Orthomorpha coarctata

Orthomorpha coarctata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Diplopoda
Order: Polydesmida
Family: Paradoxosomatidae
Genus: Orthomorpha or Asiomorpha
Species: O. coarctata
Binomial name
Orthomorpha coarctata
(DeSaussure, 1860)
Synonyms

Polydesmus coarctatus DeSaussure, 1860
Strongylosoma poeyi Bollman, 1887
Strongylosoma coarctatum Pocock, 1894
Orthomorpha coarctata Attems, 1937
Asiomorpha coarctata Verhoeff, 1939

Orthomorpha coarctata (alternately known as Asiomorpha coarctata) is a widely introduced species of Polydesmidan millipede of the family Paradoxosomatidae. It is presumed native to Southeast Asia but due to transport by humans occurs in tropical and sub-tropical areas throughout the world, including the Hawaiian Islands, the West Indies and Gulf Coast of North America.[1][2] Males range from 14.5–20.5 mm in length and 1.5 to 2.7 mm wide while females are somewhat larger ranging from 16.5–27.5 mm long, and 1.6–3.2 mm wide.[3] O. coarctata can be distinguished from Oxidus gracilis, another widely introduced Asian millipede, by having proportionally longer and pointier paranota (lateral keels) on mid-body segments and longer gonopods (male reproductive appendages).[4]

O. coarctata is unique within the genus Orthomorpha in that the gonopods have a single, simple tip, while other species have two or three lobes. This distinction has led some authors to place O. coarctata in a separate, monotypic genus, Asiomorpha.[1][3]

Anatomy of an individual collected in Thailand 
Anatomy of male (A-I) and female (J-L) 
Gonopods 

References

  1. 1 2 Hoffman, R. L. (1999). "Checklist of the millipeds of North and Middle America". Virginia Museum of Natural History Special Publications. 8: 1–553. p. 415
  2. ↑ McCormack, Gerald (2007). "Asiomorpha coarctata, Long-flange Millipede". Cook Islands Biodiversity Database, Version 2007.2. Cook Islands Natural Heritage Trust, Rarotonga. Retrieved 20 May 2014.
  3. 1 2 Likhitrakarn, Natdanai; Golovatch, Sergei; Panha, Somsak (2011). "Revision of the Southeast Asian millipede genus Orthomorpha Bollman, 1893, with the proposal of a new genus (Diplopoda, Polydesmida, Paradoxosomatidae)". ZooKeys. 131 (131): 1–161. doi:10.3897/zookeys.131.1921. PMC 3208436Freely accessible. PMID 22140329.
  4. ↑ McCormack, Gerald (2007). "Oxidus gracilis, Short-flange Millipede". Cook Islands Biodiversity Database, Version 2007.2. Cook Islands Natural Heritage Trust, Rarotonga. Retrieved 20 May 2014.
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