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Cephalopod appendages surround the mouth, so logically they could be derived from embryonic head tissues. [150] However, the "Arms as Foot" hypothesis, proposed by Adolf Naef in 1928, has increasingly been favoured; [ 149 ] for example, fate mapping of limb buds in the chambered nautilus indicates that limb buds originate from "foot" embryonic ...
The estimate of 85,000 mollusks includes 24,000 described species of terrestrial gastropods. [9] Different estimates for aquatic gastropods (based on different sources) give about 30,000 species of marine gastropods, and about 5,000 species of freshwater and brackish gastropods. Many deep-sea species remain to be discovered, as only 0.0001% of ...
The radula (US: / ˈ r æ dʒ ʊ l ə /; pl.: radulae or radulas) [1] is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. [2] It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus.
Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks [a] (/ ˈ m ɒ l ə s k s /). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda . [ 5 ]
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Adult barnacles have few appendages on their heads, with only a single, vestigial pair of antennae attached to the cement gland. The six pairs of thoracic limbs are called cirri; these are feathery and very long. The cirri extend to filter food, such as plankton, from the water and move it towards the mouth. [9]
Some species have venomous appendages on their sides, which deter predators. Many also have a simple gut and a mouth with a radula. [16] The eyes in nudibranchs are simple and able to discern little more than light and dark. [17]
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