Difference between revisions of "Key to Dorymyrmex of SE United States workers"

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*Promesonotal profile convex; base of propodeum at an angle of 145° or less to the plane of the posterior portion of the mesonotum (Figs. 9, 11), scape exceeding occipital margin by 113, or less, its length in frontal view (Figs. 2, 4); color variable <span style="background:#F5F5F5">[[#3|'''. . . . . 3''']]</span>
 
*Promesonotal profile convex; base of propodeum at an angle of 145° or less to the plane of the posterior portion of the mesonotum (Figs. 9, 11), scape exceeding occipital margin by 113, or less, its length in frontal view (Figs. 2, 4); color variable <span style="background:#F5F5F5">[[#3|'''. . . . . 3''']]</span>
  
*Thorax elongate, with promesonotal profile flattened and upward slope of base of prop ode urn at an angle of 165°, or more, to the plane of the mesonotal dorsum (Fig. 10); scape exceeding occipital margin by almost 112 its length (Fig. 3); color clear, weakly shining yellow, with at most a trace of darkening near gastric apex; a slender, long-legged form known only from the scrub and xeric woodlands of Highlands Co., Florida . . . . . ''[[Dorymyrmex elegans]]''  
+
*Thorax elongate, with promesonotal profile flattened and upward slope of base of prop ode urn at an angle of 165°, or more, to the plane of the mesonotal dorsum (Fig. 10); scape exceeding occipital margin by almost 112 its length (Fig. 3); color clear, weakly shining yellow, with at most a trace of darkening near gastric apex; a slender, long-legged form known only from the scrub and xeric woodlands of Highlands Co., Florida . . . . . ''[[Dorymyrmex elegans]]''
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{|
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|[[File:Dorymyrmex elegans casent0003314 head 1.jpg|thumb|220px|]]
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|[[File:Dorymyrmex elegans casent0003314 profile 1.jpg|thumb|220px|]]
 +
|}
  
 
==3==
 
==3==
 
return to [[#2 |couplet #2]]
 
return to [[#2 |couplet #2]]
 
*Head broad (Cl>87, less in minim workers); scape relatively short (SI <112); propodeal cone blunt, its posterior face straight or slightly convex (Fig. 9); color usually predominantly yellow, but if head and gaster extensively infuscated, thoracic dorsum also with at least faint brownish blotching; a common species in disturbed habitats, usually with sandy soils, from Mississippi to Maryland, especially abundant in Florida . . . . . ''[[Dorymyrmex bureni]]''  
 
*Head broad (Cl>87, less in minim workers); scape relatively short (SI <112); propodeal cone blunt, its posterior face straight or slightly convex (Fig. 9); color usually predominantly yellow, but if head and gaster extensively infuscated, thoracic dorsum also with at least faint brownish blotching; a common species in disturbed habitats, usually with sandy soils, from Mississippi to Maryland, especially abundant in Florida . . . . . ''[[Dorymyrmex bureni]]''  
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{|
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|[[File:Dorymyrmex bureni casent0103863 head 1.jpg|thumb|170px|]]
 +
|[[File:Dorymyrmex bureni casent0103863 profile 1.jpg|thumb|225px|]]
 +
|}
  
*Head narrower (Cl <87); scape longer (Sl> 112, as low as 109 in about 5% of workers); propodeal cone sharper, appearing faintly recurved because posterior face of prop ode urn slightly concave (Fig. 11); head dark brown, thorax clear yellow (never with faint, dorsal blotching), gaster dull brown; a locally abundant species in sand pine scrubland of central Florida . . . . . ''[[Dorymyrmex flavopectus]]''  
+
*Head narrower (Cl <87); scape longer (Sl> 112, as low as 109 in about 5% of workers); propodeal cone sharper, appearing faintly recurved because posterior face of prop ode urn slightly concave (Fig. 11); head dark brown, thorax clear yellow (never with faint, dorsal blotching), gaster dull brown; a locally abundant species in sand pine scrubland of central Florida . . . . . ''[[Dorymyrmex flavopectus]]''
 +
{|
 +
|[[File:Dorymyrmex flavopectus casent0103887 head 1.jpg|thumb|210px|]]
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|[[File:Dorymyrmex flavopectus casent0103887 profile 1.jpg|thumb|260px|]]
 +
|}
  
