article_snippet: Fossils also show that Aegirocassis had pairs of swimming flaps along Aegirocassis body.
article_snippet: These were likely to be precursors of the unique double-branched appendages seen in modern crustaceans.
article_snippet: Other anomalocaridid fossils also show that Aegirocassis had pairs of swimming flaps along Aegirocassis body, which were likely to be precursors to the unique double-branched appendages seen in modern crustaceans.
article_snippet: Aegirocassis had pairs of swimming flaps along its body, which were likely to be precursors to the unique double-branched appendages seen in modern crustaceans also bear resemblance to gill flaps seen on the trunks of modern arthropods .
article_snippet: The fossil shows that Aegirocassis had pairs of swimming flaps along Aegirocassis body, which were likely to be precursors of the unique double-branched appendages seen in modern crustaceans.
article_snippet: these animals' also bear resemblance to gill flaps seen on the trunks of modern arthropods.
highlights_snippet: These were early ancestors of modern crustaceans, insects and spiders .
  