sentence: Skippers have their antennae clubs hooked backward like a crochet.
sentences_before: They are a bit different from other butterflies, which are classified in the superfamily Papilionoidea.
sentences_after: The other butterflies have club-like tips to their antennae. Hesperioidea' is very likely the sister group of Papilionoidea. Walter de Gruyter, Berlin, New York.
concept_name: skipper
headings: Skipper (butterfly)