Dyobelba

Bayartogtokh, Badamdorj & Norton, Roy A., 2007, The Dyobelba tectopediosa species-group (Acari: Oribatida: Damaeidae) from the Southeastern USA, with a key to world species of Dyobelba and notes on their distribution, Zootaxa 1591, pp. 39-66 : 65-66

Key to adults of world species of Dyobelba

1. Epimeral neotrichy present, i.e. epimere II with three pairs of setae .......................................................... 2

- Epimeral neotrichy absent, i.e. epimere II with one pair of setae................................................................ 3

2. Trochanter IV with 2 setae; femora III and IV each with 4 setae; enantiophyses B, D, E2, V and discidium absent; sensillus flagellate ( Korea) ......................... D. paucituberculata Bayartogtokh, Choi & Aoki, 2001

- Trochanter IV with 1 seta; femora III and IV each with 5 setae; prodorsal tubercle Ba, ventral tubercle E2a, and discidium present; sensillus not flagellate, nearly straight distally ( China, Mongolia) ................. ............................................................................................................... D. biclavata Wang & Norton, 1993

3. Propodolateral apophysis P present (species of the Appalachian region and southeastern USA) .............. 4

- Propodolateral apophysis P absent (species with other distribution) .......................................................... 9

4. Prodorsum without alveolate sculpturing; prodorsal enantiophysis D and epimeral enantiophysis E2 present; leg IV almost twice the ventral body length, femur about twice length of trochanter..................... ....................................................................................................................... D. carolinensis ( Banks, 1947)

- Prodorsum with alveolate sculpturing; enantiophyses D and E2 absent; leg IV only slightly longer than ventral body length, femur IV about same length as trochanter ( tectopediosa group)................................ 5

5. Notogastral setae (except p row) directed radially, smooth, most nearly straight. Sensillus flagellate, with shepherd’s crook bend ....................................................................................... D. tectopediosa Jacot, 1938

- Notogastral setae (except p row) directed anteriorly (c row) or posteriorly (l, h rows), noticeably barbed, most noticeably curved. Sensillus of various shapes................................................................................... 6

6. Sensillus finely attenuate but relatively short, tip flexible but without shepherd’s crook bend; dorsosejugal region without alveolae, but with pair of irregular and variable small ridges; central prodorsal swellings alveolate and without tubercle Aa................................................................................... D. behanae sp. nov.

- Sensillus flagellate, with shepherd’s crook bend; dorsosejugal region alveolate; prodorsal swellings various................................................................................................................................................................ 7

7. Prodorsal tubercle Aa absent; propodolateral apophysis strongly projecting anterolaterally; spinae adnatae minute, little longer than lyrifissure ia .......................................................................... D. crossleyi sp. nov.

- Prodorsal tubercle Aa present; propodolateral apophysis weaker, not distinctly projecting; spinae adnatae small to moderate sized, but at least twice the length of ia ......................................................................... 8

8. Alveolae continuous across mid-level of prodorsum, including central prodorsal swellings; with dark transverse line at level of rostral setae in transmitted light; notogastral setae only slightly swollen in middle region; femora I and II with strong, nearly circumferential ridge basally .................. D. dindali sp. nov.

- Alveolae incomplete medially on prodorsum, absent from central prodorsal swellings; without transverse line at level of rostral setae in transmitted light; notogastral setae broader, flame-shaped; femora I and II with normal, simple structure ...................................................................................... D. granulata sp. nov.

9. Sensilli very long, flagellate; notogastral setae barbed ( Japan) .......... D. kushiroensis Enami & Aoki, 2001

- Sensilli short¸ not flagellate; notogastral setae smooth ............................................................................. 10

10. Prodorsal enantiophyses B, D and ventral enantiophyses E2, V completely developed; anterior parastigmatic tubercle Sa and discidium blunt or rounded at tip; spinae adnatae absent; setae d present on tibia II ( Chile) ...................................................................................................................... D. armata Norton, 1979

- Prodorsal tubercle Bp, enantiophysis D and ventral enantiophysis E2 absent; anterior parastigmatic tubercle Sa and discidium sharply pointed at tip; spinae adnatae well developed; seta d absent from tibia II (New Hampshire, USA) ....................................................................... D. reevesi Norton & Ryabinin, 1994