Cyphomyrmex longiscapus

Kempf, W. W., 1966, A revision of the Neotropical fungus-growing ants of the genus Cyphomyrmex Mayr. Part II. Group of rimosus (Spinola) (Hym. Formicidae)., Studia Entomologica (N. S.) 8, pp. 161-200: 161-165

publication ID

4580

persistent identifier

http://treatment.plazi.org/id/96B4D64D-946E-A71E-95B9-827981C5CC01

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Christiana

scientific name

Cyphomyrmex longiscapus
status

 

Group of Cyphomyrmex rimosus

The rimosus-group has previously (Kempf, 1962: 30; 1964: 4) been defined by the ensemble of the following characters in the worker (and female) caste: Mandibles with 5 teeth only; two or no midpronotal tubercles present; preocular carina either curving mesad above eyes (most species of the group) or fading out above eyes, yet with the postero-lateral border of the antennal scrobe more or less defined as in the strigatus-group ( longiscapus  HNS  , wheeleri  HNS  , costatus  HNS  and presumably also flavidus  HNS  ). Following is a list of the presently recognized forms, including the not yet analyzed infraspecific forms of rimosus  HNS  and several new synonyms (W = worker; F = female; M = male):

bicornis Forel  HNS  , 1895, W, eastern Brazil

championi Forel  HNS  , 1899, Al, Panama (= salvini Forel  HNS  ?)

costatus Mann  HNS  , 1922, W, F, M, Honduras, Panama, Colombia

= colombianus Weber  HNS  , 1940 - NOV. SYN.

dentatus Forel  HNS  , 1901, W, F, Mexico - NOV. STAT.

flavidus Pergande  HNS  , 1895, W, Mexico

foxi Em. Andre  HNS  , 1892, W, F, Jamaica

hamulatus Weber  HNS  , 1938, W, Bolivia, Panama - NOV. STAT.

kirbyi Mayr  HNS  , 1887, W, F, Colombia, Ecuador

laevigatus Weber  HNS  , 1938, W, Bolivia, Dutch Guiana

longiscapus Weber  HNS  , 1940, W, F, Colombia, Panama

peltatus Kempf  HNS  , n. sp., W, F - southern Brazil

rimosus  HNS  (Spinola, 1851), W, Brazil: Para

= difformis  HNS  (Fr. Smith, 1858)

r. var. arnoldi Aguayo  HNS  , 1932, W, Jamaica (=: foxi Em. Andre  HNS  ?)

r. var. major Forel  HNS  , 1912, W, Guatemala, Brazil: S. Paulo

r. atratus Forel  HNS  , 1912, W, F, M, Colombia

r. breviscapus Weber  HNS  , 1940, W, Panama

r. cochunae Kusnezov  HNS  , 1949, W, Argentina: Tucuman

r. flavescens Weber  HNS  , 1948, W, Haiti

r. fuscus Emery  HNS  , 1894, W, F, M, Cisandean South America

= fusculus Emery  HNS  , 1922

= curiapensis Weber  HNS  , 1938

r. minutus Mayr  HNS  , 1862, W, F, M, from U.S.A. to n. S. America

= deformis Roger  HNS  , 1863

= steinheili Forel  HNS  , 1884

= var. comalensis Wheeler  HNS  , 1907

r. trinitatis Weber  HNS  , 1938, W, F, Trinidad, Guianas, Panama

r. venezuelensis Weber  HNS  , 1938, W, Venezuela

salvini Forel  HNS  , 1899, W, F, M, Panama, Costa Rica

= acutus Weber  HNS  , 1940 - NOV. SYN.

transversus Emery  HNS  , 1894, W, F, M, Brazil, Argentina - NOV. STAT.

- olindanus Forel  HNS  , 1901

= pencosensis Forel  HNS  , 1914 - NOV. SYN.

vorticis Weber  HNS  , 1940, W, Bolivia, Brazil: Rondonia

wheeleri Forel  HNS  , 1900, W, F, M, U.S.A.: Tex., Cal.; Mexico

The rimosus-group is much more widely distributed than the strigatus-group, ranging from southern U.S.A. both over the Antilles and Central America south to central Argentina. Yet only rimosus  HNS  with its puzzling "races" and morphs occupies the entire range of the territory (except for northeastern Brazil!), whereas the remaining species are seemingly rather restricted in their distribution. The group reaches its highest degree of diversity and endemism in northern South America and in Central America.

Most of the collected material, over 90% of the total, belongs to the ubiquitous rimosus  HNS  s. L, whose striking variability is still not understood and had to be left out for a future study. Yet a slight improvement is introduced here by raising dentatus  HNS  , hamulatus  HNS  and transversus  HNS  to full specific rank.

In short, the presently proposed arrangement, while exhausting the best of my possibilites and efforts, is not to be considered as final. Only more copious material and a better knowledge of the variability, distribution and biology of all forms will permit to raise our knowledge of the Cyphomyrmex  HNS  ants to a satisfactory level.

Bionomics. - With the exception of a few well studied species, such as rimosus minutus Mayr  HNS  (Weber, 1955) and costatus Mann  HNS  (Weber, 1957a), very little, if any, information is available for most forms. One fact, however, regarding the fungi cultivated by these ants, has become firmly established in the meantime. Whereas some species ( costatus  HNS  and wheeleri  HNS  ) grow a basidiomycete fungus of the family Agaricaceae, which under the care of the ants forms bromatia of loosely clustered hyphal swellings or gongylidia (fungus garden of the flocculent type), other species ( rimosus  HNS  , dentatus  HNS  , transversus  HNS  ) cultivate bromatia consisting of polygonal solid masses of cells of a yeastlike fungus, which Wheeler (1907: 772) named Tyridiomyces formicarum, but so far has not been truly identified.

