Knowledge (XXG)

California sea hare

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larvae eat enough to double their weight every 10 days for the following 3 months while they undergo metamorphosis. Reproductive maturity is reached 85 days after hatching (133 days after deposition of the fertilized eggs). The development of the nervous system lasts for 140 days. Often, the California sea hare dies shortly after laying eggs. Cooler temperatures (14-25°C, or 57-77°F) delay spawning and have been shown to extend the lifespan.
364: 477: 524:. Chemical deterrence involves the release of toxic chemicals that are noxious to predators and rapidly dissuades them from feeding. Ink creates a dark, diffuse cloud in the water that disrupts the sensory perception of the predator by acting as a screen or decoy. The opaline, which affects the senses dealing with feeding, causes the predator to instinctively attack the cloud of chemicals as if it were indeed food. 42: 1218: 467:
resembles the food on which it grazes, and cannot be distinguished easily from the seaweed unless the animal is moving. When the sea hares eat algae, they consume toxins, which they store in themselves to repel predators. They can also release these toxins as a purple ink, which will also discourage
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A California sea hare is typically reddish-brown to greenish-brown, but the color varies based on the algae it ingests. Each sea hare houses four tentacles, with two on the head sheltering the eyes, and two on the face surrounding the mouth. The body has two folds, called parapodia, which envelop the
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When it is considerably disturbed, the sea hare is capable of releasing two different kinds of ink from different locations within its mantle cavity, much in the way an octopus does. One ink is reddish-purple and comes from what is called the purple ink gland, while the other is milky white, comes
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has a generation time of 19 weeks: Days 1-37 after hatching from the egg comprise the planktonic stage, days 34-37 are the metamorphic stage, and days 45-80 are the juvenile stage. At about day 30, the larvae move on from the planktonic stage and begin to roost on algae, typically red algae. The
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Coupling lasts for hours or sometimes for days, although the actual passage of the sperm may take only a few minutes. Egg laying normally has to be triggered by copulation, but it occurs spontaneously in individuals kept in isolation for up to 3–4 months (typically these eggs are unfertilized).
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At the base of the right anterior tentacle is the aperture from which the penis can protrude. The genital aperture lies at the anterior end of the mantle cavity, a seminal grove arises from it and runs forward to the penis, at the base of the anterior tentacle.
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The maximum length recorded for the California sea hare is 75 cm (30 in) when crawling, thus fully extended, although most adult specimens are half this size or smaller. Adult animals can weigh up to 7 kg (15 lb). A closely related species,
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Turgeon, D.D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998).
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Copulation occurs most frequently in the early morning, and rarely after 12:30 pm. An individual animal weighing 2,600g was recorded to have laid about 500 million eggs at 27 separate times during less than five months.
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gills for protection but enable water to get by. Below the body is a muscle that allows mobility, almost like a foot. The California sea hare also has an internal shell to protect its organs.
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Janet L. Leonard and Ken Lukowiak. The Behavior of Aplysia californica Cooper (Gastropoda; Opisthobranchia): I. Ethogram. Behaviour Vol. 98, No. 1/4 (Aug., 1986), pp. 320-360
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Because of the toxins in its body that come from consuming algae, the California sea hare has very few predators. Predators include starfish, lobsters, and the ophistobranch
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The typical defence response of the sea hare to a predator is the release of chemicals such as free amino acids, ink from the ink gland, and opaline from the
