Examples of 'periostracum' in a sentence
Meaning of "periostracum"
periostracum (noun) - Periostracum is a biological term used to describe the outermost organic layer of a mollusk's shell. It serves to protect the shell and can have different colors and textures depending on the species. The periostracum is produced by the mantle of the mollusk
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- The proteinaceous outer sheath of many molluscan shells.
How to use "periostracum" in a sentence
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periostracum
The periostracum and operculum were not observed.
They have a thick layer of periostracum on their shells.
The periostracum of the shell surface has no hairs.
As in other animals of this genus lacks the periostracum and operculum.
Under the periostracum the shell is yellow.
Its color is white covered by a very light olive gray periostracum.
The periostracum of brachiopods is made of chitin.
Mantle collar tissue was found to produce periostracum when placed in vitro.
The periostracum is tufted and the operculum is large.
The outer surface is covered by a thin glossy layer of protein called periostracum.
Periostracum is absent in this family.
The hairy and brown periostracum completely covers the shell.
Periostracum is smooth.
The role of different cell types in the formation of the periostracum has been discussed.
The periostracum is brown with transverse spirals of short hairs.
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The shell has a persistent thin periostracum which extends beyond the valve margins.
The periostracum is thin and covered with a thick ferruginous deposit.
It is white, covered with a pale yellow periostracum.
Details of the periostracum can sometimes be very helpful in identifying a species.
The surface is white, covered with a blackish olive periostracum.
The periostracum is yellowish.
These mussles are characterized by a periostracum with long, stiff, flat bristles.
The periostracum is shiny.
The parietal wall is covered by a thick callus, which gives the periostracum a continuous appearance.
The periostracum is thin and the ligament connecting the two valves is narrow.
In life, the shell is covered in a yellowish-brown periostracum.
The periostracum is very often a different color than the underlying layer of the shell.
The shell is covered with a thin, horn-covered periostracum.
The thin brown periostracum layer that covers the shell flakes off in strands.
Small defects of margin, erosions, scratches, periostracum partly preserved.
Periostracum Sporopollenin Tectin Structure of the conchiolin cases of the prisms in Mytilus edulis.
The periostracum is olive-green.
Periostracum is thin, yellow, smooth and translucent.
The periostracum is present, but an operculum is not.
The periostracum is smooth, and the operculum is large.
The periostracum is tufted, and the operculum is small.
The periostracum is conspicuous, smooth or vermiculate.
The periostracum is smooth, and the operculum is small.
Its periostracum is thick, hard and a dark brown colour.
The periostracum is smooth, and the operculum is moderate in size.
The periostracum is smooth, and the operculum is moderate to large.
The periostracum is smooth and thin, and the operculum is small.
The periostracum is smooth, and the operculum has not been observed.
The periostracum is tufted and ridged, and the operculum is moderate in size.
The periostracum is smooth and thin, and the operculum is of moderate size.
The periostracum is thin and smooth, and the operculum is small to moderate in size.
The periostracum (outer layer of the shell) is usually thin, and is often colored.
Periostracum is brown or yellowish-brown, and with greenish rays in young or pale-colored specimens.
The periostracum comprises an external lamella, 13 nm thick, and one sublamellar layer.
