Scapheremaeus

Colloff, Matthew J., 2010, The hyperdiverse oribatid mite genus Scapheremaeus (Acari: Oribatida: Cymbaeremaeidae) in Australia, with descriptions of new species and consideration of biogeographical affinities, Zootaxa 2475, pp. 1-38 : 32-33

Key to Australian species of Scapheremaeus

1 With no circumdorsal suture or circumnotogastral plate; seven pairs of notogastral setae............................................ .............................................................................................................. Euthemellus species-group: S. walteri sp. nov.

- With complete circumdorsal suture and plicate circumnotogastral plate; with nine or ten, thirteen or fourteen pairs of notogastral setae............................................................................................................................................................ 2

2 With thirteen or fourteen pairs of notogastral setae: five pairs on centrodorsal plate (three pairs d series of, plus lm and lp) ..................................................................................................................................... Patella species-group...3

- With nine or ten pairs of notogastral setae; two pairs on centrodorsal plate ................................................................ 4

3 Humeral process massive, elongated, lobe-shaped; centrodorsal region alveolate; lamellar apophyses elongated; with fourteen pairs of notogastral setae and five pairs of genital setae .......................................... S. tegulatus sp. nov.

- Humeral process absent, centrodorsal region ridged; lamellar setae on short tubercles; with thirteen pairs of notogastral setae and six pairs of genital setae ................................................................................................ S. baylyi sp. nov.

4 Prodorsum with lateral carinae; circumdorsal suture with diagonal extensions in humeral region ............................... ............................................................................................................................................Carinatus species-group...5

- Lateral carinae absent; circumdorsal suture without diagonal extensions in humeral region ........................................ ........................................................................................................................................... Petrosus species-group…14

5 With nine pairs of notogastral setae (p 3 absent) and two pairs of adanal setae (ad 3 absent) ........................................ 6

- With ten pairs of notogastral setae (three pairs in p series) and three pairs of adanal setae......................................... 8

6 Costulae short, converging anteriomedially, separated from tubercles of lamellar setae; well-developed transbothridial ridge present; centrodorsal microsculpture consisting of tubercles arranged in lines forming a tessellated pattern. ......................................................................................................................................................... S. alisonae sp. nov.

- Costulae long, more-or-less parallel, with tubercles of lamellar setae at their apices; transbothridial ridge absent or poorly-defined, but with faint median transcostular ridge; centrodorsal microsculpture foveolate/alveolate.............. 7

7 Centrodorsal region with closely-spaced foveolae anteriorly and irregular transverse ridges bearing small tubercles posteriorly; dorsal circumnotogastral plate of consistent width laterally and caudally; carinae consisting of short, lateral extensions from bases of tubercles of setae le ............................................................................. S. nivalis sp. nov.

- Centrodorsal region covered with large, shallow, sparsely-distributed alveoli; dorsal circumnotogastral plate much narrower caudally than laterally; carinae present as a pair of well-developed lateral ridges ......... S. zephyrus sp. nov.

8 Lamellar setae on elongated apophyses at least twice as long as broad; microsculpture of centrodorsal region consisting of broadly-spaced large tubercles, markedly broader than tubercles of dorsal setae ........................................ 9

- Lamellar setae on short tubercles no longer than broad; centrodorsal region with small tubercles as wide or narrower than tubercles of dorsal setae, or with plaques, foveolae or ridges............................................................................. 10

9 Lamellar apophyses broadened basally, extending mid-way between translamellar ridge and rostrum; head of sensillus smooth as rostrum; head of sensillus spinose .............................................................................. S. allmani sp. nov.

- Lamellar apophyses not broadened basally, extending mid-way between translamellar ridge and rostrum; head of sensillus smooth ........................................................................................................................ S. tuberculosus sp. nov.

10 Microsculpture of centrodorsal region with small tubercles as wide or narrower than tubercles of dorsal setae ...... 11

- Microsculpture of centrodorsal region with plaques, foveolae or ridges ................................................................... 12

11 Centrodorsal region with sparse, small tubercles; posterior region with lateral concavities; caudal margin rounded... ............................................................................................................................................... S. lambieae Colloff, 2009

- Centrodorsal region of fine tubercles in lines; posterior region without lateral concavities; caudal margin indented .. ............................................................................................................................................ S. cheloniella Colloff, 2009

12 Centrodorsal region with elongate, transverse, sub-parallel ridges; setae of p series on ventral circumnotogastral plate ............................................................................................................................................. S. ewani Colloff, 2009

- Microsculpture of centrodorsal region with plaques, foveolae or ridges; setae of p series on dorsal circumnotogastral plate............................................................................................................................................................................. 13

13 Centrodorsal region with elongated plaques; interbothridial region with diagonal cross-shaped ridges ....................... .................................................................................................................................................. S. pulleni Colloff, 2009

- Centrodorsal region with scattered minute foveolae; interbothridial region with rugose pattern of poorly-defined ridges .......................................................................................................................................... S. angusi Colloff, 2009

14 Sensillus massive, bulbous, with longitudinal striae; caudal margin strongly crenellated, irregular ............................. ............................................................................................................................................ S. bulbosensillatus sp. nov.

- Sensillus not massive and bulbous; smooth or tuberculate, but without longitudinal striae; caudal margin smooth or with a few projecting plications .................................................................................................................................. 15

15 Costulae well-defined, with anterior transcostular ridges and posterior interbothridial ridges forming trapezoid shape .................................................................................................................................................................................... 16

- Costulae diffuse, without interbothridial ridge .......................................................................... S. minjambuta sp. nov.

16 Centrodorsal region with elongate, thin, irregular median ridge with transverse lateral ridges; setae of c and l series on raised verrucae ................................................................................................................. S. notoverrucatus sp. nov

- Centrodorsal region with irregular transverse ridges and foveolae; setae of c and l series not on raised verrucae ... 17

17 Rostrum transverse; sensillus tuberculate; lenticulus wedge-shaped, longer than broad ............. S. truncatus sp. nov.

- Rostrum rounded; sensillus smooth; lenticulus oval, broader than long ................................... S. euthemellus sp. nov.