''Cryptodifflugia'' is a genus of arcellinid testate amoebae. It contains all the species previously grouped as the genus ''Difflugiella'', which is now a synonym of ''Cryptodifflugia''.

Description

''Cryptodifflugia'' species are characterized by a

shell Shell may refer to: Architecture and design * Shell (structure), a thin structure ** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses Science Biology * Seashell, a hard outer layer of a marine ani ...

with an oval egg-like shape with a short neck. Their surface is either smooth or adhering foreign particles. The shell can be colorless, yellow or brown, composed of an outer proteinaceous material that is usually lined. The shell's aperture is terminal, and has either a circular or an oval shape. They present pseudopods in the form of ectoplasmic anastomosing reticulopods, i.e. like fine threads that can branch or anastomose (meaning they can form links with each other) to create a dense network.

Classification

The classification of the genus, as revised in 2017, identifies 23 species along with some subspecies: *'' Cryptodifflugia angulata'' Playfair, 1917 –

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

*'' Cryptodifflugia angusta'' (Schönborn, 1965) Page, 1966 –

Bulgaria Bulgaria, officially the Republic of Bulgaria, is a country in Southeast Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey t ...

Poland Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukrai ...

Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...

*'' Cryptodifflugia angustastoma'' Beyens et Chardez, 1982 –

Belgium Belgium, officially the Kingdom of Belgium, is a country in Northwestern Europe. Situated in a coastal lowland region known as the Low Countries, it is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeas ...

*'' Cryptodifflugia apiculata'' (Cash, 1904) Page, 1966 –

England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...

Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...

Romania Romania is a country located at the crossroads of Central Europe, Central, Eastern Europe, Eastern and Southeast Europe. It borders Ukraine to the north and east, Hungary to the west, Serbia to the southwest, Bulgaria to the south, Moldova to ...

*'' Cryptodifflugia bassini'' Bobrov, 2001 –

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

*'' Cryptodifflugia brevicolla'' Golemansky, 1979 –

Vietnam Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about and a population of over 100 million, making it the world's List of countries and depende ...

*'' Cryptodifflugia collum'' (Chardez, 1971) Bobrov & Mazei, 2017 –

France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...

*'' Cryptodifflugia compressa'' Penard, 1902 –

cosmopolitan Cosmopolitan may refer to: Internationalism * World citizen, one who eschews traditional geopolitical divisions derived from national citizenship * Cosmopolitanism, the idea that all of humanity belongs to a single moral community * Cosmopolitan ...

**''Cryptodifflugia compressa angustioris'' Tarnogradsky, 1959 –

Caucasus The Caucasus () or Caucasia (), is a region spanning Eastern Europe and Western Asia. It is situated between the Black Sea and the Caspian Sea, comprising parts of Southern Russia, Georgia, Armenia, and Azerbaijan. The Caucasus Mountains, i ...

Spitsbergen Spitsbergen (; formerly known as West Spitsbergen; Norwegian language, Norwegian: ''Vest Spitsbergen'' or ''Vestspitsbergen'' , also sometimes spelled Spitzbergen) is the largest and the only permanently populated island of the Svalbard archipel ...

**''Cryptodifflugia compressa australis'' Playfair, 1917 –

**''Cryptodifflugia compressa ovata'' Playfair, 1917 –

*'' Cryptodifflugia crenulata'' Playfair, 1917 –

**''Cryptodifflugia crenulata glabra'' (Schönborn, 1965) Bobrov & Mazei, 2017 –

**''Cryptodifflugia crenulata globosa'' Playfair, 1917 –

Greenland Greenland is an autonomous territory in the Danish Realm, Kingdom of Denmark. It is by far the largest geographically of three constituent parts of the kingdom; the other two are metropolitan Denmark and the Faroe Islands. Citizens of Greenlan ...

