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Monogenea

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Monogenea are small parasitic flatworms mainly found on skin or gills of fish. They are rarely longer than about 2 cm. A few species infecting certain marine fish are larger, and marine forms are generally larger than those found on freshwater hosts. Monogenea are often capable of dramatically
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Freshwater fish that become infected with this parasite become lethargic and end up swimming towards the surface of the water. In addition, some may be seen rubbing the bottom or sides of their skin where the parasite is located. Infected skin where the parasite is attached may show areas of scale
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have multiple parts to the haptor, typically clamps. These groups are also known as Polyonchoinea and Heteronchoinea, respectively. Polyopisthocotyleans are almost exclusively gill-dwelling blood feeders, whereas monopisthocotyleans may live on the gills, skin, and fins.
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Monogeneans lack respiratory, skeletal, and circulatory systems but they do have posterior attachment structures in the form of adhesives, clamps, hamuli and suckers. Like other flatworms, Monogenea have no true
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In salt water fish, Monogeneans can infect the skin and gills, resulting in irritations to the host. Heavy infections could result in erratic swimming behavior. Affected gills may become irritated and swollen.
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loss and may produce a pinkish fluid. Gills that are infected may appear swollen and pale. "Pipping", which is gulping for air at the water surface, could indicate severe respiratory distress.
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were derived. Another view is that the rhabdocoel ancestor gave rise to two lines; one gave rise to monogeneans, which gave rise to digeneans, and the other line gave rise to cestodes".
257:, or fins of fish. They have a direct lifecycle and do not require an intermediate host. Adults are hermaphrodites, meaning they have both male and female reproductive structures. 838: 882: 851:
Monogeneans possess the simplest lifecycle among the parasitic platyhelminths. They have no intermediate hosts and are ectoparasitic on fish (seldom in the
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Boeger, Walter A.; Kritsky, Delane C. (2001). "Phylogenetic relationships of the Monogenoidea". In Littlewood, D.T.J.; Bray, R.A. (eds.).
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elongating and shortening as they move. Biologists need to ensure that specimens are completely relaxed before measurements are taken.
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with functional reproductive organs of both sexes occurring in one individual. Most species are oviparous, but a few are viviparous.
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Like all ectoparasites, monogeneans have well-developed attachment structures. The anterior structures are collectively termed the
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L.A. Tubbsa et al. (2005). "Effects of temperature on fecundity in vitro, egg hatching and reproductive development of
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Some parasitologists divide the Monogenea into two (or three) subclasses based on the complexity of their haptor: the
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much larger and lives on the skin of many tropical marine species, causing problematic infections in marine aquaria.
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Monogenea are Platyhelminthes, so are among the lowest invertebrates to possess three embryonic germ layers—
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http://www.aces.edu/dept/fisheries/education/ras/publications/Update/Monogenean%20Parasites%20of%20Fish.pdf
341:. In addition, they have a head region that contains concentrated sense organs and nervous tissue (brain). 86: 356:. The posterior opisthaptor with its hooks, anchors, clamps etc. is typically the major attachment organ. 1874: 1685: 1672: 1550: 1130: 1529: 1268: 53: 17: 1833: 163: 68: 1690: 1534: 1595: 1161: 1846: 1480: 1468: 1412: 1258: 46: 994: 1612: 1441: 1331: 1210: 1498: 1338: 1216: 1145: 1820: 318:(coelom). They have a simple digestive system consisting of a mouth opening with a muscular 1711: 1659: 1486: 1448: 1429: 1381: 1306: 1235: 1189: 721:
