Trichillum elongatum Balthasar
Pedaridium argentinum Arrow, 1913: 459 (valid name)
Pedaridium rugiceps Arrow, 1913: 458 synonymy by Ferreira & Galileo (1993: 24–25) (see comments in Génier & VazdeMello 2002)
Trichillum elongatum Balthasar, 1939: 24 synonymy by Martínez (1987: 60), here confirmed.
Trichillum elongatum Balthasar:
LECTOTYPE here designated: ɗ, on a rectangular card, in NMP. Labels: [1.] ARGENTINA, Cordoba, Stempelmann / [2. red label] TYPUS / [3.] Tr. elongatum m. Dr. V. Balthasar det. / [4. red label] LECTOTYPE / [5.] Trichillum elongatum Balth. LECTOTYPE, VazdeMello det. 200 0 / [6.] Pedaridium argentinum Arrow, VazdeMello det. 200 0. The lectotype is designated in order to fix the name to a single specimen in case more than one species is represented in the type series (the author does not state the total number of specimens in the type series).
PARALECTOTYPES: 2 ΨΨ, pinned, in NMP. Labels: [1.] ARGENTINA, Cordoba, Stempelmann / [2. red label] TYPUS / [3. green label, only with one specimen] elongatum m. / [4. yellow label] PARALECTOTYPE / [5.] Trichillum elongatum Balth. PARALECTOTYPE, VazdeMello det. 200 0 / [6.] Pedaridium argentinum Arrow, Va z d e Mello det. 200 0
Diagnosis and remarks: See Génier & VazdeMello (2002).
New species