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Calcinus Laevimanus
''Calcinus laevimanus'' is a species of hermit crab in the genus ''Calcinus'' found in the Indo-West Pacific region, the type locality being Hawaii. It is also known as the blue-eyed hermit crab, zebra hermit crab, dwarf zebra hermit crab, left-handed hermit crab, Hawaiian reef hermit and other similar names. Description The anterior part of this crab is calcified while the posterior part, protected by the shell it inhabits, is not. The total length is up to with a shield length of up to , with males usually being larger than females. The eyestalks are long and slender, and inflated at the base. The left cheliped (claw) is much larger than the right one. The propodus (penultimate joint) is smooth and shiny, the finger and thumb having spoon-shaped, calcified tips. The general colour of the carapace is brown to grey. The eye stalks are blue at the base and orange distally. The first pair of antennae have blue bases and orange tips and the second pair are entirely orange. The ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Witt Randall
John Witt Randall (November 6, 1813 – January 25, 1892) was a minor poet and, for a brief time, a naturalist, but is best known for the collection of drawings and engravings that he bequeathed to Harvard University. Early life Randall was born in Boston, the son of Dr. John Randall (1774–1843), and his wife, Elizabeth Wells Randall (1783–1868). Dr. Randall was an eminent physician and dentist, with three degrees from Harvard College (A.B. 1802, M.B. 1806, M.D. 1811), and Elizabeth Randall was a granddaughter of the American Founding Father Samuel Adams. After they married in 1809, John and Elizabeth Randall lived at 5 Winter Street, a wood-framed house with a garden on the southeast corner of Winter Street at Winter Place (the home, from 1784 until his death in 1803, of Samuel Adams and, until her death in 1808, of his widow Elizabeth Adams). Around 1830, Adams' old house was replaced by Dr. Randall's new one, and the address changed to 20 Winter Street. The family lived t ... [...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] |
Calcinus
''Calcinus'' is a genus of hermit crabs in the family Diogenidae The Diogenidae are a family of hermit crabs, sometimes known as "left-handed hermit crabs" because in contrast to most other hermit crabs, its left chela (claw) is enlarged instead of the right. It comprises 429 extant species, and a further 4 ..., containing the following species: *'' Calcinus albengai'' Poupin & Lemaitre, 2003 *'' Calcinus anani'' Poupin & McLaughlin, 1998 *'' Calcinus argus'' Wooster, 1984 *'' Calcinus californiensis'' Bouvier, 1898 *'' Calcinus chilensis'' (H. Milne Edwards, 1836) *'' Calcinus dapsiles'' Mogan, 1989 *'' Calcinus elegans'' (H. Milne-Edwards, 1836) *'' Calcinus explorator'' Boone, 1930 *'' Calcinus gaimardii'' (H. Milne-Edwards, 1848) *'' Calcinus gouti'' Poupin, 1997 *'' Calcinus guamensis'' Wooster, 1984 *'' Calcinus haigae'' Wooster, 1984 *'' Calcinus hakahau'' Poupin & McLaughlin, 1998 *'' Calcinus hazletti'' Haig & McLaughlin, 1984 *'' Calcinus imperialis'' Whitelegge, 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indo-Pacific
The Indo-Pacific is a vast biogeographic region of Earth. In a narrow sense, sometimes known as the Indo-West Pacific or Indo-Pacific Asia, it comprises the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the seas connecting the two in the general area of Indonesia. It does not include the temperate and polar regions of the Indian and Pacific oceans, nor the Tropical Eastern Pacific, along the Pacific coast of the Americas, which is also a distinct marine realm. The term is especially useful in marine biology, ichthyology, and similar fields, since many marine habitats are continuously connected from Madagascar to Japan and Oceania, and a number of species occur over that range, but are not found in the Atlantic Ocean. The region has an exceptionally high species richness, with the world's highest species richness being found in at its heart in the Coral Triangle, and a remarkable gradient of decreasing species richness radiating outward in al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chela (organ)
A chela ()also called a claw, nipper, or pinceris a pincer (biology), pincer-like organ at the end of certain limbs of some arthropods. The name comes from Ancient Greek , through New Latin '. The plural form is chelae. Legs bearing a chela are called chelipeds. Another name is ''claw'' because most chelae are curved and have a sharp point like a claw. Chelae can be present at the tips of arthropod legs as well as their pedipalps. Chelae are distinct from spider chelicerae in that they do not contain venomous glands and cannot distribute venom. See also * Pincer (biology) * Pincer (tool) References Arthropod anatomy {{Arthropod-anatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carapace
A carapace is a Dorsum (biology), dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the underside is called the plastron. Crustaceans In crustaceans, the carapace functions as a protective cover over the cephalothorax (i.e., the fused head and thorax, as distinct from the abdomen behind). Where it projects forward beyond the eyes, this projection is called a rostrum (anatomy), rostrum. The carapace is Calcification, calcified to varying degrees in different crustaceans. Zooplankton within the phylum Crustacea also have a carapace. These include Cladocera, ostracods, and Isopoda, isopods, but isopods only have a developed "cephalic shield" carapace covering the head. Arachnids In arachnids, the carapace is formed by the fusion of prosomal tergites into a single Plate (animal anatomy), plate which carries the e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbo (gastropod)
