• Each caudal ramus with five setae
• Third segment from the end on the right antenna has no appendage
• Left fifth leg shorter than the right fifth leg and reaching beyond the first segment of the right exopod
• Exopod 2 of left fifth leg about 1/3 the length of exopod 1, view at: 1000x
• Endopod of the right fifth leg longer than the first exopod of the right fifth leg
• Terminal claw of the right fifth leg not angled, but with a irregular bump in proximal third (1), view at: 1000x
• Specimen approximately 1 mm long

• Found in lakes and ponds of the northeastern states.

• Calanoid1.mov - a calanoid swimming (886 KB).
• Calanoid2.mov - a calanoid feeding (831 KB).
• S_pygmaeus_5th_leg.mov - virtual focus of the 5th leg (1.71 MB)

• Consensus Sequence
• National Center for Biotechnology Information GenBank Accession Numbers for individuals of this species
• To learn more about barcoding, click here.

(1) Skistodiaptomus pygmaeus: Information from the Great Lakes Science Center, USGS