Annelids are capable of both sexual and asexual reproduction. The majority of annelids are hermaphroditic and have a set of functional male and female sex organs. Some species reproduce primarily by budding, while others reproduce by laying and fertilizing eggs that hatch into planktonic larvae.
Annelids are a large and diverse family that encompasses 17,000 species of earthworms, tubeworms, leeches, ragworms and other segmented, symmetrical worm-like invertebrates. They range in size from microscopic marine polychaetes to the Australian giant Gippsland earthworm, which reaches over 3 feet in length on average and can reach over 9 feet under the right conditions.