The suture is distinct, not marginate. The aperture is lunate. The anal sulcus is very wide and shallow. The outer lip is thin, arcuately protractivc.
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The spire consists of three whorls, the first ? (abrupt), the second a little convex, somewhat planulate above and radiately arcuately plicate. The body whorl is large, having a thin double carina (slit fasciole) a little above the middle, radiately arcuately plicate above the carina, below it with stride of growth. The large aperture is irregularly circular, and very slightly expanded at the basal margi.
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The outer lip is thin, sharp and arcuately produced. The inner lip is erased. The columella is short. The siphonal canal is very short but distinct.
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The anal sulcus is rounded, wide and shallow. The outer lip is thin, sharp and arcuately produced. The aperture is narrowly ovate. The inner lip is erased.
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The base of the shell is evenly rounded. The aperture is ample. The anal sulcus at the suture is wide and deep. The thin outer lip is arcuately produced.
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The anal sulcus is wide and deep. The outer lip is thin, sharp and prominently arcuately produced. The inner lip is erased. The short columella is attenuated in front and gyrate.
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The anal sulcus is shallow, slightly removed from the suture. The fasciole is lightly impressed on the body whorl. The aperture is narrow. The outer lip is thin, sharp and arcuately produced.
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The aperture is small. The anal sulcus is deep, with a subsutural callus. The outer lip is thin, sharp and arcuately produced. The inner lip and columella show a thin layer of enamel.
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The surface is otherwise smooth except for faint incremental lines. The aperture is lunate. The anal sulcus is wide and shallow. The outer lip is sharp, thin and arcuately produced in front of the sulcus.
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The anal sulcus is wide and rounded with a slightly flaring edge. The outer lip is thin, sharp and prominently arcuately produced. The inner lip is erased. The columella is strong and attenuated in front.
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The aperture is rather narrow. The anal sulcus is wide and deep, its deepest part at the shoulder, with no subsutural callus. The outer lip is thin, sharp and prominently arcuately produced. The inner lip is erased.
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The lip in front of it is thin, sharp, and strongly arcuately protractive. The body is smooth. The columella is very short, smooth, obliquely truncate. The siphonal canal is very short, deep, recurved, forming a marked siphonal fasciole.
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The peripheral keel on the spire is nearer the succeeding than the preceding suture. The aperture is elongate. The outer lip is thin and smooth within and arcuately produced in front of the fasciole. The inner lip is erased.
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The aperture is narrow. The anal sulcus is deep and wide, reaching the suture The outer lip is thin, sharp, and arcuately produced. The inner lip is slightly eroded, polished, with no callus. There is plication at the proximal end of the columella.
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The smooth protoconch is bluntly rounded and paucispiral, consisting of two whorls. The sinus is subsutural, steeply descending and then produced forward to meet the arcuately produced outer lip. The vestigial operculum may reflect an archaic condition.A.W. Powell, Antarctic and Subantarctic Mollusca.
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The thin outer lip is arcuately produced. The aperture is oblong and ovate.G.B. Sowerby III (1914), New Mollusca from the genus Pleurotoma (Surcula), Oliva and Limopsis from Japan; The Annals and Magazine of Natural History: Including Zoology, Botany, and Geology. ser. 8, vol.
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The columella is deeply arcuate. The umbilical region is covered by an opaque, white, arcuately striated callus. Its outer edge is well defined.H.A. Pilsbry (1890) Manual of Conchology XII; Academy of Natural Sciences, Philadelphia, 1890 (described as Stomatella papyracea) The animal, according to A. Adams,A.
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The sculpture is erased. The outer lip is thin, simple, with a wide sulcus occupying the space between the suture and the shoulder, in front of which it is arcuately protractive. The columella is straight, simple and obliquely truncate in front. The siphonal canal is short, wide and not recurved.
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They are most prominent on the anterior half of the whorls of the spire and on the periphery of the body whorl. The aperture is narrow. The anal sulcus is deep and rounded, with a prominent subsutural callus. The outer lip is sharp-edged, with a moderate varix behind it, and is arcuately produced.
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28-32 (Description by Dall) The larval shell is multispiral. The adult shell shows a small blunt protoconch of several (usually) swollen whorls, closely arcuately axially ribbed. This protoconch is dark and sculptured with criss-cross lines, strongly contrasting with the rest of the shell. The succeeding short-fusiform whorls have an axial and (fainter) spiral sculpture.
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The length of the shell attains 8.4 mm, its diameter 3.6 mm. The minute shell has a pale buff color with a brown Sinusigera protoconch of three whorls and four subsequent well rounded whorls. The suture is appressed with a fine thread in front of it;.0 The anal sulcus is wide and shallow, leaving a wide fasciole, arcuately striated behind it.
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Above the keels they are finely arcuately striate, below irregularly more or less crenately concentrically ridged . The aperture is triangularly subquadrate, pure white, and shining within. The white columella is smooth, slightly arcuate above, nearly straight below. The outer lip shows a broad excavated sinus extending from its juncture with the body whorl to the extremity of the last keel.
