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The echinoderms or echinodermata They are invertebrate marine animals but they do have a dermoskeleton. This type of marine animal has calcareous plates or spiny granules scattered throughout the body. Hence its name: echinoderm, which means "skin that is covered with thorns”.
The calcareous plates are composed of calcium carbonate and some of them are articulated with each other as in the case of the starfish, while others are welded forming a kind of shell as in the case of sea urchins.
The echinoderms they can only live in the marine environment. These move crawling on the bottom of the marine environment and their way of reproduction is asexual, in some cases having the ability to regenerate, as is the case with starfish.
- It can help you: Arthropod animals.
As they are?
Echinoderms present radial symmetry, more specifically they are penta-radially symmetric. That is, their body parts are located around a center.
They have neither head nor brain. However, they can perceive what is happening around them by body cells that collect information from their environment. They also do not have a heart since their circulatory system is open.
Examples of echinoderms
- Starfish
- Comet star or Linckia guildingi
- Orthasterias koehleri
- Snuffbox
- Ofiura
- Sea lily
- Flamenco language
- Comatula
- Flamenco language
- Mediterranean Comatula
Examples of echinoderms according to subspecies
Sea lilies
- Davidaster rubiginosus
- Endoxocrinus parrae
- Himerometra robustipinna
- Lamprometra palmata
- Celtic leptometra
- Ptilometra australis
- Stephanometrist indicates
- Tropiometra carinata
Starfish or Asteroid. They are classified in orders:
- Order Brisingida, where there are 111 species
- Order Forcipulatida, with 269 species
- Order Paxillosida, 372 species
- Order Notomyotida, 75 species
- Order Spinulosida, 121 species
- Valvatida order, with 695 species
- Order Velatida, with 138 species
Some species are:
| Asterias forbesi | Linckia multifora |
| Crown of thorns | Mithrodia fisheri |
| Sugar star | Nardoa galatheae |
| Pink star | Ophidiasteridae |
| Forcipulatide | Oreasteridae |
| Fromia monilis | Orthasterias koehleri |
| Goniasteridae | Pentaceraster |
| Henricia leviuscula | Pentagonaster |
| Bloody Henricia | Spinuloside |
| Leiaster leachi | Valvatida |
Ofiuras
| Amphiodia occidentalis | Ophioderma panamensis |
| Amphipholis | Ophionereis annulata |
| Amphipholis squamata | Ophiopholis aculeata |
| Amphiura arcystata | Ophiopholis kennerlyi |
| Ophiocoma erinaceus | Ophioplocus esmarki |
| Ophiocomina nigra | Ophiothrix spiculata |
| Ophioderma | Ophiotrix fragilis |
| Ophioderma longicauda | Ophiurida |
Sea urchins
| Chondrocidaris gigantea | Heart hedgehogs |
| Colobocentrotus atratus | Pebble urchins or hoof urchins |
| Paucispinum headband | Common sea urchins |
| Diadematoid | Pencil tip hedgehogs |
| Sand dollars or uneven hedgehogs | Lytechinus semituberculatus |
| Echinometridae | Sea potato |
| Echinothrix headband | Pseudoboletia indiana |
| Parson's hat sea urchin | Toxopneustidae |
Sea cucumbers. They are divided into different families and classes:
- Dendrochirotacea
- Aspidochirotacea
- Apodacea
Some species are:
| Actinopyga | Chocolate chip sea cucumber |
| Bohadschia Paradoxa | Black sea cucumber |
| Holothuria cinerascens | Psolidae |
| Holothuria pervicax | Sclerodactylidae |
| Leptosynapta tenuis | Stichopus |
| Parastichopus californicus | Synapta maculata |
| Warty sea cucumber | Thelenota ananas |
