Polydiscia deuterosminthurus
Encyclopedia
Polydiscia deuterosminthurus is a species of mite
Mite
Mites, along with ticks, are small arthropods belonging to the subclass Acari and the class Arachnida. The scientific discipline devoted to the study of ticks and mites is called acarology.-Diversity and systematics:...

 recently discovered in the autonomous community of Navarre
Navarre
Navarre , officially the Chartered Community of Navarre is an autonomous community in northern Spain, bordering the Basque Country, La Rioja, and Aragon in Spain and Aquitaine in France...

 in Spain
Spain
Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

.

Only the six-legged larva
Larva
A larva is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle...

l stage is so far known. This lives as a parasite on the springtail
Springtail
Springtails form the largest of the three lineages of modern hexapods that are no longer considered insects...

 Deuterosminthurus bisetosus
Deuterosminthurus bisetosus
Deuterosminthurus bisetosus is a species of springtail discovered recently living on the broom Genista hispanica in the autonomous community of Navarre in Spain....

, which was discovered at the same time as the parasite. The association between the two species only seems to last for a few weeks in May and June. Both creatures appear to be entirely restricted to a single host plant at this stage of their life cycle: the broom
Broom (shrub)
Brooms are a group of evergreen, semi-evergreen, and deciduous shrubs in the subfamily Faboideae of the legume family Fabaceae, mainly in the three genera Chamaecytisus, Cytisus and Genista, but also in many other small genera . All genera in this group are from the tribe Genisteae...

 Genista hispanica.

These red mites are tiny, less than 0.3 mm in length but are huge in comparison to their hosts, averaging a third of the length of Deuterosminthurus bisetosus, to which they attach piggyback-fashion, the jaws embedded in the joint between head and prothorax
Prothorax
The prothorax is the foremost of the three segments in the thorax of an insect, and bears the first pair of legs. Its principal sclerites are the pronotum , the prosternum , and the propleuron on each side. The prothorax never bears wings in extant insects, though some fossil groups possessed...

. The remainder of the life cycle of this mite remains a total mystery.
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