Cryptomyrmex

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The two species in this genus are known from a small number of workers and a single queen. Nothing is known about the biology of Cryptomyrmex.

Identification

Fernández (2004) - This genus is created on the basis of two species from Brazil and Paraguay. Among its distinctive characteristics are mandibles with four teeth on the masticatory margin, a low tooth in the basal margin, and petiole with a long, low node. The tooth of the basal margin is lower that in Adelomyrmex, and is not accompanied by a notch as in that genus. An important characteristic is the head profile in frontal view, in which the anterior half (between the mandibular base and more or less the level of the eye) is slightly concave, and the posterior half is slightly convex. No other species in the similar group of three closely allied genera (Adelomyrmex, Baracidris and Cryptomyrmex) shares this head profile and helps separate Cryptomyrmex as a distinct genus. The potential of this character still needs examination in the context of the myrmicine ants. Petiole shape also separates Cryptomyrmex from the other two species but this character may be plesiomorphic as it present in Hylomyrma. The eyes are normally visible stereoscopically, but not in SEM images, suggesting that these are dark spots beneath the tegument or slightly developed on the tegument surface. This trait also represents a potential synapomorphy for the genus. These degenerate eyes might be associated with the subterranean habit of these ants, besides which nothing is known of the biology of the genus.

A generic group consisting of Cryptomyrmex, Adelomyrmex and Baracidris shares the following characters: With characters of solenopsidine tribe group (Bolton, 2003:57). Mandibles with four to seven teeth in the masticatory border (Fig. 4). Basal margin of mandibles simple to armed. Internal side of mandibles with a row of 2-3 to 5-6 hairs modified as lamelliform setae. Clypeus with median longitudinal plate, ridge or strip raised (Fig. 3). A median clypeal seta usually present. Palpal formula 2,2 or less. Antennae 12 segmented, with club 2-segmented. Propodeum angulated or armed with teeth. U-shaped sulcus in the basalmost portion of the first tergum. Monomorphic.

These three genera can be separated using the following key:

1

  • Mandibles with four teeth in the masticatory border; frontal area lacking; petiolar node low; Brazil and Paraguay . . . . . Cryptomyrmex
  • Mandibles with 5-7 teeth in the masticatory border; frontal area present, reduced; petiolar node high (Fig. 2) . . . . . 2

2

return to couplet #1

  • Clypeal lateral teeth present; basal margin of mandible with teeth and notch; hypostomal teeth present, usually small; Neotropics, New Guinea, Fiji, Samoa and New Caledonia . . . . . Adelomyrmex
  • Clypeal lateral teeth absent; basal margin of mandible without teeth; hypostomal bridge without teeth; Africa . . . . . Baracidris
AntWeb icon 02.png See images of species within this genus

 

Keys to Species in this Genus

Distribution

Distribution and Richness based on AntMaps

Species by Region

Number of species within biogeographic regions, along with the total number of species for each region.

Afrotropical Region Australasian Region Indo-Australian Region Malagasy Region Nearctic Region Neotropical Region Oriental Region Palaearctic Region
Species 0 0 0 0 0 2 0 0
Total Species 2841 1736 3045 932 835 4379 1741 2862

Biology

Life History Traits

  • Mean colony size: ? (Greer et al., 2021)
  • Compound colony type: not parasitic (Greer et al., 2021)
  • Nest site: hypogaeic (Greer et al., 2021)
  • Diet class: ? (Greer et al., 2021)
  • Foraging stratum: subterranean/leaf litter (Greer et al., 2021)

Castes

Males have yet to be collected for this genus.

Worker

Morphology

Worker Morphology

Explore-icon.png Explore: Show all Worker Morphology data or Search these data. See also a list of all data tables or learn how data is managed.

