MARE 250 Transect Lab Sea Urchin Key. Echinometra mathaei - rock boring urchin Description: small, light-colored urchin with short spines, thick at the.

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Presentation transcript:

MARE 250 Transect Lab Sea Urchin Key

Echinometra mathaei - rock boring urchin Description: small, light-colored urchin with short spines, thick at the base and tapering to a sharp point; typically greenish-gray or reddish-brown. Size: usually 4-6 cm but up to 15 cm diameter. Habitat: in holes and depressions on rock in shallow areas. VERY COMMON!

Echinothrix diadema – (black; blue-black sea urchin) Description: large urchins with long, slender, needle-like black spines; primary spines are shorter than the test diameter and banded light and dark green in young specimens; two distinct sizes of spines. Size: up to 15 cm diameter. Habitat: in holes on the reef. *** WARNING: this species has venomous spines***

Echinothrix calamaris – (banded sea urchin) Description: large urchins with long, slender, needle- like banded light and dark green spines; large spines covered with small spinelets. Size: up to 15 cm diameter. Habitat: in holes on the reef. *** WARNING: this species has venomous spines ***

Echinometra oblonga - black boring urchin Description: small, dark-colored urchin with short spines, thick at the base and tapering to a sharp point; typically dark purple or black Size: usually 4-6 cm but up to 15 cm diameter. Habitat: in holes and depressions on rock in shallow areas.

Diadema paucispinosum (long spined urchin) - black urchin, thin spines 3 or 4 times wider than the body

Tripneustes gratilla - collector urchin Description: black, round urchin with short, narrow spines often tipped with white or pink; pebbles or shell are often held to the test. Size: up to 10 cm diameter. Habitat: common on reef flats but occurs in a variety of habitats.

Colobocentrotus atratus - shingle urchin Description: small, flattened urchin with paddle-like spines; dark coloration. Size: usually 4-6 cm but up to 9 cm diameter. Habitat: clinging to wave-swept shores.

Heterocentrotus mammillatus - slate pencil urchin Description: large, blunt, pencil-thick spined urchin; often bright red. Size: up to 20 cm diameter. Habitat: in holes on the reef.

Eucidaris metularia - rough spined urchin Description: large, blunt, pencil-thick spined urchin; spines covered with rough, thorn-like projections and often covered with encrustation's. Size: up to 25 cm diameter. Habitat: in holes on the reef.