Borgesminthurinus andinus, Palacios-Vargas & Vacaflores-Argandoña, 2020

Palacios-Vargas, José G. & Vacaflores-Argandoña, Ma. René, 2020, A new genus and species of Katiannidae (Collembola: Symphypleona) from Bolivia, Zootaxa 4819 (2), pp. 201-215 : 207-214

Borgesminthurinus andinus gen. nov., sp. nov. Palacios-Vargas et Vacaflores-Argandoña

Figs. 1‒32

Type locality: Bolivia, Department of La Paz, Province Los Andes Location Pucarani-Condoriri, River Palcoco , sample taken with surfer in the river, with riverside vegetation corresponding to ecological floor of PUNA, geographical coordinates of sampling 16°30’01” S and 68°35’08” W to 4,139 m. a.s.l. Collection date corresponding to the end of the wet season in the region 21/iv/2017, Adilen Fernández coll.

Type material. Holotype female and 9 paratypes will be kept at senior author institution. Two paratypes will be deposited at Bolivian Wildlife Collection , Institute of Ecology, Universidad Mayor de San Andrés, La Paz, Bolivia.

Description. Body length (n=10): 1,250 μm; head 640 μm. Cuticle finely granulated. Setae thin and smooth on Ant. IV, labrum, labium and furcula ( Figs 1, 4, 5, 6 , 15 ); thick and finely barbulate on Ant. I‒III; head, body, and legs ( Figs 2, 3 , 24 , 25 , 31 ), except 4 pair of setae at posterior part of Abd. IV. Ventrally without barbulate setae ( Fig. 23 ). Colour very dark purple almost black, with a pattern of several circular or elliptical sepia patches on head ( Fig. 20 ); eyes patch black. Body very dark purple, almost black, with irregular pattern of circular or elliptical patches, and four constant bands, 2 on Th. I, 1 on Th. II and III, and one between the greater abdomen and lesser abdomen ( Fig. 19 ).

Ant. I and II very dark, III and IV lighters. Legs and furcula paler than body. Body globular; Abd. V distinctly from furcal and anal segment ( Fig. 17 ). Head clothed with abundant moderately long and thick barbulate setae, those on top of head longer and thicker than those of anterior part ( Figs 8 , 24 ). Three short trichobothria (A-C) on each side of greater abdomen, arranged in a triangle ( Fig. 31 ), B, closer to A. Lesser abdomen with a short trichobothria D ( Fig. 17 ) between 2 microsetae. Antennae about 1.2-1.4 times longer than the diameter of the head. Relative lengths of Ant. I: II; III; IV are as 1: 2.4; 2.9; 7.5 ( Figs 1, 2 ). Ant. I with 5 thick barbulate setae and 2 smooth thin and short ventrals. Ant. II with 16 thick barbulate setae and 2 ventral smooth. Ant. III with 17 thick barbulate setae (not longer than the width of Ant.) and 4 smooths; in middle part with a papilla subdivided into four vesicles ( Figs 2 , 25 ). Ant. organ III with 2 exposed, short elliptical sensilla, two guard sensilla smooth thin and shorter than setae and one short ventral microsensillum ( Fig 3 ). Ant. IV simple, without subdivisions, about 1.5 times the size of Ant. III, with 14-15 irregular whorls of setae, which are in 8 longitudinal rows; 2 rows of short sensilla and one subapical pit ( Figs 1 , 26 ).

Labrum with 6 prelabral setae; 5 p, 5 m and 4 a, those lateral thicker than other ( Figs 4 , 28 ). Mandible well developed, with molar-plate and apically with 5 teeth. Head of maxilla globular with 2 teeth and six lamellae ( Fig. 7 ). Eight eyes on each side of the head, cornea C, D and G smaller than others ( Figs 8 , 27 ). Interocular setae short and close to cornea G. Two small cuticular lobulations on central part of head close to eye-patch ( Fig. 24 ). Labium ( Fig. 6 ) with 7 pairs basal setae (5 V and 2 Cp) 4 distal medial (L), 5 centro distal and two pairs of postlabial (in parenthesis chaetotaxy following Baquero et al. 2006). Labial papilla with tubercles A-E (sensu Fjellberg 1999).

