Characterized by the following synapomorphies: (I) eyes large, ( 2) base of the mandibles of the worker and of the gyne laterally angulate, (3) dorsum of the postpetiole of the worker and of the gyne with three long, pointed hairs at most, (4) fore basitarsi as long as the mid basitarsi, (5) outer apical edge of the mid and hind basitarsi of the worker and of the gyne with 6 or 7 pine-like setae, (6) scutellum of the gyne with very thick striae, (7) male hypopygium strongly constricted distally.
Cylindromyrmex boliviae is an isolate species representing a clade of its own. It differs from the species of the striatus clade by the following characters· (1) hind coxae with a concavity close to the articulation with trochanter, (2) male with frontal carinae broad anteriorly and narrower posteriorly, and (3) male hypogium with a bidentate median projection between the apodemes. It differs from the species of the brevitarsus and longiceps clades by the following characters: (1) mid basitarsi longer than ½ of the hind basitarsi, and (2) apical tarsomeres of hind legs shorter than the sum of second and third tarsomeres.
- Cylindromyrmex escobari
- Cylindromyrmex electrinus
- Cylindromyrmex brevitarsus
- Cylindromyrmex darlingtoni
They are characterized by the following synapomorphies: (1) occiput high. (2) ventral process of the petiole triangular, and (3) hind basitarsi with 4 spine-like setae.
They are characterized by the following synapomorphies: (1) first and second gastric tergites striate, (2) male frontal carinae strongly broad anteriorly and touching each other posteriorly, (3) male hypopygium with a simple, impair, median projection between the apodemes.