He or She? B. emilia

[Trevor Parsons]

Other than that (in my honest opinion) you are completely guessing!!

Sorry to hijack but here goes.





That in my opinion is not guessing

Note: those are both B. auratum at exactly the same size (Roughly 2.5" LS)

[Mark Lynes]

Check out also http://www.birdspiders.com/faq_sex.html

Mark

[Nicola Dolby]

Trevor, I'd guess one of each, then again I'm usually hopeless at this sort of thing!

[Jennifer Kitzrow]

It is never 100% accurate with all species. However, the Brachypelma genus is one of the easiest to sex ventrally.

It takes a lot of investigating (trial and error) to get even close to being good at sex determination this way. It also takes an excellent eye for detail.

I am no expert at it, but I can see minute details. I ALWAYS confirm with a molt.

[Trevor Howe]

I am not the one to know, but aren't we supposed to be looking a little higher up toward the underside of the prosoma? I thought that it was more evident in mature and sub-adult males that there Pedipalps are more rounded out and clubbed. Females don't fill their peds. with sperm. SO... I am not familiar with sexing at all, but have been reading up that the female should have a "bulge" for lack of better words, right between the opis. and prosoma. (between the two conjoining sections) of the spider. Like i keep saying, i am not familiar with any of this, but the authors of The Tarantula Keepers Guide strongly suggest checking the shed molt for this "leaflike extension between the two sects. of the specimen.
Trev

[Trevor Howe]

Sorry all, I wrote the former post before i looked on the second page, so just ignore my newby expertise. That other Trevor has the right idea though. I Think he's right on.
Other Trev

[Trevor Parsons]

Trevor, I'd guess one of each, then again I'm usually hopeless at this sort of thing!

The female is on top

[J M Clegg]

Sorry to disagree with you Trevor P. But I still think that although the pictures "look" different. The only true ways to accurately tell for sure are by pedipalps and hooks in males and by the internal flap of the epigastric furrow on a female moult.

Other than that, unless they are proven as female (by producing a sac) you are still guessing as to the accuracy of the sex by viewing the epigastric furrow externally. It may be a accurate guess, but it still a guess mate .

[Mark Lynes]

you are still guessing as to the accuracy of the sex

The female is on top, it's no guess.

Mark

[Jaco Pretorius]

I would say its female. A side view would have helped aswell. It is believed that the epigastric furrow bulges out, this may also be species specific. This is not a rule of thumb but it works on my spiders esp the brachypelmas. The best way would be to inspect the shedded skin

[James Box]

lol...can you imagine some alien abductors debating about sexing humans like that? somehow a funny image in my head, what with all our talk of bulges, furrows, and bits and bobs lol!

[Claudia Baines]

It looks like a lady to me, although you can't see the tips of the pedipalps in the pictures, the best way to tell is to see if it has little hooks on the end of them. These don't appear until the spiders mature though. How old is it?