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Beautiful sea flowers in underwater world with corals

Heterocentrotus mamillatus, commonly known as the slate pencil urchin, red slate pencil urchin, or red pencil urchin, is a species of tropical sea urchin from the Indo-Pacific region

Sea life Spiral tubeworm Underwater beauty

Single purple sea urchin in the middle of coral reef tank in an aquarium

The Red Urchin, blue-spotted urchin; Fire Urchin or False Fire Urchin, Astropyga radiata, is an urchin, with a test (shell) diameter of about 20 cm. It is found in the Indo-Pacific region. Maui Island, Hawaii

Rock boring urchin, Echinometra mathaei, nestled in a crevise of a tide pool. The urchin uses it jaws to enlarge the hole as it grows. Ko Olina, Oahu, Hawaii.

Red Pencil Sea Urchin, Big Island Hawaii

A barnacle reaching out to grab some food

Heterocentrotus mamillatusn is a species of tropical sea urchin from the Indo-Pacific region.

Fire worm underwater macro photography Sea life Scuba diver point of view

Close up of the retracted tentacles of a Red of Soft Coral in the St. Lawrence River.

Purple Sea Urchin Close Up Underwater Southeast Alaska

Sea Urchin, Variable Fire Urchin, Asthenosoma varium, Coral Reef, Lembeh, North Sulawesi, Indonesia, Asia

3d Animation Sea Anemones in the Color Depths (Depth Of Field)

$A feeding Fungiid Coral by night, probably a Fungia granulosa (quite thick septa, alternating long and short). \nFungia, also known as mushroom coral due to the distinctive mushroom-like appearance, is a type of solitary hard corals, meaning they grow individually and do not form colonies like some other coral species.\nTriton Bay, Indonesia \n3°54'2.976 S 134°6'24.192 E at 6m depth$

Stylocidaris affinis, also known as pencil urchin or red lance urchin, is a species of sea urchin.

Fire worm underwater Sea life Scuba diver point of view

Giant Acorn Barnacle Feeding using Cirri, Balanus nubilus, Monterey, California; Arthropoda; Crustacea; Thoracica; Balanidae

Beautiful underwater scene with sea urchin in aquarium in Dusseldorf, Germany. Tropical scenery.

Bearded Fireworm (Hermodice carunculata) Underwater Mediterranean Sea

$Blue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \nAstropyga radiata is mostly nocturnal and feeds by grazing on algae. The mouth is at the centre of the oral (under) surface where there are five powerful teeth.\nThis urchin is light sensitive and can angle its spines towards an approaching threatening object, but rather than centralized eyes, Astropyga radiata has a distributed sensory system. Funny thing is that many people think the thing in the middle is the eyeball, but it is the rectum. \nThe sexes are separate in Astropyga radiata. Eggs and sperm are liberated into the water column. After fertilisation, the larvae are planktonic and develop through several stages before settling on the seabed. \nLembeh Strait, Indonesia \n1°27'13.104 N 125°14'14.634 E at 12m depth$

A beautiful purple and pink hairy squat lobster hides in a crevice on a sponge.

Sea life Orange coral from scuba diver point of view

Underwater marine life, sea urchin Echinometra viridis, commonly called reef urchin, Caribbean sea, Central America

Red pencil urchin, Heterocentrotus mamillatus, in a brilliant red color typical of specimens near Hawaii.

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