|
Acinodrillia
''Acinodrillia'' is a genus of sea snails, marine gastropod mollusks in the family Drilliidae. Description The length of the claviform shell varies between 7mm and 12 mm. The spiral sculpture of the shell shows sharply incised grooves, carving through the axial ribs into distinct nodules or granules. These axial ribs disappear below the suture. Contrary to the species in '' Drillia'', the anal sinus is not spout-like. Contrary to ''Agladrillia'', the outer lip is not pinched in toward the base of the shell. The body whorl shows a dorsal varix (a subcylíndrical protrusion). The wide siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ... is unnotched. Distribution This marine genus is endemic to South Africa. Species Species within the genus ''Acinodrillia'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acinodrillia
''Acinodrillia'' is a genus of sea snails, marine gastropod mollusks in the family Drilliidae. Description The length of the claviform shell varies between 7mm and 12 mm. The spiral sculpture of the shell shows sharply incised grooves, carving through the axial ribs into distinct nodules or granules. These axial ribs disappear below the suture. Contrary to the species in '' Drillia'', the anal sinus is not spout-like. Contrary to ''Agladrillia'', the outer lip is not pinched in toward the base of the shell. The body whorl shows a dorsal varix (a subcylíndrical protrusion). The wide siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ... is unnotched. Distribution This marine genus is endemic to South Africa. Species Species within the genus ''Acinodrillia'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acinodrillia Viscum
''Acinodrillia viscum'' is a species of sea snail, a marine gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ... mollusk in the family Drilliidae. Description The length of the white, claviform shell varies between 7.2 mm and 8.9 mm; its width is 3.1 mm. The spiral sculpture of the shell shows sharply incised grooves, carving through the strong, raised axial ribs into distinct, coarse nodules. Distribution This marine species occurs along East Transkei, South Africa. References External links BioLib: ''Acinodrillia viscum'' Endemic fauna of South Africa viscum Gastropods described in 1988 {{drilliidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acinodrillia Paula
''Acinodrillia paula'' is a species of sea snail, a marine gastropod mollusk in the family Drilliidae. Description The length of the claviform shell attains 11.8 mm, its width 4.2 mm. It shows the general characteristics of the genus, but is especially characterized by the axial grooves that are cut on the body whorl The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk. In gastropods In gastropods, the b ... by spiral grooves, forming a lozenge-shaped pattern. Distribution This marine species occurs in the Agulhas Bank, South Africa References * J. Thiele (1925) Gastropoden der Deutschen Tiefsee-Expedition. In:. Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition II. Teil, vol. 17, No. 2, Gutstav Fischer, Berlin. External links BioLib: ''Acinodrillia paula'' Endemic fauna of South Africa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acinodrillia Amazimba
''Acinodrillia amazimba'' is a species of sea snail, a marine gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ... mollusk in the family Drilliidae. Description The length of the brown, biconic-claviform shell varies between 8.8 mm and 9.5 mm; its width is 3.7 mm. The spiral sculpture of the shell shows sharply incised grooves, carving through the fine, raised axial ribs into small nodules. Distribution This marine species occurs off West Transkei, South Africa. References External links Biolib: ''Acinodrillia amazimba'' Endemic fauna of South Africa amazimba Gastropods described in 1988 {{drilliidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drilliidae
The Drilliidae are a Taxonomy (biology), taxonomic family (biology), family of small predatory sea snails with high-spired shells. They are classified as marine (ocean), marine gastropod mollusks in the superfamily Conoidea. This family has no subfamilies. It consists of about 30 genera and approximately 500 Recent species. Description The shell is claviform with a tall spire, or squatly conical to biconical. In many species, the siphonal canal is truncated. The aperture (mollusc), aperture is U-shaped with a parietal callus pad. The sculpture of the shell shows prominent axial ribs with a polished surface. Most species have a dorsal varix (mollusc), varix (transverse elevation), except in the genera ''Cymatosyrinx'', ''Elaeocyma'' and ''Splendrillia''. The protoconch can be smooth or very carinate. The ovate operculum (gastropod), operculum has a terminal nucleus. The radula of the species in this family have characteristically five teeth in each row (formula : 1 + 1 + 1 + 1 + ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lip (gastropod)
