United States of America
Checklist of Endemic Animal and Plant Families
This list of animal and plant families found exclusively in the United States of America is based on the taxonomy used in the Mammal Diversity Database (2020) for mammals, del Hoyo & Collar (2014 & 2016) for birds, the Reptile Database (2018) for reptiles, AmphibiaWeb (2018) for amphibians, Eschmeyer's Catalog of Fishes (2023) for fishes, and POWO (2024) for vascular plants. Invertebrates are based on Zhang (2013), Zhang (2011), and Roskov et al. (2014) depending on the group. Families described after these sources are indicated by the year of description. For further details on the sources and possible inaccuracies in the list see Sources & Caveats.
Haplotaxoididae 1 gen. 2 spp. (Annelida Clitellata ) 2024
Komarekionidae 1 gen. 1 spp. (Annelida Clitellata )
Lutodrilidae 1 gen. 1 spp. (Annelida Clitellata )
Megahexuridae 1 gen. 1 spp. (Arthropoda Arachnida Araneae) 2019
Trogloraptoridae 1 gen. 1 spp. (Arthropoda Arachnida Araneae)
Cryptomastridae 2 gen. 4 spp. (Arthropoda Arachnida Opiliones) 2018
Elliptochthoniidae 1 gen. 9 spp. (Arthropoda Arachnida Sarcoptiformes)
Proteonematalycidae 1 gen. 1 spp. (Arthropoda Arachnida Sarcoptiformes)
Amoenacaridae 1 gen. 3 spp. (Arthropoda Arachnida Trombidiformes)
Amphotrombiidae 1 gen. 1 spp. (Arthropoda Arachnida Trombidiformes)
Crotalomorphidae 1 gen. 1 spp. (Arthropoda Arachnida Trombidiformes)
Dumontidae 1 gen. 1 spp. (Arthropoda Crustacea Branchiopoda)
Allocrangonyctidae 1 gen. 2 spp. (Arthropoda Crustacea Malacostraca)
Parabogidiellidae 2 gen. 2 spp. (Arthropoda Crustacea Malacostraca) 2020
Adritylidae 1 gen. 3 spp. (Arthropoda Diplopoda Chordeumatida)
Apterouridae 1 gen. 2 spp. (Arthropoda Diplopoda Chordeumatida)
Branneriidae 1 gen. 2 spp. (Arthropoda Diplopoda Chordeumatida)
Buotidae 1 gen. 1 spp. (Arthropoda Diplopoda Chordeumatida)
Microlympiidae 1 gen. 1 spp. (Arthropoda Diplopoda Chordeumatida)
Urochordeumatidae 1 gen. 1 spp. (Arthropoda Diplopoda Chordeumatida)
Aprosphylosomatidae 1 gen. 1 spp. (Arthropoda Diplopoda Julida)
Chelojulidae 1 gen. 1 spp. (Arthropoda Diplopoda Julida)
Paeromopodidae 2 gen. 16 spp. (Arthropoda Diplopoda Julida)
Telsonemasomatidae 1 gen. 1 spp. (Arthropoda Diplopoda Julida)
Zosteractinidae 2 gen. 2 spp. (Arthropoda Diplopoda Julida)
Floridobolidae 1 gen. 2 spp. (Arthropoda Diplopoda Spirobolida)Choctellidae 1 gen. 2 spp. (Arthropoda Diplopoda Spirostreptida)
Diphyllostomatidae 1 gen. 3 spp. (Arthropoda Insecta Coleoptera)
Curaliidae 1 gen. 1 spp. (Arthropoda Insecta Hemiptera)
Pityococcidae 2 gen. 5 spp. (Arthropoda Insecta Hemiptera)
Lepidotrichidae 1 gen. 1 spp. (Arthropoda Insecta Zygentoma)
Bathybelidae 1 gen. 1 spp. (Chaetognatha )
Amphiumidae 1 gen. 3 spp. (Chordata Amphibians )
Rhyacotritonidae 1 gen. 4 spp. (Chordata Amphibians )
Mohoidae 2 gen. 5 spp. (Chordata Birds ) EXTINCT
Polyodontidae 2 gen. 2
spp. (1 EXTINCT) (Chordata Actinopteri Acipenseriformes)
Elassomatidae 1 gen. 7
spp. (Chordata Actinopteri Centrarchiformes)
Amblyopsidae 6 gen. 9
spp. (Chordata Actinopteri Percopsiformes)
Aphredoderidae 1 gen. 1
spp. (Chordata Actinopteri Percopsiformes)
Rhineuridae 1 gen. 1 spp. (Chordata Reptiles )
Tottonophyidae 1 gen. 1 spp. (Cnidaria Hydrozoa ) 2018
Amastridae 10 gen. 327 spp. (Mollusca Gastropoda )
Berntsenidae 1 gen. 2 spp. (Nematoda Chromadorea )
Acipensericolidae 1 gen. 2 spp. (Platyhelminthes Rhabditophora ) 2023
Crassicollidae 1 gen. 1 spp. (Platyhelminthes Rhabditophora )
Coronistomidae 1 gen. 1 spp. (Rotifera Bdelloidea ) 2021