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Moroz L. L., Ju J., Russo J. J., Puthanveetti S., Kohn A., Medina M., Walsh P. J., Birren B., Lander E. S. & Kandel E. R. (2004) "Sequencing the
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MacFarland, F.M. (1966). Studies of the opisthobranchiate mollusks of the Pacific coast of North America. Mem. Calif. Acad. Sc. VI, p. 1-596
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is known to form mating chains with up to 20 animals. The eggs are yellow-green, and change after 8–9 days into a brown color before
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Watkins et al. Lobster attack induces sensitization in the sea hare, Aplysia californica. J Neurosci. 2010 Aug 18;30(33):11028-31.
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Rosenberg, G.; Bouchet, P. (2011). Aplysia californica J. G. Cooper, 1863. Accessed through: World Register of Marine Species at
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Cummins Scott F, Erpenbeck Dirk, Zou Zhihua, Claudianos Charles, Moroz Leonid L, Nagle Gregg T, Degnan Bernard M (2009).
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plysiid species from Eastern Australia with notes on the Pacific Ocean Aplysiomorpha (Gastropoda, Opisthobranchia).
1507: 1158:"Candidate chemoreceptor subfamilies differentially expressed in the chemosensory organs of the mollusc Aplysia" 971: 59: 1230: 1132:. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). 1071: 513:, a major predator of sea hares, by means of three mechanisms: chemical deterrence, sensory disruption, and 1584: 1356: 600: 586: 1416: 1292: 1203: 410: 180: 1103: 1546: 1437: 1388: 1307: 1252: 945: 887: 590: 665: 608: 562: 197: 476: 1331: 911: 278: 220: 54: 1533: 1130:
Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks
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to graze on algae, mainly the intertidal, usually not deeper than 18–20 m (59–66 ft).
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with cell bodies up to 1 mm in size. Despite its seemingly simple nervous system, though,
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Behavioral Biology of Aplysia: Contribution to the Comparative Study of Opisthobranch Molluscs
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is found along the coast of California, United States, and northwestern Mexico (including the
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hatch. Mating is most prominent during the summer following water temperature rise to 17°C.
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Derby, Charles D.; Kicklighter, Cynthia E.; Johnson, P. M. & Xu Zhang (29 March 2007).
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is capable of a variety of nonassociative and associative learning tasks, including
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from what is called the opaline gland, and contains the aversive chemical opaline.
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Proekt A., Wong J., Zhurov Y., Kozlova N., Weiss K. R., Brezina V. (2008).
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http://www.genome.gov/Pages/Research/Sequencing/SeqProposals/AplysiaSeq.pdf
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Notes on the California species of Aplysia (Gastropoda: Opisthobranchia).
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Genome: a model for single cell, real-time and comparative genomics".
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http://www.marinespecies.org/aphia.php?p=taxdetails&id=240765
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NIH/University of Miami National Resource for Aplysia Facility
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Juvenile on display at Birch Aquarium in San Diego, California
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Transactions of the Zoological Society of London 34: 87-147
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Occurrence is sparse in the northern portion of this range
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December 2011, Joseph Castro 30 (30 December 2011).
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Robert Hugh Morris; Eugene Clinton Haderlie (1980).
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in March 2005. The draft genome is available on the
