Asteroidea

Asteroidea
Top left: Klaus Rassinger (Museum Wiesbaden) Top right: Katie Ahlfeld Bottom rig · CC BY-SA 4.0 · source
Name	Asteroidea
Regnum	Animalia
Phylum	Echinodermata
Class	Asteroidea
Subdivision ranks	Orders

Asteroidea Asteroidea are a class of echinoderms known for radial symmetry and usually five or more arms radiating from a central disc. They are widely studied by institutions such as Smithsonian Institution, Natural History Museum, London, Scripps Institution of Oceanography, Monterey Bay Aquarium Research Institute, and researchers affiliated with University of Cambridge, Harvard University, University of Oxford, Yale University, and Stanford University. Specimens appear in collections at the American Museum of Natural History, Royal Ontario Museum, Australian Museum, and field programs like those at Bermuda Institute of Ocean Sciences.

Taxonomy and Evolution

Modern classification places these animals within the phylum Echinodermata and the subphylum Eleutherozoa. Paleontological work in formations such as the Burgess Shale and the Chengjiang biota informs understanding of early echinoderm lineages studied by paleontologists at the Field Museum and Natural History Museum, London. Molecular phylogenetics using data from the National Center for Biotechnology Information and projects led by labs at University of California, Berkeley, University of Tokyo, Max Planck Society, and Smithsonian Institution have resolved orders including the Forcipulatida, Valvatida, Spinulosida, and Paxillosida. Evolutionary hypotheses reference fossil taxa described in journals such as Nature, Science, Paleobiology, and publications from the Geological Society of America. Comparative studies involve researchers from University of Washington, Woods Hole Oceanographic Institution, University of Queensland, and museums including the Natural History Museum, Paris.

Morphology and Anatomy

Body plans exhibit a central disc and radiating arms with a calcareous endoskeleton composed of ossicles analogous to structures examined by anatomists at Johns Hopkins University and University of Chicago. External features include tube feet operated by a water vascular system first characterized by work associated with Marine Biological Laboratory, Scripps Institution of Oceanography, and historical collections at the Royal Society. Skeletal variations and pedicellariae are compared across taxa in monographs produced by Zoological Society of London and researchers from University of Copenhagen, University of Oslo, and University of Auckland. Sensory structures and nervous systems are topics in collaborations involving Max Planck Institute for Brain Research and laboratories at Cold Spring Harbor Laboratory.

Physiology and Behavior

Feeding strategies range from predation to scavenging and suspension feeding; notable ecological interactions have been documented by researchers from Smithsonian Tropical Research Institute, Woods Hole Oceanographic Institution, Monterey Bay Aquarium Research Institute, and the Australian Institute of Marine Science. Physiological processes such as regeneration and autotomy are subjects of studies at Harvard Medical School, Massachusetts Institute of Technology, and the Max Planck Society. Locomotion using tube feet and ambulacral grooves is compared in field studies conducted near Monterey Bay, Great Barrier Reef, Galápagos Islands, and the Red Sea by teams from University of Hawaii, James Cook University, and University of British Columbia.

Ecology and Distribution

Species inhabit benthic zones from intertidal regions to abyssal plains mapped by expeditions from vessels like RV Atlantis, RV Polarstern, RV Calypso, and agencies including NOAA, British Antarctic Survey, and National Oceanic and Atmospheric Administration. Biogeographic patterns are analyzed using data shared with institutions including Global Biodiversity Information Facility and Ocean Biogeographic Information System and involve regions such as the Arctic Ocean, Southern Ocean, Mediterranean Sea, and Caribbean Sea. Community dynamics involving kelp forests at Channel Islands National Park, coral reefs at Great Barrier Reef Marine Park Authority, and seamounts explored by NOAA Ship Okeanos Explorer highlight interactions with taxa investigated by California Academy of Sciences and the Woods Hole Oceanographic Institution.

Reproduction and Life Cycle

Reproductive modes include broadcast spawning, brooding, and fissiparity; developmental stages from lecithotrophic larvae to planktotrophic bipinnaria and brachiolaria have been described in work from Marine Biological Laboratory, Woods Hole Oceanographic Institution, Scripps Institution of Oceanography, and laboratories at University of California, Santa Cruz. Larval dispersal models are integrated into conservation planning by organizations such as IUCN and research groups at University of Exeter and James Cook University. Studies of genetic connectivity and population structure use methods developed at European Molecular Biology Laboratory and facilities at Cold Spring Harbor Laboratory.

Interactions with Humans

Human interactions include fisheries bycatch recorded by agencies like National Oceanic and Atmospheric Administration, aquarium exhibits curated by Monterey Bay Aquarium and Sea Life London Aquarium, and cultural references in art collections at the British Museum and Metropolitan Museum of Art. Aquaculture research and restoration initiatives involve partnerships with NOAA Fisheries, Australian Institute of Marine Science, University of California, Davis, and conservation NGOs such as World Wildlife Fund. Historical naturalists including collectors associated with the British Museum and explorers tied to voyages of the HMS Challenger contributed to early specimen records housed at the Natural History Museum, London.

Conservation and Threats

Threats from climate change, ocean acidification, habitat loss, and invasive species are monitored by programs at IUCN, Intergovernmental Panel on Climate Change, UN Environment Programme, and regional bodies like European Environment Agency. Conservation measures and marine protected areas are managed by organizations such as NOAA', Great Barrier Reef Marine Park Authority, UNESCO World Heritage Centre, and national agencies including Department of Environment, Food and Rural Affairs and Department of Conservation (New Zealand). Research into resilience and restoration is ongoing at institutions including University of Miami, Duke University Marine Laboratory, University of Cape Town, and National Oceanography Centre.

Category:Echinoderms