Grammonus longhursti (Cohen, 1964)

SMNS 24200 (1 specimen), 25236 (2 specimens). A wide channel, 6 m deep, transverses Santana Islet. On the seaward side of this channel, a small cave extends about 8 m into the rock. Five individuals of an unidentified bythitid were observed in this cave (Figure 6). J. Nielsen of the Zoologisk Museum, University of Copenhagen identified the three collected specimens as Grammonus longhursti . This species was previously known only from the type series from Nigeria. The presence of this fish species at São Tomé island was briefly mentioned in a paper on shrimps from São Tome and Príncipe (Wirtz, 2004).