In synonymy:
Glabropelma Raven, 1985 = Melloina Brignoli, 1985 (Platnick, 1989b: 112)
Melloa Schenkel, 1953 = Melloina Brignoli, 1985 (Brignoli, 1985a: 380, preoccupied, replacement name)

type Melloa gracilis Schenkel, 1953; gender feminine

N.B.: replacement name for Melloa Schenkel, 1953a: 3 [urn:lsid:nmbe.ch:spidergen:04713], preoccupied in Opiliones by Roewer, 1930; transferred from the Theraphosidae to the Paratropididae by Raven, 1985a: 122 and back to the Theraphosidae by Mori & Bertani, 2020: 35; objective senior synonym of Glabropelma Raven, 1985a: 122 [urn:lsid:nmbe.ch:spidergen:04168] (Platnick, 1989b: 112: superfluous replacement name for Melloa).

Melloa gracilis Schenkel, 1953a: 4, f. 4a-c (Dm).
Melloina gracilis Brignoli, 1985a: 380.
Glabropelma gracilis Raven, 1985a: 122, f. 16-17 (m).
Melloina gracilis Raven, 1999: 819, f. 2A-H (m).
Melloina gracilis Goloboff-Szumik & Ríos-Tamayo, 2022: 251, f. 1A-F (Df).

Melloina pacifica Echeverri et al., 2023: 64, f. 11, 12A-E, 13A-B, 14A-E, 15A-C, 16A-C, 17A-F, 18A-E, 19A-C (Dmf).

Melloina rickwesti Raven, 1999: 821, f. 3A-E, 4A-E, 5A-D (Df).

Melloina santuario Bertani, 2013: 102, f. 1-17 (Dmf).