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Anatoma Eximia
''Anatoma eximia'' is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Anatomidae. Description (Original description in Italian) This beautiful species is larger than ''Anatoma crispata'' (Fleming, 1828), and it differs from it in many characteristics. The anterior region of the body whorl is much more convex and elegantly reticulated by radial ribs and by girdles (cingula) equal to them, both of which are extremely slender and very closely spaced in the previous species. The umbilicus is reduced to a simple umbilical fissure, whereas in ''A. crispata'', the surrounding region gradually sinks to form an enlarged umbilicus. The slit on the keel extends for more than a quarter of the body whorl; the rim is encircled by two slightly projecting lamellae, which are, however, very prominent in ''A. crispata'' and ''Anatoma aspera'' (Philippi, 1844). The posterior region of the whorls is flattened-convex, while in the other species, it is strongly c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giuseppe Seguenza
Giuseppe Seguenza (June 8, 1833 in Messina – February 3, 1889 in Messina) was an Italian naturalist and geologist. Early life Giuseppe Seguenza was born on June 8, 1833, in Italy. Because his father expected him to follow in his footsteps and become a pharmacist, Seguenza studied under his father, who also owned his own pharmacy. Later, Seguenza chose to study the geological and mineralogical sciences. Scientific research At the age of 23, Giuseppe Seguenza discovered that all the products of the emanations of Vulcano (one of the Aeolian Islands) contained arsenic compounds. Afterward, he published other scientific works that earned him the attention of scholars in Europe and the silver medal at the Paris Exposition. He was appointed Professor of Natural History at the Maurolico School, then the Technical Institute of Messina, and finally earned a professorship at the University of Messina. There followed other work around the metalliferous deposits of Fiumedinisi, land ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology (biology), morphology, behaviour, or ecological niche. In addition, palaeontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species (except viruses) are given a binomial nomenclature, two-part name, a "binomen". The first part of a binomen is the name of a genus to which the species belongs. The second part is called the specific name (zoology), specific name or the specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Snail
Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible Gastropod shell, 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 Neritidae, 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 (gastropod), Truncatella'') are sometimes considered to be sea snails and sometimes listed as land snails. Anatomy Sea snails are a very large and diverse group of animals. 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 w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine (ocean)
The ocean is the body of salt water that covers approximately 70.8% of Earth. The ocean is conventionally divided into large bodies of water, which are also referred to as ''oceans'' (the Pacific, Atlantic, Indian, Antarctic/Southern, and Arctic Ocean),"Ocean." ''Merriam-Webster.com Dictionary'', Merriam-Webster, https://www.merriam-webster.com/dictionary/ocean . Accessed March 14, 2021. and are themselves mostly divided into seas, gulfs and subsequent bodies of water. The ocean contains 97% of [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod
Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and from the land. There are many thousands of species of sea snails and sea slug, slugs, as well as freshwater snails, freshwater limpets, land snails and slugs. The class Gastropoda is a diverse and highly successful class of mollusks within the phylum Mollusca. It contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Furongian, Late Cambrian. , 721 family (taxonomy), families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently neontology, extant living fossil, with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusk
Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The number of additional fossil species is estimated between 60,000 and 100,000, and the proportion of undescribed species is very high. Many taxa remain poorly studied. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat, as numerous groups are freshwater and even terrestrial species. The phylum is typically divided into 7 or 8 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known extant i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micromollusk
A micromollusc is a shelled mollusc which is extremely small, even at full adult size. The word is usually, but not exclusively, applied to marine molluscs, although in addition, numerous species of land snails and freshwater molluscs also reach adult size at very small dimensions. These tiny molluscs or their tiny shells are easy to overlook, as many of them are not very noticeable to the naked eye, and thus many people are not aware that they even exist. Nonetheless there are large numbers of families and vast numbers of mollusc species, in particular marine gastropods or sea snails, which are minute enough to be considered micromolluscs. Considerable numbers of marine gastropod species are only about 5 or 6 mm in adult size; many others are only about 2 or 3 mm in adult size; and a few have adult shells which are as small as one millimeter or even smaller still. Micromolluscs are known to have adult shells as small as 600 μm.Geiger et al 2007, Pg. 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family (, : ) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". The delineation of what constitutes a family—or whether a described family should be acknowledged—is established and decided upon by active taxonomists. There are not strict regulations for outlining or acknowledging a family, yet in the realm of plants, these classifications often rely on both the vegetative and reproductive characteristics of plant species. Taxonomists frequently hold varying perspectives on these descriptions, leading to a lack of widespread consensus within the scientific community ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anatomidae
Anatomidae is a family of small sea snails, marine gastropod mollusks in the clade Vetigastropoda Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouch ... (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). Anatomidae was raised to the rank of subfamily to the rank of family in a study by Geiger & Jansen (2004). Bouchet & Rocroi placed it in the superfamily Scissurelloidea. This was disputed in 2008 by Yasunori Kano who does not believe that Anatomidae should be separated from Scissurellidae and actually states that it is the subfamily Anatominae. He suggests that this result was induced by contamination or mislabelling. This family has no subfamilies. Genera Genera within the family Anatomidae include: * '' Anatoma'' Woodward, 1859 * '' Sasakiconcha'' Geiger, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anatoma Crispata
''Anatoma crispata'' is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family (biology), family Anatomidae. Description The length of the shell varies between 1 mm and 4 mm. The globose, pearly white shell slopes toward the periphery. It is delicate, semitransparent, and glossy. The Sculpture (mollusc), sculpture consists of numerous fine, curved, longitudinal ribs, interrupted by the slit fasciole, closer on the base, intersected by minute spiral striae in the interstices. The thin epidermis is caducous, and pale yellowish-brown. The Spire (mollusc), spire is usually rather depressed, but variable. The four ; Whorl (mollusc), whorls are flattened above, rapidly enlarging. The slit is long and narrow, nearly central. The slit fasciole is deep, striated across. The edges are somewhat thick, sharp, and prominent . The rounded Aperture (mollusc), aperture is oblique. The Peristome (gastropod), peristome is continuous. The outer Lip (gastro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Body Whorl
The body whorl is part of the morphology (biology), morphology of the gastropod shell, 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 body whorl, or last whorl, is the most recently formed and largest Whorl (mollusc), whorl (or revolution) of a spiral or Helix, helical Gastropod shell, shell, terminating in the Aperture (mollusc), aperture. It is called the "body whorl" because most of the body of the soft parts of the animal fits into this whorl. The proportional size of the body whorl in gastropod shells differs greatly according to the actual shell morphology. For shells in which the rate of whorl expansion of each revolution around the axis is very high, the aperture and the body whorl are large, and the shell tends to be low Spire (mollusc), spired. The shell of the abalone is a good example of this kind of shell. The opposite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anatoma Aspera
''Anatoma aspera'' is a species of small sea snail, a marine gastropod mollusc or micromollusc in the family Anatomidae Anatomidae is a family of small sea snails, marine gastropod mollusks in the clade Vetigastropoda Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetig .... Description The length of the shell of this species varies between 1 mm and 3 mm. The shell is usually grayish-white. Operculum is thin and transparent. Distribution This species occurs in European waters, the Mediterranean Sea, the northern Atlantic Ocean, and in the West Indies. References * Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). ''European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification''. Collection Patrimoines Naturels, 50: pp. 180–213 * Geiger D.L. (201 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
