Parajapyx, Silvestri, 1903

Montejo-Cruz, Maira, García-Gómez, Arturo & Palacios-Vargas, José G., 2021, Four new species of Parajapyx (Diplura: Parajapygidae) from Mexico with redescription of Parajapyx isabellae aztecus Silvestri, Zootaxa 4948 (2), pp. 221-244 : 243

Key species Parajapyx from México

1. With 18 antennomeres................................................................................. 2

1’. With 17 antennomeres................................................................................. 6

2. Subcoxal organ with less than 10 glandular setae............................................................ 3

2’. Subcoxal organ with more than 10 glandular setae........................................................... 4

3. Subcoxal organ with 5–6 setae glandular; cerci dorsal with 5 pore the same size................................................................................... P. mexicanus Silvestri, 1948 ; Guerrero, Quintana Roo and Yucatán.

3’. Subcoxal organ with 10 setae glandular; cerci dorsal with 10–12 pore the same size................................................................................................... P. bonetianus Silvestri, 1948 ; Quintana Roo

4. Subcoxal organ with 12 setae glandular and 5 accompanying setae; cerci dorsal with 4 pores in cuticular depressions; without ma and mp macrosetae in mesoscutum and metascutum................................................................................. Parajapyx silvestrii Montejo-Cruz, García-Gómez & Palacios-Vargas , sp. nov.; Quintana Roo

4’. Subcoxal organ with more than 20 setae glandular and more than 9 accompanying setae; all macroseta in mesoscutum and metascutum present................................................................................... 5

5. Subcoxal organ with 30–50 setae glandular and 10 accompanying setae; all the same size (lager) macroseta in mesoscutum and metascutum; one macroseta in femur; ventral tergite IX slightly shorter than tergite VIII (0.2mm) with 2+2 macrosetae above the midline; cerci dorsal with 4–7 pores; in cerci one macroseta extra beside M6............................................................... Parajapyx brunocondei Montejo-Cruz, García-Gómez & Palacios-Vargas , sp. nov.; Jalisco

5’. Subcoxal organ with 20–40 setae glandular and 9–11 accompanying setae; ma and mp macrosetae reduced in mesoscutum and metascutum; tergite IX (0.2mm) slightly longer than tergite VIII with 2+2 macrosetae above the midline and one extra macrosetae; cerci dorsal with 8 pores................. Parajapyx yunyanorum Montejo-Cruz & García-Gómez , sp. nov.; Puebla

6. Cerci dorsal with one big pore surrounded by 5–7 small pores.................................................. 7

6’. Cerci dorsal with all same size pores...................................................................... 8

7. Subcoxal organ with 3 setae glandular and 4 sensorial setae; cerci dorsal with one big pore surrounded by 7 small pores.................................................................... P. intermedius Silvestri 1948 ; San Luís Potosí.

7’. Subcoxal organ with 16 setae glandular; cerci dorsal with one big pore surrounded by 5 small pores....................................................... P. isabellae var. aztecus Silvestri 1948 ; Baja California Sur, Morelos and Veracruz.

8. Subcoxal organ with 14 setae glandular; cerci dorsal with one pore................................................................................... P. grassianus Silvestri, 1911 ; Quintana Roo, San Luís Potosí, Veracruz, Chiapas

8’. Subcoxal organ with 20 setae glandular; cerci dorsal with 5 pores; tergite X with 11 normal setae................................................................... Parajapyx pagesi Montejo-Cruz & García-Gómez , sp. nov.; Veracruz