Tetrablemma O. Pickard-Cambridge, 1873

Martínez, Leonel, Flórez, Eduardo & Brescovit, Antonio Domingos, 2020, Two new species of the armored spider genus Tetrablemma O. P. - Cambridge, 1873 from northern South America (Araneae: Synspermiata: Tetrablemmidae), Zootaxa 4743 (1), pp. 92-102 : 93

Genus Tetrablemma O. Pickard-Cambridge, 1873

Tetrablemma O. Pickard-Cambridge, 1873: 114 , Type species: T. medioculatum O. Pickard-Cambridge, 1873 .

Diagnosis. The absence of obvious synapomorphies has hampered the delimitation of the genus Tetrablemma ( Lehtinen, 1981; Tong & Li, 2008). According to Tong & Li (2008), Tetrablemma is closely related to Singalangia Lehtinen, 1981 and Rhinoblemma Lehtinen, 1981 ; however, Tetrablemma can be separated from the other two genera by having a distinctive abdominal plate arrangement and well-developed lateral horns of the vulva. Chelicerae of male and female Tetrablemma are dimorphic; males have large and long cheliceral frontal horns, which are less developed and anterolaterally placed in females. Cheliceral horns are also present in Sinamma Lin & Li, 2014 , but this genus can be distinguished by the presence of a tubercle on the male carapace, although this character is also present in T. menglaensis Lin & Li, 2014 ( Lehtinen, 1981; Lin & Li, 2014).