Spiders of this genus grow up to 5 cm in length and are brownish to blackened, with a ''zebra'' coloring on the abdomen, with clear transverse bands. The lyre is composed of rigid bristles of different sizes. They are spiders of fossorial and nocturnal habits, found in tunnels dug in ravines and on top of logs or rocks in the forest. This species is very common in the Atlantic forest.[citation needed]
Venom
Studies show that the venom of T. venosa is more potent than that of the Brazilian yellow scorpion (Tityus serrulatus).[citation needed] There have been few recorded accidents, possibly caused by T. rufa.[5]
The venom of T. venosa has a lethal dose of 0.070 mg for 20 grams rat by subcutaneous injection, and 0.030 mg by intravenous injection, 2 mg by intramuscular injection results in muscle contractions, paralysis and death in rats, while 0.4 mg results in death by tetanism, for pigeons, the lethal dose ranges from 0.01-0.007 mg, by intravenous injection. The average yield is 1.00 mg, and the maximum is 1.70 mg.[6][7]
Species
As of November 2024[update] it contains 9 species, all found in Brazil:[1]
^ abcGloor, Daniel; Nentwig, Wolfgang; Blick, Theo; Kropf, Christian (2024). "Gen. Trechona C. L. Koch, 1850". World Spider Catalog Version 25.5. Natural History Museum Bern. doi:10.24436/2. Retrieved 2024-11-08.
^Raven, R. J. (1985). "The spider infraorder Mygalomorphae (Araneae): Cladistics and systematics". Bulletin of the American Museum of Natural History. 182: 75.
