Two of the birds unique to Guam now survive only as a result of captive breeding: the Guam Rail (Smithsonian National Zoo) and the Guam Kingfisher (Lincoln Park Zoo). Four additional endemic birds are recently extinct: the Guam Broadbill Myiagra freycineti (fws.gov), the Guam Reed Warbler Acrocephalus luscinius (Wikimedia Commons), a subspecies of the Rufous Fantail Rhipidura rufifrons uraniae (Guampedia), and the Guam Bridled White-eye Zosterops conspicillatus conspicillatus (fws.gov), a subspecies of the Bridled White-eye which has a second subspecies that survives in the Northern Mariana Islands.
Flying Fox (Planet'
is also extinct.
Freshwater fish unique to Guam include an undescribed freshwater sleeper goby of the genus Eleotris that is a blind cave dweller (p. 6 of CRI pdf file) and an undescribed goby of the genus Stenogobius (p. 126 of dawr.guam.gov pdf file). The Pencil Dottyback Lubbockichthys myersi (Native Fish Lab pdf file) and the Yellow-crowned Butterflyfish Chaetodon flavocoronatus (eol) are endemic marine fish.
Endemic insects include a katydid Salomona guamensis (OSF), a raspy cricket Niphetogryllacris marianae (p. 5 of Micronesica pdf file), a flat bark beetle Propalticus scriptitatus (4a on p. 17 of Bishop Museum 6 MB pdf file), a shore bug Saldula guamensis (p. 7 of Bishop Museum pdf file), a plant bug Peritropis guamensis (p. 7 of Bishop Museum 6 MB pdf file), a leafroller moth Alcina stenotes (Tortricid.net), and an extinct butterfly Neptis guamensis (BHL).
Land snails restricted to Guam include Partula radiolata (ARKive),
the extinct Partula
(p. 13 of Bishop
Museum pdf file), and
endemic genera Ladronellum
Archive) and Himeroconcha
Archive). Other endemic invertebrates include a
a shrimp Axiopsis pica
an amphipod Hadzia guamensis
(p. 3 of CaveBiology.com
and several crabs: Dynomene
(FLMNH), Harryplax severus (ZooKeys),
(p. 10 of Raffles
Museum 8 MB pdf file), Calappa karenae
Museum), and Olenothus
The crab Conleyus
is the sole species in the family Conleyidae.
Guam has about a dozen species of vascular plants known from nowhere else (ResearchGate) including Eugenia bryanii (flickr), Hedyotis megalantha (GPEPP), a pondweed Potamogeton marianensis (p. 135 of dawr.guam.gov pdf file), Phyllanthus mariannensis (Pensoft) (flickr), Phyllanthus saffordii (flickr), Psychotria malaspinae (GPEPP pdf file), Psychotria andersonii (JSTOR), Elatostema stenophyllum (JSTOR), Dianella saffordiana (flickr), Tinospora homosepala (GPEPP), and the ferns Cyclosorus (or Christella) guamensis (eol) and Ceratopteris gaudichaudii (flickr).
Guam is a territory of the United States of America, part of the Marianas Tropical Dry Forests ecoregion (EoE), and is included in the Polynesia-Micronesia biodiversity hotspot (CEPF). For an overview of Guam's marine biodiversity see the special issue of Micronesica (Micronesica) and for a general overview of Guam's biodiversity see the "Guam Comprehensive Wildlife Conservation Strategy" (dawr.guam.gov pdf file).