Heterochondria petila   Ho, Kim & Kumar,  2000 (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 2.85-3.73 µm; male 288 µm.

Female: Body elongated and cylindrical. Head longer than wide, 610 X 360 µm (not including inflated antennule), with round, lateral protrusion in front and rear; in lateral view posterior (oral) region thicker than anterior (antennal ) region. Neck region (first pediger) distinct. Trunk slightly wider in posterior region. Genital double somite wider than long, carrying egg sacs on its ventral surface. Abdomen globose. Caudal ramus a spiniform, pointed process bearing three setae and a small, medial lobe. Egg sac about as long as trunk.

Antennule fleshy, with greatly inflated basal portion; armature being 1-1-1-2-8. Antenna two-segmented; proximal segment small, with a round, distal protrusion; terminal segment a slender, uncinate hook bearing fine annuli in distal portion. Labrum with denticles on posterior margin. Mandible two-segmented; terminal blade with a row of about 80 teeth on convex (inner) side and two rows of about 40 teeth on concave (outer) side. Paragnath a small lobe with spinules on distal surface. Maxillule a spinulose lobe tipped with two small setae. Maxilla two-segmented; first segment larger but unarmed, second segment bearing in basal region one small, simple seta and a large seta with hyaline tip, and a row of more than 30 teeth on terminal process. Maxilliped three-segmented; first segment largest but unarmed, second segment expanded distally and bearing two groups of spines with terminal claw bending between them.

Male: Body with swollen cephalosome and cylindrical metasome and urosome. Genital somite with usual ventrolateral ridges but indistinguishably fused with abdomen. Caudal ramus as in female but armed with only a small, basal knob on ventral surface. Antennule absent. Antenna two-segmented; terminal segment a short, stout claw. Labrum with smooth posterior margin. Mandible with fewer teeth on terminal blade, 18 on convex side and three on concave side. Maxillule tipped with a knob and two setae. Maxilla with only three teeth on terminal process. Maxilliped generally as female except terminal teeth on second segment occurring in one patch and distal claw (third segment) with a subterminal hooklet.

Heterochondria petila can be distinguished from Heterochondria pillaii and Heterochondria similis by having:
(1) a median ratio ( length/width) for trunk (6.98 vs. 11 in Heterochondria pillaii and 3.58 in Heterochondria similis);
(2) two pairs of unequal legs;
(3) more teeth on the mandible and maxilla; and
(4) no antennule in the male.

Parasitic on the gill filaments of fishes (Pseudorhombus arsius, Pseudorhombus javanicus and Pseudorhombus triocellatus).

Synonym (s)

Common Name (s)
Economic Importance and Threats



• Kerala INDIA (Record: 11/03/1994, 20/07/1994, 12/10/1994, 26/12/1994, 29/04/1995, 12/10/1995, 25/12/1995)

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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