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Daphnella Pagodiformis
''Daphnella'' is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae. Not to be confused with ''Daphnella'' Baird, 1850, a synonym of ''Diaphanosoma'' Fischer, 1850 belonging to the Sididae, a family of ctenopods. Description This genus is well characterised by a small, thin shell, elongate-ovate form, a sharp outer lip, the position of the sinus on the line of the advancing suture, and by the reduction of the siphonal canal. The protoconch has a sinusigerid (or diagonally cancellate) structure. The surface is usually striated. The spire is elevated, the body whorl is elongated. The early whorls of the teleoconch show a nodulous sculpture produced by strong axial riblets and strong spiral lirations. These axial riblets disappear on the body whorl, while the spiral lirations remain. The aperture is oblong-oval, slightly channelled in front. The columella is simple. The outer lip is slightly thickened in the adult. Species Species within the genus ''Daphn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod Shell
The gastropod shell is part of the body of many gastropods, including snails, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or in some cases the shell is reduced such that the body cannot be retracted within it (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the Aperture (mollusc), aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. Shell layers The gastropod shell has three major layers secreted by the Mantle (mollusc), mantle. The calcareous central layer, ostracum, is typically made of calcium carbonate (CaCO3) precipitated into an organic matrix ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columella (gastropod)
The columella (meaning "little column") or (in older texts) pillar is a central anatomical feature of a coiled snail shell, a gastropod shell. The columella is often only clearly visible as a structure when the shell is broken, sliced in half vertically, or viewed as an X-ray image. The columella runs from the apex of the shell to the midpoint of the undersurface of the shell, or the tip of the siphonal canal in those shells which have a siphonal canal. If a snail shell is visualized as a cone of shelly material which is wrapped around a central axis, then the columella more or less coincides spatially with the central axis of the shell. In the case of shells that have an umbilicus (mollusc), umbilicus, the columella is a hollow structure. The columella of some groups of gastropod shells can have a number of plications or folds (the columellar fold, plaits or plicae), which are usually visible when looking to the inner lip into the Aperture (mollusc), aperture of the shell. These ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnella Bartschi
''Daphnella bartschi'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of the shell attains 10 mm, its diameter 5 mm. (Original description) The small, slender shell is yellowish white with brown flames and flecks. The whorls are moderately convex. The suture is distinct. The shell contains six whorls, with a very minute brown protoconch of two whorls. The whole surface is delicately reticulated with subequal axial and spiral threads, the spirals cut by the axial interspaces into minute nodules, the interstices squarish. The surface resulting is grating to the touch. The aperture is narrow. The siphonal canal is hardly differentiated and not recurved. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnella Axis
''Daphnella axis'', common name the axle pleuratoma, is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description (Original description) The shell is straightly acuminate and contracted at the upper part. The whorls show two keels round the upper part. They are transversely faintly ridged beneath. The aperture is oblong. The sinus, which is formed between the two keels, is unusually deep. The color of the shell is whitish, somewhat indistinctly stained with orange-brown.Reeve, L.A. 1846. ''Monograph of the genus Pleurotoma''. pls 34–40 in Reeve, L.A. (ed). Conchologia Iconica. London : L. Reeve & Co. Vol. 1. Distribution This marine species occurs off the Philippines, in the Gulf of Oman and in the Gulf of Carpentaria - Queensland, Australia References * Brazier, J. 1876. ''A list of the Pleurotomidae collected during the Chevert expedition, with the description of the new species.'' Proceedings of the Linnean Society of New South Wales 1: 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnella Aureola
''Daphnella aureola'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of the shell varies between 9 mm and 22 mm. The thin, transparent shell is spirally ridged, longitudinally very finely closely striated. The outer lip is crenulated within The small sinus is distinct. The shell has a pale golden color. Distribution This marine species occurs off the |
Daphnella Aulacoessa
''Daphnella aulacoessa'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The high, narrow, white shell has a fusiform shape. The whorls are convexly cylindrical. The spire is high, narrow, subscalar, and conical. The body whorl is long, narrow, and conical, with a small snout. The outer lip has a thin crimped edge. The sinus is small, but very well defined at the extreme top of the long narrow aperture. Sculpture: Longitudinals—there are on each whorl many (27 on penultimate, about 40 on the body whorl) fine, rounded, curved threads, which correspond with the old lines of growth. They are parted by minute furrows, which are rather narrower than the threads. These longitudinals extend to the base, but not to the snout. Spirals—the riblets are crossed by very similar spiral threads which form minute knots at the crossings, and these are parted by little furrows which are rather wider and less regular than the longitudinal ones, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnella Atractoides
