Proutista Fritillaris

''Proutista'' is a small genus of planthoppers from the family Derbidae, tribe Zoraidini, with 10 species, as of 2024. The type species, ''Proutista moesta'' is widely distributed and often very common, its distribution ranging from Tanzania in Africa, over some Indian Ocean islands (Seychelles, Maldives) and southern parts of western Asia (India, Sri Lanka) to far eastern Asia (China, Taiwan, Japan) and parts of the western Pacific (Philippines, Guam, Palau, Indonesia, Papua New Guinea). Seven of the remaining species are also found in tropical parts of Asia and only two additional species have been recorded from Africa, where ''Proutista fritillaris'' is the most common one. The species of ''Proutista'' are characterized by a combination of different features, mainly the shape and venation of the forewings, the size of the hind wings and the structure of the head and the antennae. On the forewings the media vein has 6 branches, none of them branching further into sub branches. The hind wings are about half as long as the forewings and have a rounded tip. The head has a narrow face (frons) and the antennae are rather short, much shorter than the face.

Type species: ''Assamia dentata'' Buckton, 1896, a synonym of ''Proutista moesta'' (Westwood, 1851)

Distribution

Species of the genus ''Proutista'' are found in tropical parts of Africa, Asia and the western Pacific, as well as in some subtropical parts of eastern Asia. The distribution of ''Proutista moesta'', the type species ranges from Tanzania in eastern Africa over the Seychelles and the Maldives in the India Ocean to India and Sri Lanka. The only record from Africa possibly represents a new introduction. Further east, ''Proutista moesta'' has been reported from southern parts of mainland Asia (Bangladesh, Malaysia, Thailand, Vietnam, China) and from various islands in western parts of the Pacific, including Indonesia, the Philippines, Taiwan, Japan, Guam, Palau and New Guinea. Apart from ''Proutista moesta'', 7 other species of ''Proutista'' have been described from Asia and the western Pacific, but none of them is common. Only two additional species are known from Africa, with ''Proutista fritillaris'' being common and widespread in tropical parts of western Africa (Sierra Leone, Guinea, Togo, Ivory Coast, Central African Republic, Cameroon, Nigeria, Democratic Republic of the Congo) and some parts of eastern Africa (Malawi, Uganda, "Sudan", Tanzania).

Description

Species of ''Proutista'' can be recognized by a combination of different characters:
* On the forewings, the media vein has 6 branches with none of them forking further into sub branches.
* The hind wings are about half as long as the forewings and have a rounded tip.
* The head is much narrower than the thorax, has a narrow face (frons), a flat profile, 2 ocelli and short antennae with the last antennal segment less than twice as long as wide.
* The forewings often have a club-shaped outline with the basal third being unusually narrow and the distal part being unusually broad.

Compared to other genera of the tribe Zoraidini, species of ''Proutista'' are small. The body from head to the end of the abdomen is around 2.5 to 3.0 mm long and the forewings have a length of 6 to 8 mm. Males are smaller than females. The two most common species, ''Proutista moesta'' in Asia and ''Proutista fritillaris'' in Africa are predominantly black with the legs and some parts of the body straw-coloured. The wings are also mainly black, interrupted by light patches which can give them a checkered appearance. However, other species like ''Proutista wilemani'' from Taiwan or ''Proutista javensis'' from Java are lighter. Available images of live specimens (''Proutista moesta'' and ''P. fritillaris'') suggest that when ''Proutista'' species are at rest, their forewings are raised above the body and spread out at an angle of about 60°.

Biology and impact

In general, immature stages of insects from the family Derbidae are associated with decaying organic matter like rotting wood, where they feed on fungi. For species of ''Proutista'', information on their breeding habitats is rare, but immatures of ''Proutista moesta'' have been reported from oil palm bunch waste. The adults of ''Proutista moesta'' have been recorded from a number of different host plants with palm trees like coconut and oil palms being cited most often. However, sugarcane and maize have also been reported as hosts.

''Proutista moesta'' can be very common and is often cited as an agricultural pest of oil palms and sugarcane. It is also regarded as a vector of coconut diseases causes by phytoplasmas, based on the presence of the disease agents inside the insects. In Australia, it is regarded as a biosecurity risk. However, there does not seem to be any information on the direct effects the feeding activities of the insect has on growth or yield of the host plants.

Taxonomy and species

The genus ''Proutista'' was original described by Buckton in 1896 as ''Assamia'' with the type species ''Assamia dentata'' from Assam, India. In 1903, Melichar stated that ''Assamia dentata'' is a synonym of ''Derbe'' (''Phenice'') ''moesta'' Westwood, 1851 which had been described from "India orientali". In 1904, Kirkaldy renamed ''Assamia'' Buckton as ''Proutista'', since the name ''Assamia'' was preoccupied.

In 1906, Kirkaldy described a new genus which he named ''Sardis'', with ''Phenice maculosa'' Krueger, 1897 from Java, Indonesia as the type species. As part of this description he also described and illustrated an insect from Queensland, Australia which he believed to be ''Phenice maculosa'', but stating that he had not seen Krueger's "original work". One year later, he realized that the described and illustrated specimen from Australia was not ''Phenice maculosa'' and that:
* ''Phenice maculoca'' Krueger, 1897 is a synonym of ''Proutista moesta'' Westwood, 1851.
* The genus ''Sardis'' is consequently a synonym of ''Proutista''.
* The specimen from Australia he described and illustrated as ''Phenice maculoca'' is a different species which he named ''Proutista lumholtzi''. This species is now known as ''Lydda lumholtzi'' (Kirkaldy, 1907).

The following 3 genera in the tribe Zoraidini are most similar to the genus ''Proutista'', among others they all have 6 media veins on the forewing which do not fork further:
* ''Shizuka'' Matsumura, 1914, a small genus in eastern Asia, which differs from ''Proutista'' mainly by its longer antennae and the course of the cubitus vein on the forewing.
* '' Lydda'' Westwood, 1840 which has a wider head, about as wide as the thorax, and shorter hind wings.
* ''Diostrombus'' Uhler, 1896 which differs by the hind wings being shorter and having a pointed tip.

Currently (2024), 10 species are placed in the genus ''Proutista''. The most common ones are:
*''Proutista fritillaris'' (Boheman 1838)
*'' Proutista furcatovittata'' (Stål, 1855)
*''Proutista moesta'' (Westwood, 1851)

References

{{Taxonbar, from1=Q10641222

Proutista
Taxa described in 1904
Auchenorrhyncha genera
Zoraidini
Hemiptera of Asia
Hemiptera of Africa
Taxa named by George Willis Kirkaldy