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Physical geography Reference Libraries

Page 8 of about 100 Articles
Xestospongia testudinaria
2014-01-05 00:00:00

Xestospongia testudinaria is a species of barrel sponge in the Petrosiidae family. It is found in the Philippines, Australia, western and central Indian Ocean, Indonesia, Malaya, and New Caledonia. This species ranges in size from 3.9 to 7.9 inches in length and 3.9 to 7.9 inches in diameter in intertidal zones. It is maroon to pink, with the opening of the barrel pale white. Specimens are...

Idaho Ground Squirrel Urocitellus brunneus
2012-04-23 06:30:00

The Idaho ground squirrel (Urocitellus brunneus), also called the Idaho Spotted ground squirrel, is one of the largest of the ground squirrel breed. It has two subspecies, both located in Idaho. Both the northern and southern Idaho ground squirrels have a sexual diphorism, where the males are usually larger than the females. This ground squirrel species generally weighs between .3 pounds and .4...

Siderastreidae
2012-04-03 19:03:15

Siderastreidae is a family of colonial, reef building stony corals. Members of this family include symbiotic algae in their tissues which help provide their energy requirements. The World Register of Marine Species lists 7 genera within this family: Anomastraea, Coscinaraea, Craterastrea, Horastrea, Psammocora, Pseudosiderastrea, and Siderastrea. Corals in this family vary in form and...

Horn Corals
2012-04-03 18:06:52

Horn corals, known as Rugosa or Tetracoralla, are an extinct order of coral that were abundant during the Middle Ordovician to Late Permian stages. They were known as horn corals because of a unique horn-shaped chamber with a wrinkled (rugose) wall. These mostly solitary corals often reached lengths of nearly 40 inches. However, some species could form large colonies. Rugose corals...

Tabulata
2012-04-03 17:00:56

Tabulata is a family of extinct tabulate corals. These corals lived entirely during the Paleozoic era, being found from the Ordovician to the Permian stages. There are about 300 known genera of tabulate corals, of which Aulopora, Favosites, Halysites, Heliolites, Pleurodictyum, Sarcinula and Syringopora are the most common in the fossil record. These corals were mostly found in the shallow...

Frogspawn
2012-04-03 14:56:39

Frogspawn, (Euphyllia divisa), is a species of stony coral native to the Indo-Pacific islands. The related coral E. paradivisa is sometimes misidentified as frogspawn leading to some confusion. E. divisa has a corallite skeleton with a flabello-meandroid (continuous skeletal) “wall” structure, whereas E. paradivisa has a tree-like branching structure with separate corallites. Frogspawn...

Plate Coral
2012-04-03 14:30:21

Plate Coral, (Fungia paumotensis), is a species of stony coral that occurs in the Indian Ocean on upper reef slopes especially where there is considerable movement of the water from wave action. It is usually found on sand or beds of coral fragments. This solitary, non-colonial coral is free living and not attached to the seabed. It is elongated and oval in shape and can grow rather large....

Astrocoeniidae
2012-04-03 14:18:34

Astrocoeniidae is a family of stony corals endemic to the waters around Papua New Guinea and northern Australia. Their habitats are steep slopes where strong currents rise from below, in crevices and below overhangs. These are reef-building colonial corals containing an algae known as zooxanthallae. These algae typically encrust corals up to 20 inches in diameter. On reef slopes, where...

Alcyoniidae
2012-04-03 14:15:16

Alcyoniidae is a family of leathery corals that occur globally in temperate and tropical seas. These reef dwellers are often found in wave-exposed areas of reef crests, less turbid waters in lagoons, on steep slopes, under overhangs, and at depths of 100 feet and deeper. A colony of leathery coral is stiff, hard, and inflexible. It is composed of tiny polyps projecting from a shared...

Saichania
2010-09-16 16:42:25

Saichania, meaning "beautiful one", is a genus of ankylosaurid dinosaur from the Late Cretaceous Period. It was discovered in the Barun Goyot Formation in the Nemegt Basin, southern Mongolia. The type species is S. chulsanensis. Saichania was described in 1977 by Teresa Maryańska. They type specimen consists of a skull and the anterior part of the postcranial skeleton, including neck...

Word of the Day
call-note
  • The call or cry of a bird or other animal to its mate or its young.
'Call-note' is newer than 'bird-call,' which originally referred to 'an instrument for imitating the note of birds' but now also refers to 'the song or cry of a bird.'
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