An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms

by Paul S. Mikkelsen

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Term Definition

EXTRAPALLIAL FLUID   That fluid between MANTLE and the PERIOSTRACUM, which is rich in CaCO3 in solution, which precipitates out, forming the shell.
   

PALLIAL   Pertaining to the MANTLE, or the region of the GILLS.
   

PALLIAL CAVITY   [need definition].
   

PALLIAL LINE   On the inside of some bivalve shells, a linear scar marking the attachment of the margin of the fleshy MANTLE to the shell. See illustration: Composite Bivalve. See also: INTEGROPALLIATE; MUSCULAR IMPRESSION; SINUPALLIATE.

See: Bivalve terminology, Anatomy of bivalves by Marlo Krisberg.
   

PALLIAL REGION   Marginal region of shell interior adjacent to PALLIAL LINE.
   

PALLIAL RETRACTOR MUSCLE   Muscle withdrawing marginal parts of MANTLE within bivalve shell where there is no distinct line of muscle attachment.
   

PALLIAL SINUS   A notch or EMBAYMENT in the PALLIAL LINE caused by the attachment of the siphon's retractile muscles. It may be deep, shallow, or absent... depending on the species. See illustration: Composite Bivalve. See also: INTEGROPALLIATE; SINUPALLIATE.

See: Bivalve terminology, Anatomy of bivalves by Marlo Krisberg.
   

TENTACLE, PALLIAL   A tentacle, in rissoids and some other MESOGASTROPODS, growing from the edge of the mantle skirt on the right side and occasionally also on the left. In turritellids, a whole series of pallial tentacles lies around the entrance to the MANTLE CAVITY.
   


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