Parajapyx pagesi Montejo-Cruz & García-Gómez, 2021

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 : 226-227

Parajapyx pagesi Montejo-Cruz & García-Gómez , sp. nov.

Figs. 14–26 ; Tables 3–4

Type specimens. Holotype (female) on slide: México, Veracruz, Biology Station “Los Tuxtlas”, 25/vi/2009, litter rainforest, A. García-Gómez, coll. Deposited at “Colección de ácaros y colémbolos”, Facultad de Ciencias , UNAM . Paratypes (two females) on slides: same data as holotype. Deposited at “Colección de ácaros y colémbolos”, Facultad de Ciencias , UNAM .

Etymology. Named after Jean Pagés whose exhaustive research is the base of systematics and taxonomy of diplurans.

Description. Holotype (female): body length 2.3 mm. Paratypes (two females): body length range (n=2) 2.1‒ 2.3 mm. Cuticle ornamentation in the shape of hexagon cells.

Head vertex ( Fig. 14 ) with 9+9 normal setae of similar size and 2+2 normal setae close to the antennae; front with 2+2 macrosetae and 3+3 normal setae; labrum with 1+1 normal setae and 6+6 microsetae. On head venter ( Fig. 15 ) inner lobe with 1+1 normal setae, external lobe with 13+13 normal setae. In place of labial palpus 1+1 macrosetae, 3+3 normal setae, of which two are smaller; admentum with 2+2 macrosetae and 9+9 normal setae; plica orales with 6+6 normal setae, submentum with 2+2 normal setae.

Mandible ( Fig. 16 ) with five teeth and four denticles, maxilla with first lamella slender and slightly larger than half of the second, other lamellae pectinate and similar each other; maxillary palp with 9 normal setae and one apical microsensillum.

Antennae ( Fig. 17 ) with 17 segments, bacilliform setae number in antennal segments as follows: I‒IV, 0; V‒VI, 1‒2; VII, 4; VIII‒XI, 6; XI‒ XV, 6‒8; XVI, 8 and XVII, more than 14 and four placoid sensilla.

Thoracic chaetotaxy is shown in Table 3 ( Fig. 14 ).

Length of Leg III ( Fig. 18 ) 0.2mm, with smooth setae; coxa with 3 normal setae and 3 microsetae; trochanter with 4 normal setae and 3 microsetae; femur with 10 normal setae and 2 microsetae; tibia with 8 normal setae; tarsus with 10 normal setae; claws symmetrical.

Abdominal chaetotaxy is shown in Table 4 ( Figs.19, 21, 22 ).

In tergite X the intermediate macrosetae is reduced.

Tergite VIII twice length of tergite IX (length= 0.07mm) ( Figs.21, 22 ). On sternite I ( Fig. 20 ) prescutum with 4+4 normal setae; scutum with 16+16 normal setae and 5+5 microsetae. Typical styles of the genus. Subcoxal organ ( Fig. 23 ) with 3 accompanying setae, 20 (rarely 18) glandular setae and 2 sensorial setae. On sternite II to VII ( Fig. 20 ) prescutum with 4+4 normal setae and 3+3 microsetae; scutum with 14+14 normal setae and 5+5 microsetae. Eversible vesicle present on sternite II and III. Female genital papilla valves ( Fig. 24 ) each with 6 normal setae, one internal microsensillum and 2 external microsensilla.

Each cercus ( Figs.25, 26 ) with five internal teeth; D4 small, D5 and D3 larger, and D2 and D1 medium and similar with each other. Cerci without “e” seta, but with two setae, M2’ and a’, close to seta M2. Ventrally M3 absent. Each cercus with five pores dorsally.

Phyletic affinities. Parajapyx pagesi sp. nov. differs from all other Parajapyx species in the following combination of characters: pronotum with two additional normal setae, abdominal prescutum with 1+1+1 setae, one ma macroseta absent in abdominal scutum, subcoxal organ with 20 glandular setae, tergite X with 11 setae, most in ventral view (7 setae) and without setae 0 dorsally. It is similar to P. grassianus from México and Parajapyx tristanianus Silvestri, 1929b from Costa Rica because it presents 17 antennomeres, pronotum with 5 macrosetae and 2 normal setae, organ subcoxal with about 20 glandular setae and abdominal prescutum with 1+1+1 setae. It differs in other features such as all macrosetae on abdominal scutum which are different in arrangement and number, P. pagesi sp. nov. exhibits 5 normal setae in abdominal scutum whereas P. grassianus and P. tristanianus present 6 normal setae.

Figures

FIGURES 14–18. Parajapyx pagesi sp. nov.; 14. Dorsal view head and thoracic nota (scale 60 µm). 15. Ventral head (scale 60 µm). 16. Maxilla, mandible and labrum (scale 30 µm): 17. Antennal segments X, XI, XVI and XVII (only the dorsal 12 bacilliform sensilla and 2 placoid sensilla shown for XVII) (scale 30 µm). 18. Leg III (scale 50 µm).

FIGURES 19–22. Parajapyx pagesi sp. nov.; 19. Abdominals tergites I and II (scale 70 µm). 20. Abdominals sternites I and II (scale 70 µm). 21. Tergites VIII‒X, dorsal view (scale 80 µm). 22. Tergites VIII‒IX, ventral view (scale 80 µm).

FIGURES 23–26. Parajapyx pagesi sp. nov.; 23. Subcoxal organ (scale 20 µm). 24. Female genital papilla (scale 20 µm). 25. Cerci dorsal view (scale 70 µm). 26. Cerci ventral view (scale 70 µm).