What does the name echinoderm mean?

What does the name echinoderm mean?

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.

Who named Echinodermata?

The name Echinodermata (Gr., echinos = hedgehog + derma = skin) appears to have originated with Jacob Klein (1734), who, however, applied it only to echinoids. Echinodermata are all exclusively marine animals living on the shore but mostly on the bottom of the sea.

Why is phylum Echinodermata named so?

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.

Is echinoderm a family?

Starfish, brittle stars, sea urchins, and sea cucumbers all belong to the family of echinoderms. These slow-moving, headless invertebrates are the only animals with bodies based on a five-pointed structure. All echinoderms live in salt water.

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 echinoderm mean in Greek quizlet?

STUDY. Phylum Echinodermata. Named for the spines or bumps covering their outer surface, the name means “spiny skin;” Greek root work echino- meaning spiny; Latin root word derm meaning skin.

How do echinoderms reproduce?

Echinoderm Reproduction Some echinoderms can reproduce asexually by fission, but most echinoderms reproduce sexually. They generally have separate sexes and external fertilization. Eggs hatch into free-swimming larvae. The larvae undergo metamorphosis to change into the adult form.

Which is the most recently discovered echinoderm?

The investigation revealed fossils to be a new species, now named Rhenopyrgus viviani, that lived 435 million years ago. The extinct echinoderm is a distant relative of the starfish, a group that until now has been surrounded with controversy regarding their skeletal structures, behaviour and evolution.

What does asteroidea mean in Latin?

Origin of Asteroidea Aster(ias) a starfish genus (

How did the echinoderm get its name from the Greek?

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. This phylum exists exclusively in the sea, and cannot be found on land or in fresh water. All echinoderms have one thing in common: radial symmetry.

Are there any echinoderms that can be found on land?

This phylum exists exclusively in the sea, and cannot be found on land or in fresh water. All echinoderms have one thing in common: radial symmetry.

When does an echinoderm become a male or female?

Echinoderms are either male or female and become sexually mature after about two to three years. Most release their eggs and sperm into the water where they are fertilized. A female can release one hundred million eggs at once.

What kind of symmetry does an echinoderm have?

The body plans of adult echinoderms show radial symmetry, typically in the pattern of a five-pointed star, while the larvae show bilateral symmetry. Echinoderms probably share a common ancestor with the hemichordates and chordates, and were already quite diversified by the Cambrian Era.