 • Eyes: 2-10 ommatidia • Pronotal Spines: absent • Mesonotal Spines: absent • Propodeal Spines: present • Petiolar Spines: absent • Caste: none or weak • Sting: present • Metaplural Gland: present • Cocoon: absent

Phylogeny

Myrmicinae
Myrmicini
Pogonomyrmecini
Stenammini
Solenopsidini
Attini

Ochetomyrmex  (2 species, 0 fossil species)

Tranopelta  (2 species, 0 fossil species)

Diaphoromyrma  (1 species, 0 fossil species)

Lachnomyrmex  (16 species, 0 fossil species)

Blepharidatta  (4 species, 0 fossil species)

Allomerus  (8 species, 0 fossil species)

Wasmannia  (11 species, 0 fossil species)

Pheidole  (1,294 species, 7 fossil species)

Cephalotes  (123 species, 16 fossil species)

Procryptocerus  (44 species, 0 fossil species)

Strumigenys  (879 species, 4 fossil species)

Phalacromyrmex  (1 species, 0 fossil species)

Pilotrochus  (1 species, 0 fossil species)

Protalaridris  (7 species, 0 fossil species)

Rhopalothrix  (19 species, 0 fossil species)

Basiceros  (9 species, 0 fossil species)

Octostruma  (35 species, 0 fossil species)

Eurhopalothrix  (54 species, 0 fossil species)

Talaridris  (1 species, 0 fossil species)

Acanthognathus  (7 species, 1 fossil species)

Daceton  (2 species, 0 fossil species)

Lenomyrmex  (7 species, 0 fossil species)

Microdaceton  (4 species, 0 fossil species)

Orectognathus  (29 species, 0 fossil species)

Colobostruma  (16 species, 0 fossil species)

Epopostruma  (20 species, 0 fossil species)

Mesostruma  (9 species, 0 fossil species)

Paleoattina

Apterostigma  (44 species, 2 fossil species)

Mycocepurus  (6 species, 0 fossil species)

Myrmicocrypta  (31 species, 0 fossil species)

Neoattina

Cyatta  (1 species, 0 fossil species)

Kalathomyrmex  (1 species, 0 fossil species)

Mycetarotes  (4 species, 0 fossil species)

Mycetosoritis  (2 species, 0 fossil species)

some Cyphomyrmex  (23 species, 2 fossil species)

some Cyphomyrmex

Paramycetophylax  (1 species, 0 fossil species)

Mycetophylax  (21 species, 0 fossil species)

Mycetagroicus  (4 species, 0 fossil species)

Mycetomoellerius  (31 species, 1 fossil species)

Sericomyrmex  (11 species, 0 fossil species)

Xerolitor  (1 species, 0 fossil species)

Paratrachymyrmex  (9 species, 0 fossil species)

Trachymyrmex  (9 species, 0 fossil species)

Amoimyrmex  (3 species, 0 fossil species)

Atta  (20 species, 1 fossil species)

some Acromyrmex  (56 species, 0 fossil species)

some Acromyrmex

Pseudoatta  (2 species, 0 fossil species)

Crematogastrini

Rostromyrmex  (1 species, 6 fossil species)

Cardiocondyla  (89 species, 0 fossil species)

Ocymyrmex  (34 species, 0 fossil species)

Nesomyrmex  (84 species, 2 fossil species)

Xenomyrmex  (5 species, 0 fossil species)

Terataner  (14 species, 0 fossil species)

Atopomyrmex  (3 species, 0 fossil species)

Cataulacus  (65 species, 3 fossil species)

Carebara  (249 species, 9 fossil species)

Diplomorium  (1 species, 0 fossil species)

Melissotarsus  (4 species, 1 fossil species)

Rhopalomastix  (14 species, 0 fossil species)

Calyptomyrmex  (38 species, 0 fossil species)

Strongylognathus  (27 species, 0 fossil species), Tetramorium  (598 species, 2 fossil species)

Cyphoidris  (4 species, 0 fossil species)

Dicroaspis  (2 species, 0 fossil species)

Aretidris  (2 species, 0 fossil species)

Vollenhovia  (83 species, 3 fossil species)

Dacetinops  (7 species, 0 fossil species)

Indomyrma  (2 species, 0 fossil species)

