Quantcast
Last updated on April 16, 2014 at 6:35 EDT

Latest Echinoderm Stories

2011-02-16 15:38:44

Scientists reorganise the animal phylogenetic tree An international team of scientists including Albert Poustka from the Max Planck Institute for Molecular Genetics in Berlin has discovered that Xenoturbellida and the acoelomorph worms, both simple marine worms, are more closely related to complex organisms like humans and sea urchins than was previously assumed. As a result they have made a major revision to the phylogenetic history of animals. Up to now, the acoelomate worms were viewed as...

2011-02-09 23:48:09

Two groups of lowly marine worms are related to complex species including vertebrates (such as humans) and starfish, according to new research. Previously thought to be an evolutionary link between simple animals such as jellyfish and the rest of animal life - the worms' surprising promotion implies that they have not always been as simple as they now appear. Although the marine worms Xenoturbella and Acoelomorpha are very simple animals "“ they lack a developed nervous system or gut...

a4eaeda0123dff7c4356d5f88b21fb851
2010-01-08 13:22:59

The impact on levels of carbon dioxide in the Earth's atmosphere by the decaying remains of a group of marine creatures that includes starfish and sea urchin has been significantly underestimated. "Climate models must take this carbon sink into account," says Mario Lebrato, lead author of the study. The work was done when he was at the National Oceanography Centre, Southampton (NOCS) and affiliated with the University of Southampton's School of Ocean and Earth Science (SOES); he is now at the...

2008-10-02 03:00:25

By Alvarado, Juan Jose Abstract: Between October 2003 and July 2005, aggregation behavior of the sea urchin Astropyga pulvinta Lamarck was studied in Bahia Culebra, Costa Rica. This sea urchin forms aggregations during part of the year and then disappears. I quantified the number of individuals present in a defined area each month, their aggregation behavior between day and night, and their size. Also, temperature and nutrient concentrations of the water were sampled. There were...

2007-07-03 09:17:00

By Crawford, Terry J Crawford, Bruce J Abstract: In Rarotonga, Linckia multifora (Lamarck) exists in two forms: a blue gray type that is found on the reef intertidally and a red form that is found subtidally. Both types reproduce asexually by regeneration of autotomized arms, as well as sexually, but the relative potential for sexual reproduction varies greatly between these different sites. In the laboratory, reciprocal crosses of the blue gray intertidal form and the red subtidal form...

12d9679040db8fec11074924d933adfe1
2006-11-06 15:26:43

Genetic analysis of an obscure, worm-like creature retrieved from the depths of the North Atlantic has led to the discovery of a new phylum, a rare event in an era when most organisms have already been grouped into major evolutionary categories. The analysis also appears to shed light on the ancestor of chordates, the backboned animals that include human beings and two small invertebrate groups closely related to one another: lancelets and tunicates. Its a tremendous surprise that this...


Latest Echinoderm Reference Libraries

Eccentric Sand Dollar, Dendraster excentricus
2013-11-21 12:20:48

The Eccentric Sand Dollar (Dendraster excentricus) known also as the Sea-Cake, Biscuit-Urchin, Western Sand Dollar, or the Pacific Sand Dollar, is a member of the order Clypeasteroida, better known as sand dollars, a species of flattened, burrowing sea urchins located along the Pacific Ocean from Alaska to Baja California. This species is an irregular echinoid that is flattened and burrows into the sand, unlike the regular echinoids, or sea urchins. It can be found living within the...

Echinus tylodes
2013-11-15 10:51:41

Echinus tylodes is a species of sea urchin belonging to the Echinidae family. It’s white with rather sparse pink colored spines and is native to the eastern coast of North America including the Gulf of Mexico. This species has a sub-globular test that is about two-thirds as high as it is wide and grows to a diameter of 4 inches. The joints that are between the ambulacral plates and the pores through which the tube feet project are both sunken below the general surface of the test. The...

Edible Sea Cucumber, Holothuria edulis
2013-11-01 10:54:43

The Edible Sea Cucumber (Holothuria edulis) also known as the Pink and Black Sea Cucumber, is a species of echinoderm belonging to the family Holothuriidae. It was placed in the subgenus Halodeima by Pearson in the year 1914, making its full scientific name Holothuria (Halodeima) Edulis. It can be found in shallow water within the temperate and tropical western portion of the Indo-Pacific Ocean. This species is of medium size and can grow to a length of about 12 inches. It has a roughly...

Blue Spiny Starfish, Coscinasterias tenuispina
2013-08-11 13:40:45

The blue spiny starfish (Coscinasterias tenuispina), also known as the white starfish, is a species that is classified within the Asteriidae family. It can be found in the Mediterranean Sea and the Atlantic Ocean. Its range includes the coasts of Portugal, France, Cuba, Brazil, various islands in the Atlantic, and the coasts from North Carolina to Santos. It prefers a habitat along shorelines at depths of up to 160 feet. This species holds more female members than males. The blue spiny...

Mediterranean feather star, Antedon mediterranea
2013-05-18 06:26:42

The Mediterranean feather star is a filter feeder that obtains food by straining suspended matter and food particles from water. The star has a stalk that has up to forty tendrils, (threadlike organs) which help the star cling to hard surfaces. The “body” of the star is called a calyx and is shaped like a small cup. This calyx is surrounded by feathery pinnules bearing arms. These arms are quite unique in the fact that they can regenerate if one should get broken off; these arms extend to...

More Articles (7 articles) »