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Mediterranean purple sea urchin - Sphaerechinus granularis

Purple Sea Urchin Close Up Underwater Southeast Alaska

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

Serene underwater environment surrounding Boracay Island, located in the Philippines. The image showcases a stone coral formation with a black urchin resting upon it. The black urchin is characterized by long, slender needles. The underwater scene features clear blue water with visible sunrays, adding a touch of natural illumination to the photograph.

The Urchin Cardinalfish (Siphamia fuscolineata) is a small but striking species of fish commonly found in the Indo-Pacific region. They have a slender body with a distinct black stripe running from the eye to the tail, and a vibrant red coloration on their fins and tail. As their name suggests, they are often found living among the spines of sea urchins, using them as a natural shelter. They are also known to form schools and are popular among aquarium enthusiasts due to their unique appearance.

Background of Kina Shells with differential focus. The focus is on the top Kina Shell. This photo is in soft focus.

Diadem sea urchin (Astropyga pulvinata) in the sea of Cortez (Mexico)

Centrostephanus longispinus, the hatpin urchin, is a species of sea urchin in the family Diadematidae. There are two subspecies, Centrostephanus l. longispinus, found in the eastern Atlantic and Mediterranean Sea and Centrostephanus l. rubricingulus, found in the western Atlantic.

Sea urchin Evechinus chloroticus on rock covered with layer of sediment and some vegetation.

Sea Urchin on Rock Near Ocean Background

$Blue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \n\nAstropyga radiata is mostly nocturnal and feeds by grazing on algae. The mouth is at the centre of the oral (under) surface where there are five powerful teeth.\nThis urchin is light sensitive and can angle its spines towards an approaching threatening object, but rather than centralized eyes, Astropyga radiata has a distributed sensory system. Funny thing is, a lot of people think the thing in the middle is the eyeball, but the rectum. \n\nThe sexes are separate in Astropyga radiata. Eggs and sperm are liberated into the water column. After fertilisation, the larvae are planktonic and develop through several stages before settling on the seabed. \n\nLembeh Strait, Indonesia \n1°28'56.394 N 125°15'15.588 E at 8m depth$

Sea Urchins, California. Strongylocentrotus purpuratus

Sea urchins or sea urchins are round and spiny black animals in the Echinoidea class.

This image shows several sea urchins, with one opened to reveal its bright yellow insides. The sea urchin's shell is covered with black spines, creating a sharp contrast. The background consists of light-colored ice, highlighting the details of the sea urchin.

Black Long Spines Sea Urchin (Diadema Setosum) Invertebrate Marine Life

Sea Urchin Echinoderm Underwater Sea life

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

$Asthenosoma varium is a large urchin (25 cm) with flattened, flexible test (the plates are articulated rather than fused). Very mobile, short spines, arranged in rectangular areas, separated by spineless areas. Spines have a blue swelling close to the tip, filled with venom.Living in bay, lagoon, external reef; on sandy or rubble bottoms. The flexible test allows, changing the shape, to enter very narrow crevices. The swollen shape of the spines and the flexible test are unique features. \nAsthenosoma varium sting can be very painful, a strong local pain due to venom injection can last for hours.\nThis specimen was encountered in a very shallow tunnel in the Triton Bay, Indonesia \n3°54'51.39 S 134°7'24.81 E at 2m depth$

sea urchin isolated on the black background

Sea urchin shells . Round green shells , macro image

Black sea-urchin standing on the yellow wood.

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