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  • Whale lice are amphipods that scavenge for food on whales’ bodies, including consuming skin and flesh of whales. This species (Cyamus scammoni) lives exclusively on gray whales (Eschrichtius robustus). There is sexual dimorphism among adult Cyamus scammoni, with males being larger than females. Unlike the young of most other marine crustaceans, which have a planktonic larval stage, juvenile whale lice mature in a pouch-like structure called the marsupium, which is located on the underside of females. There is a small whale louse visible on the right side of this large amphipod’s head, hidden between the head and the forward right appendage. Photographed in Baja California, Mexico.
    cyamus-scammoni-whale-lice-gray-whal...tif
  • Infestation of whale lice (Cyamus scammoni) in the blowholes of a gray whale calf (Eschrichtius robustus). Whale lice are amphipods that scavenge for food on the whale's body, including the whale's skin and flesh. There is sexual dimorphism among adult Cyamus scammoni, with males being larger than females. Unlike the young of most other marine crustaceans, which have a planktonic larval stage, juvenile whale lice mature in a pouch-like structure called the marsupium, which is located on the underside of females. Photographed in Baja California, Mexico.
    whale-lice-cyamus-scammoni-infestati...tif
  • This gray whale calf (Eschrichtius robustus) hosts a population of commensal barnacles (Cryptolepas rhachianecti) and whale lice (Cyamus scammoni) which are amphipods that scavenge for food on the whale's body, including the whale's skin and flesh. There is sexual dimorphism among adult Cyamus scammoni, so the large individuals visible in this photograph are male. The females are smaller. Unlike the young of most other marine crustaceans, which have a planktonic larval stage, juvenile whale lice mature in a pouch-like structure called the marsupium, which is located on the underside of females.
    whale-lice-cyamus-scammoni-on-gray-w...tif
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