sentence: Adults live in the digestive tract of vertebrates, especially fish.
sentences_before: Acanthocephalans have complex life cycles, with various hosts, including invertebrates, fishes, amphibians, birds, and mammals. The juveniles are parasitic in crustaceans and insects.
sentences_after: About 1150 species have been described.
concept_name: adult
headings: Acanthocephala
categories: Rotifers Parasites