Crotonia

Colloff, Matthew J., 2015, The Crotonia fauna of New Zealand revisited (Acari: Oribatida): taxonomy, phylogeny, ecological distribution and biogeography, Zootaxa 3947 (1), pp. 1-29 : 17

Key to species of Crotonia from New Zealand (including Campbell Island)

This key applies to males and females.

1. Caudal apophyses f 1, h 1, h 2 and h 3 short, only slightly longer than wide, subequal in length, projecting dorsally from rounded caudal margin............................................................ Lanceolata group… C. brevicornuta

- With caudal apophyses not as above....................................................................... 2

2. Caudal apophyses bilaterally separated, h 2 2–5 × longer than other caudal setae.................... Cophinaria group...3

- With caudal apophyses on median stalk or, if separate, h 2 not markedly longer than others............................ 4

3. Caudal apophyses of seta h 2 long, ca. 4–5´length of that of h 1........................................ C. cophinaria

- Caudal apophyses of seta h 2 short, ca. 2´length of that of h 1....................................... C. brachyrostrum

4. Notogastral margins discrete; suprapleural suture (hyaline strip) present.......................................... 5

- Notogastral margins diffuse, suprapleural suture absent.......................................... Obtecta group…9

5. Notogastral shield narrow, sides parallel..................................................... Unguifera group…6

- Notogastral shield broad, sides convex, cuticle reticulate.............................. Flagellata group… C. reticulata

6. Suprapleural suture extending to point between setae e 2 and f 2........................................ C. cervicorna

- Suprapleural suture extending as far as seta f 2 or posterior thereof................................................ 7

7. Notogastral setae d 2-3, e 2 and f 2 relatively long; at least as long as half the distance between bases of adjacent setae................................................................................................... C. longisetosa

- Notogastral setae d 2-3, e 2 and f 2 very short; less than a quarter of the distance between bases of adjacent setae............. 8

8. Lamellar and caudal setae barbed................................................................ C. unguifera

- Lamellar and caudal setae smooth......................................................... C. ramsayi sp. nov.

9. Notogastral shield heavily tuberculate.......................................................... C. tuberculata

- Notogastral shield not heavily tuberculate................................................................. 10

10. Seta h 2 in cup-shaped apophysis.................................................................. C. cupulata

- Seta h 2 on apex of cylindrical or swollen apophysis.......................................................... 11

11. Apophysis of seta h 2 swollen apically............................................................ C. longibulba

- Apophysis of seta h 2 not swollen apically.................................................................. 12

12. Caudal apophyses on median stalk some distance from notogastral margin................................ C. caudalis

- Caudal apophyses not on median stalk, on notogastral margin........................................... C. obtecta