Haplotaxida

kingdom | Animalia (animals) phylum | Annelida (segmented worms) class | Clitellata (leeches and earthworms) order | Haplotaxida (earthworms)

lifespan | 36 months maximum recorded lifespan | 10 years

normal rate of oxygen consumption per kg of body weight | 0.065 mL O2/(kg hr) (milliliters of oxygen per kilogram hour) (human: 210 to 240 mL O2/(kg hr))

number of chromosomes | 32 chromosomes (human: 46 chromosomes) number of offspring per year | 1000 (human: 0.49)

(typical values, except where otherwise noted)

Alluroididae | Dorydrilidae | Enchytraeidae | ... | (total: 10)

Acanthobdellida (leeches) | Arhynchobdellida (jawed leeches) | Branchiobdellida (aquatic annelids) | ... | (total: 5)

The Haplotaxida are one of two orders within the annelid subclass Oligochaeta, the other being the Lumbriculida. No real common name exists, but they are simply referred to as haplotaxids.