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

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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

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. The 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. Astropyga 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.This 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. The 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. Lembeh Strait, Indonesia 1°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.

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

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

Red Pencil Sea Urchin, Big Island Hawaii

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

Eucidaris thouarsii, the slate pencil urchin, is a species of cidaroid sea urchins that inhabits littoral regions of the East Pacific Ocean. Sea of Cortez, Mexico. Underwater.

Sea Urchin Toxopneustes maculatus is a rare species of sea urchin found in the Indo-West Pacific. But the records are sparse. Specimens (mostly tests) have been reported from scattered localities in e.g., Réunion, Christmas Island, Palmyra Atoll, Marquesas/Nuku Hiva.The generic name Toxopneustes literally means poison breath, derived from Greek. No wonder: Toxopneustes maculatus is probably very poisonous. Toxopneustes pileolus (a congener) is well known to produce medically significant stings. If the poison of Toxopneustes maculatus can kill humans under circumstances or not, do not try. Treat this beauty as potentially hazardous! This is a close-up of the lateral surface of the sea urchin. Nuku Hiva, Marquesas, French Polynesia 8°56'15.57 S 140°5'43.038 W at 19m depth

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

Sea Urchin Echinoderm shell texture. Underwater Sea life, Macro abstract background.

An electric blue fish swims among coral and sea urchins

Macro detail yellow and white king protea

starfish ultra macro beam hand with suction cups. marine animals of the world ocean with a large zoom

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

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

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

Sea Squirt, Seescheide (Botrylloides leachii)

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

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.

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