Gustavia, Kramer, 1879

Revelo-Tobar, Harol, Estrada-Venegas, Edith G. & Martinez, Armando Equihua, 2022, New records of oribatid mites from Mexico with description of a new species, Zootaxa 5168 (1), pp. 24-38 : 35-36

Keys for species of the genus Gustavia (Updated from Pérez-Íñigo 1987, 1997)

Gustavia magnilamellata (Ewing, 1909) (= Serrarius connexus Berlesle, 1916 ), Gustavia parvula (Banks, 1909) and Gustavia rugosa Balogh, 1958 were not included in this key because their descriptions do not provide sufficient information on their morphology.

1 Sejugal suture present.................................................................................. 2

- Sejugal suture absent.................................................................................. 4

2 Translamella absent............................................ Gustavia mexicana sp. nov. Distribution: Mexico.

- Translamella present................................................................................... 3

3 Setae barbulate; in smooth; translamella with deep depression; fusiform sensillum, thin head covered with short spines...................................... Gustavia magnifica Golosova & Karppinen, 1984 . Distribution: East Asian Russia.

- le setae smooth; in slightly barbed; depression of translamella slightly deep; sensillum fusiform, head widened and smooth.................................................... Gustavia latolamellata Hammer, 1977 . Distribution: Pakistan.

4 Translamella absent................................................................................... 5

- Vestigial, incomplete or absent translamellae.............................................................. 10

5 Rostrum with pointed or rounded end..................................................................... 6

- Rostrum not pointed or rounded, concave in center........................................................... 7

6 Setas in slightly barbed, lamellae considerably broad; rostrum slightly elongated and broad; apophyses adjacent to rostrum broad and evident................................... Gustavia transylvanica Mahunka, 2006 . Distribution: Romania.

- Setae in smooth setae; lamellae narrowly flared; rostrum elongated, ending in a point and with narrow, inconspicuous apophyses............................ Gustavia maior (Berlese, 1903) (= Gustavia microcephala longirostris Mihelčič, 1957 ). See description and diagrams in: ( Pérez-Íñigo 1997). Distribution: Mediterranean.

7 Short rostrum, barely projecting beyond the lamellar cusps ……………………………………………………….……… Gustavia microcephala (Nicolet, 1855) (= Gustavia sol Kramer, 1879 ). See description and diagrams in: ( Pérez-Íñigo 1997). Distribution: Palearctic (frequent), Eastern and Mexico?

- Rostrum elongate, projecting beyond lamellar cusps.......................................................... 8

8 Rostrum and translamella with deep depression............. Gustavia aethiopica Mahunka, 1982 . Distribution: Ethiopic.

- Rostrum and translamella straight........................................................................ 9

9 Long lamellar cusps; sensillum with short spines covered head..................... Gustavia longicornis (Berlese, 1903) . See description and diagrams in: ( Pérez-Íñigo 1997). Distribution: Mediterranean and Oriental.

- Short lamellar cusps; sensillum with elongated head equal to half its length, with a few setae at the end........................................ Gustavia fusifer (Koch, 1841) (= Neozetes bicornis Berlese, 1885 ; = Oribata globula Koch, 1841 ). See description and diagrams in: ( Pérez-Íñigo 1997). Distribution: Western Palearctic.

10 Long modified gnathosoma, almost as long as rostral Setae................................................... 11

- Short modified gnathosoma, hidden under the rostral tectum.................................................. 12

11 Lamellar cusps shorter than lamellae width; sensillum head covered distally with small spines; setae p1, p2 and p3 present...................................................... Gustavia ornata Mahunka, 2011 . Distribution: Madagascar.

- Lamellar cusps longer than the width of the lamellae; sensillum head covered distally with 2–3 short spines and very long setiform termination; setae p1 long, p2 and p3 represented only by alveoli............................................................................................ Gustavia sineornata Mahunka, 2011 . Distribution: Madagascar.

12 Translamella absent; lanceolate sensillum..................... Gustavia aominensis Fujikawa, 2008 . Distribution: Japan

- Incomplete translamella; fusiform sensillum.............................................................. 13

13 Setae in long, almost reaching the anterior end of the setae le; sensillum lanceolate, with very small spines on the head; p1 setae very long, setae p2 and p3 setae absent, represented by alveoli............................................................ Gustavia longiseta Mahunka, 1984 . See description and diagrams in: ( Ermilov et al. 2013). Distribution: Ethiopic

- Setas in short, barely reaching the insertion points of the setae le; sensillum fusiform; setae p1, p2 and p3 present, setiform and short.................................................................................................. Gustavia oceanica Pérez-Íñigo, 1987 . Distribution: Southern Palearctic (western Mediterranean) and Eastern ( India: West Bengal, and Philippines)