''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 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 ''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 characteriz ...

'' Playfair, 1917 –

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

*''

Cryptodifflugia angusta ''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 characteriz ...

'' (Schönborn, 1965) Page, 1966 – Bulgaria, Poland, Germany *''

Cryptodifflugia angustastoma ''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 characteriz ...

'' Beyens et Chardez, 1982 – Belgium *''

Cryptodifflugia apiculata ''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 characteriz ...

'' (Cash, 1904) Page, 1966 – England, Russia, Germany, Romania *''

Cryptodifflugia bassini ''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 characteriz ...

'' Bobrov, 2001 – Russia,

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

*''

Cryptodifflugia brevicolla ''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 characteriz ...

'' Golemansky, 1979 – Vietnam *'' Cryptodifflugia collum'' (Chardez, 1971) Bobrov & Mazei, 2017 – Belgium, France *'' Cryptodifflugia compressa'' Penard, 1902 – cosmopolitan **''Cryptodifflugia compressa angustioris'' Tarnogradsky, 1959 – Caucasus, Belgium, Germany,

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

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

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

*'' Cryptodifflugia crenulata'' Playfair, 1917 – cosmopolitan **''Cryptodifflugia crenulata glabra'' (Schönborn, 1965) Bobrov & Mazei, 2017 – Germany, Poland **''Cryptodifflugia crenulata globosa'' Playfair, 1917 –

, Poland, Germany, Greenland, Romania, Vietnam,

South Georgia South Georgia ( es, Isla San Pedro) is an island in the South Atlantic Ocean that is part of the British Overseas Territory of South Georgia and the South Sandwich Islands. It lies around east of the Falkland Islands. Stretching in the east� ...

, Île de la Possession,

Îles Crozet The Crozet Islands (french: Îles Crozet; or, officially, ''Archipel Crozet'') are a sub-Antarctic archipelago of small islands in the southern Indian Ocean. They form one of the five administrative districts of the French Southern and Antarctic ...

*'' Cryptodifflugia horrida'' Page, 1966 – Bulgaria, Germany, Poland, Czech Republic,

, Vietnam *'' Cryptodifflugia lanceolata'' Golemansky, 1970 – cosmopolitan *''

Cryptodifflugia leachi ''Cryptodifflugia leachi'' is an aquatic species of testate amoebae discovered in 2006 in Canada, living in bottom sediment from wetlands at the base of the Niagara Escarpment. Description ''Cryptodifflugia leachi'' is characterized by an oval, ...

'' Nicholls, 2006 – Canada *'' Cryptodifflugia minuta'' (Playfair, 1917) Bobrov & Mazei, 2017 –

, Russia, Greenland, USA, Île de la Possession,

*''

Cryptodifflugia oviformis ''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 characteriz ...

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

Cryptodifflugia paludosa ''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 characteriz ...

'' Golemansky, 1981 – Black Sea *''

Cryptodifflugia patinata ''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 characteriz ...

'' (Schönborn, 1964) Bobrov & Mazei, 2017 – Germany, Poland *''

Cryptodifflugia psammophila ''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 characteriz ...

'' (Golemansky, 1970) Bobrov & Mazei, 2017 – Baltic Sea, Black Sea, Mediterranean Sea, Caribbean Sea, Atlantic Ocean, Pacific Ocean *'' Cryptodifflugia pusilla'' Playfair, 1917 – cosmopolitan **''Cryptodifflugia pusilla conica'' Playfair, 1917 –

*'' Cryptodifflugia sacculus'' (Penard, 1902) Deflandre, 1953 – cosmopolitan **''Cryptodifflugia sacculus sakotschawi'' Tarnogradsky, 1959 – Caucasus *'' Cryptodifflugia splendida'' (Schönborn, 1965) Page, 1966 – Poland, Germany *'' Cryptodifflugia valida'' Playfair, 1917 –

, Chile *''

Cryptodifflugia voigti ''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 characteriz ...

'' Schmidt, 1926 – Germany, Russia, Belgium, Romania *'' Cryptodifflugia vulgaris'' (Francé, 1913) Volz, 1928 – Germany, Bulgaria, Russia

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-shaped shell.

References

{{Taxonbar, from=Q2897589 Tubulinea Amoebozoa genera