Occigamasus, Juvara-Balş, 2019

Juvara-Balş, Ilinca, 2019, Occigamasus, a new genus of pergamasine mites, with description of two new species from the west coast of North America (Parasitiformes: Gamasina: Parasitidae), Acarologia 59 (4), pp. 551-570 : 553

Occigamasus new genus

Zoobank: 06A18EF2-963A-4E10-AE3C-AF4E8C3E808E

Figs. 1–9

Type species — Occigamasus lindquisti n. sp.

Diagnosis — Dorsal shield of adult entire in female, with a median transverse suture between the podonotum and opisthonotum in male. Podonotum with 22 pairs of acicular, simple setae, slightly curved; setae s1 and s2 tiny (6–14). Opisthonotal region with 20–21 acicular, simple setae, their tips reaching the following row of setae. Dorsal adenotaxy with five gland pores: gdj2, gdz5, gds4, gdz6, gdZ3. Ventral adenotaxy with three pairs of gland pores: gv1 and gv3 with one solenostome, gv2 with two solenostomes; gv1 located closed to medial line of posterior margin of sternal shield or in vicinity of seta st3. Epigynium subapical structure spindle-like. Endogynium formed as a big sack which has various structures inside. Ventrianal shield with eight pairs of opisthogastric setae, ZV1 very short (6–7), JV5 inserted

on soft cuticle. Peritrematal shield free from ventrianal shield posteriorly and attached to podonotal region of holodorsal shield anteriorly.

Gnathotectum simply trifid. Hypognathal groove with 10–11 denticulate rows. Palpgenu with setae al1, al2 spatulate; palpfemoral seta al pectinate with four or more tines. Movable digit of female chelicera with four teeth, movable digit of male with two teeth; dorsal seta on fixed digit pilose. Trochanter IV, dorsally, with a small protuberance bearing a tiny spine at its apex ( Fig. 5E ).

Etymology — The name of the genus combines the Latin suffix “occi”-, from, “occidens – occido” meaning ‘west’, with - “gamasus”, referring to gamasine mites. It means the gamasus from the west.

Figures

Figure 1 Occigamasus lindquistin. sp., female: A–C, F. male: D, E. A, D – Podonotum; B, E – Opisthonotum; C – Submarginal setae UR on lateral cuticle; F – Opisthogaster.

Figure 2 Occigamasus lindquistin. sp., female: A – Sternal shield; B – Tritosternum; C – Paragynia and epigynium; D – Subapical structure of epigynium; Endogynium, E – dorsal view; F – ventral view.

Figure 3 Occigamasus lindquistin. sp., female: A–E. male: F. A – Gnathosoma, ventral view; B – Palpfemur and palpgenu; C, F – Gnathotectum; D – Chelicera; E – Dorsal seta of fixed digit.

Figure 4 Occigamasus lindquistin. sp., female: Leg II: A – Tarsus; B – Tibia and genu; C – Femur. Leg III: D – Tarsus; E – Tibia; F – Genu and femur; G – Trochanter.

Figure 5 Occigamasus lindquistin. sp., female: Leg IV: A – Tarsus; B – Tibia; C – Genu; D – Femur; E – Trochanter.

Figure 6 Occigamasus lindquistin. sp., male: A – Chelicera; B – Sternogenital shield. Leg II: C – Tibia; D – Genu and femur.

Figure 7 Occigamasusspp., female endogynia: A –Occigamasussp. 1; C – Occigamasus makarovaen. sp.; E – Occigamasussp. 2; F – Occigamasussp. 3; G – Occigamasussp. 4; I, J – Occigamasussp. 5. Subapical structure of epigynium: B –Occigamasussp. 1; D – O. makarovaen. sp.; H – Occigamasussp. 4; K – Occigamasussp. 5.

Figure 9 Occigamasus makarovaen. sp., deutonymph: Idiosoma: A – dorsal view; B – ventral view. C – Tarsus I apically, sensory field, dorsal view.