According to Ragge (1962), the genera Drepanophyllum Karsch, 1890, Stenamblyphyllum Karsch, 1896, Debrona Walker, 1870, and Tetraconcha Karsch, 1890 are a fairly well-defined group of African Phaneropterinae, in which the fore tibiae are biconchate and the fastigium of the vertex has a steeply sloping or vertical sulcus.
Additionally, a series of other specimens of Tetraconcha collected by Marios Aristophanous, Philippe Moretto and Enrico Ruzzier for the British Museum of Natural History in the Ivory Coast in 2014-2015 was obtained on loan; this material provided another two undescribed species.
Material examined (other than Tetraconcha).--Stenamblyphyllum dilutum Karsch, 1896: Cameroon, Victoria (lectotype [female]) (MfN); Cameroon (1[female]) (MCNM); Central African Republic, Dzanga-N'Doki National Park, Sangha 15.X.2008, P.
According to Karsch (1890a), Othiaphysini (including Debrona and Tetraconcha) are characterised by undulate veinlets on the tegmina, fore tibiae with both conchate tympana, armed fore and mid femora, and short ovipositors as in Ephippithytae with crenulate upper margins.
Drepanophyllum and Stenamblyphyllum species occur in central Africa, while Tetraconcha is restricted to central and western Africa.
The name Tetraconcha derives from the conchate tympana (from Greek tetra = four).
fenestrata is the type species of the genus Tetraconcha. The ratio length/width tegmina in males is between 3.5 and 3.6, in females it is between 2.6 and 3.4 (Bolivar 1906; present study).
banzyvilliana on a female, he established to include the species of Tetraconcha with long and thin legs to the subgenus Tellidia.
Etymology.--This species is gratefully named after the French colleague Philippe Moretto, who collected a long series of specimens of Tetraconcha and other interesting species from the Central African Republic and the Ivory Coast.
Characters of females of the genus Tetraconcha (Figs 79-85)
The genus Tetraconcha is known for its high sexual dimorphism.
The eggs oi Tetraconcha are similar to those of the genus Phlaurocentrum Karsch, 1889 (Massa 2013).