Heterochondria pillaii   Ho,  1970 (Copepod)
Organism information awaits expert curation
Class: Maxillopoda

Image copyrights: Taylor and Francis

A) Dorsal habitus of adult female; B) Lateral habitus of adult male

Size: Female 2.52-5.71 µm long; male 292 µm long.

Female: Body elongated and cylindrical. Head longer than wide, 910 X 482 µm (not including inflated antennule), with two lateral protrusions in front and one similar but smaller protrusion in rear. Neck region (first pediger) not marked off from trunk. Genital double somite wider than long and bearing a lateral seta in egg sac attachment area. Abdomen distinctly longer than wide. Caudal ramus a spiniform, pointed process bearing three setae and a medial knob. Egg sac lengths variable, ranging from less than one-half of to more than twice body length.

Antennule fleshy, inflated, with a subterminal, posteroventral protrusion; armature being 1-1-8. Antenna two-segmented; proximal segment small, bearing a sclerotized process at base of terminal segment, which is a slender claw with corrugated surface in the distal third. Labrum with denticles on posterior margin. Mandible two-segmented; terminal blade with a row of 22 to 26 teeth on convex (inner) side and two rows of about 25 teeth on concave (outer) side. Maxillule a small fleshy lobe tipped with two short setae and a patch of spinules. Maxilla two-segmented; first segment large but unarmed, second segment bearing in basal region one small, simple seta and one large seta with hyaline tip, and a row of about 30 teeth on terminal process. Maxilliped three-segmented; first segment largest but unarmed, second segment expanded distally and bearing two rows of spines with terminal claw bending between them. Both legs constructed on same plan with a long outer seta, a patch of spinules on distal surface, a small terminal seta, and a small nipple-like bud on medial surface.

Male: Body with swollen cephalosome and cylindrical metasome and urosome. Genital somite with usual ventrolateral ridges and indistinguishably fused with abdomen. Caudal ramus as in female but naked.
Antennule reduced to a small rod tipped with few setae. Antenna two-segmented; terminal segment a short, stout claw. Labrum roughly as in female. Mandible with fewer teeth on terminal blade, 15 on convex side and six on concave side. Paragnath a small, spinulose lobe. Maxillule as in female but lacking spinules. Maxilla with seven teeth on terminal process. Maxilliped generally as female except terminal teeth on second segment occurring in two patches rather than in two rows.

Parasitic on gill filaments of fishes (Pseudorhombus triocellatus, Pseudorhombus elevates, Pseudorhombus arsius, Pseudorhombus javanicus, Cynoglossus dubius, Cynoglossus lida).

Synonym (s)

Common Name (s)
Economic Importance and Threats



• Kerala INDIA (Record: 14/02/1994, 29/07/1994, 12/10/1994, 26/12/1994, 29/04/1995)

Literature Source(s)
  • Ho, JS; Kim, IH and Kumar, AB (2000) Chondracanthid copepods parasitic on flatfishes of Kerala, India Journal Of Natural History Taylor and Francis 34(5) 709-735 Available at - http://dx.doi.org/10.1080/002229300299372
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org

Page last updated on:2010-07-08

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