The Schaus swallowtail was listed as a federal threatened species on April 28, 1976. The photograph was taken from above - you can see the upper surfaces of the butterfly. They are very different. Schaus' swallowtail (Papilio aristodemus ponceanus) occupied mature tropical hardwood hammocks from South Miami to Lower Matecumbe Key in the Florida Keys in 1911. Schaus' swallowtail, Papilio aristodemus, is an endangered butterfly species of the family Papilionidae.It is named after a Miami Lepidoptera collector, William Schaus, who discovered it in 1911. Historically, their range extended from south Miami to Lower Matecumbe Key. Jan 12, 2016 - The Schaus Swallowtail was initially listed under the Endangered Species Act as “Threatened” in 1976 and then “Endangered” in 1984. The Schaus’ swallowtail butterfly (Heraclides arisodemus ponceanus) is a large dark brown and yellow butterfly that can be found in the tropical hardwood hammock of North Key Largo and Elliot Key. The butterfly is restricted to intact tropical hardwood hammocks and their associated margins. It was reclassified as a federal endangered species on August 31, 1984, following several years of additional population declines. Papilio aristodemus ponceanus, more popularly known as the Schaus swallowtail butterfly, was first described by William Schaus in 1911, when he found the species scattered amongst “tropical hardwood hammocks” ( in layman’s terms – any raised ground covered with trees) ranging from South Miami to Lower Matecumbe Key in the Florida Keys.. The Schaus' Swallowtail is endangered because of habitat loss and because the pesticides used to kill mosquitoes are killing the butterflies. Schaus' swallowtail butterfly This is a photograph of a Schaus' swallowtail we have here in the Museum. The Schaus swallowtail was initially listed under the Endangered Species Act as "Threatened" in 1976 and then "Endangered" in 1984. Schaus' swallowtail butterfly. Overview. Compare this to the picture of the same butterfly taken from below. During the 2011 survey, there were 41 individuals counted - 35 in Biscayne National Park (mostly on Elliott Key) and six outside the park on north Key Largo. Their decline can be attributed mainly to habitat loss as well as the spraying of insecticides for mosquito control. They are an extremely endangered species with only a few hundred individuals left. During the 2011 survey, there were 41 individuals counted – 35 in Biscayne National Park (mostly on Elliott Key) and six outside the park on north Key Largo. Habitat loss to housing developments, insecticide spraying, and overcollection extirpated the species from the mainland in 1924, and from the Lower and Upper Matecumbe Keys in the 1940s.

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