? Monostaechas quadridens (McCrady, 1859)

Remarks: Calder et al. (2003:1208) examined Fraser’s material and pointed out that these specimens are “of uncertain identity referable either to Antennella or possibly to Halopteris and not to Monostaechas ”.

Distribution in South America: polyp—Pacific Ocean, Ecuador, at 1.23°S 90.45°W in Isla Floreana (Fraser 1938a; Calder et al. 2003).