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Porcellanopagurus Foresti
''Porcellanopagurus'' is a genus of hermit crabs. The genus occurs in the Pacific and Indian Oceans. Description ''Porcellanopagurus'' is unusual among hermit crabs in that the body is largely symmetrical, with the abdomen held recurved above the cephalothorax. L. A. Borradaile interpreted ''Porcellanopagurus'' as being an independent instance of carcinisation among the Anomura Anomura (sometimes Anomala) is a group of Decapoda, decapod crustaceans, including hermit crabs and others. Although the names of many anomurans include the word ''crab'', all true crabs are in the sister group to the Anomura, the Brachyura (the .... Species ''Porcellanopagurus'' contains the following species: References Further reading * {{Taxonbar, from=Q3933518 Hermit crabs Taxa named by Henri Filhol Decapod genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henri Filhol
Henri Filhol Henri Filhol (13 May 1843 – 28 April 1902) was a French medical doctor, malacologist and naturalist born in Toulouse. He was the son of Édouard Filhol (1814-1883), curator of the Muséum de Toulouse. After receiving his early education in Toulouse, he moved to Paris, where he obtained doctorates in medicine and science. In 1879 he was appointed professor of zoology at the Faculty of Toulouse. From 1894 to 1902 he occupied the chair of comparative animal anatomy at the ''Muséum national d'Histoire naturelle'' in Paris. In 1897 he became a member of the ''Académie des sciences''. In the field of paleontology, he performed important studies of fossilized mammals in the phosphorites in Quercy.Henri Filhol (1843-1902)- Gloubik Sciences. He served as the expedition doctor and naturalist on the French 1874 Transit of Venus Expedition to Campbell Island, with Filhol Peak on the island being named after him.Tee, Garry JScience on the Map: Places in New Zealand Named A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porcellanopagurus Edwardsi
''Porcellanopagurus edwardsi'' is a species of hermit crab that lives in the waters around New Zealand and its subantarctic islands. Distribution ''Porcellanopagurus edwardsi'' is found around the Auckland Islands, Campbell Islands, Snares Islands, Stewart Island and along the coast of New Zealand's South Island. The closely related species '' P. filholi'' has a more northerly distribution, overlapping with that of ''P. edwardsi'' only in the region of the Banks Peninsula. pp. 110–114''P. edwardsi'' pp. 114–117''P. filholi'' Taxonomy ''Porcellanopagurus edwardsi'' was described by Henri Filhol in 1885 as the only species in a new genus '' Porcellanopagurus''; 12 further species have since been described. Description Unlike most hermit crabs, ''Porcellanopagurus edwardsi'' is almost symmetrical, but its abdomen is bent back over the carapace, so that the pleopods are dorsally situated. The abdomen is "grossly distorted", and is usually covered by the shell of a biv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermit Crab
Hermit crabs are anomuran decapod crustaceans of the superfamily Paguroidea that have adapted to occupy empty scavenged mollusc shells to protect their fragile exoskeletons. There are over 800 species of hermit crab, most of which possess an asymmetric abdomen concealed by a snug-fitting shell. Hermit crabs' soft (non-calcified) abdominal exoskeleton means they must occupy shelter produced by other organisms or risk being defenseless. The strong association between hermit crabs and their shelters has significantly influenced their biology. Almost 800 species carry mobile shelters (most often calcified snail shells); this protective mobility contributes to the diversity and multitude of crustaceans found in almost all marine environments. In most species, development involves metamorphosis from symmetric, free-swimming larvae to morphologically asymmetric, benthic-dwelling, shell-seeking crabs. Such physiological and behavioral extremes facilitate a transition to a sheltered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Symmetry
Symmetry (from grc, συμμετρία "agreement in dimensions, due proportion, arrangement") in everyday language refers to a sense of harmonious and beautiful proportion and balance. In mathematics, "symmetry" has a more precise definition, and is usually used to refer to an object that is invariant under some transformations; including translation, reflection, rotation or scaling. Although these two meanings of "symmetry" can sometimes be told apart, they are intricately related, and hence are discussed together in this article. Mathematical symmetry may be observed with respect to the passage of time; as a spatial relationship; through geometric transformations; through other kinds of functional transformations; and as an aspect of abstract objects, including theoretic models, language, and music. This article describes symmetry from three perspectives: in mathematics, including geometry, the most familiar type of symmetry for many people; in science and nature ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalothorax
The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. (The terms ''prosoma'' and ''opisthosoma'' are equivalent to ''cephalothorax'' and ''abdomen'' in some groups.) The word ''cephalothorax'' is derived from the Greek words for head (, ') and thorax (, '). This fusion of the head and thorax is seen in chelicerates and crustaceans; in other groups, such as the Hexapoda (including insects), the head remains free of the thorax. In horseshoe crabs and many crustaceans, a hard shell called the carapace covers the cephalothorax. Arachnid anatomy Fovea The fovea is the centre of the cephalothorax and is located behind the head (only in spiders).Dalton, Steve (2008). ''Spiders; The Ultimate Predators''. A & C Black, London. P.p. 19. . It is often important in identification. It can be transverse or procurved Smith, A. M. (1990c). Baboon spiders: Tarantulas of Afri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lancelot Alexander Borradaile
Lancelot Alexander Borradaile (1872 – 20 October 1945) was an English zoologist, noted for his work on crustaceans and his books ''The Invertebrata'' and ''Manual of Elementary Zoology''. Legacy Borradaile may be best known for his undergraduate textbook titled ''Manual of Elementary Zoology'', and for ''The Invertebrata: a manual for the use of students'', co-written with F. A. Potts. As well as these generalist works, Borradaile also worked as a carcinologist. He published an important monograph ''On the Pontoniinae'' in 1917, based on material collected by the 1905 Percy Sladen Trust Expedition to the Indian Ocean, led by John Stanley Gardiner. He worked extensively on crabs and similar animals, and coined the term "carcinisation" to describe "one of the many attempts of Nature to evolve a crab". He is commemorated in the scientific names '' Metapenaeopsis borradaili'', '' Athanas borradailei'', '' Corallianassa borradailei'', '' Accalathura borradailei'' and '' Petrolisth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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