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

Red Pencil Sea Urchin, Big Island Hawaii

Sea life Orange coral from scuba diver point of view

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

Closeup beautiful Banksia flower, macro, background with copy space, macro, full frame horizontal composition

Sea Squirt, Seescheide (Botrylloides leachii)

Macro abstract photo of dandelion plant under RGB colored light for technology and science concept. No people are seen in frame. Shot with a macro lens.

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

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

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

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

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

Purple Sea Urchin Close Up Underwater Southeast Alaska

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

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

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

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

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

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

Macro photo with the needles of a pastel-colored cactus

$In the tropical Indo-West Pacific from Tanzania to Japan, Australia and Kiribati in a depth range from 4 to 25m, max. length 15mm. The shrimp maintains a commensal relationship with feather stars, meaning it benefits by receiving protection and feeding opportunities from organic particles the feather star captures, while the feather star is unaffected by its presence. The shrimp primarily scavenges on the bits of organic debris or plankton caught by the feather star's feeding structures. \nPontoniopsis comanthi is known to be associated with crinoid species of Comanthus, Comatula, Heterometra, Lamprometra and Tropiometra. \nLembeh Strait, North Sulawesi, Indonesia \n1°28'56.394 N 125°15'15.588 E at 8m depth$

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.

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

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