Quadrigyridae is the only family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 within Gyracanthocephala, an order

Order (biology)

In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...

 of parasitic worm

Worm

The term worm refers to an obsolete taxon used by Carolus Linnaeus and Jean-Baptiste Lamarck for all non-arthropod invertebrate animals, and stems from the Old English word wyrm. Currently it is used to describe many different distantly-related animals that typically have a long cylindrical...

s of class

Class (biology)

In biological classification, class is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order...

 Eoacanthocephala

Eoacanthocephala

Eoacanthocephala is a class of parasitic worms, within the phylum Acanthocephala. They feed on any aquatic cold-blooded creature such as turtles and fish. The only reliable way to identify the group is that they only have one cement gland. This is a primitive characteristic and hence the name....

. This family contains two subfamilies, ten genera

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 and about 92 species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

.

Acanthogyrus

Contains the following species:

• Acanthogyrus acanthogyrus Thapar, 1927
• Acanthogyrus acanthuri (Cable and Quick, 1954)
• Acanthogyrus anguillae (Wang, 1981)
• Acanthogyrus antspinis (Verma and Datta, 1929)
• Acanthogyrus arii (Bilgees, 1971)
• Acanthogyrus bacailai (Verma, 1973)
• Acanthogyrus cameroni (Gupta and Kajaji, 1969)
• Acanthogyrus dattai (Podder, 1938)
• Acanthogyrus giuris (Soota and Sen, 1956)
• Acanthogyrus golvani (Gupta and Jain, 1980)
• Acanthogyrus guptai Gupta and Verma, 1976
• Acanthogyrus holospinus (Sen, 1937)
• Acanthogyrus indica (Tripathi, 1959)
• Acanthogyrus intermedius (Achmerov, et al, 1941)
• Acanthogyrus maroccanus (Dollfus, 1951)
• Acanthogyrus multispinus Wang, 1966
• Acanthogyrus nigeriensis Dollfus and Golvan, 1956
• Acanthogyrus oligospinus (Anantaraman, 1969)
• Acanthogyrus papilo Troncy and Vassiliades, 1974
• Acanthogyrus partispinus Furtado, 1963
• Acanthogyrus periophthalmi (Wang, 1980)
• Acanthogyrus scomberomori (Wang, 1980)
• Acanthogyrus shashiensis (Tso, Chen, and Chien, 1974)
• Acanthogyrus similis (Wang, 1980)
• Acanthogyrus sircari (Podder, 1941)
• Acanthogyrus thapari (Parasad, et al, 1969)
• Acanthogyrus tilapiae (Baylis, 1948)
• Acanthogyrus tripathi Rai, 1967
• Acanthogyrus vittatusi (Verma, 1973)

Devendrosentis

Contains the following species:

• Deltacanthus scorzai (Diaz-ungria, et al, 1957)

Devendrosentis

Contains the following species:

• Devendrosentis garuai Sahay, Sinha, Gosh, 1971

Palliolisentis

Contains the following species:

• Palliolisentis ornatus Machado, 1960
• Palliolisentis polyonca Schmidt and Hugghins, 1973
• Palliolisentis quinqueungulis Machado, 1960

Pallisentis

Contains the following species:

• Pallisentis allahabadii Agarwal, 1958
• Pallisentis basiri Farooqi, 1958
• Pallisentis cavasii Gupta and Verma, 1980
• Pallisentis cholodkowskyi (Kostylev, 1928)
• Pallisentis cleatus (Van Cleave, 1928)
• Pallisentis colisai Sarkar, 1956
• Pallisentis fasciata Gupta and Verma, 1980
• Pallisentis gaboes (Maccallum, 1918)
• Pallisentis golvani Troncy and Vassiliades, 1973
• Pallisentis gomtii Gupta and Verma, 1980
• Pallisentis guntei Sahay, Nath, and Sinha, 1967
• Pallisentis magnum Saeed and Bilgees, 1971
• Pallisentis nagpurensis (Bhalerao, 1931)
• Pallisentis nandai Sarkar, 1953
• Pallisentis ophiocephali (Thapar, 1931)
• Pallisentis panadei Rai, 1967
• Pallisentis umbellatus Van Cleave, 1928
• Pallisentis ussuriensis (Kostylev, 1941)

Quadrigyrus

Contains the following species:

• Quadrigyrus brasiliensis Machado, 1941
• Quadrigyrus chinensis Mao, 1979
• Quadrigyrus nickoli Schmidt and Hugghins, 1973
• Quadrigyrus rhodei Wang, 1980
• Quadrigyrus torquatus Van Cleave, 1920

Raosentis

Contains the following species:

• Raosentis podderi Datta, 1947
• Raosentis thapari Rai, 1967

Saccosentis

Contains the following species:

• Saccosentis ophiocephali Jain and Gupta, 1979
• Saccosentis pesteri Tadros, 1966