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The anal sulcus, also called the anal sinus or anal canal, in Gastropods is a notch, a shelly tube at the top of the aperture. [1] It is the first notch close to the suture. It houses the anal siphon through which the snail expels water and waste products. Shell of Drillia poecila Sysoev & Bouchet, 2001, showing the anal sulcus on top of the ...
The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less but may have a remnant within the mantle, or in some cases the shell is reduced such that the body cannot be retracted within it .
This genus is a heterogeneous assemblage. Because the shell characters of this genus converge with those of the larger specimens of some closely related genera (Saphtia Winter, 2008, [3] Pseudosaphtia Winter, 2008 [3] and Vanmolia Winter, 2008 [3]), the delimitation of * To Thapsia s.l. is difficult. There very few papers that describe the ...
shell of Rhodacmea filosa 31 May 2011 - the Wicker ancylid Rhodacmea filosa, (shell pictured) listed as extinct by the IUCN Red List, has been rediscovered. New gastropod taxa described in 2011; 18 April 2011 - Research on the mating of Chelidonura sandrana contradicts the traditional theory about mating in simultaneous hermaphrodites.
This list of gastropods described in 2018 is a list of new taxa of snails and slugs of every kind that have been described (following the rules of the ICZN) during the year 2018. The list only includes taxa at the rank of genus or species .
Portal:Gastropods/Selected picture/1 . The sculpture of this shell of Epitonium scalare is raised vertical ribs which are known as costae.Costae are a common feature in the shells of many species within the genus Epitonium, generally known as wentletraps (a word derived from the Dutch word for spiral staircase).
Shell of marine snail Lunella torquata with the calcareous operculum in place Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place. An operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also ...
The order Cephalaspidea, also known as the headshield slugs and bubble snails, is a major taxon of sea slugs and bubble snails, marine gastropod mollusks within the larger clade Euopisthobranchia. [1] Bubble shells is another common name for these families of marine gastropods, some of which have thin bubble-like shells. [2]