Male or female B. Hamorii based on abdomen?
K

Male or female B. Hamorii based on abdomen?

Buyers are arguing that my hamorii is a sub adult male. She is 5.5" and does not have any hooks on her legs. She also came from a molt which is why her abdomen is small. Unfortunately the exuvia was destroyed
@kerplunk Since I'm not 100% sure on your level of knowledge with ventral sexing, I'll go over everything as if you're brand new at it (so I apologize if I go over stuff you already know). Basically what we predominantly look for with ventral sexing is the presence of epiandrous fusillae, which simply put, is a dense cluster of setae and tiny spinnerets between the upper set of booklungs. Only males have these special spinnerets, as they create the webbing used exclusively by mature males for sperm webs. The color of the patch depends on the color of the species, but it's generally darker than the rest of the surrounding area and in the shape of a triangle, dot, semicircle, or other similar shapes. The presence of epiandrous fusillae means it's unquestionably male. If the spider lacks this dense patch of hairs, especially at larger sizes, it's easy to confirm as female. In some lucky cases, the female has an extremely obvious furrow or "lips", that identify her sex clear as day, but this isn't always readily apparent. Other features that help play a factor in determining the sex are the amount of space between the upper set of booklungs, the angle in which the inner wall of the booklungs are (for males, it's more straight like "| |", whereas females have a more "/ \" shape at any abdomen size), and the curve of the line below the booklungs. I always recommend reading this a few times when trying to figure out ventral sexing, and going through the gallery on here to help you fully understand it. Don't be discouraged if you still can't figure it out at first. It can be tough to get a first, but eventually it just clicks.
 
@PidderPeets Thanks again man, that was immense help. The knowledge and experience I have with ventral sexing is very very limited. Only knowing to look at the distance and angle of book lungs, the obvious furrow and the angle of the book lungs but after your explanation, I definitely feel more confident in ventral sexing now, although I will need more experience and practice. I can see it becoming very hard with specimens having completely/predominantly black undersides like most brachypelmas such as ours so it seems that getting a good clear shot is very important. Again many thanks that was invaluable information!
 
@kerplunk in those 2 pictures the part in the middle of the underside carapace, Male looks red and female pic looks black could this be a possible tell as I have a Male that looks red in that part too
 

Media information

Category
Epiandrous fusillae sexing (Not Molts)
Added by
kerplunk
Date added
View count
6,469
Comment count
24
Rating
0.00 star(s) 0 ratings

Image metadata

Filename
60946718_2770145076565274_6319544489115385856_o.jpg
File size
212.4 KB
Dimensions
768px x 1024px

Share this media

Top