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Centers for Disease Control/Division of Parasitic Diseases and Malaria
EOL staff
Life cycle of acanthocephalans Moniliformis moniliformis and Macracanthorhynchus hirudinaceus Eggs are shed in the feces of the definitive hosts (1), which are usually rats in the case of M. moniliformis and swine for M. hirudinaceous, although carnivores and primates, including humans, may serve as accidental hosts. The eggs contain a fully-developed acanthor when shed in feces. The eggs are ingested by an insect intermediate host (2) (usually scarabaeoid or hydrophilid beetles for M. hirudinaceus and beetles or cockroaches for M. moniliformis). Within the hemocoelom of the insect, the acanthor (2a) molts into a second larval stage, called an acanthella (2b). After 6-12 weeks, the worm reaches the infective stage called a cystacanth (2c). The definitive host becomes infected upon ingestion of intermediate hosts containing infective cystacanths (3). In the definitive host, liberated juveniles attach to the wall of the small intestine, where they mature (4) and mate in about 8-12 weeks. In humans (5), the worms seldom mature, or mature but will rarely produce eggs.From
Centers for Disease Control Parasites and Health website
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Parasite in the small intestine of Grey Seals near the Magdalen Islands, Canada.
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USNM 1356514, USNPC 060771 - 60771 C kuntzi Holo 20x
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USNM 1319910, USNPC 006772 - 6772 M grandis F voucher tail eggs 10x
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USNM 1379318, USNPC 084092 - 84092 C robustus Holo2 40x
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USNM 1393224, USNPC 098223 - 98223 O canis 20x
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USNM 1317205, USNPC 002316 - 2316 M robustus F lem3 5x
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USNM 1338268, USNPC 037587 - 37587 C conspectus Holo 40x
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USNM 1356518, USNPC 060775 - 60775 C nicaraguensis Holo 40x
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USNM 1394229, USNPC 099228 - 99228 O nickoli2 20x
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USNM 1338690, USNPC 038387 - 38087 P elegans2 20x
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USNM 1372126, USNPC 076607 - 76607 C. spinosus hi 40x
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USNM 1356519, USNPC 060776 - 60776 C crotophagicola Holo 40x
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USNM 1393215, USNPC 098214 - 98214 E macrourae2 20x
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USNM 1382980, USNPC 087780 - 87780 O major 20x
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USNM 1344336, USNPC 044769 - 44769 Pachysentis2 20x
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USNM 1390222 (USNPC 095084) L thecatus Neo lem 5x
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USNM 1356515, USNPC 060772 - 60772 C kuntzi Para2 40x
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USNM 1320666, USNPC 007911 - 7911 M grandis male deeper foc Type 10x
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USNM 1379318, USNPC 084092 - 84092 C robustus Holo 40x
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USNM 1393224, USNPC 098223 - 98223 O canis2 20x
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USNM 1317205, USNPC 002316 - 2316 M robustus F lem3a deep foc 5x
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USNM 1338268, USNPC 037587 - 37587 C conspectus Holo spines 40x
