Sexually Dimorphic Tarantulas

[CrazyOrnithoctonineGuy]

AFAIK there aren't any tarantulas that are sexually dimorphic before maturity.

A few are, but they're the minority.

 

[rustynotnewb]

1.0 irminia males change color to gray all over and females only are black

0.1 C versi have a white dot on their upper lip

1.0 P rufilata have a dot just above their vent

All Ceratogyrus that grow a horn are female, males have “buttons” Maybe there’s an exception but I am not aware of that.

When you say all female Ceratogyrus grow a horn, you are talking about as they are maturing, correct? So like, if I'm watching my darlingi as it is growing, the horn becoming more pronounced is a good sign that it's female? I had (in years passed) heard that male marshalli will grow a horn and then when it reaches sexual maturity, it would kind of fall off with it's ultimate molt. Any expansion on this genus and their horny nature would be appreciated.

 

[viper69]

When you say all female Ceratogyrus grow a horn, you are talking about as they are maturing, correct? So like, if I'm watching my darlingi as it is growing, the horn becoming more pronounced is a good sign that it's female? I had (in years passed) heard that male marshalli will grow a horn and then when it reaches sexual maturity, it would kind of fall off with it's ultimate molt. Any expansion on this genus and their horny nature would be appreciated.

Big horns - female
Buttons - male

I don’t recall that with my marshalli but it has been a long time

 

[CEC]

AFAIK there aren't any tarantulas that are sexually dimorphic before maturity.

(11) Lampropelma sp. 'Borneo' sexual dimorphism | Arachnoboards

(11) Poecilotheria ornata sexual dimorphism | Arachnoboards

Also the Southern form of Avicularia purpurea (possibly hobby Avicularia sp. "Ecuador"). Females are described as keeping their abdominal pattern into maturity, whereaas the males typically lose the pattern a few molts prior, similar to the Northern form (hobby Avicularia purpurea).

 

[MrFuzzBugz]

I had a Phormingochilus everetti, the male is a completely tan color with tan hairs, while the female retains its black leafy pattern on the abdomen with orange hairs. Beautiful species but short-lived, relatively speaking.

 

[gabrieldezzi]

Big horns - female
Buttons - male

I don’t recall that with my marshalli but it has been a long time

My marshalli stopped growing his horn at the 2” mark lol, and he’s male