Parajapyx yunyanorum 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 : 234-235

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

Figs. 40–52 ; Tables 7–8

Type specimens. Holotype (female) on slide: México Puebla Zapotitlán de las Salinas. Ex. Prosopis laevigata , 13/vi/ 2014, D. Sánchez, coll. Deposited at “Colección de ácaros y colémbolos”, Facultad de Ciencias , UNAM . Paratypes (three females and one male) on slides: same data as holotype. Deposited at “Colección de ácaros y colémbolos”, Facultad de Ciencias , UNAM .

Etymology. This new species is dedicated to Dr. Yun Bu and his wife Yan Gao, from Shanghai Natural History Museum, China for his contribution on the study of Mexican Apterygota.

Description. Holotype (female): body length 4.1 mm. Paratypes (three females and one male): body length range (n=5) 2.1‒4.9 mm. Cuticle ornamentation in the shape of hexagon cells.

Head vertex ( Fig. 40 ) with 12+12 normal setae which 7+7 smaller, 2+2 normal setae close to the antennae; front with 1+1 macrosetae and 4+4 normal setae; labrum with 1+1 normal setae and 6+6 microsetae. On head venter ( Fig. 41 ) 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 5+5 normal setae, submentum with 2+2 normal setae

Mandible ( Fig. 42 ) 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.

Antenna ( Fig. 43 ) with 18 segments, bacilliform setae number in antennal segments as follows: I‒IV, 0; V, 1‒2; VII, 5; X‒XIII, 6‒7; XV‒XVII, 8; XVIII more than 10 and four placoid sensilla.

Thoracic chaetotaxy is shown in Table 7 ( Fig. 40 ).

Sometimes, in mesonotum presents 1+1 or 2+1 setae normal setae.

Length of Leg III ( Fig. 44 ) 0.3mm, with smooth setae; coxa with 5 normal; trochanter with 4 normal setae; femur with 8 normal setae and 5 microsetae; tibia with 8 normal setae; tarsus with 9 normal setae; claws symmetrical.

Abdominal chaetotaxy is shown in Table 8 ( Figs.45, 47, 48 ).

Sometimes abdominal prescutum I with 1+1+1 normal setae.

Tergite IX ( Figs.47, 48 ) (length= 0.2mm) slightly longer than tergite VIII, with 2+2 macrosetae above the midline and additional one macrosetae. Tergite X ( Figs.51, 52 ) with 2+2 macrosetae reduced. On sternite I ( Fig. 46 ) prescutum with 3+3 normal setae and 1+1 microsetae; scutum with 9+9 normal setae and 5+5 microsetae. Typical styles of the genus. Subcoxal organ ( Fig. 49 ) with 9–11 accompanying setae, 20–40 glandular setae and 3 sensorial setae. On Sternite II to VII ( Fig. 46 ) prescutum with 3+3 normal setae and 3+3 microsetae; scutum with 11+11 normal setae and 4+4 microsetae. Eversible vesicles present on sternites II and III. Female genital papilla valves ( Fig. 50 ) each with 7+7 normal setae, one internal microsensillum and 3 external microsensilla. Male genital papilla ( Fig. 50 ) with 6+6 normal setae.

Each cercus ( Figs.51, 52 ) with five internal teeth; D4 smallest, D1 and D3 larger, and D2 medium size but ever larger than D4. Cerci with two setae, M2’ and a’, close to seta M2. Dorsally without “h” seta. Ventrally, without M3 and “e” setae. Each cercus with eight pores dorsally.

Phyletic affinities. Parajapyx yunyanorum sp. nov. differs from all other Parajapyx species in the following combination of characters: mesoscutum and metascutum with ma and mp macrosetae reduced, abdominal scutum I without ma macroseta, abdominal scutum II–VII with 4 macrosetae (3 ma and 1 mp) reduced and without lp macrosetae and tergite IX larger (0.2mm) with 2+2 macrosetae setae above midline and one extra macrosetae. The reduction and loss of setae could be similar to Parajapyx reymi Pagés 1953 from Sahara but in this specie in both mesoscutum and metascutum all macrosetae are not reduced, and without one ma and la macrosetae in abdominal scutum I and without one ma and lp macrosetae in abdominal scutum II to VII.

Figures

FIGURES 40–44. Parajapyx yunyanorum sp. nov.; 40. Dorsal view of head and thoracic nota (scale 70 µm). 41. Ventral head (scale 70 µm). 42. Maxilla, mandible and labrum (scale 30 µm). 43. Antennal segments IV, V and XVIII (only the dorsal 9 bacilliform sensilla and 2 placoid sensilla shown for XVIII) (scale 30 µm). 44. Leg III (scale 30 µm).

FIGURES 45–48. Parajapyx yunyanorum sp. nov.; 45. Abdominals tergites I and II (scale 150 µm). 46. Abdominals sternites (scale 150 µm). 47. Tergites VIII and IX, dorsal view (scale 150 µm). 48. Tergites VIII and IX, ventral view (scale 150 µm).

FIGURES 49–52. Parajapyx yunyanorum sp. nov.; 49. Subcoxal organ (scale 20 µm). 50. Female and male genital papilla (scale 20 µm). 51. Tergite X and cerci, dorsal view (scale 80 µm). 52. Tergite X and cerci, ventral view (scale 80 µm).