Threefin blenny Threefin blenny Threefin or triplefin blennies are blennioids, small perciform marine fish of the family Tripterygiidae. Found in tropical and temperate waters of the Atlantic, Pacific and Indian Oceans, the family contains about 150 species in 30 genera. The family name derives from the Greek "tripteros" meaning "with three wings". With an elongated, typical blenny form, threefin blennies differ from their relatives by having a dorsal fin separated into three parts (hence the name); the first two are spinous. The small, slender pelvic fins are located underneath the throat and possess a single spine; the large anal fin may have
Pacific leaping blenny members of "A. arnoldorum" are able to thrive on land due to their ability to twist their tails axially at 90 degrees, to propel their bodies. Hsieh noted that the twisting of the tail was a behaviourism unique to "A. arnoldorum" and species in the genus "Andamia"; the two genera were subsequently considered terrestrial. Pacific leaping blenny The Pacific leaping blenny ("Alticus arnoldorum"), also known as the leaping rockskipper, is a species of combtooth blenny (family Blenniidae) in the genus "Alticus". The blennies are oviparous, and form distinct pairs when mating. Males can reach a maximum total length of 8