What is the literal meaning for echinoderm?
The phylum Echinodermata , which contains about 6000 species, gets its name from the Greek, literally meaning “spiny skin.” Many echinoderms actually do have “spiny” skin, but others do not.
How do you pronounce phylum Echinodermata?
phylum echinodermata Pronunciation. phy·lum echin·o·der·ma·ta.
What does echinoderm mean in Latin?
1834, from Modern Latin Echinodermata, name of the phylum that includes starfish and sea urchins, from Latinized form of Greek ekhinos “sea urchin,” originally “porcupine, hedgehog” (see echidna) + derma (genitive dermatos) “skin,” from PIE root *der- “to split, flay, peel,” with derivatives referring to skin and …
What does echinoderms mean in Greek?
Echinodermata are so named owing to their spiny skin (from the Greek “echinos” meaning “spiny” and “dermos” meaning “skin”), and this phylum is a collection of about 7,000 described living species. Sea stars (Figure 1), sea cucumbers, sea urchins, sand dollars, and brittle stars are all examples of echinoderms.
How do echinoderms differ from cnidarians?
Echinoderms and cnidarians are quite different in many ways. Echinoderms include animals such as sea stars and sea urchins. Most live on the ocean floor, and they have radial symmetry. Cnidarians include animals such as jellyfish, and they all have stinging cells in their tentacles called nematocysts.
What is the spelling of echinoderms?
any marine animal of the invertebrate phylum Echinodermata, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea urchins, sea cucumbers, etc.
What are the 2 classes of echinoderms?
The echinoderms can be divided into two major groups:
- Eleutherozoa are the echinoderms that can move. This group includes the starfish and most other echinoderms.
- Pelmatozoa are the immobile echinoderms. This group includes crinoids, such as the feather stars.
Is a sand dollar an echinoderm?
Share. Sand dollars are a type of invertebrate related to the sea urchins, sea stars, and sea cucumbers – together known as the echinoderms.
Is silverfish a true fish?
Silverfish belong to invertebrate phylum Arthropoda, so it is an insect. It is a true fish that falls under phylum chordata.
What does the name echinoderms mean?
Echinoderms are radially symmetrical animals that are only found in the sea (there are none on land or in fresh water). Echinoderms mean “spiny skin” in Greek.
What is meaning of echinoderms?
(ĭ-kī′nə-dûrm′) Any of various invertebrate sea animals having a hard spiny outer covering, an internal skeleton, and a radially symmetrical body. Starfish , sea urchins, and sea cucumbers are echinoderms.
What are facts about echinoderms?
Ten Hefty Facts About Echinoderms Echinoderms are invertebrates. Members of phylum Echinodermata which came from the Greek word “spiny skin”. Echinoderms possess specialized structure to protect themselves. Like humans, echinoderms’ epidermis also acts as its first line of defense against potential threat. Echinoderms are capable of regeneration. Echinoderms use water as their blood.
What are the four most common kinds of echinoderms?
Holothuroidea. More commonly known as Sea Cucumbers,these echinoderms have no arms on their bodies.