South Georgia South Georgia is an island in the Atlantic Ocean, South Atlantic Ocean that is part of the British Overseas Territories, British Overseas Territory of South Georgia and the South Sandwich Islands. It lies around east of the Falkland Islands. ...

, Île de la Possession, Îles Crozet *'' Cryptodifflugia horrida'' Page, 1966 –

Czech Republic The Czech Republic, also known as Czechia, and historically known as Bohemia, is a landlocked country in Central Europe. The country is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the south ...

*'' Cryptodifflugia lanceolata'' Golemansky, 1970 –

*'' Cryptodifflugia leachi'' Nicholls, 2006 –

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

*'' Cryptodifflugia minuta'' (Playfair, 1917) Bobrov & Mazei, 2017 –

United States of America The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 states and a federal capital district, Washington, D.C. The 48 contiguo ...

, Île de la Possession, Îles Crozet *'' Cryptodifflugia oviformis'' Penard, 1890 –

**''Cryptodifflugia oviformis fusca'' (Penard, 1890) Bonnet et Thomas, 1956 –

*'' Cryptodifflugia paludosa'' Golemansky, 1981 –

Black Sea The Black Sea is a marginal sea, marginal Mediterranean sea (oceanography), mediterranean sea lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bound ...

*'' Cryptodifflugia patinata'' (Schönborn, 1964) Bobrov & Mazei, 2017 –

*'' Cryptodifflugia psammophila'' (Golemansky, 1970) Bobrov & Mazei, 2017 –

Baltic Sea The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by the countries of Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden, and the North European Plain, North and Central European Plain regions. It is the ...

Mediterranean Sea The Mediterranean Sea ( ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern Eur ...

Caribbean Sea The Caribbean Sea is a sea of the Atlantic Ocean, North Atlantic Ocean in the tropics of the Western Hemisphere, located south of the Gulf of Mexico and southwest of the Sargasso Sea. It is bounded by the Greater Antilles to the north from Cuba ...

Atlantic Ocean The Atlantic Ocean is the second largest of the world's five borders of the oceans, oceanic divisions, with an area of about . It covers approximately 17% of Earth#Surface, Earth's surface and about 24% of its water surface area. During the ...

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

*'' Cryptodifflugia pusilla'' Playfair, 1917 –

**''Cryptodifflugia pusilla conica'' Playfair, 1917 –

*'' Cryptodifflugia sacculus'' (Penard, 1902) Deflandre, 1953 –

**''Cryptodifflugia sacculus sakotschawi'' Tarnogradsky, 1959 –

*'' Cryptodifflugia splendida'' (Schönborn, 1965) Page, 1966 –

*'' Cryptodifflugia valida'' Playfair, 1917 –

Chile Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...

*'' Cryptodifflugia voigti'' Schmidt, 1926 –

*'' Cryptodifflugia vulgaris'' (Francé, 1913) Volz, 1928 –

Excluded taxa

Several taxa previously accredited to ''Cryptodifflugia'' or ''Difflugiella'' have been excluded from the 2017 revision: * ''Difflugiella heynigi'' Schönborn, 1965 and ''Cryptodifflugia lamingerae'' Chardez, 1977 do not match the description of the genus because they are larger and characterized by an apical aboral end of the shell and a prominent long neck with collar; it is possible that these two species will soon be included in the genus '' Chardezia'' instead. * ''Cryptodifflugia sakotschawi'' and ''C. kelensis'' were mentioned by Tarnogradsky in 1945 but their descriptions were never published. * ''Cryptodifflugia turfacea'' Zacharias, 1903 and ''C. vanhoornei'' Beyens et Chardez, 1987 are thought to be more probably a different genus because they're characterized by a

retort In a chemistry laboratory, a retort is a device used for distillation or dry distillation of substances. It consists of a sphere, spherical vessel with a long downward-pointing neck. The liquid to be distilled is placed in the vessel and heat ...

-shaped shell.

References

{{Taxonbar, from=Q2897589 Tubulinea Amoebozoa genera