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Genus Nomamyrmex Borgmeier


Eciton subg. Nomamyrmex Borgmeier, 1936:55.

Type-species:Nomamyrmex esenbecki crassicornis
      = Eciton crassicorne F. Smith, 1855; original designation.

Included names

N. esenbecki (Westwood, 1842).  United States (Texas) south to Argentina and Paraguay. (Map 40 ) Plate 51

       = Eciton crassicorne F. Smith, 1855.  NEW SYNONYMY.
       = Acanthostichus afflictus Gallardo, 1919a
       = Eciton (Labidus) fimbriatum Santschi, 1920c
       = Eciton (Labidus) esenbecki subsp. hirsutipodex Santschi, 1920c
       = Eciton (Labidus) esenbecki subsp. wilsoni Santschi, 1920c.  NEW SYNONYMY.
       = Eciton fimbriatum var. interruptum Santschi, 1923a 
       = Eciton (Holopone) crassicorne subsp. crudele Santschi, 1928a
       = Eciton (Holopone) crassicorne var. intrepidum Santschi, 1928c
       = Eciton (Holopone) crassicorne crudele var. furiosum Santschi, 1929a
       = Eciton (Holopone) fimbriatum var. terrificum Santschi, 1930a
       = Eciton (Holopone) crassicorne var. indomabile Santschi, 1930a

N. hartigi (Westwood, 1842).  Panamá to Brazil and Paraguay.  (Map 41)

       = Eciton schlechtendali Mayr, 1887
       = Eciton (Labidus) hartigi subsp. hansi Forel, 1912a
       = Eciton (Labidus) apicifer Santschi, 1916

       This genus includes only two species.  One (N. esenbecki), ranges from southern Texas, in the United States, to Argentina and has been divided into four subspecies. The second species, N. hartigi, is primarily South American, but occurs through Central America to southern México. The species were most recently reviewed by Watkins (1977).
       It is true that the morphological features on which the several subspecies of N. esenbecki are based are generally representative of their respective populations. Equally true, however, is that many specimens within these populations do not possess the required characteristics of that named population.Samples from areas of sympatry are, as may be expected, intermediate between the respective phenotypes.In the worker caste, there is a north/south trend that is continuous. In northern specimens, the posterior margin of the mesonotum, in dorsal view, is definitely concave, and the longitudinal rugules of the propodeal dorsum are short and weak. Proceeding into Central America and through South America, the margin of the mesonotum becomes straight or even convex; the propodeal rugulae strengthen and run the entire length of the dorsal face. Similar trends are evident in the male structures employed by Watkins (1977) in segregating N. esenbecki into four subspecies. In fact, differences in genitalic structures may be greater within any given population than those that separate purported subspecies.  Under the circumstances, there would appear to be little justification for these subspecies and we propose to reduce all to synonymy.

1 Preoccipital sulcus present (plate 51, fig.3 ); petiole dorsum longitudinally rugulose (Fig.00 ) esenbecki
-- Preoccipital sulcus absent (plate 52, fig. 5 ); petiole dorsum without rugulae (Fig.00 ) hartigi

1 Gastral T1 longitudinally rugulose; setae of T5 separated along midline
(plate 51, fig. 2 ); blade of stipes about 1/2 as wide as long (Fig.00 )
-- Gastral T1 arugulose; T5 setae not divided long midline (plate 52, fig. 2); blade of stipes about 2/3 as wide as long (Fig.00 ) hartigi

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Date of this version 17, February 2003
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