Dipodomys deserti

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Dipodomys deserti Desert Kangaroo rat
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Dipodomys deserti Desert Kangaroo rat
Habitat Sonora-Mojave Creosotebush-White Bursage
Desert Scrub (Larrea tridentata and Ambrosia
dumosa) Soils Sandy
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Dipodomys microps Chisel toothed kangaroo rat
Habitat Mojave Mid-Elevation Mixed Desert Scrub
(Coleogyne ramosissima, Eriogonum fasciculatum,
Ephedra nevadensis, Yucca brevifolia, or Yucca
schidigera) Soils Gravely
Chisel-teeth
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Dipodomys microps Chisel toothed kangaroo rat
Habitat Mojave Mid-Elevation Mixed Desert Scrub
(Coleogyne ramosissima, Eriogonum fasciculatum,
Ephedra nevadensis, Yucca brevifolia, or Yucca
schidigera) Soils Gravely
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Family Heteromyidae Chaetodipus formosus
(Long-tailed Pocket Mouse) Chaetodipus
penicillatus (Desert Pocket Mouse)
Dipodomys merriami (Merriam's Kangaroo Rat)
Dipodomys microps (Chisel-toothed Kangaroo Rat)
Perognathus longimembris (Little Pocket
Mouse) Perognathus parvus (Great Basin
Pocket Mouse) Family Muridae Neotoma
lepida (Desert Woodrat) Onychomys torridus
(Southern Grasshopper Mouse) Peromyscus
eremicus (Cactus Mouse) Peromyscus crinitus
(Canyon Mouse) Peromyscus maniculatus
(Deermouse) Reithrodontomys megalotis
(Western Harvest Mouse) Family Sciuridae
Ammospermophilus leucurus (White-tailed Antelope
Squirrel) Spermophilus tereticaudus
(Round-tailed Ground Squirrel)
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Keys and Keying

• Key Construction
• Dichotomous keys are a series of parallel and
  mutually exclusive (contradictory) couplets.
• Each couplet has two parts (e.g. 1 and 1)
• Selection of Key Character
• Keys may be based on cranial features, skeletal
  features, or external soft anatomy features.
• The character selected should be valid for both
  sexes and all age classes
• The author must keep in mind the portion (s) of
  the organism that the reader of the key will
  examine.
• Key characters should be easily observable
• Characters should exhibit little individual
  variation
• Absolute conditions (such as the presence or
  absence) are the best
• Discontinuous characters (e.g. one versus two
  incisors) are useful
• Continuous characters (e.g. length of a hind
  foot) should be used only when there is no
  overlap
• Characters that call for a value judgment are
  problematic
• Ideally, each statement in the first part of a
  couplet is contradicted by a corresponding
  statement in the second part of a couplet

Dichotomous Key Activities http//www.lnhs.org/ha
yhurst/ips/dichot/ http//students.ed.qut.edu.au/n
2364379/MDB377/DichotomousKey.html http//www.dnr.
state.wi.us/org/caer/ce/eek/critter/watercritter/c
ritterindex.htm
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Infraorbital foramen on or near zygomatic
plate X Infraorbital foramen on side of rostrum,
anterior to zygomatic plate
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