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The Registry of World Record Size Shells is a conchological work listing the largest (and in some cases smallest) verified shell specimens of various marine molluscan taxa.A successor to the earlier World Size Records of Robert J. L. Wagner and R. Tucker Abbott, it has been published on a semi-regular basis since 1997, changing ownership and publisher a number of times.
This is the largest extant snail (shelled gastropod) species in the world, and arguably the largest (heaviest) gastropod in the world. Although the shell itself is quite well known to shell collectors because of its extraordinary size, little is known about the ecology and behavior of the species, [7] except for one study about its feeding habits.
The largest known T. gigas specimen measured 137 centimetres (4 ft 6 in), and it weighed 230 kg (510 lb) dead and was estimated to be 250 kg (550 lb) alive. It was discovered around 1817 on the north western coast of Sumatra, Indonesia, and its shells are now on display in a museum in Northern Ireland. [6]: 31 [15]
The largest shell-less gastropod is the giant black sea hare (Aplysia vaccaria) at 0.99 m (3.2 ft) in length and almost 14 kg (31 lb) in weight. The largest of the land snails is the giant African snail (Achatina achatina) at up to 1 kg (2.2 lb) and 35 cm (14 in) long. Cephalopods (Cephalopoda) (See Cephalopod size.)
The largest known specimen of Triplofusus giganteus had a shell 604.8 millimetres (23.81 in) long. [6] However, populations have declined in size in recent years due to overharvesting; the largest individuals observed in various recent surveys have had shells ranging from 341 to 400 millimetres (13.4 to 15.7 in). [7]
The shell of Pecten maximus is quite robust and is characterised by having "ears" of equal size on either side of the apex. The right, or lower, valve is convex and slightly overlaps the flat left, or upper, valve. Larger specimens have a nearly circular outline and the largest may measure 21 cm in length.
For a discussion of maximum shell size in this species, see Finn (2013:199). The largest literature record (and the only one to exceed the official world record size) appears to be the rough upper limit of 12 in (304.8 mm) given by Webb (1945:13) for the species as a whole (Finn, 2013:199).
Limax maximus (literally, "biggest slug"), known by the common names great grey slug and leopard slug, is a species of slug in the family Limacidae, the keeled slugs. [4] It is among the largest keeled slugs, Limax cinereoniger being the largest. Limax maximus is the type species of the genus Limax. The adult slug measures 10–20 cm (3.9–7.9 ...