Sea urchin deutsch

sea urchin deutsch

Übersetzung im Kontext von „, sea urchin,“ in Englisch-Deutsch von Reverso Context: sea urchin. Viele übersetzte Beispielsätze mit "sea urchin" – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen. Übersetzung im Kontext von „sea-urchin“ in Englisch-Deutsch von Reverso Context: sea urchin.

Sea Urchin Deutsch Video

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They live in the deep parts of the ocean but are also found in the shallow parts. They prefer to live in coral reefs and areas that are more prone to tidal waves.

Their body structure is globular with long spikes protruding out of it. This structure is generally hard. The spikes protect them from predators.

The average size of a sea urchin is inches. They have 5 teeth and a flabby structure resembling a tongue at the oral opening which is taken to be a mouth.

According to Aristotle's description of the oral opening, it is termed as 'Aristotle's lantern'. No locomotive organs like legs are seen on a sea urchin, but experts believe that it uses its spikes and small tube feet to move around easily in the water.

Even a slight movement near it will elicit a strong reaction from it. The spikes give an instant reaction and it moves away immediately. Slate pencil urchin Caribbean sea urchin Sea potato Purple sea urchin Red sea urchin longest living.

Sea urchins are omnivores, i. So, they are perfect scavengers and feed on whatever they find in the ocean. The general diet of a sea urchin includes algae.

In fact, they are mainly responsible for the regulation of algae in the oceans. The animals have been studied since the 19th century as model organisms in developmental biology , as their embryos were easy to observe; this has continued with studies of their genomes because of their unusual fivefold symmetry and relationship to chordates.

Species such as the slate pencil urchin are popular in aquariums, where they are useful for controlling algae.

Fossil urchins have been used as protective amulets. Sea urchins are members of the phylum Echinodermata , which also includes sea stars, sea cucumbers, brittle stars , and crinoids.

Like other echinoderms, they have five-fold symmetry called pentamerism and move by means of hundreds of tiny, transparent, adhesive " tube feet ".

The symmetry is not obvious in the living animal, but is easily visible in the dried test. Specifically, the term "sea urchin" refers to the "regular echinoids", which are symmetrical and globular, and includes several different taxonomic groups, with two subclasses: Euechinoidea "modern" sea urchins, including irregular ones and Cidaroidea or "slate-pencil urchins", which have very thick, blunt spines, with algae and sponges growing on them.

The "irregular" sea urchins are an infra-class inside the Euechinoidea, called Irregularia , and include Atelostomata and Neognathostomata.

Together with sea cucumbers Holothuroidea , they make up the subphylum Echinozoa , which is characterized by a globoid shape without arms or projecting rays.

Sea cucumbers and the irregular echinoids have secondarily evolved diverse shapes. Although many sea cucumbers have branched tentacles surrounding their oral openings, these have originated from modified tube feet and are not homologous to the arms of the crinoids, sea stars, and brittle stars.

Paracentrotus lividus , a regular sea urchin Euechinoidea , infraclass Carinacea. A sand dollar , an irregular sea urchin Irregularia.

Phyllacanthus imperialis , a cidaroid sea urchin Cidaroidea. Like other echinoderms, sea urchin early larvae have bilateral symmetry, [9] but they develop five-fold symmetry as they mature.

This is most apparent in the "regular" sea urchins, which have roughly spherical bodies with five equally sized parts radiating out from their central axes.

The mouth is at the base of the animal and the anus at the top; the lower surface is described as "oral" and the upper surface as "aboral".

Several sea urchins, however, including the sand dollars, are oval in shape, with distinct front and rear ends, giving them a degree of bilateral symmetry.

In these urchins, the upper surface of the body is slightly domed, but the underside is flat, while the sides are devoid of tube feet.

This "irregular" body form has evolved to allow the animals to burrow through sand or other soft materials. Sea urchins may appear to be incapable of moving but this is a false impression.

Sometimes, the most visible sign of life is the spines, which are attached to ball-and-socket joints and can point in any direction; in most urchins, touch elicits a prompt reaction from the spines, which converge toward the touched point.

Sea urchins have no visible eyes, legs, or means of propulsion, but can move freely but slowly over hard surfaces using adhesive tube feet, working in conjunction with the spines.

The internal organs are enclosed in a hard shell or test composed of fused plates of calcium carbonate covered by a thin dermis and epidermis.

