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Mangrove horseshoe crab

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390: 42: 424:, females are about 30.5–31.5 cm (12.0–12.4 in) long, including a tail that is about 16.5–19 cm (6.5–7.5 in), and their carapace (prosoma) is about 16–17.5 cm (6.3–6.9 in) wide. In comparison, the average for males is about 28–30.5 cm (11.0–12.0 in) long, including a tail that is about 15–17.5 cm (5.9–6.9 in), and their carapace is about 14.5–15 cm (5.7–5.9 in) wide. There are significant geographic variations in the size, but this does not follow a clear north–south or east–west pattern. Those from 586: 474:. This is the habitat for which it gains its common name: mangrove horseshoe crab. Scientists have studied the distribution of mangrove horseshoe crabs in Hong Kong specifically. The researchers noted their abundance on the beaches of Hong Kong before the sharp decline in population over the past ten years. In the study, they found an uneven distribution of the horseshoe crabs throughout Hong Kong, with a greater abundance found in the western waters. They predict this unevenness is due to the 86: 61: 449:. The main function of these compound eyes is to find a mate. In addition, they have two median eyes, two rudimentary lateral eyes, and an endoparietal eye on their carapace and two ventral eyes located on the underside by the mouth. Scientists believe the two ventral eyes aid in the orientation of the horseshoe crab when swimming. Each individual has six pairs of appendages. The first pair, the 417:. The smaller rear carapace with spines on the edge is the opisthosoma. The rear extension that looks like a spike is the telson, which is commonly described as the tail. Uniquely among the horseshoe crabs, the cross section of the tail of the mangrove horseshoe crab is rounded. It is essentially triangular in the other species. The tail is used to turn itself right side up when overturned. 1346: 469:
This species occurs only in Asia around the Indo-West Pacific region where the climate is tropical or subtropical. These horseshoe crabs can be found to exist throughout southeast Asia in shallow waters with soft, sandy bottoms or extensive mud flats. The mangrove horseshoe crab is benthopelagic,
457:(first pair) and the pusher legs (remaining four pairs). Most of the appendages have straight, scissor-like claws, but in males the first and second pair of walking legs have strongly hooked "scissors", which are used for grasping the female during mating. Located behind their legs are 366:
look almost identical to those species that are still alive today. The long existence of this body plan suggests its success. The three Asian species of horseshoe crabs form their own clade, and it is estimated that they diverged from the American species between
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in India average somewhat smaller than those from Peninsular Malaysia, with a carapace width of about 16 cm (6.3 in) and 14 cm (5.5 in) in females and males respectively. Elsewhere it averages even smaller, with the smallest reported from the
553:. During the mating period, the males will follow and cling to the backs of their potential mates using modified prosomal appendages for long periods of time before the egg-laying has occurred. Horseshoe crab species with low spawning densities and 1:1 569:
them. Once the eggs are laid, the male and female go back to the ocean, and the eggs develop on their own. Their eggs are large, and after a couple weeks, the eggs hatch into miniature versions of the adults. The females lay about 3500 of them.
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Koichi Sekiguchi; Carl N. Shuster Jr (2009). "Limits on the Global Distribution of Horseshoe Crabs (Limulacea): Lessons Learned from Two Lifetimes of Observations: Asia and America". In Tanacredi, John T.; Botton, Mark L.; Smith, David (eds.).
533:. The crop can expand to fit the ingested food, while the gizzard grinds the food into a pulp. Studies have found that mangrove horseshoe crabs have a strong preference for insect larvae over the other organisms on which it also feeds. 437:
regions in Indonesia where the carapace width of females is about 13 cm (5.1 in) and in males 11 cm (4.3 in). The largest females of the species may reach up to 40 cm (16 in) in length, including the tail.
453:, are relatively small and placed in front of the mouth. They are used to place food in it. The remaining five pairs of legs are placed on either side of the mouth and are used for walking/pushing. These are the 1017:"A New Record on the Morphometric Variations in the Populations of Horseshoe Crab (Carcinoscorpius rotundicauda Latreille) Obtained from Two Different Ecological Habitats of Peninsular Malaysia" 886:
Prashant Shingate; Vydianathan Ravi; Aravind Prasad; Boon Hui Tay & Byrappa Venkatesh (2020). "Chromosome-level genome assembly of the coastal Horseshoe Crab (Tachypleus gigas)".
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Kelvin K. P. Lim; Dennis H. Murphy; T. Morgany; N. Sivasothi; Peter K. L. Ng; B. C. Soong; Hugh T. W. Tan; K. S. Tan & T. K. Tan (2001). Peter K. L. Ng & N. Sivasothi (eds.).
