Amber penshell
A species of Pinna Scientific name : Pinna carnea Genus : Pinna
Amber penshell, A species of Pinna
Botanical name: Pinna carnea
Genus: Pinna
Content
Description
Photo By Fritzmann2002 , used under CC-BY-SA-4.0 /Cropped and compressed from original 
Description
The amber pen shell has a pair of long, thin translucent valves held together by ligaments that run along the entire dorsal side of the bivalve. The bivalve is triangular with 8 to 12 low ribs radiating from the pointed anterior end (or umbo) to the large posterior edge. The exterior of the shell is usually a dull orange amber-like color and may have fragile, scale-like spines that often become eroded over time. The anterior end is usually buried and attached by byssal threads, whereas its wider posterior gaping end extends above the sea bottom surface to facilitate filter-feeding. Algae (e.g. Lobophora variegata) and invertebrates such as sponges and encrusting corals tend to grow on the exposed part of the shell and may camouflage it very well.
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Scientific Classification
Phylum
Molluscs Class
Bivalve shell Order
Oysters and allies Family
Pen shells Genus
Pinna Species
Amber penshell 
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