The eggs ofvary in length from 130 to 150 micrometers and vary in width from 60 to 90 micrometers.
The life cycle ofbegins when unembryonated eggs are released from the mammal host through the feces. An adult produces up to 26,000 eggs daily. To continue development, the eggs must reach fresh water. Once these eggs are released into water, they become embryonated and take up to 7 weeks to hatch at temperatures of 27 to 32 degrees Celsius.
The embryonated eggs release miracidia which invade snails and use them as an intermediate host. In the snail, the parasite undergoes several developmental stages, from miracidia to sporocyst to rediae to cercariae. The cercariae are released from the snail back into the aquatic environment. This is fatal to the snail host. The cercariae then encyst on aquatic plants (such as water chestnut, water caltrop, lotus, and bamboo) as metacercariae.
Mammalian hosts (humans and pigs) become infected when they ingest the plants that contain the parasite's metacercariae. Once ingested, the metacercariae excyst in the duodenum and attach to the intestinal wall. After 3 months, the parasites develop into adults and begin producing eggs. ("DPDx - Fasciolopsis", 2009; Mas-Coma, et al., 2005; Raymondo, 1999)
There is no set time of the year that reproduction occurs. Oncehas matured in its definitive host, it produces eggs for the remainder of its life. can either self-fertilize or cross-fertilize.
For a great part of its lifecycle, there is no communication or movement. Once leaving a snail host,encysts on aquatic vegetation until it is consumed by the definitive host.
However, perception is important in locating a snail host. When placed near susceptible snail hosts, the miracidia rapidly locate and penetrate the host, but the mechanism of recognition is unknown. Upon leaving the host, the cercariae swim freely before finding and encysting on aquatic plants. (Graczyk, et al., 2000; Nakagawa, 1922)
There are no known predators to. It needs to be ingested by mammalian hosts in order to mature to its adult stage, and no information was found about predators in other stages of development.
is parasitic, using snails as an intermediate host to undergo development (this is fatal to the snail). This parasite reaches adulthood and produces eggs in mammal hosts, usually humans and pigs, but also equines, bovines, caprines, and ovines. can make its hosts very sick, and is very problematic in developing countries.
Segmentina hemisphaerula and Segmentina trochoideus. Plants identified to be important in transmission include water morning glory, Ipomoea aquatica; water caltrop Trapa bicornis; lotus, Nymphaea lotus; water cress, Neptunia oleracea; and water hyacinth, Eichhornia speciosa. ("DPDx - Fasciolopsis", 2009; Le, et al., 2004; Manning and Ratanarat, 1970)snail hosts that have been identified in Thailand include
There was no information of any benefits thatprovides to humans. It is possible that further research may reveal ways that could be beneficial.
There is no information about conservation efforts concerning, and does not seem to be in danger of disappearing.
is unique because it is the only member of its family (Fasciolidae) to invade the small intestine. Other members of Fascioloidae invade the liver of their host.
Lindsey Greiner (author), University of Michigan-Ann Arbor, Heidi Liere (editor), University of Michigan-Ann Arbor, John Marino (editor), University of Michigan-Ann Arbor, Barry OConnor (editor), University of Michigan-Ann Arbor, Renee Mulcrone (editor), Special Projects.
living in landscapes dominated by human agriculture.
reproduction that is not sexual; that is, reproduction that does not include recombining the genotypes of two parents
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
an animal that mainly eats meat
an animal which directly causes disease in humans. For example, diseases caused by infection of filarial nematodes (elephantiasis and river blindness).
uses smells or other chemicals to communicate
a period of time when growth or development is suspended in insects and other invertebrates, it can usually only be ended the appropriate environmental stimulus.
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
union of egg and spermatozoan
mainly lives in water that is not salty.
having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature.
fertilization takes place within the female's body
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
marshes are wetland areas often dominated by grasses and reeds.
A large change in the shape or structure of an animal that happens as the animal grows. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms. Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis.
having the capacity to move from one place to another.
the area in which the animal is naturally found, the region in which it is endemic.
found in the oriental region of the world. In other words, India and southeast Asia.
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
an organism that obtains nutrients from other organisms in a harmful way that doesn't cause immediate death
an animal that mainly eats blood
remains in the same area
non-motile; permanently attached at the base.
Attached to substratum and moving little or not at all. Synapomorphy of the Anthozoa
reproduction that includes combining the genetic contribution of two individuals, a male and a female
a wetland area that may be permanently or intermittently covered in water, often dominated by woody vegetation.
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.
breeding takes place throughout the year
CDC. 2009. "DPDx - Fasciolopsis" (On-line). Laboratory Identification of Parasites of Public Health Concern. Accessed March 24, 2011 at http://www.dpd.cdc.gov/dpdx/HTML/Fasciolopsiasis.htm.
Graczyk, T., K. Alam, R. Gilman, G. Mondal, S. Ali. 2000. Development of Fasciolopsis buski (Trematoda: Fasciolidae) in Hippeutis umbilicalis and Segmentina trochoideus (Gastropoda: Pulmonata). Parasitology Research, 86/4: 324-326.
Le, T., V. Nguyen, B. Phan, D. Blair, D. McManus. 2004. Case report: unusual presentation of Fasciolopsis buski in a Viet Namese child. Transactions of the Royal Society of Tropical Medicine and Hygiene, 98/3: 193-194.
Liu, L., K. Harhasuta. 1996. Liver and intestinal flukes. Gastrenterology Clinics of North America, 25/3: 627-636.
Manning, G., C. Ratanarat. 1970. Fasciolopsis buski (Lankester, 1857) in Thailand. Am. J. Trop. Med. Hyg., 19 (4): 613-619. Accessed March 25, 2011 at http://www.ajtmh.org/cgi/content/abstract/19/4/613.
Mas-Coma, S., M. Bargues, M. Valero. 2005. Fascioliasis and other plant-borne trematode zoonoses. International Journal for Parasitology, 35/11-12: 1255-1278.
Nakagawa, K. 1922. The development of Fasciolopsis buski Lankester. The Journal of Parasitology, 8/4: 161-166. Accessed March 26, 2011 at http://www.jstor.org/stable/3271232?seq=1.
Raymondo, D. 1999. "Parasitology Training Manual - Fasciolopsis buski" (On-line). Fasciolopsis buski. Accessed March 24, 2011 at http://www.practicalscience.com/fb.html.