Brachiopod Shell, Symmetry and Shell Shape

Youtube video link of this presentation: https://youtu.be/wEIi4SHscd4

Hello, In this video, Sumaiya Amin Titun described the Brachiopod shell, symmetry, and shell shape | Paleontology | Geology

Reference:

1.https://static.hwpi.harvard.edu/files/styles/os_files_xxlarge/public/trenton/files/brachconvexity.jpg?m=1525446811&itok=ro1zJeHyhttps://images.app.goo.gl/mcyFL2sTE4ksTqfQ7

2.https://trenton.mcz.harvard.edu/phylum-brachipopodahttps://www.slideshare.net/LeeannaCota/mollusks-bivalvesgastrocepha-marine

3.https://www.bgs.ac.uk/discovering-geology/fossils-and-geological-time/brachiopods/

4.https://www.digitalatlasofancientlife.org/learn/brachiopoda/

5.https://fossiilid.info/64?mode=in_baltoscandia&lang=en






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#brachiopoda #paleontology #shell #shape #geology #symmetry
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1. How to describe a Brachiopod Shell, Shape of Shell, Symmetry etc. Sumaiya Amin Titun

2. Brachiopoda Brachiopods are marine invertebrates, meaning they have no backbone, and are one of the few animal groups that live only in the ocean. The name ' Brachiopoda ' comes from the Greek words ' brachion " (=arm) and "podos" (=foot). They are sometimes referred to as 'lamp shells' since certain groups. Fig: Brachiopoda

3. Brachiopod Shell Living brachiopods are normally attached to rocks, shells, or other objects with the help of pedicle. The two valves articulate along a hinge line, which carries teeth and sockets . In brachiopods, the larger valve contains teeth and the smaller valve contains sockets. The earliest part of the valve is called beak and the rounded part adjacent to the beak is called umbo .

4. Description of Shell The shell is bilaterally symmetrical with the plane of symmetry passing through the pointed posterior beak and rounded anterior margin. It bisects each valve in brachiopods. The beak or pointed part is posterior and the opposite round margin is anterior . The line along which the valves are in contact is the commissure .

5. The Shell 1.Anterior and Posterior Anterior: The shell margin where the valves separate and open that is anterior. Posterior: Opposite direction defined by the position of Hinge line or pedicle opening is posterior.

6. The Shell 2. Dorsal and Ventral During life, the pedicle valve is commonly larger and situates in a superior position, and the brachial valve in a lower position. The direction away from the pedicle valve is learned Ventral and away from the brachial valve is named Dorsal. .

7. Shell Shape OUTLINE Brachiopod shells have diverse shapes. The simplest forms are elliptical, subcircular, or semi-elliptical. Shell shape can be shown in the dorsal view and lateral view.

8. Shell Shape CONVEXITY The pedicle valve is always convex. Depending upon the brachial valve, the shape is termed differently. We can classify it into different 9 kinds.

9. Symmetry Brachiopods have a plane of symmetry that cut across the two valves. Bivalves usually have a plan of symmetry between the valves of the shell, which are mirror images of each other; most brachiopods have a plan of bilateral symmetry through the valves and perpendicular to the hinge.

10. Bilateral Symmetry Symmetry in which similar anatomical parts are arranged on opposite sides of a median axis so that only one plane can divide the individual into essentially identical halves. Brachiopods have this kind of symmetry.

11. References : https://static.hwpi.harvard.edu/files/styles/os_files_xxlarge/public/trenton/files/brachconvexity.jpg?m=1525446811&itok=ro1zJeHyhttps://images.app.goo.gl/mcyFL2sTE4ksTqfQ7 https://trenton.mcz.harvard.edu/phylum-brachipopodahttps://www.slideshare.net/LeeannaCota/mollusks-bivalvesgastrocepha-marine https://www.bgs.ac.uk/discovering-geology/fossils-and-geological-time/brachiopods/ https://www.digitalatlasofancientlife.org/learn/brachiopoda/ https://fossiilid.info/64?mode=in_baltoscandia&lang=en

12. Thank You for your Patience