In the shell of gastropod mollusks (a snail shell), the lip is the free margin of the peristome (synonym: peritreme) or aperture (the opening) of the gastropod shell. In dextral (right-handed) shells (most snail shells are right-handed), the right side or outer side of the aperture is known as the outer lip (''labrum''). The left side of the aperture is known as the inner lip or columellar lip (''labium'') if there is a pronounced lip there. In those species where there is no pronounced lip, the part of the body whorl that adjoins the aperture is known as the parietal wall. The outer lip is usually thin and sharp in immature shells, and in some adults (e.g. the land snails ''Helicella'' and '' Bulimulus''). However, in some other land snails and in many marine species the outer lip is ''thickened'' (also called ''callused''), or ''reflected'' (turned outwards). In some other marine species it is curled inwards (''inflected''), as in the cowries such as ''Cypraea''. It can also be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is found exclusively in southwestern South Africa and is therefore said to be ''endemic'' to that particular part of the world. An endemic species can be also be referred to as an ''endemism'' or in scientific literature as an ''endemite''. For example '' Cytisus aeolicus'' is an endemite of the Italian flora. '' Adzharia renschi'' was once believed to be an endemite of the Caucasus, but it was later discovered to be a non-indigenous species from South America belonging to a different genus. The extreme opposite of an endemic species is one with a cosmopolitan distribution, having a global or widespread range. A rare alternative term for a species that is endemic is "precinctive", which applies to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siphonal Canal
The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is drawn into the mantle cavity and over the gill and which serves as a chemoreceptor to locate food. Siphonal canals allow for active transport of water to sensory organs inside the shell. Organisms without siphonal canals in their shells rely on passive or diffuse transport or water into their shell. Those with siphonal canals have a direct inhalant stream of water that interacts with sensory organs to detect concentration and direction of a stimulus, such as food or mates. In certain groups of carnivorous snails, where the siphon is particularly long, the structure of the shell has been modified in order to house and protect the soft structure of the siphon. Thus the siphonal canal is a semi-tubular extension of the aperture of the shell th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Varix (mollusc)
A varix () is an anatomical feature of the shell of certain sea snails, marine gastropod molluscs. Gastropods whose shells have varices are primarily families and species within the taxonomic groups Littorinimorpha and Neogastropoda. The varix is a thickened axial ridge, a subcylindrical protrusion, in the shell which exists in some families of marine gastropods. It is an important shell character in generic classification. A varix is located at intervals around the whorl, and is formed by considerable thickening of the outer lip during a resting stage in the growth of the shell. In other words, in gastropods whose shells have varices, the shells are characterised by episodic growth - the shell grows in spurts, and during the resting phase the varix forms. In many gastropod whose shells have varices, for example the Cassinae, the varix is essentially merely a thickening and swelling of the shell at that point. But in some genera within the family Muricidae, such as ''Chicoreu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agladrillia
''Agladrillia'' is a genus of sea snails, marine gastropod mollusks in the family Drilliidae The Drilliidae are a Taxonomy (biology), taxonomic family (biology), family of small predatory sea snails with high-spired shells. They are classified as marine (ocean), marine gastropod mollusks in the superfamily Conoidea. This family has no s .... Description A specific characteristic for this genus is that the outer lip is strongly drawn in towards the base. Species Species within the genus ''Agladrillia'' include: * '' Agladrillia anadelgado'' Rolán et al., 2007 * '' Agladrillia aureola'' Fallon, 2016 * '' Agladrillia badia'' McLean & Poorman, 1971 * '' Agladrillia benjamini'' (Bartsch, 1915) * † '' Agladrillia callothyra'' Woodring, 1928 * '' Agladrillia flucticulus'' McLean & Poorman, 1971 * '' Agladrillia fuegiensis'' (Smith E. A., 1888) * '' Agladrillia gorgonensis'' McLean & Poorman, 1971 * '' Agladrillia macella'' (Melvill, 1923) * '' Agladrillia nitens'' (Hinds, 184 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible shell. Definition Determining whether some gastropods should be called sea snails is not always easy. Some species that live in brackish water (such as certain neritids) can be listed as either freshwater snails or marine snails, and some species that live at or just above the high tide level (for example species in the genus '' Truncatella'') are sometimes considered to be sea snails and sometimes listed as land snails. Anatomy Sea snails are a very large group of animals and a very diverse one. Most snails that live in salt water respire using a gill or gills; a few species, though, have a lung, are intertidal, and are active only at low tide when they can move around in the air. These air-breathing species includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Endemic")
.jpg "Click for more on -> Siphonal Canal")
.jpg "Click for more on -> Sea Snail")