Giant Tun - shellmuseum
The giant tun, Tonna galea (Linnaeus, 1758) is a large gastropod, with a globose shell, short spire, and ornamented with around 20 spiral, strong but flat ridges. A thin shell wall allows ridges to show on its internal surface. The giant tun has a broad distribution in tropical and subtropical areas of the world’s ocean.
Drupa morum - Wikipedia
Drupa morum, common name the purple drupe, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails. [1] Thick, globose shell, up to 5 cm, with low spire, large body whorl and flat base. Colour white with dark brown nodules.
globose dome - Illinois Department of Natural Resources
This tiny snail has a translucent, white-tinged shell and lives in moist leaf litter, sometimes in great numbers. It is fairly common in Illinois deciduous woodlands. Snails need to seek sheltered places to live, eat and rest.
Gastropod Shell - an overview | ScienceDirect Topics
Moderately inflated whorls produce a sub-globose shell, and shells that are almost circular are globose. There is a continuum between these three shell shapes. Shell thickness varies from thin and fragile, as in many pulmonates, to thick and resistant-to-crushing, as in the caenogastropods.
Pila globosa - Apple Snail
Shell: The shell is globose with an oval opening. In contrast with Pila ampullacea, Pila globosa has a large and deep umbilicus. The colour varies from olive green to grey green with a tinge of red. A large number of variations are known. The interior of the shell is dull reddish with very faint spiral bands visible, white at the columella.
Coordinated response of endemic gastropods to Late Glacial and …
2024年4月24日 · Periods of lower lake levels and reduced warm water input are characterized by the emergence of elongated tightly coiled shells while globular, compressed loosely coiled shells develop at times...
The shell is formed by deposits of calcium laid down by the mantle. As the shell grows in its coiled shape, whorls are added. A snail cannot leave its shell. It has a strong muscle inside that is firmly attached to the shell. Snail shells grow in a variety of shapes. Shell shape, number and type of whorls and shell ornamentation, such as
Coordinated response of endemic gastropods to Late Glacial and …
2024年4月24日 · Globose shells of Microcolpia (PC1 > 0) are restricted to GI-1 and the upper part of the last ca. 5 kys (Fig. 5). During GI-1 there is a moderate increase in shell size, aperture circumference, shell thickness and density as well as the whorl expansion rate (Fig. 6 ).
Gibbula cicer - Wikipedia
Gibbula cicer is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. [1] The size of an adult shell varies between 5 mm and 8 mm. The solid, globose-conical shell is perforate or subperforate. It is longitudinally crossed by reddish or dark brown stripes, often broken into tessellations on the base.
in shell form in the Globorotalia in/lata lineage and in G. crassaformis from an upper Miocene-Pliocene sequence in central New Zealand is studied. In the G. inflata lineage compressed, angular shells in early populations of G. puncticulata sphericomiozea are succeeded by progressively more globose forms