Pseudorhacochelifer, Beier, 1976

Hernández-Corral, Jesús, Zaragoza, Juan A. & Micó, Estefanía, 2018, New species of Pseudoscorpiones (Arachnida) from tree hollows in a Mediterranean oak forest in Spain, Zootaxa 4497 (2), pp. 201-225 : 216

Key to adults of Pseudorhacochelifer species and the species of Rhacochelifer showing elongated keels on posterolateral corners of carapace and anterior tergites in males

1 Pedipalpal femur and patella with coarser granules besides normal granulation..................................... 2

- Pedipalpal femur and patella without coarser granules......................................................... 3

2 Larger and more slender pedipalps: femur (♂) 3.9–4.4 times longer than broad (length 0.86–0.99 mm), (♀) 3.7–4.1 times longer than broad (length 0.90–1.04 mm); chela with pedicel (♂) 3.7–4.0 times longer than broad, (♀) 3.3–3.6 times longer than broad................................... Pseudorhacochelifer canariensis Mahnert, 1997 (Canary Islands, Tenerife).

- Shorter and stouter pedipalps: femur (♂) 3.7–4.1 times longer than broad (length 0.76–0.84 mm), (♀) 3.4–3.8 times longer than broad (length 0.78–0.92 mm); chela with pedicel (♂) 3.5–3.7 times longer than broad, (♀) 3.2–3.6 times longer than broad......................................... Pseudorhacochelifer spiniger ( Mahnert, 1978) (mainland Portugal).

3 Pedipalpal femur 3.9–4.1 times longer than broad............................................................ 4

- Pedipalpal femur 3.2–3.7 times longer than broad............................................................ 5

4 Smaller species, pedipalpal femur length in males 0.71 mm ....................................................................................... Pseudorhacochelifer schurmanni Beier, 1976 (Canary Islands: La Palma, Tenerife).

- Larger species, pedipalpal femur length in males 0.88 mm ......... Pseudorhacochelifer coiffaiti ( Vachon, 1961) (Madeira) .

5 Pedipalpal femur about 0.90 and chela about 1.50 mm long..................................................................................... Rhacochelifer peculiaris (L. Koch, 1873) (Central Europe and Mediterranean region).

- Pedipalpal femur about 0.50–0.70 mm and chela about 0.80–1.00 mm long........................................ 6

6 Smaller species, pedipalpal femur about 0.50 mm and chela about 0.80 mm long..................................................................................................... Rhacochelifer tauricus Beier, 1969 ( Turkey) .

- Larger species, pedipalpal femur about 0.70 mm and chela about 1.00 mm long.................................... 7

7 Medial setae present on hemitergites........................ Rhacochelifer euboicus Mahnert, 1977 (mainland Greece).

- Medial setae absent on hemitergites.................................... Rhacochelifer gaeli n. sp. (mainland Spain).