In synonymy:
Cydrelichus Pocock, 1900 = Caesetius Simon, 1893 (Jocqué, 1991a: 113)
Tryssoclitus Simon, 1910 = Caesetius Simon, 1893 (Jocqué, 1991a: 113)

type Caesetius murinus Simon, 1893; gender masculine

N.B.: considered a senior synonym of Cydrelichus Pocock, 1900e: 325 [urn:lsid:nmbe.ch:spidergen:04159] (type C. spenceri Pocock, 1900) and Tryssoclitus Simon, 1910b: 185 [urn:lsid:nmbe.ch:spidergen:04160] (type Caesetius politus Simon, 1893) by Jocqué, 1991a: 113.

Transferred to other genera:
Caesetius arenicola Simon, 1910 -- see Psammoduon
Caesetius canosus Simon, 1910 -- see Psammoduon
Caesetius deserticola Simon, 1910 -- see Psammoduon
Caesetius deserticola Simon, 1910 -- see Psammoduon
Caesetius fagei (Lawrence, 1937) -- see Systenoplacis
Caesetius giltayi (Lessert, 1929) -- see Systenoplacis
Caesetius masculinus Lawrence, 1938 -- see Psammoduon
Caesetius vandami (Hewitt, 1916) -- see Systenoplacis

Tryssoclitus bevisi Hewitt, 1916a: 219, f. 14 (Df).
Caesetius bevisi Lessert, 1936: 232.
Caesetius bevisi Jocqué, 1991b: 85, f. 20 (f).
Caesetius bevisi Dippenaar-Schoeman et al., 2024a: 18, f. 1-4 (f).

Cydrelichus biprocessiger Lawrence, 1952a: 194, f. 22-23 (Dmf).
Caesetius biprocessiger Dippenaar-Schoeman et al., 2024a: 19, f. 1-2 (mf).

Caesetius flavoplagiatus Simon, 1910b: 182 (Df).
Caesetius flavoplagiatus Jocqué, 1991b: 79, f. 8-12 (f, Dm).
Caesetius flavoplagiatus Dippenaar-Schoeman et al., 2024a: 20, f. 1-4 (mf).

Cydrelichus globicoxis Lawrence, 1942: 144, f. 2a-d (Dm).
Caesetius globicoxis Dippenaar-Schoeman et al., 2024a: 21, f. 1-5 (m).

Caesetius inflatus Jocqué, 1991b: 86, f. 21-23 (Dmf).
Caesetius inflatus Dippenaar-Schoeman et al., 2024a: 22, f. 1-8 (mf).

Caesetius murinus Simon, 1893a: 419, f. 385-386.
Caesetius murinus Simon, 1893e: 316 (Df).
Caesetius murinus Jocqué, 1991a: 114, f. 269-275 (f, Dm).
Caesetius murinus Jocqué, 1991b: 76, f. 1-7 (mf).
Caesetius murinus Dippenaar-Schoeman et al., 2024a: 23, f. 1-5 (mf).

Caesetius politus Simon, 1893e: 316 (Dj).
Tryssoclitus politus Simon, 1910b: 185.
Caesetius politus Jocqué, 1991b: 82 (T from Tryssoclitus; N.B.: probably a nomen dubium).
Caesetius politus Dippenaar-Schoeman et al., 2024a: 24 (probably nomen dubium).

Cydrelichus rosei Bacelar, 1953: 2, f. 1-3 (Dm).

Caesetius schultzei Simon, 1910b: 183 (Df).
Caesetius schultzei Jocqué, 1991a: 114, f. 251, 276 (f).
Caesetius schultzei Jocqué, 1991b: 82, f. 15-19, 31 (f, Dm).
Caesetius schultzei Dippenaar-Schoeman et al., 2024a: 25, f. 1-6 (mf).

Cydrelichus spenceri Pocock, 1900e: 325 (Djf).
Caesetius spenceri Jocqué, 1991b: 81, f. 13-14 (T from Cydrelichus).