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Ariunculus Isselii
''Ariunculus isselii'' is a species of terrestrial slug belonging to the family Arionidae. Previously it has been placed in the genus ''Arion'' or in its own genus ''Ichnusarion''; the latter is more often treated as a subgenus. The species is restricted to the island of Sardinia, but widespread there, from sea level to at least 1400 m. Its length crawling can approach 10 cm. Superficially it looks like other large slugs in the related genus ''Arion'', with the pneumostome in the front part of the mantle; its coloration is olive-grey with bright yellow pigment granules superimposed. Unlike species in the arionid genera ''Arion'' and'' Geomalacus ''Geomalacus'' is a genus of large air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the family Arionidae, the roundback slugs. Etymology The Ancient Greek word () means the Earth. The Greek word () means mollusc. Distr ...'', it does not use a spermatophore in its mating, which usually involves 12 h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mario Lessona
Mario Lessona (18 December 1855 in Genoa – 25 December 1911 in Turin) was an Italian zoologist and malacologist. He was the son of the prominent natural scientist and senator Michele Lessona and his wife Adele Masi Lessona, who was very much involved in her husband's work, particularly in making translations. A son of Adele Lessona by an earlier marriage was the painter and malacologist Carlo Pollonera, with whom Mario published a monograph on Italian slugs. Mario also coauthored various scientific works with his brother-in-law, the zoologist and senator Lorenzo Camerano. Biography In the 1880s, Lessona was an assistant professor of zoology at the University of Messina, and then a teacher of natural history at secondary schools in Venice and Carmagnola. In the 1890s he worked as a teacher in the Fornaris-Morocco boarding school in Turin. He published on malacology and comparative anatomy, as well as writing several books of natural history and geography for schools. He also ed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carlo Pollonera
Carlo Pollonera (Alexandria, Egypt, March 27, 1849 – Turin, June 17, 1923) was an Italian painter, particularly of landscapes, and also an important malacologist. Biography Carlo Pollonera's father, Giovanni B. Pollonera, was a lawyer in Alexandria. He died when Carlo was a child, after which his mother returned to Italy (Genoa) and remarried. As a seventeen-year-old, Carlo fought with Garibaldi on the Trentino campaign of 1866. In 1865, the family had moved to Turin, where Pollonera began studying painting with Alberto Maso Gilli. He enrolled at the Accademia Albertina and studied under Gamba and Andrea Gastaldi. Pollonera was a rebellious pupil, wanting to paint exactly what he saw, rather than, for instance, changing a distracting background. This principle not to improve on what he saw remained a hallmark of his painting throughout Pollonera's career. After four years with Gastaldi, in 1873 he switched to study in the private school of Antonio Fontanesi. In January 1875, h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slug
Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc. The word ''slug'' is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a small internal shell, particularly sea slugs and semislugs (this is in contrast to the common name '' snail'', which applies to gastropods that have a coiled shell large enough that they can fully retract their soft parts into it). Various taxonomic families of land slugs form part of several quite different evolutionary lineages, which also include snails. Thus, the various families of slugs are not closely related, despite a superficial similarity in the overall body form. The shell-less condition has arisen many times independently as an example of convergent evolution, and thus the category "slug" is polyphyletic. Taxonomy Of the six orders of Pulmonata, two – the Onchidiacea and Soleolifera – solely comprise slugs. A third fami ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arionidae
Arionidae, common name the "roundback slugs" or "round back slugs" are a taxonomic family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the superfamily Arionoidea. Distribution The distribution of this family of slugs includes Nearctic, Palearctic and Oriental regions."Family summary for Arionidae" , last change 12-06-2009, accessed 4 August 2010. Anatomy Unlike some slugs, European Arionidae have no on the back. The |
Arion (gastropod)
''Arion'' is a genus of air-breathing land slugs in the family Arionidae, the roundback slugs. Most species of this Palearctic genus are native to the Iberian Peninsula. Species can be difficult to distinguish from one another upon cursory examination, because individuals of a species can vary in color and there are few obvious differences between taxa. The color of an individual can be influenced by its diet.Jordaens, K., et al. (2001)Food-induced body pigmentation questions the taxonomic value of colour in the self-fertilizing slug ''Carinarion'' spp.''Journal of Molluscan Studies'' 67(2), 161-67. Some ''Arion'' are known as pests, such as ''A. lusitanicus'' auct. non Mabille (= ''A. vulgaris''), which damages agricultural crops and ornamental plants, and ''A. rufus'', a familiar garden pest. ''Arion'' slugs are often transported internationally in shipments of plant products and mushrooms. ''Arion'' slugs have been identified in North America and Australia as invasive species, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subgenus
