Flabellum truncum Cairns, 1982: 46, pl. 14, figs. 5–8. — Piñón, 1999: 21, 82 (listed). Truncatoflabellum truncum. — Cairns, Hoeksema & van der Land, 1999: 32 (listed).
Remarks. —This species has been reported only by Cairns (1982) from the continental slope off Isla Desolación (type locality) and off Taltal, Chile (25°– 53°S, 950–1896 m), as well as off Peru (8°S) and the Falkland Plateau (as shallow as 595 m). It is easily recognized by having a basal scar from which it asexually detaches from an attached anthocaulus. Cairns (1989: Table 6) implied that T. truncum was a junior synonym of T. trapezoideum Keller, 1981, the latter known only from the Marcus Necker Ridge at 1630 m, but Cairns et al. (1999) listed them as separate species. Both species are poorly known and should be closely compared when more specimens are available.