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Known from fossil evidence about 400,000 years old, it is one of many glacial relict species that remain in the Driftless Area, a glacier-eroded plateau that now makes up parts of Iowa, Illinois, Minnesota, and Wisconsin. Much of the area was covered by glaciers about 500,000 years ago, while parts of the Driftless Area were unglaciated.
Fossils of this extinct land snail species are known only from the Late Pliocene/Waipipian (~3.6–3.0 Ma) MÄngere Shellbed, located approximately 30 m below the suburb of Mangere, Auckland. [ 1 ] [ 3 ] It is currently regarded as one of the two oldest known flax snails species represented in the fossil record, along with a single specimen of ...
The moon snail envelops the prey and then bores a hole through the shell using its radula and an acid secretion. Once the shell is bored open, the proboscis is used to consume the flesh of the prey. The hole in the shell, which has a " countersunk " appearance with chamfered edges, and which varies in size according to the species, is a ...
This list of marine gastropod genera in the fossil record is an attempt to list all the genera of sea snails or marine gastropod mollusks which have been found in the fossil record. Nearly all of these are genera of shelled forms, since it is relatively rare for gastropods without a shell ( sea slugs ) to leave any recognizable traces.
The fossil gathered by Tozer is 14 mm (0.55 in) in width and 7 mm (0.28 in) in height. The shell is a depressed heliciform in shape with 5 whorls that gradually increase in size from the umbilicus and a thin outer lip. The shell is rounded and coarsely striate, with the umbilicus taking up 1/3 of the shell. [1]
The two types of fossils can be distinguished by many features, most obvious among which is the suture line: simple in Orthoceras (see image), intricately foliated in Baculites and related forms. See also
The fossil examined in the study, collected during a 2011 expedition by the Antarctic Peninsula Paleontology Project, was found encased in rock that dated back 68.4 to 69.2 million years and ...
The oldest fossils of the genus are known from the Late Eocene Hoko River Formation, in Washington State and from Late-Eocene to Early Oligocene sediments in Kazakhstan. [1] The oldest fossils of the modern species Nautilus pompilius are from Early Pleistocene sediments off the coast of Luzon in the Philippines. [1]