In biology, a subgenus (plural: subgenera) is a taxonomic rank directly below genus. In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between the generic name and the specific epithet: e.g. the tiger cowry of the Indo-Pacific, ''Cypraea'' (''Cypraea'') ''tigris'' Linnaeus, which belongs to the subgenus ''Cypraea'' of the genus ''Cypraea''. However, it is not mandatory, or even customary, when giving the name of a species, to include the subgeneric name. In the International Code of Nomenclature for algae, fungi, and plants (ICNafp), the subgenus is one of the possible subdivisions of a genus. There is no limit to the number of divisions that are permitted within a genus by adding the prefix "sub-" or in other ways as long as no confusion can result. Article 4 The secondary ranks of section and series are subordinate to subgenus. An example is ''Banksia'' subg. ''Isostyl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pneumostome
The pneumostome or breathing pore is a respiratory opening of the external body anatomy of an air-breathing land slug or land snail. It is a part of the respiratory system of gastropods. It is an opening in the right side of the mantle of a stylommatophoran snail or slug. Air enters through the pneumostome into the animal's single lung, the air-filled mantle cavity. Inside the mantle cavity the animal has a highly vascularized area of tissue that functions as a lung. The pneumostome is often much easier to see in slugs than in snails, because of the absence of a shell which can often block the view of this area. In a land slug, when the pneumostome is wide open, it is usually very clearly visible on the right side of the animal. However, the position of the pneumostome is often not at all easy to discern when this orifice is completely closed. The pneumostome opens and closes in a cyclical manner. The frequency of pneumostome closing and opening is typically less than 0 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geomalacus
''Geomalacus'' is a genus of large air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the family Arionidae, the roundback slugs. Etymology The Ancient Greek word () means the Earth. The Greek word () means mollusc. Distribution Western Europe Species This genus contains the following species: subgenus '' Geomalacus'' * ''Geomalacus maculosus'' Allman, 1843 - Kerry slug subgenus '' Arrudia'' Pollonera, 1890 Pollonera C. (1890) ''Boll. Mus. Zool. Comp. Torino'', 5, no. 87, 36. * ''Geomalacus anguiformis'' (Morelet, 1845) * ''Geomalacus malagensis'' Wiktor & Norris, 1991 *::known by some as ''Geomalacus moreleti'' (Hesse, 1884) * ''Geomalacus oliveirae'' Simroth, 1891 Description Animal limaciform, subcylindrical, blunt behind, with a but little developed mucous pore; mantle anterior, close to the head, concealing a shell-plate; a distinct locomotive disk; respiratory orifice on the right anterior margin of the mantle; genital orifice behind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spermatophore
A spermatophore or sperm ampulla is a capsule or mass containing spermatozoa created by males of various animal species, especially salamanders and arthropods, and transferred in entirety to the female's ovipore during reproduction. Spermatophores may additionally contain nourishment for the female, in which case it is called a nuptial gift, as in the instance of bush crickets. In the case of the toxic moth '' Utetheisa ornatrix'', the spermatophore includes sperm, nutrients, and pyrrolizidine alkaloids which prevent predation because it is poisonous to most organisms. However, in some species such as the Edith's checkerspot butterfly, the "gift" provides little nutrient value. The weight of the spermatophore transferred at mating has little effect on female reproductive output. Arthropods Spermatophores are the norm in arachnids and several soil arthropods. In various insects, such as bush crickets, the spermatophore is often surrounded by a proteinaceous spermatophyl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autogamy
Autogamy, or self-fertilization, refers to the fusion of two gametes that come from one individual. Autogamy is predominantly observed in the form of self-pollination, a reproductive mechanism employed by many flowering plants. However, species of protists have also been observed using autogamy as a means of reproduction. Flowering plants engage in autogamy regularly, while the protists that engage in autogamy only do so in stressful environments. Occurrence Protists ''Paramecium aurelia'' '' Paramecium aurelia'' is the most commonly studied protozoan for autogamy. Similar to other unicellular organisms, ''Paramecium aurelia'' typically reproduce asexually via binary fission or sexually via cross-fertilization. However, studies have shown that when put under nutritional stress, ''Paramecium aurelia'' will undergo meiosis and subsequent fusion of gametic-like nuclei. This process, defined as hemixis, a chromosomal rearrangement process, takes place in a number of steps. First, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