''Daphnella atractoides'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of the shell varies between 5.5 mm and 10 mm. Distribution This marine species occurs off Taiwan, New Caledonia and the Fiji Islands Fiji, officially the Republic of Fiji, is an island country in Melanesia, part of Oceania in the South Pacific Ocean. It lies about north-northeast of New Zealand. Fiji consists of an archipelago of more than 330 islands—of which about .... References * Hervier, J., 1898 ''Description d'espèces nouvelles de mollusques, provenant de l'archipel de la Nouvelle-Calédonie (suite)'' Journal de Conchyliologie, 45"1897" 165-192 * Fischer-Piette, E., 1950. ''Liste des types décrits dans le Journal de Conchyliologie et conservés dans la collection de ce journal (avec planches)(suite).'' Journal de Conchyliologie 90: 149-180 * Severns, M. (2011). ''Shells of the Hawaiian Islands - The Sea Shells.'' C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnella Aspersa
''Daphnella aspersa'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Original Description Original description of Clathurella aspersa (Gould, 1860). Descriptions of new shells collected by the United States North Pacific Exploring Expedition. Proceedings of the Boston Society of Natural History. 7: 323-336 eptember 1860 337-340 ctober 1860 382-384 ecember 1860, available onlin This marine species occurs off Hong Kong Hong Kong)., Legally Hong Kong, China in international treaties and organizations. is a special administrative region of China. With 7.5 million residents in a territory, Hong Kong is the fourth most densely populated region in the wor .... References External links * Johnson R.I. (1964) - The recent Mollusca of Augustus Addison Gould; Bulletin - United States National Museum vol. 239, 1964 aspersa Gastropods described in 1860 {{Daphnella-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnella Areolata
''Daphnella areolata'' is a species of sea snail, a marine gastropod mollusc in the family Raphitomidae. Description The length of the shell varies between 9 mm and 12 mm. Distribution This marine species occurs off Aliguay Island, Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ... References Bibliography * Stahlschmidt P., Poppe G.T. & Chino M. (2014) Description of seven new Daphnella species from the Philippines (Gastropoda: Raphitomidae). Visaya 4(2): 29-38. ay 2014page(s): 31. External links Gastropods.com: ''Daphnella areolata'' {{Taxonbar, from=Q56280172 areolata Gastropods described in 2014 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnella Arcta
''Daphnella arcta'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description This is a narrow cytharoid species, evidently a near ally of the protean '' Paraclathurella gracilenta'', Reeve, 1843. The granulately cancellate third whorl hints at identity with this, and also the form of the aperture and outer lip. But the mature shell is more abbreviate and considerably smaller. As E.A. Smith points out, there is much variation in the colour; some specimens are white, others reddish, and we have examples from Hong Kong of a dark greenish brown. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnella Arafurensis
''Daphnella arafurensis'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of the shell attains 15 mm, its diameter 4⅓ mm. (Original description) The fusiform shell is whitish, faintly banded with light brown. It is spirally ridged and striated and marked with the flexuous lines of growth. This species is peculiar on account of the absence of longitudinal ribs. The shell contains 7 whorls. The two whorls in the protoconch are globose, microscopically reticulated, but appearing smooth under an ordinary lens, rather large. The subsequent five are convex, a little constricted beneath the suture, and spirally ridged and striated. The upper whorls have four or five principal lirae, the uppermost falling just beneath the slight constriction, and the others below at equal distances. The whorls are thickened at or immediately under the sutural line with an elevated ridge, and between this and the first lira and in the interstices ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnella Anteniana
''Daphnella'' is a genus of sea snails, marine gastropod mollusks in the family (biology), family Raphitomidae. Not to be confused with ''Daphnella'' Baird, 1850, a synonym of ''Diaphanosoma'' Fischer, 1850 belonging to the Sididae, a family of ctenopods. Description This genus is well characterised by a small, thin shell, elongate-ovate form, a sharp outer Lip (gastropod), lip, the position of the sinus on the line of the advancing suture, and by the reduction of the siphonal canal. The protoconch has a sinusigerid (or diagonally cancellate) structure. The surface is usually striated. The Spire (mollusc), spire is elevated, the body whorl is elongated. The early whorls of the teleoconch show a nodulous sculpture produced by strong axial riblets and strong spiral lirations. These axial riblets disappear on the body whorl, while the spiral lirations remain. The Aperture (mollusc), aperture is oblong-oval, slightly channelled in front. The Columella (gastropod), columella is simpl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