1363: 320:, simultaneously acting as male and female during 970:Edythe McNamee and Jacque Wilson (14 May 2013). 551:, and is especially associated with the work of 1094:. NIH new Releases, Last Updated: 12 June 2009. 316:Like all sea hares, the California sea hare is 998:Teaching physics : with the physics suite 266:in the United States and northwestern Mexico. 304:, the black sea hare, can grow larger still. 8: 1297:: CS1 maint: multiple names: authors list ( 1208:: CS1 maint: multiple names: authors list ( 1054:: CS1 maint: numeric names: authors list ( 682:. San Francisco: W. H. Freeman and Company. 1351: 634:. Stanford University Press. p. 348. 206: 40: 31: 1274: 1264: 1185: 1175: 1227:National Human Genome Research Institute 1088:National Human Genome Research Institute 972:"A Nobel Prize with help from sea slugs" 766: 764: 762: 605:National Human Genome Research Institute 565:studies can be attributed to its simple 660: 658: 620: 344: 1605:Marine fauna of the Gulf of California 1290: 1201: 1104:aplCal1 at UCSC Genome Browser Gateway 1047: 1001:. Hoboken, NJ: John Wiley & Sons. 774:. W.H. Freeman and Co., San Francisco. 631:Intertidal Invertebrates of California 818: 816: 814: 7: 443:species, the California sea hare is 49:Releasing ink after being disturbed 824:"Insided Look: California Sea Hare" 770:Kandel, Eric Behavioral biology of 25: 1580:Taxa named by James Graham Cooper 1306:Wayne N. L., Block G. D. (1992). 595:gill and siphon withdrawal reflex 447:. Its diet consists primarily of 1590:Marine molluscs of North America 1216: 828:Catalina Island Marine Institute 509:Inking provides protection from 468:predators from attacking them. 391: 374: 362: 347: 58: 944:Inman, Mason (29 March 2005). 603:was approved as a priority by 601:Sequencing of its whole genome 354:Out of water at low tide near 1: 1595:Molluscs of the Pacific Ocean 1575:Gastropods described in 1863 1266:10.1371/journal.pone.0003678 946:"Sea Hares Lose Their Lunch" 1069:Approved Sequencing Targets 880:Journal of Chemical Ecology 786:"California Brown Sea Hare" 743:"California Brown Sea Hare" 497:which will take juveniles. 1621: 1117:The Veliger 5(4): 145–147. 995:Redish, Edward F. (2003). 784:Pacific, Aquarium of the. 741:Pacific, Aquarium of the. 1233:Accessed 20 November 2009 900:10.1007/s10886-007-9279-0 790:www.aquariumofpacific.org 747:www.aquariumofpacific.org 678:Kandel, Eric. R. (1979). 539:, used in studies of the 226: 219: 214: 205: 186: 179: 55:Scientific classification 53: 48: 39: 34: 258:in the sea hare family, 1316:The Biological Bulletin 705:from the Sea Slug Forum 1177:10.1186/1741-7007-7-28 1140:. IX, 526 + cd-rom pp. 1120:Bebbington A. (1977) A 535:has become a valuable 488: 718:"Aplysia californica" 505:Protective mechanisms 480:Close-up showing the 479: 411:Monterey Bay Aquarium 722:Animal Diversity Web 591:operant conditioning 285:species inhabit the 35:California sea hare 27:Species of gastropod 1600:Fauna of California 1394:Aplysia_californica 1365:Aplysia californica 1310:Aplysia californica 1257:2008PLoSO...3.3678P 1113:Beeman R.D. (1963) 925:on 15 November 2009 892:2007JCEco..33.1105D 703:Aplysia californica 609:UCSC Genome browser 563:synaptic plasticity 486:Aplysia californica 461:Ceramium eatonianum 457:Plocamium pacificum 422:Sexual reproduction 247:Aplysia californica 242:California sea hare 198:James Graham Cooper 190:Aplysia californica 172:A. californica 18:California sea slug 1074:2012-07-27 at the 489: 453:Laurencia pacifica 279:Gulf of California 1557: 1556: 1357:Taxon identifiers 886:(33): 1105–1113. 641:978-0-8047-1045-9 537:laboratory animal 401: 238: 237: 233: 115:Euopisthobranchia 16:(Redirected from 1612: 1550: 1549: 1537: 1536: 1524: 1523: 1511: 1510: 1498: 1497: 1485: 1484: 1472: 1471: 1459: 1458: 1446: 1445: 1433: 1432: 1420: 1419: 1407: 1406: 1397: 1396: 1384: 1383: 1382: 1352: 1347: 1302: 1296: 1288: 1278: 1268: 1220: 1213: 1207: 1199: 1189: 1179: 1106: 1101: 1095: 1085: 1079: 1066: 1060: 1059: 1053: 1045: 1043: 1042: 1027: 1021: 1020: 992: 986: 985: 983: 982: 967: 961: 960: 958: 956: 941: 935: 934: 932: 930: 924: 918:. 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Index

California sea slug

Scientific classification
Edit this classification
Eukaryota
Animalia
Mollusca
Gastropoda
Euopisthobranchia
Anaspidea
Aplysioidea
Aplysiidae
Aplysia
Binomial name
James Graham Cooper

Synonyms
species
sea slug
Aplysiidae
California
Gulf of California
photic zone
Aplysia vaccaria
hermaphroditic
mating
larvae
Out of water at low tide near Morro Bay
Morro Bay
Juvenile on display at Birch Aquarium in San Diego, California

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