It is interesting to note that in the aforesaid species the difference in type of fungus and bromatia coincides with a morphological difference, shown by the development and direction of the preocular carina and the postero-lateral limit of the antennal scrobe; in costatus  HNS  and wheeleri  HNS  the preocular carina fades out above the eye, but the postero-lateral limit of the scrobe behind the eye is somehow indicated, whereas in rimosus  HNS  and allies the preocular carina curves strongly mesad above the eye, and there is no proper postero-lateral limit to the scrobe. Only future research will show whether or not this relationship is constant and may be generalized.

Key to the species for workers

( C. flavidus  HNS  is not included; C. championi  HNS  is known only in the male caste).

1. Antennal scrobe reticulate and quite shining; preocular carina not curving mesad above eye, postero-lateral limit of antennal scrobe marked at least by difference of sculpture (Figs. 2, 19)........ 2

- Antennal scrobe densely but indistinctly granulate and opaque; preocular carina curving mesad above eye, the postero-laferaj border of scrobe being formed by another carina (if present), which arises from the occipital corner and extends foreward to the inferior or posterior border of eye, never joining the preocular carina (Figs. 3, 6, 11)..................................................... 4

2. Antennal scape in repose surpassing the occipital lobe (Fig. 2); pronotal tubercles absent (Fig. 18); cheeks immarginate below .... 1. longiscapus Weber  HNS 

- Antennal scape not surpassing occipital corners when in repose; lateral pronotal tubercles developed; cheeks marginate below.... 3

3. Disc of tergum I of gaster with a pair of strong longitudinal carinae (Fig. 19); midpronotal tubercles absent; postero-dorsal margin of petiole not drawn out nor bidentate (Fig. 38) .... 4. costatus Mann  HNS 

- Disc of tergum I of gaster lacking a pair of longitudinal carinae; midpronotal tubercles present (Fig. 25); postero-dorsal margin of petiole drawn out as a foliaceous bidentate lamina (Fig. 37) .... 2. wheeleri Forel  HNS 

4. Antennal scapes not surpassing the strikingly auriculate occipital lobes (Figs. 4, 5); pronotum completely unarmed (Figs. 23, 26), its sides marginate only ....................................... 5

- Antennal scapes usually surpassing the scarcely or gently drawn out occipital lobes; pronotum with the lateral tubercles always present.. 6

5. Anterior mesonotal tubercles conical, posterior ones low and tumuliform(Fig. 23); petiolar node much less than thrice as broad as long (Fig. 33)................................. 5. bicornis Forel  HNS 

- Thorax completely unarmed, its dorsum in profile evenly rounded (Fig. 26); petiolar node strikingly transverse, thrice as broad as long (Fig. 32) .............................. 6. laevigatus Weber  HNS 

6. Paired midpronotal tubercles absent ........................... 7

- Paired midpronotal tubercles' present ........................... 9

7. Hind femora not dilated nor ventrally carinate at basal third (Fig. 42); funicular segments II-VIII longer than broad .... 7. kirbyi Mayr  HNS 

- Hind femora dilated and ventrally carinate at basal third (Figs. 46| 50); funicular segments II-VIII about as long as broad ........ 8

8. Epinotum unarmed, rounded in both directions (Fig. 20); antennal scapes well projecting beyond occipital corners (Fig. 13) ...... 8. peltatus  HNS  n. sp.

- - Epinotum dentate; basal face laterally marginate to carinate (Fig. 21); antennal scapes scarcely projecting beyond tip of occipital corners (Fig. 8) ............................. 9. dentatus Forel  HNS 

9. Maximum expansion of frontal carinae less than interocular width (Fig. 6); thorax finely but distinctly rugose; lateral. pronotal and anterior mesonotal projections long and spine-like (Fig. 14) .... 10. foxi Forel  HNS 

- Maximum expansion of frontal carinae exceeding interocular width; thorax lacking distinct rugulae; lateral pronotal and anterior mesonotal projections short, tubercular or at best conical ...... 10

10. Apex of occipital lobes drawn out into a spine (Figs. 1, 3); anterior mesonotal tubercles high and conical (Figs. 15, 16) ...... 11

'- Apex of occipital lobes not drawn out into a spine; anterior mesonotal tubercle low and usually tumuliform ................ 12

11. Body without appressed scale-like hairs; basal face of epinotum sharply carinate in its entire length; posterior mesonotal tubercles low, not tooth-like (Fig. 15) ................ 11. vorticis Weber  HNS 

- Body hairs scale-like; basal face of epinotum bluntly carinate on anterior half; posterior mesonotal projections conical (Fig. 16) ...... 12. salvini Forel  HNS 

12. Petiole strikingly transverse, thrice as broad as long (Fig. 30); postpetiole discally deeply and broadly impressed; body hairs thickly squamous .................................. 14. transversus Emery  HNS 

- Petiole narrower, not thrice as broad as long (Fig. 39); postpetiole with a shallower middorsal impression; body hairs finer ...... 13

13. Hairs on head and gaster recurved or hook-like, not appressed nor strictly scale-like; thoracic tubercles sharply pointed (Fig. 22).. 15. hamulatus Weber  HNS 

- Hairs on head and gaster appressed and scale-like; thoracic tubercles low and tumuliform, never pointed .......... 16. rimosus (Spinola)  HNS