PHALLOSTETHIDAE Neostethus lankesteri, 2.2 cm SL (photo by Koichi Shibukawa) Neostethus lankesteri Regan, 1916 One-horned Priapiumfish D II+6-7; A 16-17; P1 11-12; LR 31-32. Body slender and compressed; in adult male, first ctenactinium very long with a triangular ventral projection, whereas second ctenactinium very short and not obvious externally; in female, distinct hook-like flap between anus and urogenital opening under throat. Head without translucent membranous dome on dorsal surface. Color: semitransparent, rapidly turns to pale after death. Size: 3 cm. Distribution: Andaman Sea and Western Pacific. Remarks: found in quiet waters around aquatic plants in mangroves. Surface swimming, schooling fish. Oviparous.