sentence: Fertilisation is probably internal.
sentences_before: Phoronids may be hermaphrodites or single sexed, and may also reproduce asexually. Gametes are released through the nephridia.
sentences_after: Phoronids follow one of two types of reproductive strategy. These eggs are brooded within the adults tube, they are released only when they have hatched. These eggs are released as soon as they are fertilised. They hatch a few days later into what is called an 'actinotrocha' larvae. Metamorphosis is 'catastrophic', occurring in less than 30 minutes and leading to a slender young phoronid.
concept_name: fertilisation
headings: Phoronida Reproduction
categories: Minor phyla