Acrochaetium gracile Børgesen, 1915: 26–27, figs. 19, 20 (type locality: St. Thomas, Virgin Islands).—Umamaheswara Rao & Sreeramulu, 1964: 599.— V. Krishnamurthy & H. Joshi, 1970: 16.— Untawale, Dhargalkar, & Agadi, 1983: [26].— Desikachary, V. Krishnamurthy, & M. Balakrishnan, 1990: 62–63, figs. 8D,E.
Audouinella gracilis (Børgesen) Jaasund, 1977c: 415 (`gracile').—Lawson, 1980: 34.
INDIAN OCEAN DISTRIBUTION: India, Tanzania.
Note: When first published (Jaasund, 1976: 61, fig. 122), the combination Audouinella gracilis was invalid since its author did not cite the basionym and thus failed to satisfy Art. 33.2.