|ID||Michel: 117-118 Scott: 85, 106 Stanley Gibbons: 113-114 Yvert: 118-119 UPU: N/A Category: pF|
|Stamps in set||2|
|Value||MK 0,40- Trilobiet Asaphus
MK 9,00- Gastropode 'Euomophalus' should read 'Euomphalus'.
|Size (width x height)||25mm x 45mm|
|Layout||Two sheets 20 stamp each (4x5)|
|Printed by||The House of Questa|
|Issuing Authority||Aland Posten|
Jomala Island - the best place to look for fossils at Aland -(Aland 2011)
Trilobites (meaning "three lobes") are a well-known fossil group of extinct marine arthropods form the class Trilobita.
The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (521 million years ago), and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, all trilobite orders except Proetida died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years.
Trilobites had many life styles; some moved over the sea-bed as predators, scavengers or filter feeders and some swam, feeding on plankton.
The exoskeleton is composed of calcite and calcium phosphate minerals in a protein lattice of chitin that covers the upper surface (dorsal) of the trilobite and curled round the lower edge to produce a small fringe called the "doublure". Three distinctive tagmata (sections) are present (can be easiely seen on the stamp): cephalon (head); thorax (body) and pygidium (tail).
The Gastropoda or gastropods, more commonly known as snails and slugs, are a large taxonomic class within the phylum Mollusca. The class Gastropoda includes snails and slugs of all kinds and all sizes from microscopic to large. There are many thousands of species of sea snails and sea slugs, as well as freshwater snails, freshwater limpets, land snails and land slugs.
Euomphalus is characterized by a closely coiled shell with a depressed to slightly elevated spire and a channel-bearing angulation (a selenizone) on the upper surface of the whorls. The lower surface of the whorls is rounded to angular.
|FDC (also available with individual stamps), back side of the FDC||FDC (Mailed FDC from Aland to Germany: back side of the FDC)|
|Pairs: two mini sheets of the same stamps are printed as one sheet, then cut in two.||Mini Sheet|
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Latest update 21.10.2017
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