Rhizoecus

Kaydan, Mehmet Bora, Konczné Benedicty, Zsuzsanna, Williams, Douglas J. & Szita, Éva, 2017, Scale Insect (Hemiptera, Coccomorpha) Survey Of Soil Samples From Southern Asia With Description Of Two New Species Of Rhizoecidae, Acta Zoologica Academiae Scientiarum Hungaricae 63 (3), pp. 309-325 : 313-314

Rhizoecus Künckeld’ Herculais, 1878

Rhizoecus Künckeld’ Herculais, 1878: 163. Typespecies: Rhizoecusfalcifer Künckeld’ Her- culais, bymonotypy.

Neorhizoecus Hambleton, 1946: 40 . Typespecies: Rhizoecuscoffeae Laing, byoriginaldesig- nation.

Radicoccus Hambleton, 1946: 47 . Type species: Rhizoecus globosus James , by original desig- nation.

Description (modified from KOZÁR & KONCZNé BENEDICTY, (2007) – Body of adult female small, elongate to round, membranous. Anal lobe poorly or moderately developed, often bearing 3 long apical setae (1 ventral and 2 dorsal) or with numerous short setae. Antennae short, strongly geniculate, placed close together, each five or six segmented, seg- ments 2–5 often wider than long, last segment usually longer than wide, in 6 segmented antennae 1 falcate sensory setae on the antennal segment V, 1 falcate sensory seta on an- tennal segment V. In 5 segmented antennae there are 5 falcate sensory setae on terminal segment, 1 near base of segment which shows that in this group of species fifth and sixth segments fused. Labium longer than wide. Legs well developed, tarsus usually shorter than tibia, often with spine- like setae on inner margins, tarsus tapering. Claw slender and elongate, with short setose digitules or with knobbed digitules about as long as claw. Eyes present or absent. Circuli if present, numbering 1–6, circulus truncate conical, elongate cy- lindrical or bulbous with distal end sometimes flat, reticulated or with minute papilla like projections. Anterior and posterior ostioles normally present.

Frons often with a ventral sclerotized cephalic plate, sometimes with a few setae on margin. Body setae usually short and hair- like (flagellate), often extensively covering surface. Trilocular pores and oral collar tubular ducts present. Multilocular disc pores each with 7–12 loculi, present or absent. Discoidal pores sometimes present. Tritubular pores present in adult female, normally on both surfaces. Anal ring well developed bearing 6 hair- like setae and with large elongate to triangular pores. Anal ring pores often with different sizes of spiculae.

Internal genital organ showing great variability in structure, shape and size. Length of vulva+common oviduct sometimes only as long as half width of segment, in other cases it could be as long as width of three segments. Distance of vulval accessory glands from vulvar opening also very different.

Host plant. Host plants of many species are unknown. Several species are known

from Cactaceae , Coffea spp. , Fragaria spp. , Medicago spp. , Thea spp. , palms and Poaceae . Biology. Several species are important pest of different crops and ornamentals.

KEY TO ADULT FEMALES OF RHIZOECUS FROM SOUTHERN ASIA (modified from WILLIAMS 2004 and KOZÁR & KONCZNé BENEDICTY 2007)