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The axial sculpture consists of (on the penultimate whorl 11, on the body whorl 9) promment, slightly shouldered ribs with wider interspaces. The ribs undulate the appressed suture. The spiral sculpture consists of close-set alternated threads over the whole surface except between the shoulder and the suture, which is arcuately striated by the incremental lines. The aperture is narrow and straight.
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The suture is distinct, not appressed, with a feebly indicated flattish area between it and the posterior edge of the anal fasciole, which between the keel and the flattening is slightly impressed. There is no other spiral sculpture and the axial sculpture consists mostly of moderately prominent incremental lines. The anal sulcus is deep and wide. The outer lip is thin, prominently arcuately produced.
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The spiral sculpture shows on the second normal whorl 3, on the next 4, and on the body whorl 10 slender threads with wider interspaces, overrunning the ribs and in front of these finer close-set threads on the columella. The aperture is hardly wider than the siphonal canal. The thin outer lip is arcuately produced in front. The columella is very short and attenuated in front.
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The succession of undulations or slightly swollen segments gives a slightly cancellate effect to the part of the whorl which bears them, but there are no axial ribs, the effect being produced rather by depressions between the rather coarse incremental lines. The aperture is narrow and acute behind. The anal sulcus is narrow and distinct but not very deep. The outer lip in front of it is arcuately produced.
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The anal fasciole is close to the suture slightly depressed, spirally threaded, arcuately striated. The spiral sculpture on the early whorls consists of a peripheral keel with one strong thread behind it. The rest of the surface is finely closely spirally threaded. The last three or four whorls are peripherally waved with narrower interspaces over which the keel and thread are a little swollen, the fine threading continuing.
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The suture is closely appressed with a cord-like edge behind the strongly constricted, arcuately striated anal fasciole. The spiral sculpture consists of (on the penultimate whorl about seven) flattish, close-set cords. In some specimens these alternate in size, in others they are nearly equal. On the body whorl there are about 25, some irregularly larger than the others, and a few smaller threads on the siphonal canal .
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The axial sculpture consists of more or less distinct incremental lines, and on the upper spire of about 15 very oblique anteriorly protracted riblets chiefly visible at the shoulder and obsolete on or entirely absent from the last two whorls. The anal sulcus is wide, deep, rounded, the fasciole slightly impressed. The outer lip is thin, sharp and arcuately produce The inner lip is erased. The columella is short, white, obliquely attenuated in front.
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Potentilla erecta is a low, clump-forming plant with slender, procumbent to arcuately upright stalks, growing tall and with non-rooting runners. It grows wild predominantly in Europe and western Asia, mostly on acid soils and in a wide variety of habitats such as mountains, heaths, meadows, sandy soils and dunes. This plant flowers from May to August/September. There is one yellow, wide flower, growing at the tip of a long stalk.
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It contains two whorls, the second sharply keeled and passing gradually into the sculpture of the subsequent 8½ whorls. The suture is strongly appressed behind the concave arcuately striated anal fasciole. The axial sculpture shows (on the body whorl 10) prominent protractive ribs extending from the fasciole to the succeeding suture on the spire and somewhat over the periphery on the body whorl. These ribs are knob-like and prominent on the periphery and rapidly diminish forward.
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The suture is strongly appressed with a strong cord in front of it. The anal fasciole is excavated, arcuately striated, with a few obscure fine spiral threads running in it. The axial sculpture consists of (on the body whorl fifteen) short prominent nearly vertical subrectangular ribs rounded above and confined to the peripheral region in front of which on the base of the body whorl are about twice as many thread-like ridges mostly continuous over the base to the beginning of the siphonal canal. The incremental lines are rather marked.
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The last whorl is neither calloused nor contracted preceding the aperture. The aperture is about ¼ the length of shell, arcuately convex, somewhat impressed on the outer side, the impression running as a groove-like depression for a short distance on the last whorl. Aperture is toothed, the teeth are reddish, very weak and placed deep in the throat: 1 tooth on the middle of the parietal wall, 1 on the columella, 2 very weakly developed, frequently wanting, on the palatal wall. Peristome is continuous, somewhat expanded, little thickened.
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The length of the shell attains 7 mm; its width 2 mm.. (Original description) The shell has a shortly fusiform shape and is light brown. It contains 6 ½ whorls. The nucleus consists of 1½ rather large, globose, glassy shining whorls. The four whorls following are strongly keeled around the middle, concave above, with two or three fine spiral lirae, and also concave below the carina, margined at the upper and lower boundaries by a fine thread-like lira arcuately or flexuously elevately striated above the carina, and obliquely but in an opposite direction, beneath it.
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The suture is distinct, not appressed, with a broad anal fasciole in front of it, arcuately sculptured by lunate wrinkles following the lines of growth and in the earlier whorls elevated into sharp wrinkles at regular intervals, which are carried more or less distinctly over the anterior part of the whorls. In front of the somewhat concave fasciole the whorls are rounded and spirally sculptured with numerous close, very fine, sharp, spiral threads which cover the whorl, becoming coarser, less regular, and less crowded toward the siphonal canal. The aperture is short and lunate. The outer lip shows a broad, deep, rounded anal sulcus close to the suture.
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