type Walckenaeria ludicra O. Pickard-Cambridge, 1861; gender neuter

In synonymy:
Peponocranium miser (O. Pickard-Cambridge, 1882, T from Walckenaeria) = Peponocranium ludicrum (O. Pickard-Cambridge, 1861) (Smith, 1906: 312).
Peponocranium penultimum (O. Pickard-Cambridge, 1882) = Peponocranium ludicrum (O. Pickard-Cambridge, 1861) (Smith, 1906: 312).

Peponocranium dubium Wunderlich, 1995e: 499, f. 85-89 (Dm).

Peponocranium fallax Gnelitsa, 2024: 191, f. 11-13, 16-17 (Df).

Walckenaera ludicra O. Pickard-Cambridge, 1861a: 438 (Dmf).
Walckenaera ludicra Blackwall, 1864a: 316, pl. 22, f. 231 (mf).
Lophocarenum ludicrum Bertkau, 1880b: 304.
Walckenaera penultima O. Pickard-Cambridge, 1882a: 7, pl. 1, f. 4 (Dm) [urn:lsid:nmbe.ch:spidersp:012326].
Walckenaera miser O. Pickard-Cambridge, 1882a: 9, pl. 1, f. 7 (Df) [urn:lsid:nmbe.ch:spidersp:061222].
Peponocranium ludicrum Simon, 1884a: 687, f. 545-547 (mf).
Peponocranium penultimum Simon, 1884a: 689.
Peponocranium ludicrum Simon, 1894a: 655, f. 677 (m).
Peponocranium ludicrum Smith, 1901a: 334, f. 1v, p. 359: f. 1a (m).
Peponocranium ludicrum Bösenberg, 1902: 215, pl. 19, f. 303 (mf).
Peponocranium ludicrum Smith, 1906: 312 (S of Peponocranium orbiculatum, P. penultimum and Walckenaeria miser; P. orbiculatum revalidated by Wiehle, 1960a: 303).
Peponocranium ludicrum Simon, 1926: 332, 478, f. 553 (f, S of Peponocranium orbiculatum confirmed, S of P. penultimum and Walckenaeria miser doubted, both confirmed by Bristowe, 1941: 521, 524; P. orbiculatum revalidated by Wiehle, 1960a: 303).
Peponocranium ludicrum Fage & Simon, 1936: 321, f. 13f (f).
Peponocranium ludicrum Bristowe, 1941: 521, 524 (S of Peponocranium penultimum and Walckenaeria miser confirmed).
Diastanillus penultimus Roewer, 1942a: 699.
Peponocranium ludicrum Roewer, 1942a: 674 (S of Walckenaeria miser accepted).
Peponocranium ludicrum Locket & Millidge, 1953: 234, f. 142A-D (mf).
Peponocranium ludicrum Tullgren, 1955: 345, f. 48 (f).
Peponocranium ludicrum Wiehle, 1960a: 308, f. 562-571 (mf).
Peponocranium ludicrum Merrett, 1963b: 444, f. 126 (m).
Peponocranium ludicrum Palmgren, 1976: 92, f. 9.6-10 (mf).
Peponocranium ludicrum Millidge, 1977: 19, f. 62 (m).
Peponocranium ludicrum Roberts, 1987: 54, f. 20c, 21a (mf).
Peponocranium ludicrum Heimer & Nentwig, 1991: 232, f. 623 (mf).
Peponocranium ludicrum Esyunin, Efimik & Polyanin, 1995: 64, f. 12-13 (f).

Walckenaera orbiculata O. Pickard-Cambridge, 1882b: 260, pl. 13, f. 2 (Dm).
Peponocranium orbiculatum Simon, 1884a: 689.
Peponocranium orbiculatum Dahl, 1886: 101 (Df).
Peponocranium orbiculatum Bösenberg, 1902: 214, pl. 19, f. 302 (mf).
Peponocranium ludicrum Miller, 1943: 23, pl. III, f. 6 (m, misidentified).
Peponocranium ludicrum Miller, 1947: 62, pl. 4, f. 7-8 (mf; misidentified per Wiehle, 1960a: 303).
Peponocranium orbiculatum Wiehle, 1960a: 303, f. 553-561 (mf, removed from S of Peponocranium ludicrum, contra Smith, 1906: 312 and Simon, 1926: 479).
Peponocranium orbiculatum Miller, 1971: 258, pl. LII, f. 16-18 (mf).
Peponocranium orbiculatum Hänggi, 1989: 170, f. 2a-b (mf).
Peponocranium orbiculatum Tanasevitch, 1990: 103, f. 21.22, 23.5, 24.8 (mf).
Peponocranium orbiculatum Heimer & Nentwig, 1991: 232, f. 624 (mf).
Peponocranium orbiculatum Esyunin, Efimik & Polyanin, 1995: 64, f. 14-15 (f).

Peponocranium praeceps Miller, 1943: 23, pl. III, f. 1-5 (Dm).
Peponocranium praeceps Miller, 1947: 62, pl. IV, f. 9-13, pl. XV, f. 12-16 (m, Df).
Peponocranium praeceps Miller, 1971: 258, pl. LII, f. 19-21 (mf).
Peponocranium praeceps Palmgren, 1976: 92, f. 9.11-13 (mf).
Peponocranium praeceps Schikora, 2015: 215, f. 10.302-305 (mf).
Peponocranium praeceps Jacquet & Oger, 2021: 12, f. 1A-D, 2A-F (mf).
Peponocranium praeceps Gnelitsa, 2024: 194, f. 14-15, 19 (f).

Peponocranium simile Tullgren, 1955: 346, f. 49a-b (Df).