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searching for Periostracum 118 found (412 total)

alternate case: periostracum

Astarte borealis (1,386 words) [view diff] exact match in snippet view article find links to article

shape, color of periostracum, pallial sinus shape, and several others. The exterior characteristics of genus Astarte include the periostracum, ribs and overall

tulip snails and their allies. It is characterized by a silver or gold periostracum that is iridescent when wet, and a deep violet aperture. It is possibly

Both have oval and chalky-white or yellow shells with patches of brown periostracum (leather-like skin) on the shell. These clams are also commonly called

Both have oval and chalky-white or yellow shells with patches of brown periostracum (leather-like skin) on the shell. These clams are also commonly called

Tateidae, found in northern Tasmania, Australia. The shells look ovate and periostracum yellow with some pustules, length between 2.29 mm and 2.93 mm and width

The shell is made up of 3 layers: the top layer of organic material (periostracum), the middle thick layer of lime (ostracum) and the innermost, valuable

umbonal area is demarcated by three concentric furrows. The surface (periostracum) is very glossy, with prominent irregularly spaced concentric striae

9-2.1 mm. shell is slightly higher than wide and brown in colour. The periostracum bears ribs ( elevated, radial ridges) with characteristic spines. The

just behind the mid point and described as fairly narrow. The surface (periostracum) is slightly glossy and has coarse, irregular concentric striae. The

concentric striations. The umbos are slightly behind the middle. The Periostracum is silky, scarcely glossy. In colour it is whitish to grey-brown and

typified by Pleurotoma penicillata Carpenter which in sculpture and periostracum closely resemble the African Melatoma but their operculum has an apical

with broad, rounded umbos which are behind the midpoint. The surface (periostracum) is glossy with fine concentric striae. Numerous pores are visible inside

shell is fragile, fairly glossy and pearl grey to white in colour. The periostracum (surface) is ornamented with fine, even, concentric striation. The native

oval shape. It has centrally placed low, rounded umbos. The surface (periostracum) is dull or silky with very fine irregular concentric striations. The

The umbos are broad well and well behind the midpoint. The surface (periostracum) is glossy with regular concentric ribbing. The colour is grey to cream

midpoint. The umbos are demarcated by a shallow furrow. The surface (periostracum) is silky, with regular concentric striae. The species is native to Europe

has broad, swollen umbos which lie behind the midpoint. The surface (periostracum) is very glossy, with irregular, concentric striae. The colour is yellow

common name Globular Pea Shell. The central umbos is prominent. The periostracum (surface) is silky glossy and sculptured by fine, regular striae. In

flattened umbos near the midpoint. The colour is yellowish-white and the periostracum (surface) is silky with fine, concentric striation. P. conventus is a

notch narrow, deep; shell color pure white, interior of aperture white; periostracum thick, velvety." The shell of the Polystira lindae resembles a cone with

The aperture is elliptical and lacks an internal rib. The surface (periostracum) is white or pale yellow-brown. The shell often (but not always) has

species; light brown inflated bubble shell;: the brown color comes from the periostracum, covering the shell; this flakes off when the snail dies; juveniles have

(Original description) The small, solid, chalky shell has an olivaceous periostracum. It is decollate with about 4½ remaining whorls. The suture is obscure

10 mm. (Original description) The solid, white shell has an olivaceous periostracum. The spire of the holotype is badly eroded, short, indicating a total

(Original description) The short-fusiform shell is white, with a pale olive periostracum. The tip is eroded. The shell contains six or more subsequent whorls

a fusiform shape. The shell is uniform white with a yellowish-olive periostracum. It contains 14-15 whorls, flat-sided and rather deep. The aperture is

or amber-red. (R.Tucker Abbott -1968- "Seashells of North America") Periostracum is thin, yellowish. The minimum recorded depth for this species is 0

The shell is of moderate size. It is white, covered with a pale yellow periostracum. The acute spire is a little shorter than the aperture. The six whorls

blunt (defective) protoconch. They are white with a pale olivaceous periostracum, short and stumpy. The earlier whorls show two strong peripheral keels

