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The shells of bivalves in this family are fragile and have a long and triangular shape, and in life the pointed end is anchored in sediment using a byssus.The shells have a thin but highly iridescent inner layer of nacre in the part of the shell near the umbos (the pointed end).
The rigid pen shell burrows as it grows, but the wide posterior end of the shell always remains exposed so water from above the seafloor can be drawn through the inhalent chamber of the mantle cavity. Typical of bivalves, water is drawn over gills or ctenidium by the beating of cilia where oxygen from the water is absorbed. Suspended food and ...
Pinna nobilis, known by the common names noble pen shell and fan mussel, is a large species of Mediterranean clam, a marine bivalve mollusc in the family Pinnidae, the pen shells. [2] It reaches up to 120 cm (4 ft) of shell length. [3] It produces a rare manganese-containing porphyrin protein known as pinnaglobin. [4]
The amber pen shell can be found in coastal western Atlantic waters, ranging from southern Florida across the Caribbean and the West Indies to Brazil. [2] [3] [4] [5]The amber pen shell is benthic and usually occurs in medium to coarse sand or mixed substrata (sand, gravel, rocks), in fine calcareous sandy mud of eelgrass (e.g. Zostera spp.), in sandy substrata of turtle grass (e.g. Thalassia ...
Pinna noblis shell & byssus. Shell. These pen shells can reach a length of about 80–90 cm (31–35 in). They are characterized by thin, elongated, wedge-shaped, and almost triangular shells with long, toothless edges. The surface of the shells shows radial ribs over their entire length.
A suspension study of A. pectinata showed that in artificial habitats, gonad development occurred at the same time for both male and female pen shells and corresponded to warming water temperatures and increased food availability. [6] A. pectinata is a broadcast spawner with external fertilization. [3]
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Pinna bicolor, also known as razorfish, razor clam, or pen shell, is a species of large saltwater clam in the family Pinnidae. It is commonly found in shallow waters up to 50 m (160 ft) deep. It can be found embedded in firm muddy intertidal sediments, seagrass beds, and reef flats along continental and island shores.