525:, it grinds up the food with bristles on its legs and places it in its mouth using its chelicerae. The ingested food then enters the cuticle-lined oesophagus and then the 1307:
Kanchanapongkul, J.; Krittayapoositpot, P. (June 1995). "An epidemic of tetrodotoxin poisoning following ingestion of the horseshoe crab Carcinoscorpius rotundicauda".
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The mangrove horseshoe crab is the smallest of the four living species of horseshoe crabs. Like the other species, females grow larger than males. On average in
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There have occasionally been cases of food poisonings or even deaths after consuming the crabs as they were misidentified as another horseshoe crab species,
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Rudkin, D. M.; Young, G. A. (2009). "Horseshoe Crabs – an Ancient Ancestry Revealed". In Tanacredi, John T.; Botton, Mark L.; Smith, David (eds.).
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In the spring, horseshoe crabs migrate from the deeper water to the shallow, muddy areas. Nesting usually follows the cycle of the
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because they have remained practically unchanged in terms of shape and size for millions of years. Although their
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Mangrove horseshoe crabs in Singapore breed from August to April. Juveniles grow about 33% bigger each time they
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Thousands of the horseshoe crabs are caught by local fishermen. While the crabs have very little flesh, their
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spending most of its life close to or at the bottom of a body of their brackish, swampy water habitat, such as
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Helen M. C. Chiu & Brian Morton (2003). "The morphological differentiation of two horseshoe crab species,
585: 1293: 561:. In addition, the female does not choose her mate. Males find their female mates with the use of visual and 1364: 1094: 715:
Vestbo, Stine; Obst, Matthias; Fernandez, Francisco J. Quevedo; Intanai, Itsara; Funch, Peter (May 2018).
566: 305: 1429: 187: 164: 577:, and it takes the juveniles about five molts to grow from 2 centimetres (0.79 in) to adult size. 717:"Present and Potential Future Distributions of Asian Horseshoe Crabs Determine Areas for Conservation" 1585: 1450: 1411: 1237: 1203: 693: 558: 482: 421: 50: 319:
is considerably smaller than the others and the only species where the cross section of the tail (
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Myers, P.; Espinosa, R.; Parr, C. S.; Jones, T.; Hammond, G. S.; Dewey, T. A., eds. (2023).
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signals. Once a mate is found, the female digs a hole and lays the eggs while the male
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T.C. Srijaya; P.J. Pradeep; S. Mithun; A. Hassan; F. Shaharom; A. Chatterji (2010).
960: 648: 628: 1442: 461:. These gills are used for propulsion to swim and to exchange respiratory gases. 1567: 1476: 1396: 1150: 1059: 836: 602: 510: 478: 442: 425: 406: 348: 340: 315:. All four extant species of horseshoe crabs are anatomically very similar, but 281: 250: 127: 1387: 794: 1198: 952: 450: 430: 336: 265: 1320: 1175:
Jennifer H. Mattei; Mark A. Beekey; Adam Rudman & Alyssa Woronik (2010).
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H. Zhou & Brian Morton (2004). "The diets of juvenile horseshoe crabs,
907: 1345: 1328: 1229:"Population structure and breeding pattern of the mangrove horseshoe crab 309:, have not been as well documented as those of the North American species 1381: 1033: 1016: 550: 518: 454: 414: 284:, but confirmed records are lacking. It is the only species in the genus 257: 1468: 530: 498: 475: 434: 402: 344: 331:
Horseshoe crabs are commonly known by biologists around the world as a
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The basic body plan of a horseshoe crab consists of three parts: the
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The Southeast Asian Journal of Tropical Medicine and Public Health
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Lesley Cartwright-Taylor; Julian Lee & Chia Chi Hsu (2019).
1177:"Reproductive behavior in horseshoe crabs: does density matter?" 875:. Guide to the Mangroves of Singapore. Singapore Science Centre. 574: 514: 506: 489:
can coexist in the same habitat as the mangrove horseshoe crab.
