FIGURES 50–58 in New species of Ameletus Eaton, 1885 and redescription of Ameletus longulus Sinichenkova, 1981 from the Russian Far East (Ephemeroptera: Ameletidae)

FIGURES 50–58. Ameletus costalis: male imago: 50. Mesonotum, dorsal view. 51. Tibia of foreleg. 52. Fore wing. 53. Sternum IX, styliger and gonostyli. 54. Genitalia, lateral view. 55. Penis, ventral view. 56. Penis, dorsal view. 57. Penis, lateral view. 58. Subgenital plate, female, dorsal view. Scale (mm): 50=1.0; 52=2.0; 53–58=0.5.