Megabranchiella longusa sp. nov., larval morphology A dorsal margin of femur B dorsal view of abdomen C enlargement of abdominal tergites IV–VII D ventral view of abdominal gills I (arrow) E ventral view of gonostyli. Scale bars: 0.1 mm (A); 0.8 mm (B); 0.2 mm (C); 0.4 mm (D); 0.3 mm (E).