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is prized as a delicacy, in Thailand most commonly served as a
598: 522: 937:(Xiphosura), in Hong Kong with a regional Asian comparison". 413:). The prosoma is the large, dome-shaped frontal part at the 359:
era. Fossils of horseshoe crabs that have been dated to over
557:, such as the mangrove horseshoe crab, are found to be 339:
has changed over the years, their typical three piece
1371: 789: 787: 785: 783: 781: 779: 777: 775: 976: 974: 972: 970: 529:. The proventriculus is made up of a crop and a 323:) is rounded instead of essentially triangular. 297:and the two other Asian horseshoe crab species, 1294:"~Horseshoe Crab Egg Salad Recipe, ยำไข่แมงดา~" 1268:"Horseshoe crabs galloping towards extinction" 1046: 1044: 293:The biology, ecology and breeding patterns of 647:World Conservation Monitoring Centre (1996). 8: 1081:Helen M. C. Chiu & Brian Morton (1999). 986:Biology and Conservation of Horseshoe Crabs 823:Biology and Conservation of Horseshoe Crabs 814: 812: 672:10.2305/IUCN.UK.1996.RLTS.T3856A10123044.en 1359: 760:. University of Michigan Museum of Zoology 59: 40: 31: 1250: 1197: 1170: 1168: 1032: 732: 670: 481:in the western waters, influenced by the 1122: 1120: 639: 497:Mangrove horseshoe crabs are selective 1083:"The distribution of horseshoe crabs ( 858: 856: 7: 1609:IUCN Red List data deficient species 873:A Guide to Mangroves of Singapore 1 658:IUCN Red List of Threatened Species 589:Mangrove horseshoe crabs caught in 501:feeders, feeding mainly on insect 25: 627:is known to often contain lethal 1344: 696:. Horseshoe Crab monitoring site 84: 1266:Bibhuti Pati (June 24, 2008). 894:(6). Wiley Online: 1748–1760. 1: 355:, has remained since the mid- 256:found in tropical marine and 1403:Carcinoscorpius rotundicauda 1373:Carcinoscorpius rotundicauda 1352:Carcinoscorpius rotundicauda 1231:Carcinoscorpius rotundicauda 1133:Carcinoscorpius rotundicauda 1089:Carcinoscorpius rotundicauda 1054:Carcinoscorpius rotundicauda 935:Carcinoscorpius rotundicauda 867:Carcinoscorpius rotundicauda 651:Carcinoscorpius rotundicauda 238:Carcinoscorpius rotundicauda 197:Carcinoscorpius rotundicauda 18:Carcinoscorpius rotundicauda 1151:10.1080/0022293031000155377 888:Molecular Ecology Resources 837:10.1007/978-0-387-89959-6_2 721:Frontiers in Marine Science 445:, horseshoe crabs have two 393:Mangrove horseshoe crab in 243:round-tailed horseshoe crab 1645: 1270:. Merinews. Archived from 1138:Journal of Natural History 1101:Hong Kong University Press 1056:, mangrove horseshoe crab" 940:Journal of Natural History 865:"Mangrove horseshoe crab, 1629:Animals described in 1985 1093:. In Brian Morton (ed.). 953:10.1080/00222930210149753 215: 208: 193: 186: 81:Scientific classification 79: 57: 48: 39: 34: 734:10.3389/fmars.2018.00164 465:Distribution and habitat 35:Mangrove horseshoe crab 1199:10.1093/czoolo/56.5.634 900:10.1111/1755-0998.13233 485:. They also found that 379: million years ago 372: million years ago 364: million years ago 272:. It may also occur in 233:mangrove horseshoe crab 1129:Tachypleus tridentatus 1085:Tachypleus tridentatus 931:Tachypleus tridentatus 694:"Identification guide" 594: 398: 306:Tachypleus tridentatus 990:. Springer. pp.  588: 567:externally fertilizes 392: 241:), also known as the 1355:at Wikimedia Commons 1103:. pp. 185–196. 1096:Asian Marine Biology 1034:10.3126/on.v8i1.4329 797:. The Horseshoe Crab 758:Animal Diversity Web 665:: e.T3856A10123044. 