• Each caudal ramus with five setae, dorsal surface of female cauldal rami without hair
• Third segment from the end of the right antenna with a long straight process, which slightly tapers at the end. The process is longer than the second to last antennal segment
• Male and female, first antennae, left and right, segment 2 with three setae (and aesthetasc)
• Male and female, setae on left antennal segment 3 typically (*) not reaching segment 6, view: male / female
• Left antennal segments 14, 16 and 18 with two setae, one setae on segment 19
• View entire male 5th leg
• Terminal hook on right 5th expopod with only a slight curve
• Large species, male: 2.6 - 3.3mm; female: 3.1 - 4.0mm (1)

•  Found in high altitude lakes and ponds

• (*) The setae on the male third segment of the left antenna was somewhat elongate on the specimens we observed. Reid and Williamson (2010) report that the setae for H. shoshone should not reach segment six. Photographed specimens were collected from Trappers Lake, Colorado (elevation 2934m); all other taxonomic features were consistent with H. shoshone.

• Calanoid1.mov - a calanoid swimming (886 KB).
• Calanoid2.mov - a calanoid feeding (831 KB).

(1) Reid, J.W., and C.E. Williamson. 2010. Copepoda. In: Thorp, J.H. & A.P. Covich (Eds.). Ecology and Classification of North American Freshwater Invertebrates. 3rd Edition. Chapter 21. Academic Press, New York: 829-899.