The test is rigid, and divides into five ambulacral grooves separated by five interambulacral areas. Each of these areas consists of two rows of plates, so the sea urchin test includes 20 rows of plates in total.

The plates are covered in rounded tubercles which contain the sockets to which the spines are attached by ball and socket joints.

The inner surface of the test is lined by peritoneum. Most species have two series of spines, primary long and secondary short , distributed over the surface of the body, with the shortest at the poles and the longest at the equator.

The spines are usually hollow and cylindrical. Contraction of the muscular sheath that covers the test causes the spines to lean in one direction or another, while an inner sheath of collagen fibres can reversibly change from soft to rigid which can lock the spine in one position.

Located among the spines are several types of pedicellaria , moveable stalked structures with jaws.

Sea urchins move by walking using their many flexible tube feet in a similar way to starfish; regular sea urchins do not have any favourite walking direction.

During locomotion, the tube feet are assisted by the spines which can be used for pushing the body along or to lift the test off the substrate.

Movement is generally related to feeding, with the red sea urchin Mesocentrotus franciscanus managing about 7. An inverted sea urchin can right itself by progressively attaching and detaching its tube feet and manipulating its spines to roll its body upright.

Test of an Echinus esculentus , a regular sea urchin. Test of an Echinodiscus tenuissimus , an irregular sea urchin " sand dollar ". Test of a Phyllacanthus imperialis , a cidaroid sea urchin.

These are characterised by their big tubercles, bearing large radiola. Close-up of the test showing an ambulacral groove with its two rows of pore-pairs, between two interambulacra areas green.

The tubercles are non-perforated. Close-up on a cidaroid sea urchin apical disc: The biggest genital plate is the madreporite. The mouth lies in the centre of the oral surface in regular urchins, or towards one end in irregular urchins.

It is surrounded by lips of softer tissue, with numerous small, embedded bony pieces. This area, called the peristome, also includes five pairs of modified tube feet and, in many species, five pairs of gills.

Specialised muscles control the protrusion of the apparatus and the action of the teeth, and the animal can grasp, scrape, pull and tear.

On the upper surface of the test at the aboral pole is a membrane, the periproct , which surrounds the anus. The periproct contains a variable number of hard plates, five of which, the genital plates, contain the gonopores, and one is modified to contain the madreporite , which is used to balance the water vascular system.

The mouth of most sea urchins is made up of five calcium carbonate teeth or jaws, with a fleshy, tongue-like structure within. The entire chewing organ is known as Aristotle's lantern from Aristotle 's description in his History of Animals.

However, this has recently been proven to be a mistranslation. Aristotle's lantern is actually referring to the whole shape of sea urchins, which look like the ancient lamps of Aristotle's time.

Heart urchins are unusual in not having a lantern. Instead, the mouth is surrounded by cilia that pull strings of mucus containing food particles towards a series of grooves around the mouth.

The lantern, where present, surrounds both the mouth cavity and the pharynx. At the top of the lantern, the pharynx opens into the esophagus, which runs back down the outside of the lantern, to join the small intestine and a single caecum.

The small intestine runs in a full circle around the inside of the test, before joining the large intestine, which completes another circuit in the opposite direction.

From the large intestine, a rectum ascends towards the anus. Despite the names, the small and large intestines of sea urchins are in no way homologous to the similarly named structures in vertebrates.

Digestion occurs in the intestine, with the caecum producing further digestive enzymes. An additional tube, called the siphon, runs beside much of the intestine, opening into it at both ends.

It may be involved in resorption of water from food. The water vascular system leads downwards from the madreporite through the slender stone canal to the ring canal, which encircles the oesophagus.

Radial canals lead from here through each ambulacral area to terminate in a small tentacle which passes through the ambulacral plate near the aboral pole.

Lateral canals lead from these radial canals, ending in ampullae. From here, two tubes pass through a pair of pores on the plate to terminate in the tube feet.

Sea urchins possess a hemal system with a complex network of vessels in the mesenteries around the gut, but little is known of the functioning of this system.

This coelomic fluid contains phagocytic coelomocytes, which move through the vascular and hemal systems and are involved in internal transport and gas exchange.

The coelomocytes are an essential part of blood clotting , but also collect waste products and actively remove them from the body through the gills and tube feet.

Most sea urchins possess five pairs of external gills attached to the peristomial membrane around their mouths. These thin-walled projections of the body cavity are the main organs of respiration in those urchins that possess them.

Fluid can be pumped through the gills' interiors by muscles associated with the lantern, but this does not provide a continuous flow, and occurs only when the animal is low in oxygen.