327:Evolutionary history 219:Limulus rotundicauda 179:C. rotundicauda 27:Species of arthropod 1619:Arthropods of China 869:, family Limulidae" 795:"About the Species" 422:Peninsular Malaysia 51:Conservation status 1624:Fauna of Hong Kong 1274:on October 5, 2012 595: 399: 395:Bako National Park 343:, consisting of a 312:Limulus polyphemus 245:, is a species of 1596: 1595: 1555:Open Tree of Life 1365:Taxon identifiers 1349:Media related to 1145:(15): 1915–1925. 1110:978-962-209-520-5 1001:978-0-387-89959-6 947:(19): 2369–2382. 846:978-0-387-89958-9 607:yam khai maeng da 517:and thin-shelled 229: 228: 223: 203:(Latreille, 1802) 168: 74: 16:(Redirected from 1636: 1589: 1588: 1576: 1575: 1563: 1562: 1550: 1549: 1537: 1536: 1524: 1523: 1511: 1510: 1498: 1497: 1485: 1484: 1472: 1471: 1459: 1458: 1446: 1445: 1433: 1432: 1420: 1419: 1407: 1406: 1405: 1392: 1391: 1390: 1360: 1348: 1333: 1332: 1304: 1298: 1297: 1290: 1284: 1283: 1281: 1279: 1263: 1257: 1256: 1254: 1224: 1218: 1217: 1215: 1214: 1208: 1202:. Archived from 1201: 1181: 1172: 1163: 1162: 1124: 1115: 1114: 1099:. 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Lacking 459:book gills 451:chelicerae 431:Balikpapan 397:, Malaysia 337:physiology 266:Bangladesh 260:waters of 118:Arthropoda 1614:Xiphosura 1321:0125-1562 1245:: 61–69. 1066:April 23, 916:220853600 551:new moons 543:high tide 476:estuarine 472:mangroves 455:pedipalps 357:Paleozoic 274:Sri Lanka 254:arthropod 173:Species: 148:Limulidae 138:Xiphosura 104:Kingdom: 98:Eukaryota 1495:10002424 1388:Q2673503 1382:Wikidata 1159:84518612 961:84286729 908:32725950 621:T. gigas 591:Chonburi 519:bivalves 513:, small 505:, small 415:carapace 280:and the 258:brackish 210:Synonyms 144:Family: 114:Phylum: 108:Animalia 94:Domain: 71:IUCN 2.3 1560:1089003 1469:1010612 1329:8629077 1278:June 1, 801:26 June 700:27 June 605:called 545:of the 531:gizzard 499:benthic 435:Belawan 403:prosoma 385:Anatomy 345:prosoma 278:Myanmar 154:Genus: 134:Order: 69: ( 1586:238267 1547:238267 1482:362577 1456:393281 1430:235649 1327:  1319:  1157:  1107:  1062:. 2010 998:  959:  914:  906:  843:  503:larvae 411:telson 405:, the 353:telson 351:, and 321:telson 268:, and 167:, 1902 165:Pocock 1581:WoRMS 1508:82707 1490:IRMNG 1207:(PDF) 1180:(PDF) 1155:S2CID 994:–24. 957:S2CID 912:S2CID 831:–44. 603:salad 515:crabs 262:India 1542:OBIS 1534:6848 1529:NCBI 1521:3856 1516:IUCN 1503:ITIS 1464:GBIF 1443:R48H 1425:BOLD 1325:PMID 1317:ISSN 1280:2011 1131:and 1105:ISBN 1087:and 1068:2011 996:ISBN 933:and 904:PMID 841:ISBN 803:2018 766:2023 702:2018 680:2021 663:1996 575:molt 549:and 547:full 523:jaws 507:fish 493:Diet 433:and 303:and 249:, a 231:The 1451:EoL 1438:CoL 1412:ADW 1247:doi 1194:doi 1147:doi 1029:doi 949:doi 896:doi 833:doi 729:doi 667:doi 599:roe 381:. 377:436 374:to 370:135 362:400 1605:: 1583:: 1573:25 1570:: 1557:: 1544:: 1531:: 1518:: 1505:: 1492:: 1479:: 1466:: 1453:: 1440:: 1427:: 1414:: 1399:: 1384:: 1323:. 1313:26 1311:. 1241:. 1235:. 1190:56 1188:. 1182:. 1167:^ 1153:. 1143:38 1141:. 1119:^ 1058:. 1043:^ 1023:. 1019:. 969:^ 955:. 945:37 943:. 910:. 902:. 892:20 890:. 871:. 855:^ 839:. 829:25 811:^ 774:^ 756:. 723:. 719:. 661:. 655:. 631:. 623:, 509:, 347:, 290:. 276:, 264:, 1331:. 1282:. 1255:. 1249:: 1243:8 1216:. 1196:: 1161:. 1149:: 1113:. 1070:. 1052:" 1037:. 1031:: 1025:8 1004:. 992:5 963:. 951:: 918:. 898:: 849:. 835:: 805:. 768:. 754:" 750:" 737:. 731:: 725:5 704:. 682:. 669:: 653:" 649:" 617:. 235:( 73:) 20:)

Index

Carcinoscorpius rotundicauda

Conservation status
Data Deficient
IUCN 2.3
Scientific classification
Edit this classification
Eukaryota
Animalia
Arthropoda
Chelicerata
Xiphosura
Limulidae
Carcinoscorpius
Pocock
Binomial name
Synonyms
horseshoe crab
chelicerate
arthropod
brackish
India
Bangladesh
Southeast Asia
Sri Lanka
Myanmar
Philippines
Tachypleus gigas
Tachypleus tridentatus
Limulus polyphemus

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