1970
Hindella extenuata sp. nov. — Rubel, pp. 48-50, fig. pl. 25; pl. 26: 12-16, text-figs 15-17
1984
"Hindella" extenuata Rubel, 1970 — Rubel et al., pp. 29
1985
Koigia extenuata (Rubel, 1970) — Modzalevskaya, pp. 37-39, fig. pl. 12: 1-10; text-fig. 30-31
2002
Koigia extenuata (Rubel, 1970) — Alvarez & Rong, pp. 1566, fig. gif. 1067, 1a-dd