Crematogaster  (784 species, 3 fossil species)

Meranoplus  (91 species, 0 fossil species)

Lophomyrmex  (13 species, 0 fossil species)

Adlerzia  (1 species, 0 fossil species)

Recurvidris  (12 species, 0 fossil species)

Stereomyrmex  (3 species, 0 fossil species)

Trichomyrmex  (29 species, 0 fossil species)

Eutetramorium  (3 species, 0 fossil species)

Royidris  (15 species, 0 fossil species)

Malagidris  (6 species, 0 fossil species)

Vitsika  (16 species, 0 fossil species)

Huberia  (2 species, 0 fossil species)

Podomyrma  (62 species, 1 fossil species)

Liomyrmex  (1 species, 0 fossil species)

Metapone  (31 species, 0 fossil species)

Kartidris  (6 species, 0 fossil species)

Mayriella  (9 species, 0 fossil species)

Tetheamyrma  (2 species, 0 fossil species)

Dacatria  (1 species, 0 fossil species)

Proatta  (1 species, 0 fossil species)

Dilobocondyla  (22 species, 0 fossil species)

Secostruma  (1 species, 0 fossil species)

Acanthomyrmex  (19 species, 0 fossil species)

Myrmecina  (106 species, 0 fossil species)

Perissomyrmex  (6 species, 0 fossil species)

Pristomyrmex  (61 species, 3 fossil species)

some Lordomyrma  (36 species, 0 fossil species)

Propodilobus  (1 species, 0 fossil species)

Lasiomyrma  (4 species, 0 fossil species)

some Lordomyrma

Ancyridris  (2 species, 0 fossil species)

some Lordomyrma

Paratopula  (12 species, 0 fossil species)

Poecilomyrma  (2 species, 0 fossil species)

Romblonella  (10 species, 0 fossil species)

Rotastruma  (3 species, 0 fossil species)

Gauromyrmex  (3 species, 0 fossil species)

Vombisidris  (19 species, 0 fossil species)

Temnothorax  (512 species, 7 fossil species)

Harpagoxenus  (4 species, 0 fossil species)

Formicoxenus  (8 species, 0 fossil species)

Leptothorax  (20 species, 0 fossil species)

See Phylogeny of Myrmicinae for details.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • CRYPTOMYRMEX [Myrmicinae: Adelomyrmecini]
    • Cryptomyrmex Fernández, 2004b: 328. Type-species: Adelomyrmex longinodus, by original designation.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

Head with convex posterior and evenly rounded corners. Hypostomal bridge strong and evenly developed; very much distinct from head venter. Hypostomal teeth absent. Sides of head slightly concave before the eyes, slightly convex past eyes. Mandibles with 4 teeth decreasing in size from the apical teeth, the antepenultime (subbasal) smallest. Mandibles with distinct tooth in their basal margin, at midlength, not followed by a notch. Maxillary palpomere sub cylindrical and the labial palps geniculate. Eyes lenses absent, although the pigments are clearly visible under the reflective light, but not under the SEM picture, or poorly developed (Fig. 7). Clypeus short, elevated in the middle as a narrow stripe, pointed and fused with frontal carinae. Anterior margin of the clypeus without teeth, although with feebly projections instead. Dorsal view of thorax as in figure 7. Propodeum spiracle relatively large, its orifice circular and situated just above the midlenght of the sclerite; propodeum dorsum straight, meeting declivity in sharp diverging teeth, gently curved inwards when seen from above; declivity smooth, the meta pleural lobes not jointed over the foramen. Opening of the metapleural gland indistinct. Petiole with a short anterior peduncle, lacking an anteroventral process; petiolar node subquadrate, dorsally broadly convex in profile till it approaches the postpetiole where it ends abruptly in a right angle. Postpetiole low and small, gently convex in profile, in dorsal view very broadly attached to the gaster. Sting large and strongly sclerotized, disproportionately powerful.

Queen

Larger, but not very much, than conspecific worker. Compound eyes with several facets over the largest diameter. Otherwise description as worker.

References

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