Pallial sinus

The pallial sinus is an indentation or inward bending in the pallial line on the interior of a bivalve mollusk shell's valves that corresponds to the position of the siphons in those types of clams which have siphons (i.e. siphonate). The position of the pallial sinus is often clearly visible as a shiny line on the inside of the bivalve shell.^[1]^[2]^[3]

References

^ Huber, Markus (2010). Compendium of Bivalves. A Full-color Guide to 3'300 of the World's Marine Bivalves. A Status on Bivalvia after 250 Years of Research. Hackenheim: ConchBooks. pp. 901 pp. + CD. ISBN 978-3-939767-28-2, at p. 57
^ Bivalves by J.H. Leal, Bailey-Matthews Shell Museum, Florida, USA http://www.shellmuseum.org/BivalvesLeal.pdf
^ Leal, José H. (2020-01-10). "Telltale Shell Parts: The Pallial Sinus". shellmuseum. Retrieved 2024-06-02.

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[1] Huber, Markus (2010). Compendium of Bivalves. A Full-color Guide to 3'300 of the World's Marine Bivalves. A Status on Bivalvia after 250 Years of Research. Hackenheim: ConchBooks. pp. 901 pp. + CD. ISBN 978-3-939767-28-2, at p. 57

[2] Bivalves by J.H. Leal, Bailey-Matthews Shell Museum, Florida, USA http://www.shellmuseum.org/BivalvesLeal.pdf

[3] Leal, José H. (2020-01-10). "Telltale Shell Parts: The Pallial Sinus". shellmuseum. Retrieved 2024-06-02.

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v t e Bivalve anatomy
Shell	Callus Hinge line Hinge teeth Ligament Lira Lunule Nacre Pallial line Pallial sinus Periostracum Prodissoconch Resilifer Resilium Sculpture Umbo Valve Beak Annuli
Other hard parts	Byssus Pearl Sea silk
Soft parts	Adductor muscles Ctenidium Gastric shield Mantle Nephridium Siphon
Other	Abductin Glochidium Pseudofeces Trochophore Veliger