 
==4==
 
==4==
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*Gaster densely pubescent, pubescence closely spaced and at least partly obscuring sheen of gastric dorsum; angle between dorsal and declivous mesonotal faces broadly obtuse (e~1400); mesonotal declevity not unusually steep (Fig. 12, 14) <span style="background:#F5F5F5">[[#5|'''. . . . . 5''']]</span>
 
*Gaster densely pubescent, pubescence closely spaced and at least partly obscuring sheen of gastric dorsum; angle between dorsal and declivous mesonotal faces broadly obtuse (e~1400); mesonotal declevity not unusually steep (Fig. 12, 14) <span style="background:#F5F5F5">[[#5|'''. . . . . 5''']]</span>
  
*Gaster lacking pubescence, or at most with a few widely spaced, fine setae which do not obscure the sheen of the gastric dorsum; mesonotum more acutely angular, angle between dorsal and declivous mesonotal faces 90°-120°, mesonotal declivity steep (Fig. 8); a common but inconspicuous species of turkey oak savannas and oak scrubland in Florida and adjacent Georgia . . . . . ''[[Dorymyrmex bossutus]]''  
+
*Gaster lacking pubescence, or at most with a few widely spaced, fine setae which do not obscure the sheen of the gastric dorsum; mesonotum more acutely angular, angle between dorsal and declivous mesonotal faces 90°-120°, mesonotal declivity steep (Fig. 8); a common but inconspicuous species of turkey oak savannas and oak scrubland in Florida and adjacent Georgia . . . . . ''[[Dorymyrmex bossutus]]''
 +
{|
 +
|[[File:Dorymyrmex bossutus casent0103858 head 1.jpg|thumb|210px|]]
 +
|[[File:Dorymyrmex bossutus casent0103858 profile 1.jpg|thumb|240px|]]
 +
|}
  
 
==5==
 
==5==
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*Head broad (CI>90); occipital border normally distinctly concave; propodeal cone large and prominent (Fig. 13, 14); larger species (HTL> 1.95) <span style="background:#F5F5F5">[[#6|'''. . . . . 6''']]</span>
 
*Head broad (CI>90); occipital border normally distinctly concave; propodeal cone large and prominent (Fig. 13, 14); larger species (HTL> 1.95) <span style="background:#F5F5F5">[[#6|'''. . . . . 6''']]</span>
  
*Head narrower (CI <88, rarely up to 90); occipital border weakly convex or straight; propodeal cone low and not as prominent (compare Figs. 12 and 13); smaller species (HTL<1.95); a species of openings in well-drained pine-oak woodland from northern Florida to New Jersey . . . . . ''[[Dorymyrmex grandulus]]''  
+
*Head narrower (CI <88, rarely up to 90); occipital border weakly convex or straight; propodeal cone low and not as prominent (compare Figs. 12 and 13); smaller species (HTL<1.95); a species of openings in well-drained pine-oak woodland from northern Florida to New Jersey . . . . . ''[[Dorymyrmex grandulus]]''
 +
{|
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|[[File:Dorymyrmex grandulus casent0103878 head 1.jpg|thumb|200px|]]
 +
|[[File:Dorymyrmex grandulus casent0103878 profile 1.jpg|thumb|210px|]]
 +
|}
  
 
==6==
 
==6==
 
return to [[#5 |couplet #5]]
 
return to [[#5 |couplet #5]]
 