These shells are yellowish-white, with rust-colored stains and a dark periostracum. The posterior margin is slightly sinuous. "ITIS Standard Report Page:

or brown. Unlike most bivalves, the Olympia oyster's shell lacks the periostracum, which is the outermost coating of shell that prevents erosion of the

15 characteristic, regularly spaced striae per whorl, 30 on the last; periostracum absent (?); color typically pinkish, reddish or dark purple, inside creamy

5.5 mm. (Original description) The white shell has a pale olivaceous periostracum. It contains five whorls exclusive of the (lost) protoconch. These are

scattered tan, crescent-shaped flammules; interior of aperture white; periostracum thin, pale tan, with tufts along shoulder." The maximum recorded shell

solid shell consists of six or more whorls. The apex is decollated. The periostracum is greenish olive over a white substratum, yellowish on the columella

greenish-yellowy shell; large, barrel-shaped body whorl covered by a rust periostracum; involute (= sunken) spire; long aperture; outer lip gradually increasing

7 in). These small and compact shells shows violet rays and a glossy periostracum. This species can be found in the East Pacific. WoRMS Sol Felty Light

The shell is of moderate size. It is white, covered with a pale yellow periostracum. The acute spire is a little shorter than the aperture. The six whorls

with the protoconch eroded. It is whitish with a dark dull olivaceous periostracum and about five remaining whorls. The suture is appressed, with a broad

shell is short-fusiform and stout. It is white with a pale yellowish periostracum. It contains about seven whorls. The apex is defective. The subsequent

siphonal canal carries two or three much stronger spiral threads. The periostracum is pale and fibrous. The suture is distinct but not deep. The aperture

short, stout, biconic shell is white or subtranslucent with a yellowish periostracum. The apical whorls are much eroded, indicating for the whole shell six

angulation well-defined, situated above the posterior adductor scar. Its periostracum is thick, hard and a dark brown colour. Its anterior adductor scar is

4 mm, its diameter 2 mm. The minute shell is white, with a yellowish periostracum. It contains about four whorls with a very minute subglobular hardly

maximum thickness of broken lip 0.1 mm. Surface dull, yellowish white, periostracum not evident, surface finely pitted. Protoconch and earliest teleoconch

25 mm. (Original description) The white shell has a thin, pale olive periostracum. The apex is invariably eroded, and the subsequent whorls, eight or more

or brown. Unlike most bivalves, the Olympia oyster's shell lacks the periostracum, which is the outermost coating of shell that prevents erosion of the

scattered tan, crescent-shaped flammules; interior of aperture white; periostracum thin, pale tan, with tufts along shoulder." The maximum recorded shell

insertion. The parietal wall is covered with a heavy callus, which gives the periostracum a completed aspect. This species occurs in the Pacific Ocean off Japan

sculpture for a short distance. The shell is white with a straw-colored periostracum. The axial sculpture consists of faint incremental striae. The spiral

the last whorl and has faint growth lines towards the helicocone. The periostracum (the outermost layer) of the shell is yellow in color. On the other hand

Aulacofusus (Limatofusus) timetus) The small, thin shall has a thin pale olive periostracum. Its length measures 30 mm. It contains five or more whorls. The protoconch

stout, solid, decollate, with a whitish substratum and strong olivaceous periostracum. The four remaining whorls are closely coiled and have the aperture longer

indistinct except for a thin glaze applied to body whorl. Shell whitish. Periostracum thick, deep amber brown, with strong, curved incremental growth lines

Aulacofusus (Limatofusus) timetus) The small, thin shall has a thin pale olive periostracum. Its length measures 30 mm. It contains five or more whorls. The protoconch

insertion. The parietal wall is covered with a heavy callus, which gives the periostracum a completed aspect. This species occurs in the Pacific Ocean off Japan

early whorls dark brown; shoulder coronations white; aperture white; periostracum smooth, translucent yellow; operculum unknown." The size of the shell

description) The thin, fusiform shell is white, with a pale yellowish periostracum,. It contains six whorls rounded, flattened a little over the anal fasciole

few scattered, crescent-shaped, red-brown flammules; aperture white; periostracum unknown." The size of the shell varies between 22 mm and 51 mm. Locus

shell is elongate-fusiform. it is white with a very thin translucent periostracum. It contains about eight whorls exclusive of the (lost) protoconch. The