Tube feet can also act as respiratory organs, and are the primary sites of gas exchange in heart urchins and sand dollars, both of which lack gills.

The inside of each tube foot is divided by a septum which reduces diffusion between the incoming and outgoing streams of fluid. The nervous system of sea urchins has a relatively simple layout.

With no true brain, the neural center is a large nerve ring encircling the mouth just inside the lantern. From the nerve ring, five nerves radiate underneath the radial canals of the water vascular system, and branch into numerous finer nerves to innervate the tube feet, spines, and pedicellariae.

Sea urchins are sensitive to touch, light, and chemicals. There are numerous sensitive cells in the epithelium, especially in the spines, pedicellaria and tube feet, and around the mouth.

Most species, apart from pencil urchins , have statocysts in globular organs called spheridia. These are stalked structures and are located within the ambulacral areas; their function is to help in gravitational orientation.

Sea urchins are dioecious , having separate male and female sexes, although no distinguishing features are visible externally.

This opened up new habitats, in particular, the burrowing habitat. Sand dollars and heart urchins have been highly successful.

Some humans eat the reproductive organs of sea urchins which they call roe. This is popular in Korea.

In Japan , this kind of sushi is called uni. From Wikipedia, the free encyclopedia. Sea urchin Scientific classification Kingdom: Annual Review of Earth and Planetary Sciences Fisheries and Oceans Canada.

Archived from the original on January 23, Retrieved November 29, Invertebrate palaeontology and evolution. Chapter 9 covers Echinoderms.

Sea urchins feed mainly on algae , but can also feed on sea cucumbers, and a wide range of invertebrates such as mussels , polychaetes , sponges , brittle stars and crinoids.

Left unchecked, urchins may devastate their environment, creating an urchin barren , devoid of macroalgae and associated fauna.

Sea otters have re-entered British Columbia , dramatically improving coastal ecosystem health by eating sea urchins. The first echinoid fossils are from the Lower Ordovician period.

The earliest forms had flexible tests, with plates that could slide over each other. Echinoids were a relatively unimportant part of the biota in the Palaeozoic.

The break with perfect symmetry, which happened in the Jurassic , gave them definite front and back ends. This opened up new habitats, in particular, the burrowing habitat.

Sand dollars and heart urchins have been highly successful. Some humans eat the reproductive organs of sea urchins which they call roe.

This is popular in Korea. In Japan , this kind of sushi is called uni. From Wikipedia, the free encyclopedia. Sea urchin Scientific classification Kingdom: Annual Review of Earth and Planetary Sciences Fisheries and Oceans Canada.

Archived from the original on January 23, Retrieved November 29, Invertebrate palaeontology and evolution. Chapter 9 covers Echinoderms. There's a lot that we don't know about sea urchins, which can make them quite misunderstood.

For instance, did you know that though considered extremely poisonous by many, it is only the Asteroidea, Echinoidea, and Holothuroidea classes that can cause some serious damage with the venom that they squirt?

A sea urchin is a marine animal which belongs to the Echinodermata phylum, Echinoidea class and order Echinoida.

Other family members include the sea cucumber, sea star and sand dollar. They are found all over the world. There are more than varieties of sea urchins.

They live in the deep parts of the ocean but are also found in the shallow parts. They prefer to live in coral reefs and areas that are more prone to tidal waves.

Their body structure is globular with long spikes protruding out of it. This structure is generally hard. The spikes protect them from predators.

The average size of a sea urchin is inches. They have 5 teeth and a flabby structure resembling a tongue at the oral opening which is taken to be a mouth.

According to Aristotle's description of the oral opening, it is termed as 'Aristotle's lantern'. No locomotive organs like legs are seen on a sea urchin, but experts believe that it uses its spikes and small tube feet to move around easily in the water.

Even a slight movement near it will elicit a strong reaction from it. The spikes give an instant reaction and it moves away immediately.

Slate pencil urchin Caribbean sea urchin Sea potato Purple sea urchin Red sea urchin longest living. Sea urchins are omnivores, i.

So, they are perfect scavengers and feed on whatever they find in the ocean. The general diet of a sea urchin includes algae.

In fact, they are mainly responsible for the regulation of algae in the oceans. Apart from algae, they also like to feed on seaweed, kelp, sand and mud.

They also eat dead fish or different types of sponges and mussels found in the ocean.

Sea urchin deutsch -

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