*Scape relatively long (SI 98-111, but> 101 in 80% of workers measured); pubescence dense but very short, absent on sides of head; sides of head very shiny; front of head and dorsum of thorax only slightly dulled by pubescence; head and thorax, and often base of first tergite reddish; gaster dark brown; found within or near populations of D. bureni or D. bossuta; colonies small, inhabiting one or a few nests; queen small, HTL < 3 mm . . . . . ''[[Dorymyrmex reginicula]]''
 
*Scape relatively long (SI 98-111, but> 101 in 80% of workers measured); pubescence dense but very short, absent on sides of head; sides of head very shiny; front of head and dorsum of thorax only slightly dulled by pubescence; head and thorax, and often base of first tergite reddish; gaster dark brown; found within or near populations of D. bureni or D. bossuta; colonies small, inhabiting one or a few nests; queen small, HTL < 3 mm . . . . . ''[[Dorymyrmex reginicula]]''
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{|
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|[[File:Dorymyrmex reginicula casent0103900 h 1 high.jpg|thumb|180px|]]
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|[[File:Dorymyrmex reginicula casent0103900 p 1 high.jpg|thumb|240px|]]
 +
|}
  
 
*Scape short (SI 95-105, but <101 in over 80% of workers measured); pubescence dense, dulling front of head and thoracic dorsum; uniform brown to black; also found within or near populations of D. bureni in the Southeast, sometimes in huge polycalic colonies; queens larger, HTL > 3.25 mm . . . . . ''Dorymyrmex medeis'' (=''[[Dorymyrmex smithi]]''  
 
*Scape short (SI 95-105, but <101 in over 80% of workers measured); pubescence dense, dulling front of head and thoracic dorsum; uniform brown to black; also found within or near populations of D. bureni in the Southeast, sometimes in huge polycalic colonies; queens larger, HTL > 3.25 mm . . . . . ''Dorymyrmex medeis'' (=''[[Dorymyrmex smithi]]''  
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{|
 +
|[[File:Dorymyrmex smithi casent0103442 head 1.jpg|thumb|160px|]]
 +
|[[File:Dorymyrmex smithi casent0103442 profile 1.jpg|thumb|240px|]]
 +
|}
  
 
[[Category:Identification key|Dorymyrmex]][[Category:Dorymyrmex]]
 
[[Category:Identification key|Dorymyrmex]][[Category:Dorymyrmex]]

Latest revision as of 23:33, 15 August 2019

This worker key is based on: Trager, J. C. 1988a. A revision of Conomyrma (Hymenoptera: Formicidae) from the southeastern United States, especially Florida, with keys to the species. Florida Entomologist. 71:11-29. PDF

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1

Figures 8-14. Lateral view of thoraces of worker Dorymyrmex: 8) D. bossuta, 9) D. bureni, 10) D. elegans, 11) D. jZavopecta, 12) D. grandula, 13) D. medeis, 14) D. reginicula.
  • Mesonotal profile, in all or the great majority of workers of a series, either evenly convex (Figs. 9, 11), or flat to weakly concave (Fig. 10) . . . . . 2
  • Mesonotal profile, in all or the great majority of workers of a series, angular, having distinct dorsal and declivous faces (Figs. 8, 12-14) . . . . . 4

2

return to couplet #1

  • Promesonotal profile convex; base of propodeum at an angle of 145° or less to the plane of the posterior portion of the mesonotum (Figs. 9, 11), scape exceeding occipital margin by 113, or less, its length in frontal view (Figs. 2, 4); color variable . . . . . 3
  • Thorax elongate, with promesonotal profile flattened and upward slope of base of prop ode urn at an angle of 165°, or more, to the plane of the mesonotal dorsum (Fig. 10); scape exceeding occipital margin by almost 112 its length (Fig. 3); color clear, weakly shining yellow, with at most a trace of darkening near gastric apex; a slender, long-legged form known only from the scrub and xeric woodlands of Highlands Co., Florida . . . . . Dorymyrmex elegans
Dorymyrmex elegans casent0003314 head 1.jpg
Dorymyrmex elegans casent0003314 profile 1.jpg

