echinometridae

Adaptations of the amazing Shingle Urchin

The Shingle urchin, Colobocentrotus atrata (Echinometridae), has a peculiar limpet-life morphology, unique among the regular echinoids. 

The aboral spines of Colobocentrotus atrata (on the opposite side to the mouth) are extremely reduced, forming a smooth pavement or plates, and the adoral part (situated near the mouth) is surrounded by a basal skirt of flattened spines. These two features improve the adhesive capacities of the animal and are adaptations to life in areas of extreme wave exposure throughout the Indo West Pacific where this sea urchin lives.

[Source

Photo credit: Shingle urchin in Pu’uhonua o Honaunau National Historical Park, Hawaii (the big island), Hawaii | ©Marlin Harms 

Rock Boring Urchin (Echinometra lucunter)

…a species of Echinometrid sea urchin, which occurs in shallow areas in the western Atlantic Ocean and Caribbean Sea. Like other sea urchin species E. lucunter will feed on a range of marine plants and algae. True to its common name E. lucunter uses the teeth on its Aristotle’s lantern to grind away at rock allowing it to conceal itself. 

Classification

Animalia-Echinodermata-Echinoidea-Echinacea-Camarodonta-Echinometridae-Echinometra-E. lucunter

Image: Hans Hillewaert

Slate pencil urchin / パイプウニ

Heterocentrotus mammillatus

Slate pencil urchin
Since it is nocturnal, it remains hidden behind a rock during the day.
While hiding in a rock, its needles are fixed strongly by the function of the catch apparatus, a connective tissue unique to the echinoderm. パイプウニ
夜行性なので昼間は岩の間に隠れてます。
隠れている間は、キャッチ結合組織(棘皮動物に特有の結合組織)の働きでトゲで強力に固定しています。


Animalia Echinodermata Echinoidea Camarodonta Echinometridae
動物界 棘皮動物門 ウニ綱 拱歯目 ナガウニ科

The picture was taken at Sumida Aquarium, Tokyo, Japan.

Pencil urchin - Heterocentrotus mammillatus by Okinawa Nature Photography on Flickr.

Via Flickr:

Pencil urchin - Heterocentrotus mammillatus
Dive Location: Kadena steps -RDB
Okinawa-Japan
Depth: 5feet on rocks feeding at night

Slate Pencil Urchin - Heterocentrotus mamillatus

The characteristic spines of the sea urchin Heterocentrotus mamillatus (Echinoida - Echinometridae) really seem crayons, hence its common name.

Spines of sea urchins are appendages that are associated with defense, locomotion, and food gathering. Spines form an important part of an urchin’s maintenance mechanisms, and it is no surprise to find that they are repaired rapidly once damaged.

This species is found in tropical waters of Eastern Africa, Kenya, Madagascar, Marsa Shagra, Mascarene Basin, Mauritius, Red Sea, Seychelles and the West Indian Ocean.  

Other common names: Red slate pencil urchin, Red pencil urchin.

References: [1] - [2] - [3]

Photo credit: ©Russell Gilbert | Locality: Oahu, Hawaii (2014)

Heterocentrotus mammillatus / パイプウニ

Heterocentrotus mammillatus

パイプウニ Slate pencil urchin


Animalia Echinodermata Echinoidea Camarodonta Echinometridae
動物界 棘皮動物門 ウニ綱 拱歯目 ナガウニ科

Waikiki Aquarium, Honolulu, Hawaii, United States.
ワイキキ水族館@ハワイ州ホノルル

Anthocidaris crassispina / ムラサキウニ

Anthocidaris crassispina

A sea urchin stuck to my hand. ムラサキウニがくっ付いた。


Animalia Echinodermata Echinoidea Camarodonta Echinometridae
動物界 棘皮動物門 ウニ綱 拱歯目 ナガウニ科

The picture was taken at Awashima Marine Park, Shizuoka, Japan.

Anthocidaris crassispina / ムラサキウニ

Anthocidaris crassispina

ウメボシイソギンチャクの中にはまっているムラサキウニ。 The Anthocidaris crassispina being stuck in the colony of Beadlet anemone.


Animalia Echinodermata Echinoidea Camarodonta Echinometridae
動物界 棘皮動物門 ウニ綱 拱歯目 ナガウニ科

Tokyo Sea Life Park, Tokyo, Japan.
葛西臨海水族園@東京都江戸川区

Kina / キナ

Evechinus chloroticus

キナ
キナはニュージーランドに生息するウニ。「キナ」はマオリ語です。
なまこも写っていますよ! Kina
The Kina is a sea urchin endemic to New Zealand.
“Kina” means “sea egg” in the Maori language.
A sea cucumber is also here!


Animalia Echinodermata Echinoidea Camarodonta Echinometridae
動物界 棘皮動物門 ウニ綱 拱歯目 ナガウニ科

Ecoworld Aquarium, Picton, New Zealand.

Anthocidaris crassispina / ムラサキウニ

Anthocidaris crassispina

Anthocidaris crassispina is fit to eat. ムラサキウニは食用に適する。

Classification
Animalia Echinodermata Echinoidea Camarodonta Echinometridae
動物界 棘皮動物門 ウニ綱 拱歯目 ナガウニ科

Photo taken at Kamogawa Seaworld, Chiba, Japan