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Lygromma Anops
''Lygromma anops'' is one of only three known eyeless spiders in the superfamily Gnaphosoidea, and one of only two known troglobites (cave species). It is found in lava caves on Isla Santa Cruz, Galápagos. It is possible that ''L. anops'', like many inhabitants of lava caves, colonizes new caves through interconnecting cracks and crevices, and that these small spaces are in reality its main habitat. Males reach a body length of about 3.4 mm. ''L. anops'' seems to be closely related with '' L. senoculatum'', '' L. valencianum'' and '' L. huberti'' from Venezuela. ''Lygromma gertschi'', a blind, cave-inhabiting species from Jamaica Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of Hispan ... is not a close relative of ''L. anops''. References * Peck, S.B. & Shear, W.A. (1987). A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gnaphosoidea
The Gnaphosoidea or gnaphosoids are a superfamily of araneomorph spiders with seven families. A 2014 study did not find the group to be monophyletic. Phylogeny Gnaphosoidea has been circumscribed to contain the following families: * Ammoxenidae * Cithaeronidae * Gallieniellidae * Gnaphosidae * Lamponidae * Trochanteriidae Gnaphosoidea has been placed in the Dionycha clade, itself part of the RTA clade: The Prodidomidae, Lamponidae and Gnaphosidae have been considered "higher gnaphosoids", sharing anterior lateral spinnerets consisting of only a single "joint" (article); the "lower gnaphosoids" (Ammoxenidae, Cithaeronidae, Gallieniellidae and Trochanteriidae) retain a distal article that is represented by an entire ring of hardened (sclerotized) cuticle. (Earlier the Lamponidae were grouped with the "lower gnaphosoids", having spinnerets of an intermediate kind.) One hypothesis for the internal phylogeny of the gnaphosoids, defined in this way, is: A 2014 study of dionychan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Troglobite
A troglobite (or, formally, troglobiont) is an animal species, or population of a species, strictly bound to underground habitats, such as caves. These are separate from species that mainly live in above-ground habitats but are also able to live underground (eutroglophiles), and species that are only cave visitors (subtroglophiles and trogloxenes). Land-dwelling troglobites may be referred to as troglofauna, while aquatic species may be called stygofauna, although for these animals the term ''stygobite'' is preferable. Troglobites typically have evolutionary adaptations to cave life. Examples of such adaptations include slow metabolism, reduced energy consumption, better food usage efficiency, decrease or loss of eyesight (anophthalmia), and depigmentation (absence of pigment in the integument). Conversely, as opposed to lost or reduced functions, many species have evolved elongated antenna and locomotory appendages, in order to better move around and respond to environment ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lava
Lava is molten or partially molten rock ( magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from . The volcanic rock resulting from subsequent cooling is also often called ''lava''. A lava flow is an outpouring of lava during an effusive eruption. (An explosive eruption, by contrast, produces a mixture of volcanic ash and other fragments called tephra, not lava flows.) The viscosity of most lava is about that of ketchup, roughly 10,000 to 100,000 times that of water. Even so, lava can flow great distances before cooling causes it to solidify, because lava exposed to air quickly develops a solid crust that insulates the remaining liquid lava, helping to keep it hot and inviscid enough to continue flowing. The word ''lava'' comes from Italian and is probably derived from the Latin word ''l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santa Cruz Island (Galápagos)
Santa Cruz Island () is one of the Galápagos Islands with an area of and a maximum altitude of . Situated in the center of the archipelago, Santa Cruz is the second largest island after Isabela. Its capital is Puerto Ayora, the most populated urban centre in the islands. On Santa Cruz, there are some small villages, whose inhabitants work in agriculture and cattle raising. The island is an oval-shaped, long and wide shield volcano. Its summit contains a shallow caldera that has been largely buried by youthful pit craters and cinder cones with well-preserved craters. The most recent eruptions may have occurred only a few thousand years ago with the effusion of sparsely vegetated lava flows from vents on the north flank and along the summit fissure. A gigantic lava tube measuring over long is a tourist attraction on the island. As a testimony to its volcanic history there are two big holes formed by the collapse of a magma chamber: Los Gemelos, or "The Twins". Named aft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lygromma Senoculatum
