However the phrase " sea slug " is also applied to various other groups within the Opisthobranchia including the sea hares, the sacoglossans, various families of bubble snails ( Cephalaspidea ) and others, some of which have reduced shells, and many of which are shell-less.

The Opisthobranchia includes a number of species in the order Cephalaspidea ( bubble shells and headshield slugs ), the sacoglossans, the anaspidean sea hares, the pelagic sea angels, the sea butterflies, and many families of Nudibranchia.

Sacoglossa, commonly known as the sacoglossans or the " sap-sucking sea slugs ", are a clade of small sea slugs and sea snails, marine gastropod mollusks that belong to the clade Heterobranchia.

The majority of sacoglossans are shell-less, consequently the placobranchoidea are commonly described using the vernacular term " sea slugs ", which can lead to their confusion with the only very distantly related nudibranchs.

This very unusual ability has led to these sacoglossans being referred to as " solar-powered sea slugs ".

Some sacoglossans simply digest the sap which they suck from the algae, but in some other species the slugs sequester and utilize within their own tissues, living chloroplasts from the algae they eat, a very unusual phenomenon known as kleptoplasty.

The sacoglossans can utilise the chloroplasts of the algae on which they feed, which they keep alive for hours to months after their ingestion.

They maintain the cells and metabolise the photosynthetic products ; this process is termed kleptoplasty, and the sacoglossans are the only animals to employ it ; some ciliates and foramanifera ( protists ) also employ the strategy.

The switch from active feeding to photosynthesis in sacoglossans is triggered by the shortage of food resource, and typically not preferred.

Starvation periods ( periods of photosynthesis and no active feeding ) vary between species of sacoglossans from less than a week to over four months and is used as a last resort mechanism to avoid mortality.

Predators of marine bryozoans include nudibranchs ( sea slugs ), fish, sea urchins, pycnogonids, crustaceans, mites and starfish.

Many are preyed upon by other animals including starfish, sea slugs, fish and turtles.

Nociception has been documented in non-mammalian animals, including fishes and a wide range of invertebrates, including leeches, nematode worms, sea slugs, and fruit flies.

Sea lemon is a loosely-applied common name for a group of medium-sized to large shell-less colorful sea slugs or nudibranchs, specifically dorid nudibranchs in the taxonomic family Dorididae and other closely related families.

Certain types of sea slugs, such as the nudibranch aeolids, are known to undergo kleptocnidae ( in addition to kleptoplasty ), whereby the organisms store nematocysts of digested prey at the tips of their cerata.

Today, the word " bislama " itself is seldom used by younger speakers of Bislama to refer to sea slugs, as a new re-borrowing from pseudo-French " bêche de mer ", which has taken the form " besdemea ", has become more popular.

Dirona is a genus of sea slugs, Pacific Ocean nudibranchs, marine, opisthobranch gastropod mollusks in the family Dironidae.

Some dinoflagellates and sea slugs, in particular of the genus Elysia, take up algae as food and keep the plastid of the digested alga to profit from the photosynthesis ; after a while, the plastids are also digested.

In addition soft sediments tend to accumulate on seamounts, which are typically populated by polychaetes ( annelid marine worms ) oligochaetes ( microdrile worms ), and gastropod mollusks ( sea slugs ).

Fruit flies, nematode worms, mice and rats together account for the vast majority, though small numbers of other species are used, ranging from sea slugs through to armadillos.

There are huge numbers of sea snails and sea slugs, as well as freshwater snails and freshwater limpets, and land snails and land slugs.

Some sea slugs are very brightly colored.

In one large group of sea slugs, the gills are arranged as a rosette of feathery plumes on their backs, which gives rise to their other name, nudibranchs.

A few sea slugs are herbivores and some are carnivores.

** certain nudibranchs, sea slugs

Nudibranchs (" sea slugs ") of the genus Trapania and turbellarian flatworms prey on entoprocts.

In English translations of these haiku, they are usually called " sea slugs ".

Nudibranchs are often casually called " sea slugs ", but many sea slugs belong to several taxonomic groups which are not closely related to nudibranchs.

Just as the Greeks saw the mountains, forests, sea and rivers as inhabited by concrete beings, so nature in all of its manifestations possesses clear form, and the form of a work of art.

The focal point of the park is the main terrace, surrounded by a long bench in the form of a sea serpent.

