Most wirms are born female, although there are anomalies that result in male and intersex wirms being born. 

Wirms reproduce through parthenogenesis, similarly to the Mexican Whiptail Lizard. They lay eggs that can incubate anywhere from 1-4 months, depending on the size of the wirm that laid them. The eggs are laid in clutches of 1-3 each.

Wirm subspecies can take on a variety of different properties, such as venom, stingers, armour, and various different sizes.

Wirms are generally warm-blooded, which means that they generate their own body heat. Subspecies are more likely to be cold-blooded if they live in a warmer area or closer to the equator.

Wirms don't have much in the way of sexual dimorphism, as they are mostly female and don't really have a need for it. In other words, you're not going to be able to tell what a wirm's sex is just by looking at them.

Wirms will continue to grow throughout their lifetime, resulting in the oldest wirms being the biggest.