Perizoma is a genus

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...

 in the geometer moth

Geometer moth

The geometer moths or Geometridae are a family of the order Lepidoptera...

 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...

 (Geometridae). It is the type genus

Type genus

In biological classification, a type genus is a representative genus, as with regard to a biological family. The term and concept is used much more often and much more formally in zoology than it is in botany, and the definition is dependent on the nomenclatural Code that applies:* In zoological...

 of tribe

Tribe (biology)

In biology, a tribe is a taxonomic rank between family and genus. It is sometimes subdivided into subtribes.Some examples include the tribes: Canini, Acalypheae, Hominini, Bombini, and Antidesmeae.-See also:* Biological classification* Rank...

 Perizomini

Perizomini

Perizomini is a tribe of geometer moths under subfamily Larentiinae.-References:*...

 in subfamily Larentiinae

Larentiinae

Larentiinae moths contain roughly 5,800 species and occur mostly in the temperate regions of the world. They are generally considered a subfamily of the geometer moth family and divided into a few large or good-sized tribes, and numerous very small or even monotypic ones which might not always be...

. The tribe is considered 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...

 by those who include the genera Gagitodes

Gagitodes

Gagitodes is a genus of moth in the family Geometridae. It is considered a synonym of Perizoma by some authors.-Selected species:* Gagitodes omnifasciaria * Gagitodes parvaria...

, Martania

Martania

Martania is a genus of moth in the family Geometridae. It is sometimes included in Perizoma.-Selected species:Species include:* Martania fulvida * Martania minimata * Martania saxea...

and Mesotype

Mesotype

Mesotype is a genus of moth in the family Geometridae. It is sometimes included in Perizoma.Species include:* Mesotype didymata – Twin-spot Carpet* Mesotype parallelolineata* Mesotype verberata -References:*...

in Perizoma. Some other less closely related species formerly placed here are now elsewhere in the Larentiinae, e.g. in Entephria

Entephria

Entephria is a genus in the geometer moth family . There is no unambiguous common name for these moths; like many other members of their subfamily Larentiinae, they are called "carpets"....

of the tribe Larentiini

Larentiini

Larentiini is a tribe of geometer moths under subfamily Larentiinae.-Recognized genera:* Anticlea* Antilurga* Ennada* Entephria* Herbulotina Pinker, [1971]* Idiotephria* Kuldscha* Kyrtolitha* Larentia...

.

Either way, there are more than 150 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...

 of Perizoma currently known, with a generally Northern Hemisphere

Northern Hemisphere

The Northern Hemisphere is the half of a planet that is north of its equator—the word hemisphere literally means “half sphere”. It is also that half of the celestial sphere north of the celestial equator...

 distribution (e.g. 14 occurring in Europe

Europe

Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

), and new ones still being described occasionally. Many of them are called rivulets ("the" rivulet is P. affinitata

Perizoma affinitata

The Rivulet is a species of moth of the Geometridae family. It is found in most of Europe.Its wingspan is 24-30 mm. There are two generations per year with adults on wing from the beginning of May to September....

specifically), while others are known as "carpets", a common name for Larentiinae in general.

One of its junior synonyms is Emmelesia, proposed by J.F. Stephens

James Francis Stephens

James Francis Stephens was an English entomologist.-Biography:Stephens was born in Shoreham-by-Sea and studied at Christ's Hospital.He was employed in the Admiralty office, Somerset House, from 1807 to 1845...

 no less than three times – once validly in 1829, and within the next two years twice more invalidly. Another invalid name of Perizoma – Opisogonia, chosen by G.A. Herrich-Schäffer

Gottlieb August Wilhelm Herrich-Schäffer

Dr Gottlieb August Wilhelm Herrich-Schäffer was a German entomologist and physician. He was born, and died, in Regensburg. Herrich-Schäffer studied and collected particularly butterflies and moths...

 in 1856 – had already been used by the same author the year before for a different geometer moth genus

Opisogonia

Opisogonia is a genus of moth in the family Geometridae.-References:*...

.