''Turbo'' is a genus of large sea snails with gills and an operculum, marine gastropod molluscs in the family Turbinidae, the turban snails.Bouchet, P.; Rosenberg, G. (2012). Turbo Linnaeus, 1758. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=151576 on 2012-09-27 ''Turbo'' is the type genus of the family. Description The shells of species in this genus are more or less highly conspiral, thick, about 20–200 mm, first whorls bicarinate, last whorl large often with strong spiral sculpture, knobs or spines, base convex, with or without umbilicus. Species in this genus have a round aperture and a solid, dome-shaped calcareous operculum. This circular operculum commences as a multispiral disc, like that of a ''Trochus'', upon the outer side of which is deposited a thin calcareous layer by a lobe of the foot which projects partly over it. This arrangement produces an operculum which exhibits all the whorls beneat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nerita
''Nerita'' is a genus of medium-sized to small sea snails with a gill and an operculum, marine gastropod molluscs in the subfamily Neritinae of the family Neritidae, the nerites.MolluscaBase eds. (2021). MolluscaBase. Nerita Linnaeus, 1758. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=138254 on 2021-09-20 This is the type genus of the family Neritidae. Distribution and habitat Species of ''Nerita'' can be found worldwide in tropical waters in the middle and upper intertidal zones. They are gregarious herbivores. Description The thick shell is broadly ovate or globular and low-spired. It has a smooth surface. The shells are spirally ribbed or show some axial sculpturing. The ventral side has a large columellar callus or parietal wall. The callus shows small pustules. The aperture and the edge of the columella are usually dentate with fine or robust teeth. The calcareus operculum is thick and can be smooth or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochus Intextus
''Trochus intextus'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.Rosenberg, G. (2014). Trochus intextus Kiener, 1850. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=742894 on 2014-06-16 Description The size of the shell varies between 20 mm and 30 mm. The thick, solid shell has a rather straightly conical shape and is falsely umbilicate. The outlines of the nearly rectilinear spire are nearly straight with an acute apex. The shell contains about eight whorls. The body whorl is obtusely angulated at the periphery. The sutures are scarcely impressed. The color of the upper surface grayish or corneous white, broadly longitudinally striped with red or purplish, the red sometimes covering the whole surface, sometimes reduced to small maculations or narrow lines. The base of the shell contains narrow zigzag radiating red stripes. The sculpture of the upper surfa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbo Sandwicensis
''Turbo sandwicensis'', common name the Hawaiian top shell, is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.Bouchet, P. (2012). ''Turbo sandwicensis'' (Pease, 1861). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581914 on 2012-09-01 Description The length of the shell varies between 15 mm and 45 mm. The shell is ovately turbinated, slightly perforated, somewhat tubulous and spirally ridged. The ridges are smooth alternately rather smaller, squamose. The scales are most prominent on the body whorl. The interstices between the ridges are finely imbricately laminated. The body whorl is somewhat angulated at the upper part. The color pattern of the shell is green, marbled and variegated with dark brownish red. Distribution This species occurs in the Pacific Ocean off Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, locat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunella Coronata
''Lunella coronata'', common name the crowned turban shell or the coronate moon turban, is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails. Description The shell grows to a length of 4 cm, with conspicuous flattened, cup-like scales interspersed by small, regular rows of nodules. The colour of the shell is pale to greenish, flecked with purplish-brown markings (often encrusted with light pink coralline algae). The operculum is smooth to faintly granular with pale green centre. (Richmond, 1997). The solid, imperforate shell has a depressed-turbinate shape with a diameter greater than the altitude. It is covered with an irregular spiral series of nodules and granules, of which the subsutural series and two on the median portion of the body whorl are more prominent. The spire is depressed, dome-shaped with an apex that is frequently eroded and red. The shell contains 4 to 5 whorls, the last very large. The large aperture is round ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Larva
A larva (; plural larvae ) is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle. The larva's appearance is generally very different from the adult form (''e.g.'' caterpillars and butterflies) including different unique structures and organs that do not occur in the adult form. Their diet may also be considerably different. Larvae are frequently adapted to different environments than adults. For example, some larvae such as tadpoles live almost exclusively in aquatic environments, but can live outside water as adult frogs. By living in a distinct environment, larvae may be given shelter from predators and reduce competition for resources with the adult population. Animals in the larval stage will consume food to fuel their transition into the adult form. In some organisms like polychaetes and barnacles, adults are immobil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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