The geographic range of (Lanfredi, et al., 1998)is yet to be specifically identified. It is most frequently found in neotropical areas, with the greatest frequency in South America.
- Habitat Regions
As a nematode, is cylindrical, has a cuticle with three main outer layers made of collagen and other compounds. The outer layers are non-cellular and are secreted by the epidermis. The cuticle layer protects the nematodes so they can invade the digestive tracts of animals.
Nematodes have longitudinal muscles along the body wall. The muscles are obliquely arranged in bands. Dorsal, ventral and longitudinal nerve cords are connected to the main body of the muscle.
is stout with tapered extremities. Males are smaller (6 mm) than the females (15 mm). The anterior end of both is domed shaped. This is formed by three wide lips that are separated from the rest of the body by a deep groove. The three lips center around the oral opening. There is a dorsal lip that has two sub-dorsal papilla, and a sub-ventral lip that has one ventral papillae. Near the anterior end resides the excretory pore, interrupting the cuticular striations.
Females have a long straight tail with the anus at the posterior end. The vulvar opening is located near the middle of the body. The posterior end of the males is ventrally curved. There are 22-28 pairs of preocloacal papillae which are sessile, button-like, and arranged in two lateroventral rows.
As a nematode in the group Secernentea, has a specialized tubular excretory system with three canals. The canals are arranged to form an “H”. (Barnes, 1987; Lanfredi, et al., 1998; Roberts and Janovy, 2000)
- Sexual Dimorphism
- female larger
- sexes shaped differently
- Range length
- 6 to 15 mm
- 0.24 to 0.59 in
This species is dioceious, but exact mating behavior is still unknown. Females may produce a phermomone to attract males. The male coils around a female with his curved area over the female genital pore. The gubernaculum, made of cuticle tissue, guides spicules which extend through the cloaca and anus. Males use spicules to hold the female during copulation. Nematode sperm are amoeboid-like and lack flagella. (Barnes, 1987; Roberts and Janovy, 2000)
- Parental Investment
Nematodes such as can swim intermittently. The worms are usually only able to move effectively when the pseudocoel is filled with fluid and hypertonic to to the surrounding media. (Barnes, 1987; Roberts and Janovy, 2000)
Communication and Perception
Nematodes in general have papillae, setae and amphids as the main sense organs. Setae detect motion (mechanoreceptors), while amphids detect chemicals (chemoreceptors). (Barnes, 1987; Roberts and Janovy, 2000)
- Other Communication Modes
Adults are found in the upper digestive tract of the host, particularly in the crypts of the tonsils and the pharyngeal region.burrows into the mucosal lining and there resides, eventually forming abscesses in the host. Other biology concerning food habits is still unknown.
In general, nematode pharyngeal glands and intestinal epithelium produce digestive enzymes to feed on the hosts’ body fluids. Extracellular digestion begins within the lumen and is finished intracellularly. (Barnes, 1987; Roberts and Janovy, 2000; Sprent, 1971)
- Primary Diet
- eats body fluids
- Animal Foods
- body fluids
Predators are unknown. These parasites are probably not preyed on directly, but are ingested from host to host. Larval mortality is high as most of the parasites do not reach appropriate hosts.
There is little host specficity. Normally it is found in various cat species in South America, but can also parasitize humans, domestic and wild animals. However, the mode of host infection and the natural host remain yet unknown.
- Ecosystem Impact
Economic Importance for Humans: Negative
In humans, (Sprent, 1971)will form abscesses that will contian its offspring. These abscesses can be found in the ear, neck, jaw, orbit, mastoid process, and retropharyngeal tissues. These infections can kill quickly or last years. There have only been eight documented cases.
Renee Sherman Mulcrone (editor).
Jennifer Newberry (author), University of Michigan-Ann Arbor, Teresa Friedrich (editor), University of Michigan-Ann Arbor.
living in the southern part of the New World. In other words, Central and South America.
- bilateral symmetry
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
- causes disease in humans
an animal which directly causes disease in humans. For example, diseases caused by infection of filarial nematodes (elephantiasis and river blindness).
- causes or carries domestic animal disease
either directly causes, or indirectly transmits, a disease to a domestic animal
uses smells or other chemicals to communicate
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
union of egg and spermatozoan
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
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.
- internal fertilization
fertilization takes place within the female's body
having the capacity to move from one place to another.
- native range
the area in which the animal is naturally found, the region in which it is endemic.
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
chemicals released into air or water that are detected by and responded to by other animals of the same species
rainforests, both temperate and tropical, are dominated by trees often forming a closed canopy with little light reaching the ground. Epiphytes and climbing plants are also abundant. Precipitation is typically not limiting, but may be somewhat seasonal.
- scrub forest
scrub forests develop in areas that experience dry seasons.
remains in the same area
reproduction that includes combining the genetic contribution of two individuals, a male and a female
uses touch to communicate
the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.
ARFAA, F. 2002. "CHAPTER 4: NEMATODES" (On-line). MEDICAL HELMINTHOLOGY. Accessed September 27, 2004 at http://mywebpages.comcast.net/fredarfaa/nematweb.htm#lagochil.
Barnes, R. 1987. Invertebrate Zoology. Orlando, Florida: Dryden Press.
Lanfredi, R., H. Neto, D. Gomes. 1998. Scanning Electron Microscopy of Lagochilascaris minor Leiper, 1909 (Nematoda: Ascarididae). Memorias do Instituto Oswaldo Cruz, 93(3): 327-330.
Machado, P., C. de Oliverira Jayrson Araujo. 1999. Wild Rodents as Experimental Intermediate Hosts Lagochilascaris minor Leiper, 1909. Memorias do Instituto Oswaldo Cruz, 94 (4): 441-449.
Roberts, L., J. Janovy. 2000. Foundations of Parasitology, 6th Edition. USA: The McGraw-Hill Companies, Inc..
Sprent, J. 1971. Speciation and Development in the Genus Lagochilascaris. Parasitology, 62: 71-112.
Volcan, G., C. Medran, G. Payares. 1992. Experimental Heterozenious Cycle of Lagochilascaris minor Leiper, 1909 (Nematoda: Ascarididae) in White Mice and Cats. Memorias do Instituto Oswaldo Cruz, 87: 525-532.