Diplectanidae

Family of flatworms From Wikipedia, the free encyclopedia

Diplectanidae

The Diplectanidae are a family of monopisthocotylean monogeneans. They are all parasitic on the gills of fish (marine or freshwater). Diplectanids are small animals, generally around 1 mm in length. As parasites, they can be extremely numerous, up to several thousand on an individual fish.

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History

The family Diplectanidae was proposed by the Italian parasitologist Monticelli in 1903 (as subfamily Diplectaninae).[1] The status of the family and its components was later examined by various authors, including Johnston & Tiegs (1922),[2] Price (1937),[3] Bychowsky (1957),[4] Yamaguti (1963),[5] and Oliver (1987).[6]

Morphology

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Haptor of Pseudorhabdosynochus jeanloui showing a squamodisc, hooks and bars - scale: 40 μm

Diplectanids are diagnosed by the combination of these three characters:

  • Presence of accessory adhesive organs on dorsal and ventral part of the haptor, called squamodiscs when they are made up of rodlets and lamellodiscs when they include lamellae
  • In the haptor, three transversal bars (one ventral, two lateral (dorsal), connected to two pairs of hooks (one pair dorsal, one pair ventral)
  • A germarium (or ovary) which is anterior to the testis and loops around the right intestinal caecum

Genera

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Perspective

The genera recognized in WoRMS [7] are:

References

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