have one main part to the haptor, often with hooks or a large attachment disc, whereas the
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and is oviparous. This is one of the largest metazoan genera, with at least 970 species.
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Theunissen, M., Tiedt, L. & Du Preez, L. H. 2014: The morphology and attachment of
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The ancestors of Monogenea were probably free-living flatworms similar to modern
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flatworm :: Annotated classification - Britannica Online Encyclopedia
1776: 1644: 1461: 1300: 1171: 863: 797: 777: 696: 315: 1768: 1555: 1435: 1156: 805: 427: 265: 205: 1781: 995:"Phylogenetics of the Monogenea – evidence from a medley of molecules" 1724: 1590: 1570: 1560: 1474: 1368: 1318: 769: 700: 372: 261: 175: 1606: 35: 1729: 1629: 1312: 801: 704: 338: 334: 330: 250: 195: 1166: 887: 819: 319: 1716: 1503: 1374: 934:(Monogenea) parasitic on yellowtail kingfish Seriola lalandi". 856: 353: 185: 1069:(Monogenea: Polystomatidae) infecting the African clawed frog 1828: 877: 284: 254: 323: 348:, while the posterior ones are collectively termed the 272:
is an example of a viviparous variety, while the genus
992: 60:. Unsourced material may be challenged and removed. 375:relationships of the different monogenean orders: 950:Reed, Peggy et al. Monogenean Parasites of Fish. 1861: 1129: 232: 1115: 1040: 1094:Monogenea – ectoparasitic flukes (flatworms) 690: 952:Institute of Food and Agricultural Sciences 322:and an intestine with no terminal opening ( 1122: 1108: 142: 1043:Interrelationships of the Platyhelminthes 969:Roberts, S. Larry & John Janovy, Jr. 120:Learn how and when to remove this message 842:, a parasite of the African clawed frog 831: 827: 714:and thousands of species are described. 283: 993:Olson PD, Littlewood DTJ (March 2002), 276:is an example of an oviparous variety. 14: 1862: 1002:International Journal for Parasitology 946: 944: 936:International Journal for Parasitology 800:and primitive freshwater fish such as 1611: 1610: 1242:Photobacterium damselae ssp piscicida 1201:Hypodermal and hematopoietic necrosis 1103: 922: 920: 918: 279: 1834:357D87B8-9A54-9577-FC0A-FAF9FDDD97AC 1756:3bdaa364-aa35-480c-8213-6d6e7effcfb0 965: 963: 371:The following cladogram depicts the 58:adding citations to reliable sources 29: 941: 24: 915: 817:is found in aquatic clawed toads ( 742:has no eyespots and is viviparous. 304: 25: 1886: 1087: 960: 1525:Diseases and parasites in salmon 359:Generally, monogeneans also are 162: 34: 27:Class of ectoparasitic flatworms 249:, are a group of ectoparasitic 45:needs additional citations for 1581:Neurotoxic shellfish poisoning 1206:Infectious pancreatic necrosis 1059: 1034: 986: 975: 890:, parasitizing the eye of the 13: 1: 1586:Paralytic shellfish poisoning 1566:Diarrheal shellfish poisoning 1520:Diseases and parasites in cod 1493:Tetracapsuloides bryosalmonae 1364:Epizootic ulcerative syndrome 1014:10.1016/S0020-7519(01)00328-9 908: 876:No known monogeneans infect 366: 253:commonly found on the skin, 7: 1551:Amnesic shellfish poisoning 1131:Fish diseases and parasites 1045:(1st ed.). CRC Press. 971:Foundations of Parasitology 897: 10: 1891: 1530:Disease in ornamental fish 264:(egg-laying) and some are 1619: 1543: 1535:List of aquarium diseases 1512: 1292: 1137: 691:Systematics and evolution 637: 622: 615: 600: 593: 577: 570: 515: 500: 493: 469: 454: 447: 440: 425: 418: 403: 396: 386: 230: 225: 159:Scientific classification 157: 150: 141: 136: 1596:Scombroid food poisoning 1079:10.1051/parasite/2014020 1067:Protopolystoma xenopodis 905: – Family of worms 839:Protopolystoma xenopodis 1481:Sphaerothecum destruens 1469:Schistocephalus solidus 1413:Lernaeocera branchialis 1259:Spring viraemia of carp 836:Eggs of the monogenean 768:All of these can cause 245:, members of the class 1442:Nanophyetus salmincola 1332:Clinostomum marginatum 1184:Hematopoietic necrosis 1152:Nervous necrosis virus 883:Oculotrema hippopotami 866:). Although they are 848: 796:is primarily found in 293: 1339:Dactylogyrus vastator 1217:Mycobacterium marinum 1146:Aeromonas salmonicida 835: 828:Ecology and lifecycle 287: 260:Some monogeneans are 152:Echinoplectanum laeve 1751:Fauna Europaea (new) 1487:Swim bladder disease 1449:Pseudorhabdosynochus 1430:Myxobolus cerebralis 1382:Gyrodactylus salaris 1307:Amoebic gill disease 1236:Pfiesteria piscicida 1190:Heterosigma akashiwo 1073:. Parasite, 21, 20. 