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Hesperodiaptomus shoshone
Hesperodiaptomus shoshone
Male 5th leg Hesperodiaptomus shoshone Female Hesperodiaptomus shoshone
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae
Distinguishing Characteristics
  • 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
Taxonomic Notes
  • (*) 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.
Additional Pictures
Hesperodiaptomus shoshone right antenna   Male 5th leg Hesperodiaptomus shoshone   Female Hesperodiaptomus shoshone
Hesperodiaptomus shoshone   Hesperodiaptomus shoshone   Female Hesperodiaptomus shoshone
Male Hesperodiaptomus shoshone antennae   Female 5th leg Hesperodiaptomus shoshone   Female Hesperodiaptomus shoshone
Quicktime Movies

(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.