Table of Contents
What classification is a sea urchin?
Echinoidea
Sea urchins/Scientific names
Sea urchin, any of about 950 living species of spiny marine invertebrate animals (class Echinoidea, phylum Echinodermata) with a globular body and a radial arrangement of organs, shown by five bands of pores running from mouth to anus over the test (internal skeleton).
What is the genus and species of a sand dollar?
Echinarachnius
Data Quality Indicators:
| Order | Clypeasteroida A. Agassiz, 1872 – sand dollars, sand dollars |
| Suborder | Scutellina Haeckel, 1896 |
| Family | Echinarachniidae Lambert, 1914 |
| Genus | Echinarachnius Gray, 1825 |
| Species | Echinarachnius parma (Lamarck, 1816) |
Is a sand dollar a vertebrate or invertebrate?
Sand dollars are a type of invertebrate related to the sea urchins, sea stars, and sea cucumbers – together known as the echinoderms. Echinoderms are the closest living invertebrate relatives of the vertebrates, so our closest invertebrate cousin might just be a sand dollar.
Why do sand dollars have a flower pattern?
The flower-like pattern seen on the test of sand dollars is used for gas exchange. Sand dollars feed by burying themselves “standing up” in the sand. They are able to do this because they are slightly heavier on one side. If you look at their test, you will notice the flower pattern is positioned off-center.
What are the different types of sand dollars?
Sand dollars are classified as follows: 1 Kingdom: Animalia 2 Phylum: Echinodermata 3 Class: Clypeasteroida (includes sand dollars and sea biscuits) More
What phylum is a sand dollar in?
Sand dollar, any of the invertebrate marine animals of the order Clypeastroida (class Echinoidea , phylum Echinodermata) that has a flat, disk-shaped body. They are close relatives of sea urchins and heart urchins. The sand dollar is particularly well adapted for burrowing in sandy substrates.
What does a live sand dollar look like?
This design mirrors the internal structure of the sand dollar, and is called petaloid ambulacra. However, a live sand dollar has a different look: densely packed, tiny spines that are gray-to-purple in color cover live sand dollars and hide the star design.
What kind of symmetry does a sand dollar have?
The bodies of adult sand dollars, like those of other echinoids, display radial symmetry. The petal-like pattern in sand dollars consists of five paired rows of pores.