Oribatellidae, Jacot, 1925

Ermilov, Sergey G. & Behan-Pelletier, Valerie M., 2014, Revision of Fenestrobates (Acari, Oribatellidae) with description of F. marauni sp. nov., from South America, and new diagnosis for Oribatellidae, Zootaxa 3827 (2), pp. 258-272 : 270

Key to genera of Oribatellidae

1. Rostral setae spinose. Tutorium without cusp ( Bernini 1983, Fig. 2 ), not extending anterior of rostral seta...... Siciliotrichus

- Rostral seta setose with large barbs. Tutorium with cusp, extending anterior of rostral seta........................... 2

2(1) Interlamellar pocket large, box-like, reaching posterior of dorsosejugal scissure. Medial longitudinal ridge on coxisternum present.................................................................................... Ferolocella

- Interlamellar pocket present or absent, if present, never large, box-like, never reaching posterior of dorsosejugal scissure. Medial longitudinal ridge on coxisternum absent............................................................. 3

3(2) Notogastral setae lm positioned lateral to porose area Aa and lp positioned lateral to A1 (Behan-Pelletier 2013 Fig. 10 ). Dentes of lamellar cusps short and broadly tapered..................................................... Ophidiotrichus

- Notogastral setae lm positioned medial or posterior to porose area Aa and lp positioned lateral or anterior to A1. Dentes of lamellar cusps long and sharply tapered................................................................... 4

4(3) Lamellar cusp with ventral keel (Behan-Pelletier 2013 Fig. 2F ). Translamella without tooth...................... Joelia

- Lamellar cusp without ventral keel. Translamella with or without tooth........................................... 5

5(4) Notogastral cavities present ( Bernini 1975 Fig. 16b ). Custodium absent................................... Fberninia

- Notogastral cavities absent. Custodium present.............................................................. 6

6(5) Anterior margin of notogaster distinctly undulating with 5 or more fine ridges lateral of bothridium ( Behan-Pelletier 2011 Fig. 20A ). Pouch-like depression positioned ventrally between pedotectum I and the lateral body wall absent. Epimeral setae 1c and 4c present................................................................................ Oribatella

- Anterior margin of notogaster weakly undulating with no ridges lateral of bothridium. Pouch-like depression positioned ventrally between pedotectum I and the lateral body wall present ( Fig. 3 , 16 ). Epimeral seta 1c present or absent, 4c absent.............................................................................................. Fenestrobates

Figures

FIGURES 1–3. Fenestrobates marauni sp. nov., adult: 1—dorsal view; 2—ventral view (legs not illustrated); 3—lateral view. Scale bar 100 µm.

FIGURES 4–11. Fenestrobates marauni sp. nov., adult: 4—rostrum, dorso-anterior view; 5—anterior part of tutorium, lateral view; 6—subcapitulum, left half, ventral view; 7—palptarsus; 8—anterior part of chelicera; 9—pedotectum II, ventro-lateral view, epimeral seta 3c and basal part of leg II; 10—genital plate, left; 11—anal plate, left. Scale bars (4–6, 4–6, 8–11) 20 µm, scale bar (7) 10 µm.

FIGURES 16–20. Fenestrobates marauni sp. nov. Differential interference contrast microscope images of adult, 16–18: 16—lateral, showing pedotecta I and II (Pd I, Pd II), flask shaped depression (pdp), humerosejugal porose area Ah (four layers combined); 17—lamellae and posterior of prodorsum, showing dorsophragmata; 18—detail of notogastral integument and porose area Aa. Fenestrobates capucinus Balogh and Mahunka. Differential interference contrast microscope images of adult, 19, 20: 19—coxisternum, showing flask shaped indentation of pedotectum I seen in ventral aspect (four layers combined); 20—rostrum, lateral orientation, showing medial ridge, tutorium (tu) (specimen with ventral teeth), genal tooth, (three layers combined).