Stamp: Smooth Hammerhead (Sphyrna zygaena) (British Indian Ocean Territory 1968)
Smooth Hammerhead (Sphyrna zygaena) (British Indian Ocean Territory 1968)
23 October (British Indian Ocean Territory ) within release Marine Animals goes into circulation Stamp Smooth Hammerhead (Sphyrna zygaena) face value 10 Seychellois cent
| Stamp Smooth Hammerhead (Sphyrna zygaena) in catalogues | |
|---|---|
| Michel: | Mi:IO 17 |
Stamp is square format.
Also in the issue Marine Animals:
- Stamp - Blue Shark (Prionace glauca) face value 15;
- Stamp - Spotted Eagle Ray (Aetobatus narinari) face value 20;
- Stamp - Somali Butterflyfish (Chaetodon leucopleura) face value 25;
- Stamp - Yellowtail Emperor (Lethrinus crocineus) face value 5;
- Stamp - Smooth Hammerhead (Sphyrna zygaena) face value 10;
- Stamp - Brassy Trevally (Caranx celetus) face value 40;
- Stamp - Yellowfin Needlefish (Tylosurus leiurus) face value 45;
- Stamp - Pickhandle Barracuda (Sphyraena jello) face value 50;
- Stamp - Steephead Parrotfish (Chlorurus strongylocephalus), face value 75;
- Stamp - Giant Hermit Crab (Petrochirus diogenes) face value 1;
- Stamp - Wrasse face value 1.50;
- Stamp - Areolate Grouper (Epinephelus areolatus) face value 2.25;
- Stamp - Black Marlin (Makaira indica) face value 3.50;
- Stamp - Whale Shark (Rhincodon typus) face value 5;
- Stamp - Red Lionfish (Pterois volitans) face value 10;
Stamp Smooth Hammerhead (Sphyrna zygaena) it reflects the thematic directions:
Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the Batoidea (rays and kin). Some sources extend the term "shark" as an informal category including extinct members of Chondrichthyes (cartilaginous fish) with a shark-like morphology, such as hybodonts. Shark-like chondrichthyans such as Cladoselache and Doliodus first appeared in the Devonian Period (419–359 million years), though some fossilized chondrichthyan-like scales are as old as the Late Ordovician (458–444 million years ago). The earliest confirmed modern sharks (selachimorphs) are known from the Early Jurassic around 200 million years ago, with the oldest known member being Agaleus, though records of true sharks may extend back as far as the Permian.
