Pea urchin

Echinocyamus pusillus

ORDER Laganina

FAMILY Fibulariidae

TAXONOMY

Echinocyamus pusillus Muller, 1776.

OTHER COMMON NAMES

English: Dwarf sea urchin.

PHYSICAL CHARACTERISTICS

Among one of the smallest urchins, its tiny oval test measures up to a maximum 0.6 in (1.5 cm) in length. Usually gray-green to bright green in color with very short spines, which give the animal a velvet texture to touch.

DISTRIBUTION

European coastal waters to a depth of 165 ft (50 m). HABITAT

Lives buried in coarse gravel, sandy sediment, and among Zos-teria and maerl beds.

BEHAVIOR

Little known.

H Echinocyamus pusillus H Echinostrephus aciculatus H Dendraster excentricus

FEEDING ECOLOGY AND DIET

Primarily deposit feeder, but also preys on foraminiferans and grazes on individual sediment grains for its organic coating.

CONSERVATION STATUS Not listed by the IUCN.

SIGNIFICANCE TO HUMANS

Selected by beachcombers for their aesthetic value. ♦

REPRODUCTIVE BIOLOGY

Sexual reproduction. Sexes are separate. Eggs and sperm are shed into the water column, where they are fertilized and develop into free-living larvae.

CONSERVATION STATUS

Not listed by the IUCN.

SIGNIFICANCE TO HUMANS None known. ♦

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

Get My Free Ebook


Post a comment