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Dreissena image of different stripe patterns. Dreissena have prominent dark and light banding on the shell but can have many different variations. The outer covering is a well polished light tan color with dark bands that can either be smooth or zigzagging in shape. The shell shape is either trigonal or triangular with sharply pointed umbos.
The taxonomic term Bivalvia was first used by Linnaeus in the 10th edition of his Systema Naturae in 1758 to refer to animals having shells composed of two valves. [3] More recently, the class was known as Pelecypoda, meaning "axe-foot" (based on the shape of the foot of the animal when extended).
Pectinida is a taxonomic order of large and medium-sized saltwater clams, marine bivalve molluscs, commonly known as scallops and their allies. [1] It is believed that they began evolutionarily in the late Middle Ordovician epoch; many species, of course, are still extant.
Hinge area in one valve of an oyster shell (), showing the groove that is the resiliferA resilifer is a part of the shell of certain bivalve mollusks.It is either a recess (a pit or groove of some sort) or a process, the function of which is the attachment of an internal ligament, which holds the two valves together.
In bivalves at least, the shape does change through growth, but the pattern of growth is constant. At each point around the aperture of the shell, the rate of growth remains constant. This results in different areas growing at different rates, and thus a coiling of the shell and a change in its shape - its convexity, and the shape of the ...
We’re ready for a whole new set of explorations in 2025 with picks for 25 top places to visit. Take cues from the worst-behaved travelers of 2024 for what not to do in the year ahead.
Image credits: John JLover “These are the type of movies that the world needs right now more than ever. Inspiring, uplifting, exciting and emotional. At times difficult to watch but so real and ...
We just know that even five minutes getting to hug an owl would cure us of all our troubles. This is truly such a special treat. Of course, it seems like the person giving the owl a cuddle is most ...