sentences:  It is a sister species to "Sphyrna gilberti", differing by the number of vertebrae.Though once considered a distinct species, McEachran and Serret synonymized "Sphyrna couardi" with "Sphyrna lewini" in 1986.On average, males measure and weigh about when they attain sexual maturity, whereas the larger females measure and weigh on average at sexual maturity.