Quadrigyrus
| Quadrigyrus | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Acanthocephala |
| Class: | Eoacanthocephala |
| Order: | Gyracanthocephala |
| Family: | Quadrigyridae |
| Subfamily: | Quadrigyrinae |
| Genus: | Quadrigyrus Van Cleave, 1920 |
| Type species | |
| Quadrigyrus torquatus Van Cleave, 1920
| |
Quadrigyrus is a genus in Acanthocephala (thorny-headed worms, also known as spiny-headed worms).
Taxonomy[edit]
The genus was described by Van Cleave in 1920.
Description[edit]
Quadrigyrus species consist of a proboscis covered in hooks and a long trunk.
Species[edit]
The genus Quadrigyrus Van Cleave, 1920 contains nine species.
- Quadrigyrus brasiliensis Machado-Filho, 1941
- Quadrigyrus chinensis Mao, 1979
- Quadrigyrus guptai Gupta and Gunjan-Sinh, 1992
- Quadrigyrus machadoi Fabio, 1983
- Quadrigyrus nickoli Schmidt and Hugghins, 1973
Q. nickoli was found infesting Hoplerythrinus unitaeniatus from Colombia. It has four circular rows of between 23 and 29 trunk spines each with heavy dendritic roots. The species name nickoli is named after Dr. Brent B. Nickol, a parasitologist from the University of Nebraska.[1]
- Quadrigyrus polyspinosus Li, 1984
- Quadrigyrus rhodei Wang, 1980
- Quadrigyrus simhai Gupta and Fatma, 1986
- Quadrigyrus torquatus Van Cleave, 1920
Q. torquatus has been found infesting the intestines of Ageneiosus caucanus and Hoplias malabaricus in the Magdalena River basin in Colombia.[2] It was also found in Hoplerythrinus unitaeniatus also from Colombia.[1]
Distribution[edit]
The distribution of Quadrigyrus is determined by that of its hosts.
Hosts[edit]
The life cycle of an acanthocephalan consists of three stages beginning when an infective acanthor (development of an egg) is released from the intestines of the definitive host and then ingested by an arthropod, the intermediate host. Although the intermediate hosts of Quadrigyrus are ???. When the acanthor molts, the second stage called the acanthella begins. This stage involves penetrating the wall of the mesenteron or the intestine of the intermediate host and growing. The final stage is the infective cystacanth which is the larval or juvenile state of an Acanthocephalan, differing from the adult only in size and stage of sexual development. The cystacanths within the intermediate hosts are consumed by the definitive host, usually attaching to the walls of the intestines, and as adults they reproduce sexually in the intestines. The acanthor is passed in the feces of the definitive host and the cycle repeats. There may be paratenic hosts (hosts where parasites infest but do not undergo larval development or sexual reproduction) for Quadrigyrus.[5]
Quadrigyrus parasitizes animals. There are no reported cases of Quadrigyrus infesting humans in the English language medical literature.[4]
- Hosts for Quadrigyrus species
-
Hoplerythrinus unitaeniatus is a host of Q nickoli and Q. torquatus -
Hoplias malabaricus is a host of Q. torquatus
Notes[edit]
References[edit]
- ^ a b Schmidt, G. D., & Hugghins, E. J. (1973). Acanthocephala of South American Fishes. Part I, Eoacanthocephala. The Journal of Parasitology, 829-835.
- ^ Buckner, R. L., & Brooks, D. R. (1980). Occurrence of Quadrigyrus torquatus Van Cleave, 1920 (Acanthocephala) in north-central Colombia, South America. Proceedings of the Helminthological Society of Washington, 47(1), 139-140.
- ^ CDC’s Division of Parasitic Diseases and Malaria (11 April 2019). "Acanthocephaliasis". www.cdc.gov. Center for Disease Control. Archived from the original on 8 June 2023. Retrieved 17 July 2023.
- ^ a b Mathison, BA; et al. (2021). "Human Acanthocephaliasis: a Thorn in the Side of Parasite Diagnostics". J Clin Microbiol. 59 (11): e02691-20. doi:10.1128/JCM.02691-20. PMC 8525584. PMID 34076470.
- ^ Schmidt, G.D. (1985). "Development and life cycles". In Crompton, D.W.T.; Nickol, B.B. (eds.). Biology of the Acanthocephala (PDF). Cambridge: Cambridge Univ. Press. pp. 273–305. Archived (PDF) from the original on 22 July 2023. Retrieved 16 July 2023.