3

return to couplet #2

  • Head broad (Cl>87, less in minim workers); scape relatively short (SI <112); propodeal cone blunt, its posterior face straight or slightly convex (Fig. 9); color usually predominantly yellow, but if head and gaster extensively infuscated, thoracic dorsum also with at least faint brownish blotching; a common species in disturbed habitats, usually with sandy soils, from Mississippi to Maryland, especially abundant in Florida . . . . . Dorymyrmex bureni
Dorymyrmex bureni casent0103863 head 1.jpg
Dorymyrmex bureni casent0103863 profile 1.jpg
  • Head narrower (Cl <87); scape longer (Sl> 112, as low as 109 in about 5% of workers); propodeal cone sharper, appearing faintly recurved because posterior face of prop ode urn slightly concave (Fig. 11); head dark brown, thorax clear yellow (never with faint, dorsal blotching), gaster dull brown; a locally abundant species in sand pine scrubland of central Florida . . . . . Dorymyrmex flavopectus
Dorymyrmex flavopectus casent0103887 head 1.jpg
Dorymyrmex flavopectus casent0103887 profile 1.jpg

4

return to couplet #1

  • Gaster densely pubescent, pubescence closely spaced and at least partly obscuring sheen of gastric dorsum; angle between dorsal and declivous mesonotal faces broadly obtuse (e~1400); mesonotal declevity not unusually steep (Fig. 12, 14) . . . . . 5
  • Gaster lacking pubescence, or at most with a few widely spaced, fine setae which do not obscure the sheen of the gastric dorsum; mesonotum more acutely angular, angle between dorsal and declivous mesonotal faces 90°-120°, mesonotal declivity steep (Fig. 8); a common but inconspicuous species of turkey oak savannas and oak scrubland in Florida and adjacent Georgia . . . . . Dorymyrmex bossutus
Dorymyrmex bossutus casent0103858 head 1.jpg
Dorymyrmex bossutus casent0103858 profile 1.jpg

5

return to couplet #4

  • Head broad (CI>90); occipital border normally distinctly concave; propodeal cone large and prominent (Fig. 13, 14); larger species (HTL> 1.95) . . . . . 6
  • Head narrower (CI <88, rarely up to 90); occipital border weakly convex or straight; propodeal cone low and not as prominent (compare Figs. 12 and 13); smaller species (HTL<1.95); a species of openings in well-drained pine-oak woodland from northern Florida to New Jersey . . . . . Dorymyrmex grandulus
Dorymyrmex grandulus casent0103878 head 1.jpg
Dorymyrmex grandulus casent0103878 profile 1.jpg

6

return to couplet #5

  • Scape relatively long (SI 98-111, but> 101 in 80% of workers measured); pubescence dense but very short, absent on sides of head; sides of head very shiny; front of head and dorsum of thorax only slightly dulled by pubescence; head and thorax, and often base of first tergite reddish; gaster dark brown; found within or near populations of D. bureni or D. bossuta; colonies small, inhabiting one or a few nests; queen small, HTL < 3 mm . . . . . Dorymyrmex reginicula
Dorymyrmex reginicula casent0103900 h 1 high.jpg
Dorymyrmex reginicula casent0103900 p 1 high.jpg
  • Scape short (SI 95-105, but <101 in over 80% of workers measured); pubescence dense, dulling front of head and thoracic dorsum; uniform brown to black; also found within or near populations of D. bureni in the Southeast, sometimes in huge polycalic colonies; queens larger, HTL > 3.25 mm . . . . . Dorymyrmex medeis (=Dorymyrmex smithi
Dorymyrmex smithi casent0103442 head 1.jpg
Dorymyrmex smithi casent0103442 profile 1.jpg