|
''Heterocentrotus mamillatus'', commonly known as the slate pencil urchin, red slate pencil urchin, or red pencil urchin, is a species of tropical sea urchin from the Indo-Pacific region. == Description == This species is a large sea urchin, with some speciems reaching over 8cm in diameter, with spikes up to 10cm. Most specimens are bright red, but brown and purple colorations are also seen. The spines may have a different color from the body. Spines have a white ring at their stem and have alternating light and dark rings. The spines are rounded to triangular in cross-section and taper towards the tip. Surprisingly during the night the red spines turn into a chalky pink. Specimens from Hawai‘i tend to have bright red spines, while specimens from other parts of the Pacific may have yellowish or brown spines. ''Heterocentrotus trigonarius'' is a similar species that has longer and darker spines, more angular, and is always monochromic. Red pencil urchin - Papahānaumokuākea.jpg|Red pencil urchin at French Frigate Shoals. Slate pencil urchin at Abu Basala.JPG|Brown ''H. mamillatus'' at the Red Sea Heterocentrotus mamillatus MHNT.jpg|Brown dried specimen MHNT Heterocentrotus mammillatus MHNT bouche.jpg|Brown dried specimen MHNT 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heterocentrotus mamillatus」の詳細全文を読む スポンサード リンク
|