Currently, only one species, Trichoplax adhaerens, is acknowledged to belong to the Placozoa. The Italian Francesco Saverio Monticelli described another species in 1893, which he found in the waters around Naples, naming it Treptoplax reptans.
A standard mallet has a head length of 9 to 9.5, and this is recommended for beginners. Expert players may use longer head lengths up to 12, as this is thought to make aiming more accurate and makes it harder to accidentally twist the mallet during the stroke.
A child of 9+ years old, or even a large-sized younger child, may find the grip too small and need an adult racket. If the grip is correct for the child, you should be able to slide a finger up the middle of his finger tips. Racquet sizes range from 21 inches for a 3 or 4 years old to 26 inches for a 10 year old.Once a child hits about 5 feet tall they should move on to the 27 inch adult racket. Make sure the racket isnât too heavy, or else your child wonât want to hold it or swing it around for long. A light weight racket is best.f the grip is correct for the child, you should be able to slide a finger up the middle of his finger tips. Racquet sizes range from 21 inches for a 3 or 4 years old to 26 inches for a 10 year old. Once a child hits about 5 feet tall they should move on to the 27 inch adult racket.