It is regular, acute, whitish, with a warm yellow-brown persistent periostracum. The shell contains eight whorls, exclusive of the very minute (lost)

shell attains a length of 33 mm. It is covered with a straw-colored periostracum. It contains about six rounded whorls. The protoconch is eroded. The

spiral threads; shell color pure white; interior of aperture white; periostracum thin, yellow, translucent." The maximum recorded shell length is 20 mm

greyish white to salmon-orange when adult, with a light tan or dark brown periostracum. This species dwells on sand, weed, and mud flats from the low intertidal

description) The solid shell is livid purple under a very dark olive periostracum. It consists of about six whorls exclusive of the (lost) protoconch.

The elongate-conic shell is covered with a very pale, ashy, dehiscent periostracum, which in the type is absent on the base and columella and gives the

(Original description) The small, solid shell is white under an olivaceous periostracum. It has five (decollate) whorls. The suture is distinct, bordered by

the nucleus. The color of the shell is white with a gray, olivaceous periostracum, the aspect much like a stumpy Bela Leach, 1847. The suture is distinct

keel. The shell is light yellowish with a brown, reddish or greenish periostracum, radially and spirally weakly striated. The aperture is wide and almost

very narrow; body whorl, spire, and interior of aperture pure white; periostracum thin, transparent yellow." The maximum recorded shell length is 30 mm

reddish-brown blotches and numerous thin, hairlike flammules in between; periostracum thin, transparent. Holotype: Length 33 mm, width 17 mm, in sand near

color is of a livid purple. The shell is covered with an olivaceous periostracum, with about eleven whorls. The protoconch is more or less eroded, but

one above mid-body, one below mid-body; interior of aperture white; periostracum thin, pale brown, smooth." The maximum recorded shell length is 17 mm

small, thin shell measures 26 mm. It is white under a straw-colored periostracum. The shell contains more than six well-rounded whorls; the protoconch

centimetres (3.8 in). These shells are white, with 26 ribs and a dark, smooth periostracum. This species is present in the North Pacific Ocean (Mexico, El Salvador

32 mm. The large, white shell has a fusiform shape with a pale olive periostracum. The acute spire contains eight whorls, exclusive of the (lost) nucleus

It is brilliantly pearly inside. It is covered with a reddish-brown periostracum which becomes olivaceous on the base. The form is rather depressed with

The shell is rather small, stout, solid and chalky under an olivaceous periostracum. The spire is longer than the aperture. The shell contains at least eight

shell is subquadrate-ovate. It has a buff color, the remains of the periostracum is dark brown. The upper ribs are white and the shell is dotted with

one above mid-body, one below mid-body; interior of aperture white; periostracum thin, pale brown, smooth." The maximum recorded shell length is 17 mm

of shell diameterand sometimes slightly excentric. The colour of the periostracum is whitish or yellowish, sometimes with red hue and usually with two

color is of a livid purple. The shell is covered with an olivaceous periostracum, with about eleven whorls. The protoconch is more or less eroded, but

slightly smaller umbilicus, and more flattened over the sutures. The periostracum is olivaceous, polished, very thin and readily dehiscent. The operculum

numerous crescent-shaped orange flammules; interior of aperture white; periostracum brown, thick, and smooth." The size of the shell attains 20 mm. Locus

bands. Its body chamber is covered by a thick, gelatinous, and slippery periostracum. As it reaches the sub mature stage, most of its body chamber is white

moderate size with a length of 50 mm. It is white with a dull olive gray periostracum. It contains more than six well-rounded whorls.The protoconch is missing

description) The large, solid shell is chalky, with a rather thick olivaceous periostracum, and about seven whorls. The apex is eroded. The spire is much longer

with it at the posterior angle of the aperture, thus forming a complete periostracum. A prominent oblique fold is present on and a little anterior to the

radiating, pale salmon-orange flammules; interior of aperture white; periostracum thin, smooth, yellow, translucent." The maximum recorded shell length

concave surface. The body whorl shows shallow squarish channels. The periostracum is thin, pale straw color, finely axially striated. The color of the

size with a length of 30 mm. Its color is white under an olivaceous periostracum, with. The shell contains six well-rounded whorls exclusive of the (lost)

of shoulder with alternating brown and white dashes; aperture purple; periostracum thin, smooth, translucent yellow." The size of the shell varies between

than the aperture. The shell is white, with a thin polished, oUvaceous periostracum. The shell contains more than five whorls (the protoconch defective)

