Arhynchobdellida

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Arhynchobdellida, the proboscisless leeches, are a monophyletic order of leeches. They are defined by the lack of the protrusible proboscis that defines their sister taxon, the Rhynchobdellida.[1][2][3] Arhynchobdellida is a diverse order, compromising both aquatic and terrestrial, besides sanguivorous and predatory, leeches.[3] The order is divided into two suborders, Erpobdelliformes and Hirudiniformes (sometimes also called the Pharyngobdelliformes and Gnathobdelliformes, respectively).[1]

Proboscisless leeches
A giant Americobdella species from southern Chile.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Annelida
Clade: Pleistoannelida
Clade: Sedentaria
Class: Clitellata
Subclass: Hirudinea
Infraclass: Euhirudinea
Order: Arhynchobdellida
Blanchard, 1894
Suborders

Erpobdelliformes
Hirudiniformes
and see text

Synonyms

Arhynchobdellae Stuart, 1982[verification needed]
Pharyngobdellae
Pharyngobdellida Johnson, 1913

Taxonomy

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Historically, the Arhynchobdellida were split into two orders, the Gnathobdellida and the Pharyngobdellida.[4] The Gnathobdellida were jawed and carnivorous or parasitic while the Pharyngobdellida were jawless and carnivorous.[5][6] Current taxonomy accepts the order Arhynchobdellida and divides into two suborders. There are 215 species of Arhynchobdellid leech, in 47 genera and 13 families.[7] The placement of Americobdellidae is uncertain; it has rudimentary jaws and is terrestrial.

 
Erpobdella octoculata (Erpobdelliformes:Erpobdellidae)

Erpobdelliformes

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Erpobdelliformes are jawless predators of aquatic invertebrates of varying sizes, including insect larvae, mollusks, and other annelids.[8][9] Unlike other leeches, they do not penetrate the skin of hosts; and are not at all parasitic.[10][11] The pharynx is spirally twisted and very large to allow for large prey; it can constitute up to one third of the leech's body length.[1]

 
Haemipsida zeylanica japonica (Hirudiniformes:Haemipsidae)

Hirudiniformes

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Hirudiniformes are a diverse suborder defined by the presence of toothed jaws.[1][11]

Cladogram

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Hirudinea
Arhynchobdellida
Erpobdelliformes

Americobdellidae ?
Terrestrial, jawed*, carnivorous

Erpobdellidae
Aquatic, jawless, carnivorous

Salifidae
Aquatic, jawless, carnivorous

Hirudiniformes


Americobdellidae ?
Terrestrial, jawed*, carnivorous

Cylicobdellidae
Terrestrial, jawed, carnivorous

Haemadipsidae
Terrestrial, jawed, almost all sanguivorous

Haemopidae
Semi-aquatic, jawed, sanguivorous

Hirudinidae
Terrestrial, jawed, carnivorous

Macrobdellidae

Praobdellidae
Aquatic, jawed, sanguivorous

Semiscolecidae

Xerobdellidae
Terrestrial, jawed, sanguivorous

Rhynchobdellida

Source:[12]

References

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  1. ^ a b c d Ax, Peter (2000), Ax, Peter (ed.), "Rhynchobdellida — Arhynchobdellida", Multicellular Animals: The Phylogenetic System of the Metazoa. Volume II, Berlin, Heidelberg: Springer, pp. 72–76, doi:10.1007/978-3-662-10396-8_18, ISBN 978-3-662-10396-8, retrieved 2022-12-31
  2. ^ Ecology, Environment and Conservation. EM International, Publishers of Quality International Journals. doi:10.53550/eec.
  3. ^ a b Uttam, Suneha, and Seema Langer. "Distribution and Identification key for species of freshwater leech genus Erpobdella Blainville, 1818 (Hirudinida: Arhynchobdellida: Erpobdelliformes: Erpobdellidae)."
  4. ^ "PAR volume 94 issue 1 Cover and Back matter". Parasitology. 94 (1): b1–b3. Feb 1987. doi:10.1017/S0031182000053385. ISSN 1469-8161.
  5. ^ "Pharyngobdellida | Encyclopedia.com". www.encyclopedia.com. Retrieved 2023-01-01.
  6. ^ "Gnathobdellida | Encyclopedia.com". www.encyclopedia.com. Retrieved 2023-01-01.
  7. ^ "Proboscisless leeches - Encyclopedia of Life". www.eol.org. Retrieved 2023-01-01.
  8. ^ Kwak, Hee-Jin; Kim, Jung-Hyeuk; Kim, Joo-Young; Jeon, Donggu; Lee, Doo-Hyung; Yoo, Shinja; Kim, Jung; Eyun, Seong-il; Park, Soon Cheol; Cho, Sung-Jin (2021-05-25). "Behavioral variation according to feeding organ diversification in glossiphoniid leeches (Phylum: Annelida)". Scientific Reports. 11 (1): 10940. doi:10.1038/s41598-021-90421-1. ISSN 2045-2322. PMC 8149456. PMID 34035418. S2CID 235199192.
  9. ^ "Phylogeny and Revision of Erpobdelliformes (Annelida, Arhynchobdellida) from Mexico Based on Nuclear and Mithochondrial Gene Sequences". Docslib. Retrieved 2022-12-31.
  10. ^ Kutschera, U. "Description of a new leech species, Erpobdella wuttkei nov. sp.(Hirudinea: Erpobdellidae)."
  11. ^ a b Borda, Elizabeth; Siddall, Mark E (Jan 2004). "Arhynchobdellida (Annelida: Oligochaeta: Hirudinida): phylogenetic relationships and evolution". Molecular Phylogenetics and Evolution. 30 (1): 213–225. doi:10.1016/j.ympev.2003.09.002. ISSN 1055-7903. PMID 15022771.
  12. ^ Borda, Elizabeth; Sidall, Mark (2004-12-30). "Review of the evolution of life history strategies and phylogeny of the Hirudinida (Annelida: Oligochaeta)". Lauterbornia. 52: 7–15 – via ResearchGate.