Myrmecotypus O. Pickard-Cambridge, 1894

Perger, Robert & Rubio, Gonzalo D., 2021, Myrmecotypus haddadi sp. nov. - a new species of ant resembling sac spider from the Bolivian orocline (Araneae: Corinnidae: Castianeirinae), Zootaxa 4969 (1), pp. 54-60 : 55-56

Genus Myrmecotypus O. Pickard-Cambridge, 1894

Type species: Myrmecotypus fuliginosus O. Pickard-Cambridge, 1894 (by original designation)

Diagnosis. Cephalic region wide (cephalic index range 64–89), carapace narrowed (carapace index ˂ 60), without thoracic groove but with slight depression instead; PER wider than AER and almost straight to moderately recurved, AME larger than ALE, PME–PME greater than PME–PLE, PLE situated close to lateral margin of cephalic area; abdomen only very slightly petiolated; tibia I ventral spines paired in 2–2, 3–2, 3–3 or 4–4 arrangement; trochanter IV notch usually absent, with only a tiny one, if present ( Perger & Rubio 2020a, 2021).

Key to the known Bolivian species of Myrmecotypus

1. Tibia I spination 3-3 or 5-5.............................................................................. 2

- Tibia I spination 4-4............................................................... M. niger Chickering, 1937

2. Carapace with shallow transverse constriction...............................................................3

- Carapace with deep transverse constriction................................... M. tahyinandu Perger & Rubio, 2020

3. Males.............................................................................................. 5

4. Females............................................................................................. 7

5. Embolus with at least one tegular projection near base........................................................ 6

- Embolus without tegular projection, twisted....................................... M. iguazu Rubio & Arbino, 2009

6. Embolus slightly curved................................................ M. rubrofemoratus Perger & Rubio, 2021

- Embolus cat claw-shaped................................................................ M. haddadi sp. nov.

7. Epigyne openings rounded.............................................................................. 8

- Epigyne openings narrow, transverse............................................. M. iguazu Rubio & Arbino, 2009

8. Epigyne openings distal to spermathecae................................... M. rubrofemoratus Perger & Rubio, 2021

- Epigyne openings mediolateral to spermathecae.............................................. M. haddadi sp. nov.