The shells are relatively thick, and wedge-shaped, with a polished periostracum. The muscular foot is used by the clam to dig rapidly back into the sand

the shell attains 25.1 mm. Color is light brown-beige, polished, and periostracum transparent. L. paiciorum resembles L. crytodon, but differs in having

9 in). These freshwater mussels have a dark brown or yellowish-green periostracum. The shells are equivalve, inequilateral and oval-shaped, with a rounded

pattern of evenly-spaced white flammules; protoconch large, mamillate; periostracum thin, translucent, smooth, with row of small tufts along shoulder carina

bright orange, crescent-shaped flammules; interior of aperture pink; periostracum thin, smooth, yellow." The maximum recorded shell length is 33 mm. Locus

the shoulder carina. The aperture of the shell is pale lilac, and its periostracum is thin, smooth and translucent yellow-brown." The length of the shell

diameter 20 mm. (Original description) The white shell has an ashy brown periostracum and six or more whorls, the apex eroded. The suture is slightly appressed

shell measures 37 mm. It is bulimiform, thin, whitish with a pale olive periostracum. The shell contains about six whorls, exclusive of the (lost) protoconch

aperture white with 2 brown bands, corresponding to external color bands; periostracum thick, brown, tufted along shoulder; animal bright red." The size of

pattern of evenly-spaced white flammules; protoconch large, mamillate; periostracum thin, translucent, smooth, with row of small tufts along shoulder carina

bristolensis) The small shell measures 23.5 mm. It is white under an olivaceous periostracum. The shell contains six rounded whorls and a very minute (decorticated)

regularly-spaced, amorphous brown flammules; early whorls pale orange; periostracum thick, with rows of erect hairs that correspond to raised, pustulated

with numerous, large, yellow-tan flammules; interior of aperture white; periostracum thin, yellow, transparent, smooth." The size of the shell varies between

ground-color is yellowish white covered with a thin smooth yellowish periostracum. The pattern of fluctuating longitudinal streaks of yellowish brown,

protoconch yellow, interior of aperture white; anterior tip of shell yellow; periostracum thin, yellow, transparent." The shell of a Conus Aureonimbosus can vary

core background is pink. As in other animals of this genus lacks the periostracum and operculum. The Harpa fulvomichaelensis Orga, 1998 has peculiar characteristics

chrysanthemum flower 菊花 キッカ jú huā 菊花 菊花 Chrysanthemum morifolium 1 Cicadae Periostracum cicada molting 蝉退 ゼンタイ chán tuì 蟬退 蝉退 Cryptotympana tustulata 1 Cimicifugae

description) The small, delicate shell is white with a pale yellowish periostracum. It contains at least six whorls beside the (lost) protoconch. The spire

rudis) The shell is of moderate size. It is white with a pale olivaceous periostracum. The smooth nucleus consists of about one whorl and five subsequent whorls

Malacostraca, ostracism, ostracize, ostracod, ostracoderm, ostracon, periostracum ostre- oyster Greek ὄστρεον ostreophagist, oyster ot- ear Greek οὖς,

apparently smaller than Sinonovacula constricta , while their wrinkles of periostracum and teeth of hinkles are also different.[citation needed] Hinge of Novaculina

the columella with the posterior angle of the aperture and renders the periostracum almost complete. The type specimen was found in the Pacific Ocean off

are lightly calcified, making them distinctively thin and brittle. The periostracum is a smooth, dark brown layer that extends past the shell edge. Unlike

marked. The whorl in front of it is abrupt, but not channelled. The periostracum pale yellowish, nearly transparent and polished. The sculpture consists

Malacostraca, ostracism, ostracize, ostracod, ostracoderm, ostracon, periostracum ostre- oyster Greek ὄστρεον ostreophagist, oyster ot- ear Greek οὖς,