Meroplinthus decorus Costa, 1975b: 76

Holotype: 1 ♂. [on red] Holótipo; Sayago, Montevideo, 25–I–1955, A. Silveira; f22; IB; [on red] Meroplinthus decorus C. Costa det. 1975, holótipo.

Conservation status: Good condition.

Paratype: 1 [unknown sex]. Donacion, Tombaxini, 1949; f21; IB; [on red] Meroplinthus decorus C. Costa det. 1975, paratipo.

Conservation status: Good condition.

Paratype: 1 ♀. Rio Grande, 85–4; BM; [on red] Meroplinthus decorus C. Costa det. 1975, holótipo.

Conservation status: Good condition. Genitalia glued on transparent card under specimen. Paratype: 1 [unknown sex]. Pelotas, II. 934, Irmas Figueiredo leg.; BM; [on red] Meroplinthus decorus C. Costa det. 1975, holótipo.

Conservation status: Good condition. Both antennae broken, one glued on card under specimen. Paratype: 1 [unknown sex]. Saimgo, 1948; f23; IB; [on red] Meroplinthus decorus C. Costa det. 1975, holótipo.

Conservation status: Good condition; left antenna broken.