Key to eastern US Crematogaster

AntWiki: The Ants --- Online
Revision as of 06:30, 8 September 2014 by Lubertazzi (talk | contribs) (4)
Jump to navigation Jump to search

This worker key is based on:


  • Thoracic dorsum covered with distinct, strong, vermiculate rugae; a small, dark colored, arboreal species usually found only in cypress swamps; distribution possibly co-extensive with the bald cypress in southern U.S. (type specimens mislabeled as to locality, not found in California) . . . . . Crematogaster vermiculata
  • Thoracic dorsum without vermiculate rugae, or if faintly present on front of pronotum and base of epinotum, then not found in this habitat . . . . . 2


return to couplet #1

  • Pronotum rugose on each side and with a median, smoother sulcus; when seen from the front, the high, median mesonotal carina may be seen through this sulcus almost like a gun sight; a small, dark colored, arboreal species, found nesting in live-oaks and other trees along the southern Texas gulf coast and on into Mexico. . . . . . Crematogaster rifelna


return to couplet #2

  • Epinotal spines very short and distinctly in curved; thoracic dorsum smooth to weakly punctate, a small arboreal species common throughout the southeastern states from Texas to the Carolinas . . . . . Crematogaster ashmeadi


return to couplet #3

  • Pubescence suberect on at least head and thorax; erect hairs slender and numerous on thorax and gaster . . . . . 5
  • Pubescence appressed on head, thorax, and gaster; erect hairs either rather sparse on thorax and gaster or if numerous then somewhat bristle-like in appearance. . . . . . 6


return to couplet #4

  • Pubescence suberect on head and thorax only; thorax smooth or faintly punctate; nests in large variety of semi-arboreal situations in or near swamps, salt marshes, rivers, and streams; common throughout southeastern U. S., reaching Texas, Missouri, Indiana, and New Jersey . . . . . Crematogaster clara
  • Pubescence suberect on gaster and legs as well as head and thorax; thorax usually with some distinct rugae; often nests in logs and fallen branches in marshy situations; confined to the east coast from New Jersey to Georgia . . . . . Crematogaster pilosa


return to couplet #4

  • Epinotal spines very long and with heavy bases, inclosing a smoothly parabola-like curve when seen from above; base of epinotum usually smooth or only feebly sculptured; common in peninsular Florida and in coastal salt-grass marshes to the Carolinas and Alabama; often builds large carton nests . . . . . Crematogaster atkinsoni
  • Epinotal spines of moderate length and not inclosing a smoothly parabola-like curve; base of epinotum usually distinctly sculptured; carton nests rarely or never constructed . . . . . 7