Many also have a simple gut and a mouth with a radula. For example, the Spanish dancer nudibranch genus Hexabranchusamong the largest of tropical marine slugs, potently chemically defended, and brilliantly red and white, is nocturnal and has no known mimics.
Other nudibranchs, as seen especially well on chromodoridshave an intensely bright and contrasting color pattern that makes them especially conspicuous in their surroundings.
Nuclear genes horizontally transferred from algae into the slugs likely play an important role in the slugs' ability to photosynthesize . In most cases the slugs re-use the colour pigments of their food by incorporating them in their skin.
Vestigial shell Most slugs retain a remnant of their shell, which is usually internalized. Specific behavioral displays in response to starvation can be highly variable, as environmental conditions e.
Transferring memories from one mind to another seems like something out of science fiction. Another way of matching their colour with their food is found in the many spcies which have colourless, essentially transparent, skins.
It is the case in the Philomycidae e. This suggests that photosynthesis in E. The predation of slugs has been the subject of studies for at least a century. Some species have direct development and the shell is shed before the animal emerges from the egg mass. Reproduction[ edit ] Deroceras juvenile with eggs of another larger slug species, most likely Arionidae Slugs are hermaphroditeshaving both female and male reproductive organs.
Note the oral tentacles otfoot tentacles fteye erhinophores rand cerata c. In a small apartment they are audible at the distance of twelve feet. Mating more often decreased egg count by 10 percent.
The external anatomy of a slug The external anatomy of a slug includes the following: In these experiments, McConnell took RNA from trained flatworms which, like sea slugs, are extremely simple creatures and injected it into untrained flatworms.
Studies have shown that learning induces epigenetic changes in the brainand that blocking these epigenetic changes can block memory formation. Like almost all gastropods, a slug moves by rhythmic waves of muscular contraction on the underside of its foot.
Despite this widespread reliance on other plant and animal pigments, the majority of opisthobranchs manufacture their own pigments. Although increased foraging efforts under starvation conditions and a decrease during satiation is usual for many species, the foraging behavior of photosynthetic sea slugs may be different, if food is withheld, provided that photosynthesis continues.
Traditionally, nudibranchs have been treated as the order Nudibranchia, located in the gastropod mollusc subclass Opisthobranchia (the marine slugs: which consisted of nudibranchs, sidegill slugs, bubble snails, algae sap-sucking sea slugs, and sea hares).
Behavior of Sea Slugs Ashley Lewis B Scientific Method Lab Essay In an observation dealing with Brattles leach’, a sea slug, scientists recorded data over a day period.
They had noticed that the same pattern was occurring with the movement of the slugs. National Geographic Nudibranch Photo Gallery; Sea slugs of Hawaii; Slug City – Molluscs.
Brain & Behavior, from the University of Illinois at Urbana-Champaign; Videos. Attack of the Sea Slugs; The Lynx Nudibranch: HD clip of Phidiana lynceus carefully consuming a hydroid Myrionema amboinense.
Slug City – Molluscs. Welcome to the Sea Slug Forum On the Sea Slug Forum you can ask questions, post information and find out more about nudibranchs, bubble-shells, sea hares and other sea slugs.
Tracings of the slug and sea star made from cropped behavior camera frames spanning a s interval. (A) The sea star approaches the slug. (B) Contact with the sea star causes the slug to begin its escape swim with a ventral flexion.Behavior of sea slugs