Diplogasterida
Encyclopedia
Diplogasterida is 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 nematode
Nematode
The nematodes or roundworms are the most diverse phylum of pseudocoelomates, and one of the most diverse of all animals. Nematode species are very difficult to distinguish; over 28,000 have been described, of which over 16,000 are parasitic. It has been estimated that the total number of nematode...

s. It is sometimes placed in a monotypic
Monotypic
In biology, a monotypic taxon is a taxonomic group with only one biological type. The term's usage differs slightly between botany and zoology. The term monotypic has a separate use in conservation biology, monotypic habitat, regarding species habitat conversion eliminating biodiversity and...

 subclass
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...

 Diplogasteria, but as it seems it is better included in the Rhabditia
Rhabditia
Subclass Rhabditia is mostly composed of parasitic nematodes , though there are some free-living species as well...

. If the Tylenchida
Tylenchida
Tylenchida is an order of nematodes.- List of families :* Superfamily Criconematoidea** Criconematidae** Tylenchulidae* Superfamily Tylenchoidea** Anguinidae ** Belonolaimidae** Dolichodoridae** Ecphyadophoridae** Hoplolaimidae...

are included in the Rhabditia, the Diplogasterida certainly would have to be merged there too
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