Pytheas says that the Gutones, a people of Germany, inhabit the shores of an estuary of the Ocean called Mentonomon, their territory extending a distance of six thousand stadia ; that, at one day's sail from this territory, is the Isle of Abalus, upon the shores of which, amber is thrown up by the waves in spring, it being an excretion of the sea in a concrete form ; as, also, that the inhabitants use this amber by way of fuel, and sell it to their neighbors, the Teutones.

Alexandrines also formed the first line of the couplet form Poulter's Measure ( the second line being a fourteener ) as exemplified in Henry Howard, Earl of Surrey's poem, Complaint of the Absence of her lover, being upon the sea ( 1547 ).

Ægir is an Old Norse word meaning " terror " and the name of a destructive giant associated with the sea ; ægis is the genitive ( possessive ) form of ægir and has no direct relation to Greek aigis.

These channels are the main transport pathway for sediments to the deep sea where they form sedimentary deposits.

The latter half of the period experienced glaciations, low sea level, and mountain building as the continents collided to form Pangaea.

Appear mostly occupying favorable areas named geographically Umbrias, this is north hillsides or slopes of the mountainous areas that are oriented behind the sun, be cause the islands are in the northern hemisphere, between 600 and 1500 meters, thus benefiting from the humidity provided by the trade winds to form such a sea of clouds.

North Keeling Island and the surrounding sea to from shore form the Pulu Keeling National Park, established on 12 December 1995.

Due to the high sea level there was extensive accommodation space for sedimentation so that thick deposits could form.

Water-based ice in the form of snow, sea ice and glaciers is a very common manifestation of crystalline or polycrystalline matter on Earth.

Stephen Dedalus, in Joyce's Portrait of the Artist as a Young Man envisages his future artist-self " a winged form flying above the waves [...] a hawk-like man flying sunward above the sea, a prophecy of the end he had been born to serve ”.

In his paper, he explained his theory that the Earth must be much older than had previously been supposed in order to allow enough time for mountains to be eroded and for sediments to form new rocks at the bottom of the sea, which in turn were raised up to become dry land.

In 1842 the Swedish chemist Baron Jöns Jakob Berzelius proposed the term " halogen " – ἅλς ( háls ), " salt " or " sea ", and γεν-( gen -), from γίγνομαι ( gígnomai ), " come to be " – for the four elements ( fluorine, chlorine, bromine, and iodine ) that produce a sea-salt-like substance when they form a compound with a metal.

It would be logically correct to do so, and rowing boats as such do form a practical group, but speaking of " non-rowing boats " would lump together land, sea, air and space transport in ways that rarely would be useful.

But the skalds weren ’ t averse either to arbitrary, purely decorative, use of kennings: “ That is, a ruler will be a distributor of gold even when he is fighting a battle and gold will be called the fire of the sea even when it is in the form of a man ’ s arm-ring on his arm.

The son of one of the Dragon Kings ( a ruler-god of the sea ) was caught by a fisherman while taking the form of a fish.

Calcite, CaCO < sub > 3 </ sub >, can have a high magnesium impurity ; under high-Mg conditions, its polymorph aragonite will form instead ; the marine geochemistry in this regard can be described as a aragonite or calcite sea, depending on which mineral preferentially forms.

He writes, for example, that Moses opposed the picturing of the deity in the form of man or animal, and was convinced that the deity was an entity which encompassed everything — land and sea:

Iron in the form of non-heme iron in beans, sea vegetables and leafy greens is sufficient for good health ; detailed information is in the USDA database.

The prevailing south west winds then pick up and redeposit the sand in the form of massive dunes in the widespread sand sea, the largest sand dunes in the world.

Although there is usually no parental care after birth, before birth parents may scatter, hide, guard or brood eggs, with sea horses being notable in that the males undergo a form of " pregnancy ", brooding eggs deposited in a ventral pouch by a female.

Pytheas says that the Gutones, a people of Germany, inhabit the shores of an estuary of the Ocean called Mentonomon, their territory extending a distance of six thousand stadia ; that, at one day's sail from this territory, is the Isle of Abalus, upon the shores of which, amber is thrown up by the waves in spring, it being an excretion of the sea in a concrete form ; as, also, that the inhabitants use this amber by way of fuel, and sell it to their neighbours, the Teutones.

This theory, conceived by a British Glass manufacturer, proposes that the first two figures are Gauis Octavius, father of the future emperor, and Attia Julia Balboa, his mother ( hence the cherub with the arrow ) who had a dream of being impregnated by Apollo in the form of a sea serpent ( ketos ), note the snake's prominent teeth.