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

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

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Macro photo with the needles of a pastel-colored cactus

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

Sea Urchin Echinoderm Underwater Sea life, Macro abstract background. sea urchin spines and teeth

Sea Squirt, Seescheide (Botrylloides leachii)

$Black Feather Star Colobometra perspinosa occurs in the tropical Indo-West Pacific in a depth range from 0-122m, max. diameter 46cm. Colobometra perspinosa has only ten arms. Although many crinoid species have 10 arms as juveniles and add more with growth, this species does not.\nColobometra perspinosa is often clinged to gorgonians, like this specimen, exposed the open arms to the marine flow to optimise the nutriment capture. \nThe coloration is usually black but it can also be black and white, and even brown-gold for rare specimen.\nTriton Bay, Kaimana Regency, West Papua Province, Indonesia \n3°58'43.566 S 134°10'2.268 E at 12m depth$

Red Pencil Sea Urchin, Big 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.

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

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

$Tube Anemone Cerianthus filiformis is a species of marine Cnidaria in the family Cerianthidae.\nThe species is widespread throughout the tropical waters of the Indo- West Pacific in a depth range from shallow to 100m, has a stretched and muscularised body which can reach 35 cm.\nCerianthus filiformis lives in a mucous tube which is sunk in the soft substrate The animal shows only its tentacles to feed, usually at night time. The species feeds on small planktonic organisms, tiny crustaceans, larval forms, and other minute organisms drifting in the water column. The long, slender tentacles of Cerianthus filiformis are equipped with cnidocytes (stinging cells) that help capture prey. \nLembeh Strait, North Sulawesi, Indonesia \n1°27'34.836 N 125°13'17.046 E at 8m depth by night$

Sea urchin needles sharp poisonous dangerous sucker feet tentacles and mouthparts close up organism movement.

Purple Sea Urchin Close Up Underwater Southeast Alaska

Spiny black sea urchin (Diadema setosum) grazing on algae in tropical coral reefs. Vital for reef ecosystem balance.

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

Sea life Orange coral from scuba diver point of view

Crown-of-thorns starfish (Acanthaster planci), Zanzibar, Tanzania

$Tubifer Cardinalfish Siphamia tubifer (ex. Siphamia versicolor) occurs in the tropical Indo-West Pacific from the Red Sea south to Madagascar and east through the Maldives, Sri Lanka and India to the Andaman Sea Islands and to Western Australia, north to the Ryukyus andthroughout the Indo-Malayan region to Vanuatu in a depth range from 1 to 100m, usually to 18m depth, max. length 7cm. \nThe species forms small groups with long-spined urchins, but is also found among the spines of Acanthaster planci. Siphamia tubifer feeds on zooplankton and small invertebrates. The specimen encountered in this Blue Spotted Sea Urchin Astropyga radiata is dark brown. Depending on the phase the species can be striped instead.\nBlue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \nLembeh Strait, North Sulawesi, Indonesia \n1°28'47.814 N 125°15'1.26 E at 23m depth$

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

Image of the plumage at a carnaval parade

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