''Lygromma'' is a spider genus of Central and South America. There are species with eight, six (e.g. ''L. senoculatum'', ''L. valencianum'') and no eyes. The eyeless ''L. anops'' is endemic to Galapagos, while the not closely related blind ''L. gertschi'' is found only on Jamaica. The Mexican genus '' Tivodrassus'', and '' Tricongius'' have been suggested as sister groups of ''Lygromma''. Species reach a body length from about 2 to 4.6 mm. Species it contains 19 species: * '' Lygromma anops'' Peck & Shear, 1987 — Galapagos Islands * '' Lygromma chamberlini'' Gertsch, 1941 — Panama, Colombia, Cuba * ''Lygromma domingo'' Platnick & Shadab, 1981 — Ecuador * ''Lygromma dybasi'' Platnick & Shadab, 1976 — Costa Rica, Panama * ''Lygromma gasnieri'' Brescovit & Höfer, 1993 — Brazil * ''Lygromma gertschi'' Platnick & Shadab, 1976 — Jamaica * ''Lygromma huberti'' Platnick & Shadab, 1976 — Venezuela, Brazil * ''Lygromma kochalkai'' Platnick & Shadab, 1976 — Colombia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Venezuela
Venezuela (; ), officially the Bolivarian Republic of Venezuela ( es, link=no, República Bolivariana de Venezuela), is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in the Caribbean Sea. It has a territorial extension of , and its population was estimated at 29 million in 2022. The capital and largest urban agglomeration is the city of Caracas. The continental territory is bordered on the north by the Caribbean Sea and the Atlantic Ocean, on the west by Colombia, Brazil on the south, Trinidad and Tobago to the north-east and on the east by Guyana. The Venezuelan government maintains a claim against Guyana to Guayana Esequiba. Venezuela is a federal presidential republic consisting of 23 states, the Capital District and federal dependencies covering Venezuela's offshore islands. Venezuela is among the most urbanized countries in Latin America; the vast majority of Venezuelans live in the cities of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lygromma Gertschi
''Lygromma'' is a spider genus of Central and South America. There are species with eight, six (e.g. ''L. senoculatum'', ''L. valencianum'') and no eyes. The eyeless ''L. anops'' is endemic to Galapagos, while the not closely related blind ''L. gertschi'' is found only on Jamaica. The Mexican genus '' Tivodrassus'', and '' Tricongius'' have been suggested as sister groups of ''Lygromma''. Species reach a body length from about 2 to 4.6 mm. Species it contains 19 species: * '' Lygromma anops'' Peck & Shear, 1987 — Galapagos Islands * '' Lygromma chamberlini'' Gertsch, 1941 — Panama, Colombia, Cuba * '' Lygromma domingo'' Platnick & Shadab, 1981 — Ecuador * ''Lygromma dybasi'' Platnick & Shadab, 1976 — Costa Rica, Panama * '' Lygromma gasnieri'' Brescovit & Höfer, 1993 — Brazil * '' Lygromma gertschi'' Platnick & Shadab, 1976 — Jamaica * ''Lygromma huberti'' Platnick & Shadab, 1976 — Venezuela, Brazil * ''Lygromma kochalkai'' Platnick & Shadab, 1976 — Colom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jamaica
Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of Hispaniola (the island containing the countries of Haiti and the Dominican Republic); the British Overseas Territory of the Cayman Islands lies some to the north-west. Originally inhabited by the indigenous Taíno peoples, the island came under Spanish rule following the arrival of Christopher Columbus in 1494. Many of the indigenous people either were killed or died of diseases, after which the Spanish brought large numbers of African slaves to Jamaica as labourers. The island remained a possession of Spain until 1655, when England (later Great Britain) conquered it, renaming it ''Jamaica''. Under British colonial rule Jamaica became a leading sugar exporter, with a plantation economy dependent on the African slaves and later their descenda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prodidominae
Prodidominae is a family of spider, sometimes called long-spinneret ground spiders. It was formerly regarded as a subfamily of Gnaphosidae, but was raised to a family in 2022. Spiders in the family are easily identified by the greatly elongated base of the piriform gland spigots. At least parts of their body are covered with shiny scales or setae. The posterior median eyes are flat and silvery, with a triangular, egg-shaped or irregularly rectangular shape.Barbara BaehrProdidomidae/ref> Biology Spiders in the Prodidominae are ground dwellers. Most species are nocturnal and hide during the day in litter, but ''Myandra'' species, which are probably mimicking ants, seem to be active during the day. The genus ''Zimiris'' is synanthropic and thus found throughout the tropics. Distribution Although ''Theuma walteri'' was described from Turkmenistan by Eugène Simon, it is suspected that Simon accidentally exchanged its locality with that of ''Anagraphis pallens'' (Gnaphosidae); the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