54:improve this article 1389:Henneguya zschokkei 1253:Streptococcus iniae 1096:- Clinical Sciences 290:Diplozoon paradoxum 1875:Protostome classes 1222:Aquarium granuloma 928:Benedenia seriolae 849: 784:Polyopisthocotylea 723:Polyopisthocotylea 567:Polyopisthocotylea 472:Montchadskyellidea 294: 280:Signs and symptoms 1857: 1856: 1816:Open Tree of Life 1613:Taxon identifiers 1604: 1603: 1325:Ceratomyxa shasta 932:Zeuxapta seriolae 730:Monopisthocotylea 719:Monopisthocotylea 703:, from which the 687: 686: 678: 677: 668: 667: 659: 658: 650: 649: 555: 554: 546: 545: 537: 536: 528: 527: 482: 481: 393:Monopisthocotylea 240: 239: 221: 130: 129: 122: 104: 16:(Redirected from 1882: 1850: 1849: 1837: 1836: 1824: 1823: 1811: 1810: 1798: 1797: 1785: 1784: 1772: 1771: 1759: 1758: 1746: 1745: 1733: 1732: 1720: 1719: 1707: 1706: 1694: 1693: 1681: 1680: 1668: 1667: 1655: 1654: 1653: 1640: 1639: 1638: 1608: 1607: 1395:Ich (freshwater) 1359:Eustrongylidosis 1346:Diphyllobothrium 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679: 674:Heteronchoinea 669: 660: 651: 625:Diclybothriidea 603:Chimaericolidea 556: 547: 538: 529: 483: 457:Lagarocotylidea 369: 307: 305:Characteristics 282: 218: 196:Platyhelminthes 161: 126: 115: 109: 106: 63: 61: 51: 39: 28: 23: 22: 15: 12: 11: 5: 1888: 1878: 1877: 1872: 1855: 1854: 1852: 1851: 1838: 1825: 1812: 1799: 1786: 1773: 1760: 1747: 1738:Fauna Europaea 1734: 1721: 1708: 1695: 1682: 1669: 1656: 1641: 1625: 1623: 1617: 1616: 1602: 1601: 1599: 1598: 1593: 1588: 1583: 1578: 1576:Marine viruses 1573: 1568: 1563: 1558: 1553: 1547: 1545: 1544:Related topics 1541: 1540: 1538: 1537: 1532: 1527: 1522: 1516: 1514: 1510: 1509: 1507: 1506: 1501: 1496: 1489: 1484: 1477: 1472: 1465: 1458: 1453: 1445: 1438: 1433: 1426: 1421: 1416: 1409: 1402: 1397: 1392: 1385: 1378: 1371: 1366: 1361: 1356: 1349: 1342: 1335: 1328: 1321: 1316: 1309: 1304: 1296: 1294: 1290: 1289: 1287: 1286: 1281: 1276: 1271: 1266: 1264:Taura syndrome 1261: 1256: 1249: 1244: 1239: 1232: 1225: 1213: 1208: 1203: 1198: 1193: 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273: 270:Gyrodactylus 269: 259: 246: 242: 241: 231: 215: 202:Superclass: 151: 131: 116: 107: 97: 90: 83: 76: 64: 52:Please help 47:verification 44: 1777:iNaturalist 1645:Wikispecies 1513:Fish groups 1462:Saprolegnia 1456:Salmon lice 1301:Abergasilus 1172:Fish dropsy 880:, but one ( 864:vertebrates 798:marine fish 778:aquaculture 697:Turbellaria 350:opisthaptor 316:body cavity 243:Monogeneans 220:Carus, 1863 69:"Monogenea" 1864:Categories 1556:Brevetoxin 1436:Myxosporea 1284:Yellowhead 1279:White spot 1157:Columnaris 909:References 886:) infects 806:paddlefish 770:epizootics 428:Capsalidea 266:viviparous 226:Subgroups 206:Neodermata 137:Monogenea 110:March 2007 80:newspapers 18:Monogenean 1870:Monogenea 1678:Monogenea 1665:Monogenea 1651:Monogenea 1621:Monogenea 1591:Saxitoxin 1571:Fish kill 1561:Ciguatera 1475:Sea louse 1424:Monogenea 1319:Carp lice 1293:Parasites 1138:Pathogens 823:species). 802:sturgeons 786:include: 751:has four 732:include: 710:About 50 701:digeneans 383:Monogenea 367:Phylogeny 346:prohaptor 262:oviparous 251:flatworms 247:Monogenea 216:Monogenea 182:Kingdom: 176:Eukaryota 1630:Wikidata 1313:Anisakis 1022:11835967 898:See also 753:eyespots 712:families 705:cestodes 339:ectoderm 335:mesoderm 331:endoderm 233:See text 192:Phylum: 186:Animalia 172:Domain: 1769:7774442 1717:2553362 1636:Q575927 1167:Fin rot 1027:May 19, 888:mammals 820:Xenopus 320:pharynx 212:Class: 94:scholar 1821:473600 1782:209067 1730:1MONGC 1504:Xenoma 1499:Velvet 1375:Glugea 1369:Flukes 1049:  1020:  857:rectum 811:Genus 790:Genus 758:Genus 745:Genus 736:Genus 354:haptor 337:, and 96:  89:  82:  75:  67:  1842:WoRMS 1829:Plazi 1808:37945 1795:54557 1743:16177 1704:62269 998:(PDF) 954:. . 878:birds 255:gills 101:JSTOR 87:books 1803:NCBI 1790:ITIS 1764:GBIF 1725:EPPO 1686:BOLD 1452:spp. 1047:ISBN 1029:2022 1018:PMID 930:and 855:and 804:and 324:anus 73:news 1847:798 1712:EoL 1699:CoL 1673:AFD 1660:ADW 1274:VHS 1269:UDN 1075:doi 1010:doi 859:of 772:in 326:). 56:by 1866:: 1844:: 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Index

Monogenean

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Scientific classification
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Eukaryota
Animalia
Platyhelminthes
Neodermata
Monogenea
See text
flatworms
gills
oviparous
viviparous

Diplozoon paradoxum
body cavity
pharynx
anus

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