shed skin that is only found in females.
 

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