Slate Pencil Urchin Heterocentrotus mamillatus
This species is a large sea urchin, with some specimens reaching over 8 cm in diameter, with spikes up to 10 cm. Most specimens are bright red, but brown and purple colourations are also seen. The spines may have a different colour from the body. Spines generally have a white ring at their stem and have alternating light and dark rings. Surprisingly, at night, the red spines turn into a chalky pink. This species can be found throughout the tropical waters of the Indo-Pacific region (from the east coast of Africa to the Pacific archipelagos). It is found in reefs in depths from 8 to 25 metres. Sea urchins are primarily marine grazers and tend to eat the algae in closest proximity to them. H. mammillatus predominantly feeds on encrusting coralline algae. The main predator is fish although its thick, rounded magnesium calcite spines allows it to bore into hard substrates and defend itself against predators, wave drag, and pressure.
Keeled Heart Urchin Brissus latecarinatus
This sea urchin is found around tropical to mid-latitude countries, mainly in the Indo-Pacific, Atlantic, and Mediterranean, in shallow water sands to shell gravels at depths of 1 to 45 m. It belongs to the Family Brissidae and is identifiable because of the star visible on the armour casing which is covered with spines. They feed on plants and small invertebrates found between sand particles. Fertilisation is external and brooding is common.
Cuming's Sea Star Neoferdina cumingi, is native to the tropical Indo-Pacific region. This starfish has a wide variety of colour forms and is typically symmetrically patterned with distinctive spots and the tip of each arm curling upwards. Although the feeding habits of this starfish have not been studied, it is part of the order Valvatida, and starfish in this order typically evert their stomach to engulf and digest their food before retracting the stomach back into the disc. Like other starfish, this species is likely to be able to reproduce asexually after splitting apart. Some members of Valvatida are hermaphrodites and others have separate sexes. The larvae are planktonic and drift with the currents for about four weeks finding shallow water areas in which to settle, often at a considerable distance from their origins.Brittle Star Macrophiothrix demessa
|Set of 4 stamps||$8.80|
|First Day Cover with 4 stamps||$10.30|
||Donna McKenna, Wellington. New Zealand
to you by:
|Printer:||Southern Colour Print, Dunedin, New Zealand
|Stamp size:||50.00mm x 35.71mm horizontal||
|Format:||Two vertical panes of 12 stamps with central gutter||
|Denominations:||$0.20c; $1.00; $3.00 and $4.60||
|Paper:||106gsm Tullis Russell Yellow-Green phosphor gummed stamp paper
|Period of Sale:
||23 October 2019 for a period of 2 years|