List of grasshoppers, crickets, bush-crickets, mantids and stick insects, which have not been recorded for several decades
During the process of red list assessments, the Grasshopper Specialist Group identified a couple of species, which have not been recorded for a very long time. These species are usually considered as "possibly extinct". Intensive searches for these species are necessary to confirm their survival. The list below is a short summary of our current knowledge concerning such possibly extinct species. It is far from complete and based upon the species, which have recently been assessed. In a number of cases, it is quite likely that the species still exists, but no searches have been performed. These are also listed!
The Gran Canaria Bush-cricket, Evergoderes cabrerai: This species has not been recorded since the mid 1960s. It is only known from one locality (Barranco de Agaete, Gran Canaria, Spain). Recent research on Orthoptera in this area did not result in any records (López unpubl.), but it might be nocturnal and/or arboricolous and, therefore, difficult to find. In summer 2013 a comprehensive mapping study on Calliphona alluaudi (the Gran Canaria Green Bush-cricket) was done on Gran Canaria (Miller unpubl.). During this study, it was also searched for its relative, Evergoderes cabrerai, but again without success.
The Seychelles Slender Ground-hopper, Procytettix fusiformis: This species has not been found since it has been described in 1909. The type specimens have been collected on Mahé (Seychelles) in the cloud forests ("Morne Pilot"). The species has been found in the leave litter. It is well camouflaged and might thus be overlooked. The number of specific studies on Orthoptera on the Seychelles is rather limited, but a specific search for this species in August 2013 (funded by the Mohamed Bin Zayed Species Conservation Fund) remained unsuccessful.
The Karpathos Stone Grasshopper, Orchamus kaltenbachi: This large and impressive grasshopper species is only known from a single male collected in 1935. The species has been recorded from Mount Lastos on Karpathos. Despite their large body size, stone grasshoppers (Pamphagidae) are difficult to find due to their excellent camouflage (stone-like appearance). Their songs are also very silent and not useful for monitoring.
The Uluguru Slender Grasshopper, Acanthoxia aculeus: This grasshopper species is only known from two localities at the northwestern slopes of the Uluguru Mts (Tanzania). The species has not been located since 1964, but no thorough searches have been conducted.
The Usambara Slant-faced Grasshopper, Acrida bara: This species has not been recorded since its description in 1963. It is only known from Lushoto (West Usambara Mts., Tanzania). However, the genus Acrida is in need of taxonomic revision.
The Usambara Burrowing Grasshopper, Acrotylus apicalis: A band-winged grasshopper, which has not been found since 1908, but no thorough searches have been undertaken.
The South-East African Burrowing Grasshopper, Acrotylus mossambicus: Another band-winged grasshopper, which has not been located since 1946. The known localities are from South Africa, Zimbabwe, Mozambique and Tanzania. The genus Acrotylus is in need of taxonomic revision.
The Usambara Splendid Grasshopper, Anischnansis burtti: This species has not been found since 1966 despite searches. It is only known from two localities close to the East Usambara Mountains in Tanzania (Sigi near Amani and Mlingano).
The Wembere Grasshopper, Aulacobothrus popovi: This species is only known from one locality (Wembere valley, Usenji Ngurore in Tanzania). It has not been recorded sicne the type specimens have been collected in 1973.
The Skaronero Marbled Bush-cricket, Eupholidoptera gemellata: This species has not been confirmed since the type has been collected in 1973 despite a specific search for it. The species is only known from Mt. Ida on Crete. Since other Eupholidoptera species occur at the same site, it might have been overlooked.
The Pale-legged Marbled Bush-cricket, Eupholidoptera pallipes: This species is also known from a single locality on Crete (Lefka Ori), where it has been found only once.
The Tabora Grasshopper, Catantops tanganus: This species has been documented from a number of localities in West Tanzania (the region south of Laka Victoria, east of Burundi, north of Lake Rukwa and west of Singida). Most records stem from collections by Burtt (1930s-1950s) and N. Jago (1964). It is very likely that the species still occurs in the region, because it is probably not highly specialized in its habitat preferences. Similar to other Catantops species it is probably affiliated to savanna or miombo woodland.
The Ufipa Flightless Forest Grasshopper, Chromochokwea fitzgeraldi: Only the type specimen of this species is known. It has been collected during an excursion in 1952 by Uvarov and Vesey-Fitzgerald and described one year later. The type locality was a "ravine with dense matted grass" on the Ufipa plateau - but the exact location remains unknown.
The Iringa Splendid Grasshopper, Eupropacris uniformis: This grasshopper species is known from the western slopes of the Udzungwa Mountains (near Iringa, Uhehe) and Ubena. The last records are from 1931 by W. V. Harris (Dabaga, Iringa). No specific searches for this species have been done since that time.
The Kibariani Mountain Grasshopper, Eyprepocnemis reducta: This species is only known from two localities near Mpwapwa, Tanzania (Kibariani, Mt. Wilkins). The only known species have been collected by Dr. E. Burtt in 1938 and 1947. No searches for this species have been done since this time.
This site will be continuously updated during the process of red list assessments.