Search results
Results From The WOW.Com Content Network
A slug on a wall in Kanagawa, Japan.. Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc.The word slug is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a small internal shell, particularly sea slugs and semi-slugs (this is in contrast to the common name snail, which applies to ...
In contrast to many other mollusc classes, aplacophorans have no shell, and are instead covered by aragonitic sclerites (calcareous spicules), which can be solid or hollow.. These spicules can be arranged perpendicular to one another within the cuticle to form a skeleton, stick up to form a palisade, or can lie flat against the cutic
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 to leave any recognizable traces. It is also worth ...
The class Gastropoda is a diverse and highly successful class of mollusks within the phylum Mollusca. ... Slugs are gastropods that have no shell or a very small ...
Aplacophora / æ p l ə ˈ k ɒ f ər ə / is a possibly paraphyletic taxon. This is a class of small, deep-water, exclusively benthic, marine molluscs found in all oceans of the world. [1]
The mystery mollusks are hermaphrodites, which include both male and female reproductive organs. When it is time to release eggs, they descend and use their foot to temporarily attach to the seafloor.
The shell ranges from 3 mm to 37 mm in diameter depending on species. Like in chitons , the head is poorly defined, and there are no eyes. The mouth is located within the animal's undeveloped head in front of its single large foot and contains a radula , a defining characteristic of the mollusca.
Helcionellid or Helcionelliformes is an order of small fossil shells that are universally interpreted as molluscs, [3] though no sources spell out why this taxonomic interpretation is preferred. [4] These animals are first found about 3] in the late Nemakit-Daldynian age, which is the earliest part of the Cambrian period.