Metathoraxic trochanter with trochanteral organ ( Figs 11 , 21). Tibiotarsi I-III with 7 clearly capitate tenent hairs ( Figs 9, 10, 12 , 13 ). According to Nayrolles (1988), the setae would be named as: ka, kp; and setae from whorl I: a, ae, e, pe, p. Unguis moderately long with one inner tooth in the third apical ( Figs 13 , 34); dorsally with a big and long pseudonychia with about 9 teeth on each side ( Figs 12 , 13 ). No tunica. Ratio ungues/empodial appendage 1: 0.5. Empodial appendage lanceolate, lamellate, several corner-teeth and small subapical filament ( Figs 9, 10, 12 , 13 ), Tita. I, with subapical filament extending to tip of ungues ( Fig. 29 ), on other Tita. they are shorter than unguis ( Fig. 30 ).

Tenaculum with tridentate rami (sometimes with an apical filament on one or both rami), and one small appendage at the base of each rami ( Fig. 14 ); corpus tenaculum with 2 setae. No neosminthuroid seta. Manubrium with 9 pairs of setae ( Fig. 15 ). Ratio manubrium: dens; mucro as 1: 1.3; 4.2. Dens with a total of 22 setae ( Fig. 15 ), 8 external setae (E 1‒8), four dorso-internal setae (Di 1, Di 2‒5) and three lateral setae (L 1, L 5‒6); three ventro-distal, two ventro-subapical (Ve 2), one ventro-proximal (Ve 5)‒‒ventral formula: 4, 2 … 1. Dens about 3 times length of mucro. Mucro serrated only in inner edge, and with two notches in outer edge ( Fig. 15 ). Mucronal seta absent.

Subanal appendage of female thick, palmate with 7‒11 branches ( Figs 18 , 22). Ratio mucro: subanal append-age: 1.2. Female genital plate with 7‒15 setae ( Figs 18 , 22). Seta A0 acuminate ( Fig. 18 ). Anal valves of females without winged setae or basally broadened. Males not found.

Variation. Ant. III papilla seems to have 3 or 4 vesicles depending on the position. Number of branches of female anal appendage from 7 to 11.

Derivatio nominis: The name of the new species is locative, for Los Andes.

Figures

FIGURE 8. Borgesminthurinus andinus sp. nov.: head chaetotaxy.

FIGURES 1‒7. Borgesminthurinus andinus sp. nov.: 1, Ant. IV; 2, Ant. I‒III; 3, Ant. organ III; 4, labrum; 5, labial palp; 6, labium and maxillary palp; 7, maxilla.

FIGURES 9‒12. Borgesminthurinus andinus sp. nov.: 9, Tita. I; 10, Tita. II; 11, leg III; 12, ungues and empodial appendage I, anterior view.

FIGURE 13‒15. Borgesminthurinus andinus sp. nov.: 13, apex of Tita. III, ungues and empodial appendage; 14, retinaculum; 15, furcula.

FIGURE 16. Borgesminthurinus andinus sp. nov.: great and lesser abdomen chaetotaxy.

FIGURES 17‒18. Borgesminthurinus andinus sp. nov.: 17, lesser abdomen chaetotaxy; 18, genital and anal plates of female.

FIGURES 19‒20. Borgesminthurinus andinus sp. nov.: 19, habitus; 20, head.

FIGURES 23‒24. Borgesminthurinus andinus sp. nov., SEM photo: 23, ventral view of complete body; 24, dorsal view of head and thorax I-III.

FIGURES 25‒26. Borgesminthurinus andinus sp. nov., SEM photo: 25, Ant. III papilla; 26, apex of Ant. IV.

FIGURES 27‒28. Borgesminthurinus andinus sp. nov., SEM photo: 27, ocular area, with cornea and intraocular setae taken from obtuse angle; 28, mouth in frontal view, with labrum, mandible, maxillary palps, labium and labial palps.

FIGURES 29‒30. Borgesminthurinus andinus sp. nov., SEM photo: 29, apex of tibiotarsus I; 30, apex of tibiotarsus III.

FIGURES 31‒32. Borgesminthurinus andinus sp. nov., SEM photo: 31, lateral view of great abdomen with trichobothria; 32, lateral view of Abd. IV to VI and furcula.