IN WORLD
By Intreasures (SEE), out of 7,114 families (1,115 vertebrates, 5,521 invertebrates, and 474 vascular plants), 573 are single nation endemics widely in 81 countries.
Australia (153), New Zealand (50), U.S.A. (45), Madagascar (36), South Africa (25), Japan (24), Brazil (20), Russia (19), China (16, inc. two in Taiwan province), India (12), Spain (11), Italy (10), Chile (10), Mexico (9), New Caledonia (8), Indonesia (7), Argentina (7), Philippines (5), Ecuador (4), Cuba (4), Vietnan (4), Norway (3, Hexanauplia, Nematoda), French Southern and Antarctic Lands (3, Arachnida, Malacostraca), Bermuda (3), D.R. Congo (3, Arachnida, Diplopoda), Thailand (3, Arachnida, Malacostraca), Mozambique (3, Malacostraca, Bryozoa, Gastropoda), Palau (2, Actinipterigii, Platyhelminthes), Fiji (2, angiosperm, Arachnida), Panama (2, Diplopoda, Malacostraca), Seychelles (2, Malacostraca, Amphibia), Colombia (2, Anellida, Insecta), Malaysia (2, Arachnida), France (2, Diplopoda), Greece (2, Diplopoda, Ostracoda), Iceland (2, Malacostraca), Namibia (2, angiosperms, Insecta), Kenya (2, Malacostraca, Insecta), Egypt (2, Platyhelminthes), Cape Verde (2, Crustacea, Arthropoda), Cameroom (1, Cnidaria), Cote d'Ivoire (1, Collembola), Mauritania (1, Malacostraca), Mauritius (1, Reptilia), São Tomé & Principe (1, Gastropoda), Sudan (1, Malacostraca), Tanzania (1, Insecta), Tunisia (1, Malacostraca), Zimbabue (1, Insecta), French Polynesia (1, Malacostraca), Guam (1, Malacostraca), Papua New Guinea (1, Insecta), Tonga (1, Hexanauplia Thecostraca), Vanuatu (1, Platyhelminthes), Bosnia & Hercegovina (1, Diplopoda), Brunei (1, Aracnida), Croatia (1, Diplopoda), Denmark (1, Gnathostomulida), Hungary (1, Nematoda), Iran (1, Arachnida), Israel/Palestine (1, Arachnida), Kazakhstan (1, Insecta), South Korea (1, Collembola), Lebanon (1, Malacostraca), Portugal (1, Diplopoda), Sri Lanka (1, Diplopoda), Turkyie (1, Acoelomorpha), Uzbekistan (1, Malacostraca), Bahamas (1, Remipedia), Belize (1, Gnathostomulida), Bolivia (1, Arachnida), Costa Rica (1, Arachnida), Guatemala (1, Diplopoda), Haiti (1, Malacostraca), Jamaica (1, Gastrotricha), Peru (1, Platyhelminthes), Puerto Rico (1, Avialia), Saint Vicent (1, Gastropoda), South Georgia (1, Hexanauplia), Turks y Caicos (1, Remipedia), Venezuela (1, Insecta).
21 countries has 4 or more endemic families (488 endemic families, joined); six have exactly 3 families (18 endemic families, in total); 13 have excatly two endemic families (26 endemic families, in total); 41 have excatly a single endemic family (41 families in total).
353 families (61%) belongs the 7 countries with 20 or more endemic families: Australia, New Zealand, U.S.A., Madagascar, South Africa, Japan and Brazil. The largest are Amastridae (U.S.A., Hawaii, (10/)327 spp., almost all extinct), Acanthogammaridae ((41/)159 spp.) and Eulimnogamaridae ((19/)115 spp.), these latters Malacostraca from Baikal Basin, Russia.
IN NEW WORLD
The data shown here follows the national lists on the Intreasures (SEE). Together, the 23 New World countries with endemic families bring together 112 of them; U.S.A. (45) and Brazil (20) take more than half of this package and stand out as 3th and 7th, respectively, in the number of restricted families (Rankings).
At larger groups, Brazil has endemic genera in Annelida, Arachnida, Malacostraca, Diplopoda, Insecta, Bryozoa, Brachiopoda, Amphibia, Fishes, Gastropoda and Platyhelminthes. New World countries that have all their endemic families to these groups, and in less or equal numbers, are: Bolivia (1), Colombia (2), Costa Rica (1), Ecuador (4), Guatemala (1), Haiti (1), Panamá (2), Peru (1), Saint Vicent (1), South Georgia (1) and Venezuela (1).
Cuba (4) and Puerto Rico (1) escape this list because they have endemic bird families (Cuba also by a reptile endemic family); Turks y Caicos (1) and Bahamas (2), because they have endemics families in Remipedia; Bermuda (3), Belize (1) and Jamaica (1) escape by having exceptions in marine small organisms, either Malacostraca, Nemertea, or Gnathostomulida, or Gastrotricha. All of these are Caribbean countries.
U.S.A. (45), Mexico (9), Chile (10) and Argentina (7), includes several troglobitic lineages absents in Brazil:
U.S.A.: Nematoda (1), Cnidaria (1), Chaetognatha (1), Rotifera (1).Mexico: angiosperms (1).Chile: angiosperms (2), Nemertea (1).
Argentina: Nemertea (1), Arachnida/Opiliones (1), Malacosraca (1) and angiosperms (1).
In specific groups, it is worth mentioning endemic families in Diptera (Chile), Avialia (Cuba, Puerto Rico, U.S.A.), Squamata (Cuba, Mexico, U.S.A.), Odonata (Colombia), Scorpiona (Mexico), Opiliona (Argentina, U.S.A.), Orthoptera (Mexico), Hemiptera (U.S.A.) and Zygentoma (U.S.A.), all groups without endemic families in Brazil.
SIZED
Non monogeneric lineages includes several groups:
UPDATESU.S.A.: Amastridae (10/327), Paeromopodidae (2/16), Elliptochthoniidae (1/9), Amblyopsidae (6/9), Elassomatidae (1/7), Pityococcidae (2/5), Mohoidae (2/5), Cryptomastridae (2/4), Rhyacotritonidae (1/4), Amoenacaridae (1/3), Adritylidae (1/3), Diphyllostomatidae (1/3), Amphiumidae (1/3), Allocrangonyctidae (1/2), Parabogidiellidae (2/2), Apterouridae (1/2), Branneriidae (1/2), Zosteractinidae (2/2), Floridobolidae (1/2), Choctellidae (1/2), Polyodonttidae (2/2), Berntsenidae (1/2).Mexico: Typhlochactidae (4/10), Typhlobolellidae (5/6), Xyronotidae (2/4), Bipedidae (1/3), Echinichidae (1/3).Brazil: Cycloramphidae (3/37), Jurasaidae (2/4).Chile: Calyptocephalellidae (2/5), Perciliidae (1/2).
21.01.2024 ‣ huge updates in almost numbers.20.07.2023 ‣ exclusion of Eurymerodesmidae and Euryuridae from list of U.S.A. and Eriphantidae from Mexican list (SEE).09.07.2022 ‣ addition of Mesagrionidae for Colombia (Intreasures).27.06.2022 ‣ exclusion of Cryptogeobiidae from Brazil list, due to range also at least in Argentina and Paraguay (SEE).11.02.2022 ‣ addition of Jurasaidae, a new endemic family to Brazil (Nature, 2020).11.02.2022 ‣ addition of Coronistomidae, rotifer family endemic to U.S.A. (Zootaxa, 2021).