Blattisociidae

Lindquist, Evert E. & Moraza, Maria L., 2010, Revised diagnosis of the family Blattisociidae (Acari: Mesostigmata: Phytoseioidea), with a key to its genera and description of a new fungus- inhabiting genus from Costa Rica, Zootaxa 2479, pp. 1-21 : 3-4

Key to the world genera of family Blattisociidae

1. Legs II-IV with median lobe of pulvillus broadly rounded; paranal setae inserted anterior to hind margin of anus, and usually at least slightly shorter than postanal seta; femora I and II usually with 12 and 11 setae, respectively (v -3 usually present); anterior hypostomatic seta and internal palptrochanter seta gradually tapering along entire length, not whip-like, usually not elongated Subfamily Blattisociinae ................................................................................... 2

- Legs II-IV with median lobe of pulvillus slender, acute or narrowly rounded; paranal 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 v -3); anterior hypostomatic seta and internal palptrochanter seta long, whip-like, tapering only near tip Subfamily Platyseiinae ................................................................................................................................ 10

2. Leg II of female often thickened, with strong, opposable spine-like setae on ventral surface of femur, genu, tibia and tarsus; fixed digit of chelicera multidentate, its distal extremity usually with enlarged rounded margin bearing a row of small rasping teeth; trochanter I with 4 or 5 setae (av -1 absent), genu and tibia I each with maximum of 11 setae (pd -3, av -2 absent) ................................................................................................................ Hoploseius Berlese 1914

- Leg II of female not thickened, without spine-like ventral setae; fixed digit of chelicera with few to many teeth, its distal extremity not enlarged, without row of small teeth; trochanter I with 6 setae (av -1 present); genu and tibia I each with 12 or 13 setae (pd -3 and usually av -2 present) ............................................................................................ 3

3. Corniculi narrowly separated, usually slender; anterior margin of gnathotectum convex, smooth; fixed digit of chelicera with few or no teeth; peritrematal shield slender, barely wider than stigma at level of stigma; female with humeral seta r3 usually on soft cuticle beside dorsal shield; protonymph with 2 setae on palptrochanter .................. 4

- Corniculi well separated, stout; anterior margin of gnathotectum convex or triramous, smooth or denticulate; fixed digit of chelicera usually with many teeth; peritrematal shield clearly wider than diameter of stigma at level of stigma; female with humeral seta r3 on dorsal shield; protonymph with usually 1 seta on palptrochanter ................ 5

4. Dorsal shield without midlateral incisions; opisthonotal region of dorsal shield holotrichous, with 15 pairs of setae; fixed digit of chelicera well developed or reduced; female without isolated metasternal plates; leg IV of male without enlarged, spine-like setae. Blattisocius Keegan 1944 (including Paragarmania Nesbitt 1951 , sensu Karg 1991)

- Dorsal shield with midlateral incisions; opisthonotal region of dorsal shield hypotrichous, with 12 pairs of setae (lacking a pair in each of J, Z, S series); fixed digit of chelicera well developed; female with isolated metasternal plates; leg IV of male with several enlarged, ventral spine-like setae ................ Adhaerenseius Loots & Theron 1992

5. Female and male with 11 pairs of marginal r -R setae on edge of dorsal shield, opisthonotal region of shield with 20 pairs of setae; rows of deutosternal denticles narrow, each with 2 to 4 denticles .......................................................... ................................................................................................................................ Orthadenella Athias-Henriot 1973

- Female and male with 1 to 9 pairs of marginal r -R setae on soft cuticle beside dorsal shield, opisthonotal region of shield with maximum of 15 pairs of setae in female, 17 pairs in male; rows of deutosternal denticles moderately wide, each with 5 to many denticles .......................................................................................................................... 6

6. Dorsal shield with 18 to 23 pairs of setae, lacking both podonotal setae z3, z6, r2 and opisthonotal setae J1-J3, and Z1 or S1; dorsal shield with humeral setae r3 more or less erect, attenuated and undifferentiated in form from neighboring setae, simple or weakly barbed; genua of legs II and III with 10 and 8 setae, respectively, lacking pv -1; female ventrianal shield weakly sclerotized, unornamented, with 2 to 4 pairs of opisthogastric setae ................................. 7

