{{Short description|Family of roundworms}} {{Automatic taxobox | image = | image_alt = | image_caption = | taxon = Tetrameridae | authority = Travassos, 1914 | synonyms = *Tetrameridea <small>von Drasche, 1884</small> | synonyms_ref = | type_species = | type_species_authority = | subdivision_ranks = Subfamilies and genera | subdivision = see text }}

'''Tetrameridae''' is a family of spirurian nematodes. It is the smallest of the large genera making up the bulk of the superfamily Habronematoidea. Like all nematodes, they have neither a circulatory nor a respiratory system. They are parasites, chiefly of birds and cetaceans.

This family contains the largest known nematode: ''Placentonema gigantissima'' is several meters long and has been found in the placenta of the sperm whale (''Physeter macrocephalus'').<ref name="gubanov1951">{{Cite journal|language=ru |issn=0002-3264 |volume=77 |issue=6 |pages=1123–1125 |title=Giant nematoda from the placenta of Cetacea; ''Placentonema gigantissima nov. gen.'', ''nov. sp.'' |last=Gubanov |first=N. M. |journal=Doklady Akademii Nauk SSSR |date=1951-04-21 |url=http://www.mactode.com/page21/files/Placentonema_gigantissima.pdf |url-status=dead |archive-url=https://web.archive.org/web/20131215144805/http://www.mactode.com/page21/files/Placentonema_gigantissima.pdf |archive-date=December 15, 2013 }}</ref>

==Systematics== The Tetrameridae number about half a dozen genera only, but some are rather speciose; the type genus ''Tetrameres'' contains a lot of species even by nematode standards. While it might be overlumped, as presently delimited about half of the more than 100 species of Tetrameridae are placed in it.

'''Subfamily Crassicaudinae''' <small>Yorke & Maplestone, 1926</small> * ''Crassicauda'' <small>Leiper & Atkinson, 1914</small> * ''Placentonema'' <small>Gubanov, 1951</small> '''Subfamily Geopetitiinae''' <small>Chabaud, 1951</small> * ''Geopetitia'' <small>Chabaud, 1951 [Diagnostic; French, Todd, Zachary & Meehan 1992</small> '''Subfamily Tetramerinae''' <small>Travassos, 1914</small> * ''Microhadjelia'' <small>Jogis, 1965</small> * ''Microtetrameres'' <small>Travassos, 1915</small> <ref name="QuentinSeureau2016">{{cite journal|last1=Quentin|first1=J. C.|last2=Seureau|first2=C.|last3=Kulo|first3=S. D.|title=Cycle biologique de ''Tetrameres (Microtetrameres) inermis'' (Linstow, 1879). Nématode Tetrameridae parasite du Tisserin ''Ploceus aurantius'' au Togo|journal=Annales de Parasitologie Humaine et Comparée|volume=61|issue=3|year=1986|pages=321–332|issn=0003-4150|doi=10.1051/parasite/1986613321|pmid=3813418|doi-access=free}} {{open access}}</ref> * ''Tetrameres'' <small>Creplin, 1846</small><!-- RevBrasZool21:961 -->

== References == {{Wikispecies}} {{Reflist}}

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Category:Spirurida Category:Nematode families

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