Paryphanta busbyi is a species of large predatory land snail, a terrestrial pulmonate gastropod mollusk in the family Rhytididae. Distribution The distribution of Paryphanta busbyi includes the Northern parts of North Island, New Zealand: Kaitaia, Hokianga, Mangōnui, Bay of Islands, Otonga East, Mania Hill, Whangārei, Brynderwyn Range, Hen Island, Woodcocks and Warkworth, which is its southern native distribution. Localitions with introduced distribution include Little Huia in Waitākere Ranges, Waiuku in Āwhitu Peninsula, and Kaimai Ranges. Its distribution is coincident in range with the kauri forest. The type locality is New Zealand. The type specimen is stored in Natural History Museum, London. Shell description The shell is large, broadly umbilicated, depressed and subdiscoidal. The shell is opaque and shining. The colour is deep green, usually with some radial streaks of blackish-green. There is a sculpture on the nucleus containing oblique and arcuate radial plaits. The succeeding two whorls are distinctly rugose. On the post-embryonic whorls more or less distinct spiral cords appear, which are first directed upwards, but become spiral on the last whorl. Plaits are distant, low, broadly rounded, varying in number from about 5 to 10 and absent on the base. There are retractive distant growth-plications, which are prominently and closely plicate at the suture. The whole surface of the shell is microscopically decussated by exceedingly fine and dense radiate and spiral lines, the latter slightly wavy. The periostracum is thick, glabrous, shining, overhanging the peristome. The spire is flat, very little raised and broadly convex. The protoconch has 2 whorls, flatly convex, the volutions rather rapidly increasing. The shell has 4½ whorls, that are rapidly increasing. The last whorl is very large, slightly convex, periphery and base rounded, the body-whorl more or less deflexed anteriorly. Suture well impressed. The aperture is within shining-blue. Aperture obliquely lunate-oval. Peristome is simple, inflexed throughout. The columella is very oblique, slightly arcuate, and shortly reflexed above. Umbilicus broad, perspective and deep. The width of the shell is 60–79 mm. The height of the shell is 33–44 mm. The width of the type specimen is 66 × 53 mm, the height of the shell is 29 mm. The shell of Paryphanta busbyi has very thick periostracum and only few micrometre thick calcium layer. When the shell is kept in dry environment, the shell will explode into pieces, because its periostracum shrinks. The embryonic shell globose, flat above, of 2 whorls, narrowed toward the