- Dorsal shield with 23 to 38 pairs of setae, not lacking the above combination of setae and never lacking setae J1, J2, Z1; dorsal shield with humeral setae r3 distinctively erect, its form (usually bushy or setulose or weakly to strongly

tricarinate) more or less in contrast to inclined neighboring setae; genua of legs II and III usually with 11 and 9 setae, respectively, pv -1 usually present; female ventrianal shield usually well sclerotized and ornamented, usually with 4 to 6 pairs of opisthogastric setae ................................................................................................................................ 8 7. Legs I to IV greatly elongated, I and IV two to three times as long as dorsal shield; legs II to IV with tarsi greatly elongated, over three times as long as the tibial segments; dorsal shield with 15 pairs of podonotal setae, j1, s1, s2, s5 present; male with sternitigenital shield incised between sternal and genital regions, and not connected with endopodal fragments between coxae III-IV; male lacking any R - marginal setae, and with small ventrianal shield, its anterolateral margins remote from peritrematal/exopodal plates behind coxae IV; movable digit of female and nymphal chelicera multidentate, and with two grooves along paraxial surface ....................................... Opilioseius gen. nov.

- Legs I to IV moderately elongated, I and IV at most 1.5 times as long as dorsal shield; legs II to IV with tarsi about 2.5 times as long as the tibial segments; dorsal shield with 11 pairs of podonotal setae, j1, s1, s2, s5 absent; male with sternitigenital shield normally developed, not incised laterally, and fully integrated with endopodal strips alongside coxae III-IV; male with one pair of R -marginal setae, and with well developed ventrianal shield, its anterolateral margins abutting peritrematal/exopodal plates behind coxae IV; movable digit of female and nymphal chelicera quadridentate, lacking grooves along paraxial surface .............................................................. Aceodromus Muma 1961

8. Adults with 3 to 10 pairs of marginal (r -R) and submarginal (UR) setae on soft lateral cuticle; female metapodal plates free on soft cuticle, female ventrianal shield with 6 or fewer pairs of setae in addition to circumanals; male usually with separate sternitigenital, ventrianal, and peritrematal-exopodal shields ............ Lasioseius Berlese 1916

- Adults with one pair of marginal setae (R1) on soft lateral cuticle; female metapodal plates incorporated into either ventrianal or peritrematal shields, female ventrianal shield with 7 pairs of setae in addition to circumanals; male with holoventral shield ....................................................................................................................................................... 9

9. Podonotal region of dorsal shield lacking setae z1, s1, s2; female with paragenital poroids on posterolateral corners of strongly widened epigynal shield, and with metapodal plates incorporated into anterolateral corners of ventrianal shield; male with 7 pairs of opisthogastric setae on ventrianal shield area; genu III with 10, tibia III with 9, and tibia IV with 10 setae (pl -2 present on each) ............................................................................... Zercoseius Berlese 1916

- Podonotal region of dorsal shield holotrichous, setae z1, s1, s2 present; female with paragenital poroids on soft cuticle abutting posterolateral corners of widened epigynal shield, and with metapodal plates incorporated into posterior margins of peritrematal shields; male with 4 pairs of opisthogastric setae on ventrianal shield area; genu III with 9, tibia III with 8, and tibia IV with 9 setae (each lacking pl -2) ....................... Arrhenoseius Walter & Lindquist 2001

10. Opisthonotal region of dorsal shield markedly hypotrichous, with only 5 pairs of setae; female lacking metasternal plates and with anal shield; male lacking sternal setae st4; median lobes of pulvillus of legs II-IV blunt; genu II with 9 setae (pl -2 absent) ............................................................................................ Cheiroseiulus Evans & Baker 1991

- Opisthonotal region of dorsal shield with 12 to 14 pairs of setae; female with metasternal plates and ventrianal shield; male usually with sternal setae st4; median lobes of pulvillus of legs II-IV acute; genu II with 10 setae (pl -2 present) ..................................................................................................................................................................... 11

11. Opisthonotal region of dorsal shield with 2 to 4 pairs of setae in J series; sternal setae st1 distinctly shorter than st3; tibia II with 9 setae (pd -1 absent); distance between fifth and sixth rows of deutosternal denticles nearly twice that between fourth and fifth rows ................................................................................................ Platyseius Berlese 1916

- Opisthonotal region of dorsal shield with 5 pairs of setae in J series; sternal setae st1 and st3 subequal in length; tibia II with 10 setae (pd -1 present); distance between fifth and sixth rows of deutosternal denticles similar to or only slightly greater than that between fourth and fifth rows ..................................................... Cheiroseius Berlese 1916