Eotetranychus, Oudemans, 1931

Gotoh, Tetsuo & Arabuli, Tea, 2019, New species of the genus Eotetranychus (Acari, Prostigmata, Tetranychidae) from Japan, Zootaxa 4555 (1), pp. 1-27 : 23-25

Key to the Japanese species of the genus Eotetranychus (including species groups)

1 Striae of genital flap in female entirely transverse; pregenital striae various........................................ 2 - Striae of genital flap in female longitudinal on anterior portion and transverse on posterior portion; pregenital striae longitudi- nal........................................................................ sexmaculatus species group...24 2 Pregenital striae in female entirely transverse.......................................... willamettei species group...4

- Pregenital striae in female not entirely transverse, or not transverse at all.......................................... 3

3 Pregenital striae in female longitudinal................................................ hicoriae species group...14

- Pregenital striae in female irregular (note: striae can be mostly transverse with some oblique).... pallidus species group...20

4 Tibia II in female with 7 tactile setae................................................................. uchidai

- Tibia II in female with 8 tactile setae...................................................................... 5

5 Male spinneret as long as wide and subconical or up to 2 times as long as wide..................................... 6

- Male spinneret at least 2.5 times as long as wide............................................................ 11

6 Male spinneret as long as wide, subconical................................................................. 7

- Male spinneret about 2 times as long as wide................................................ carpinicolus sp. nov.

7 Aedeagus bent vertically approximately half way along shaft, more or less linear without a distinct terminal knob......... 8

- Aedeagus bent vertically along shaft with a distinct terminal knob.............................................. 10

8 Aedeagus shaft evenly tapering to a truncate or blunt tip....................................................... 9

- Aedeagus shaft abruptly tapering at extreme tip to form a short, fine, dorsally-curved tip................ linderae sp. nov.

9 Aedeagus bent ventrally half way along shaft, with ventrally directed portion straight and weakly tapering to truncate tip................................................................................................. cornicola

- Aedeagus bent ventrally approximately half way along shaft, with ventrally directed portion weakly sigmoid and tapering to blunt tip......................................................................................... lewisi

10 Terminal knob of aedeagus large (ca. 5µm); anterior projection minute, acute, triangular; posterior projection elongate, main axis parallel with shaft, curving dorsally, tapering to blunt tip......................................... broussonetiae

- Terminal knob of aedeagus small (ca. 2.5µm); anterior projection an inconspicuous angulation, almost absent; posterior projection with a blunt posterior tip.................................................................... geniculatus

11 Aedeagus posteriorly directed, extremely elongate, narrow, linear, weakly tapering to blunt tip.................. tiliarium

- Aedeagus posteriorly directed, elongate, not completely linear, with some discernible undulation in proximal third to half.. 1 2

12 Aedeagus posteriorly directed, elongate, narrow almost linear, weakly undulate in proximal third, weakly tapering to blunt tip; tibia I in male with 9 tactile setae and 3 solenidia........................................................ querci

- Aedeagus posteriorly directed, elongate, narrow, strongly undulate in proximal half, weakly tapering to blunt tip; tibia I in male with 9 tactile setae and 2 solenidia................................................................... 13

13 Female peritreme with short simple bend at distal end, like golf club; female palpus with spinneret less than twice as long as wide............................................................................................. pruni

- Female peritreme with short recurved hook distally; female palpus with spinneret approximately twice as long as wide..................................................................................................... uncatus

14 Female palpus with spinneret approximately twice as long as wide; aedeagus with distal portion ventrally directed....... 15

- Female palpus with spinneret approximately 1.5 times as long as wide; aedeagus posteriorly directed, with undulating shaft, strongly tapering to fine tip.......................................................................... smithi

15 Aedeagus with distal portion ventrally directed and weakly sigmoid............................................ 16

- Aedeagus with distal portion ventrally directed and straight................................................... 19

16 Aedeagal shaft with dorsal margin undulate, proximal ventral margin strongly convex, distal portion ventrally directed and sigmoid............................................................................................... 17

- Aedeagal shaft with dorsal margin straight, proximal portion of ventral margin gently convex, distal portion ventrally directed sigmoid............................................................................................ 18

17 Setae sc 1 longer (± 120µm); setae c 1 and c 2 longer (± 110µm).......................................... tiliaecola a)

- Setae sc 1 shorter (<120µm); setae c 1 and c 2 shorter (<110µm)........................................ tsugaruensis a)

18 Female empodia I–IV with distinct mediodorsal spur.................................................. rubricans

- Female empodia I–IV without mediodorsal spur.................................................... quercifoliae

19 Aedeagus with distal portion bent ventrad at a right angle (i.e. ventral margin of aedeagus forming a right angle).. spectabilis

- Aedeagus with distal portion bent ventrad at an approximately 40° angle (i.e. ventral margin of aedeagus forming an obtuse angle)....................................................................................... toyoshimai

20 Tibia II in female with 7 tactile setae................................................................. boreus

- Tibia II in female with 8 tactile setae..................................................................... 21

21 Aedeagal shaft with proximal portion of ventral margin gently to strongly convex, distal portion of shaft ventrally directed and weakly sigmoid...................................................................................... 22

- Aedeagus shaft with proximal portion of ventral margin weakly convex to undulating, distal portion bent ventrad at an approximately 40° angle (i.e. ventral margin of aedeagus forming an obtuse angle)........................ palatiensis sp. nov.

22 Female opisthosoma with dorsocentral setae noticeably longer than distances to bases of setae in next row; female palpus with spinneret approximately twice as long as wide.............................................................. 23

- Female opisthosoma with dorsocentral setae approximately as long as distances to bases of setae in next row; female palpus with spinneret 2.5 times as long as wide.......................................................... suginamensis

23 Tip of aedeagus is much longer than the ventral margin of shaft.............................................. celtis

- Tip of aedeagus is shorter than the ventral margin of shaft............................................... nomurai

24 Female palpus with spinneret at least twice as long as wide; aedeagus with distal portion bent ventrad at an approximately 40° angle (i.e. ventral margin of aedeagus forming an obtuse angle)................................................ 25

- Female palpus with spinneret approximately as long as wide; aedeagus linear, tapering distally to blunt tip......... dissectus

25 Male palpus with minute subconical spinneret; aedeagus with ventrally directed distal portion with truncate tip..... asiaticus

- Male palpus with subcylindrical spinneret; aedeagus with ventrally directed distal portion tapering to fine tip, and extreme tip slightly upcurved................................................................................ kankitus