Ascidae, Viogts and Oudemans, 1905

Keum, Eunsun, Kaczmarek, Sławomir & Jung, Chuleui, 2016, A new record of Antennoseius avius (Karg, 1976) (Acari: Mesostigmata; Ascidae) from Korea, Journal of Species Research 5 (3), pp. 375-380 : 377-379

Key to the World Genera of Ascidae adopted from Halliday et al. (1998)

1. Dorsal shield of deutonymph and adult completely divided in two ······························································ 2

- Dorsal shield of deutonymph and adult entire, lateral incisions of deutonymphal shield retained or lost adult ··················································································· 8

2. Opisthonotal shield with 12 pairs of setae (J 3, Z 2, S 1 absent); podonotal shield lacking setae j 2, z 1, z 3; adult leg setation strongly neotenous, genua I­II­III­ IV with 11­8­7­7 setae, tibiae with 11­7­7­7 setae; female with anal shield ····································· Diseius

- Opisthonotal shield with 15 or more pairs of setae (J 3, Z 2, S 1 present); podonotal shield with setae j 2, z 3, sometimes z 1; adult leg setation not strongly neotenous, minimum number of setae on genua 12­11­8­ 8, on tibiae 13­10­8­9; female with anal or ventri­anal shield ········································································ 3

3. Hypostome with corniculi bifid apically; anterior rostral setae thickened, spinelike; dorsal­shield setae z1 absent; female with oval anal shield bearing circum­anal setae only; male leg II conspicuously different from female, with a least one greatly thickened, spine­like seta on femur and tarsus ·········· Anephiasca

- Hypostome with corniculi entire apically; anterior rostral setae of similar thickness to other hypostomal setae; dorsal­shield setae z 1 present or absent; female with ventri­anal or subtriangular anal shield; male leg II similar to that of female, without spine­like setae ··················································································· 4

4. Leg I usually without pretarsus and claws; female with subtriangular ventri­anal shield bearing 1 or 2 pairs of setae in addition to the circum­anal setae or with anal shield, and with epigynial shield strongly rounded posteriorly; male with ventri­anal shield united to peritrematic shields; deutonymph with anal shield; much of soft body cuticle often with microtubercules superimposed on striae ······························ 5

- Leg I with pretarsus and claws; female with ventri­anal shield variously shaped (but not subtriangular) bearing 3­6 pairs of setae in addition to circum­anal setae, and with epigynal shield truncate posteriorly; male with ventri­anal shield separate from peritrematic shields; deutonymph with ventri­anal shield; soft body cuticle striate, without microtubercles ············ 6

5. Palps slender, elongated, at least half as long as leg I; palp trochanter longer than femur; palp tibia almost 3 times as long as tarsus; sternal shield lacking lyrifissures iv1, iv3, and sometimes iv2; tibia IV with nine setae(pl ­2 absent) ··································· Anystipalpus

- Palps of normal length, about one­third as long as leg I; palp trochanter slightly shorter than femur; palp tibia twice as long as tarsus; sternal shield lyrifissures iv 1­ iv3 present; tibia IV with ten setae (pl ­2 present) ································································ Antennoseius

- Leg I with pretarsus and a pair of small to well­developed claws ························· Antennoseius (Vitzthumia)

- Leg I lacking pretarsus and claws ······························· ······································· Antennoseius (Antennoseius)

6. Opisthonotal shield with setae Z 4 and S 5 usually approximal and inserted together on pair of prominent posterolateral tubercles; potonotal shield lacking setae z 1, and with j 2 well behind level of j 1; peritrematic shields of adults broad, truncate posteriorly; genu I with 12 setae (av ­2 absent) ································· Asca

- Opisthonotal shield with setae Z 4, S 5 well separated, not borne on pair of strong tubercles; podonotal shield with setae z 1 present; j 2 tending to be displaced anteriorly, often in approximately transverse row with z 1 and j 1; peritrematic shields of adults narrow or of moderate width, tapering posteriorly; genu I with 13 setae (av ­2 present) ··················································· 7

7. Podonotal shield with transverse line extending completely across surfac at level of setae z 6, opisthonotal shield with similar line at level of setae J 1; para­anal setae inserted closer to anterior margin of anus than posterior margin; genu IV with 8 setae (pl ­1 absent); tibia IV with 9 setae (pl ­2 absent) ··· Protogamasellus

- Dorsal shields without transverse lines extending completely across surface; para­anal setae inserted closer to posterior margin of anus than to anterior; genu IV with 9 setae (pl ­1 present); tibia IV with 10 setae (pl ­2 present) ······························· Gamasellodes

8. Leg II­IV with median lobe of pulvillus slender, acute or narrowly rounded; para­anal setae inserted level with or posterior to hind margin of anus, and usually longer than post­anal seta; femora I and II with 11 and 10 setae, respectively (each lacking v­3); anterior rostral and internal palp trochanter setae extremely long, whip­like, tapering only near tip ······························ 9

9. Opisthonotal region of dorsal shield markedly hypotrichoous, with only 5 pairs of setae; female lacking metasternal shields and with anal shield; male lacking metasternal setae; median lobes of pulvillus of legs II­IV blunt; genu II with 9 setae (pl ­2 absent) ················· ······························································· Cheiroseiulus