Icelococcus Miller & González, 1976

Hodgson, Chris & Miller, Dug, 2010, A Review of the Eriococcid Genera (Hemiptera: Sternorrhyncha: Coccoidea) of South America 2459, Zootaxa 2459 (1), pp. 1-101 : 51-54

Icelococcus Miller & González

Icelococcus Miller & González 1975: 152 .

Type species: Icelococcus charlini Miller & González, 1975: 152–154 .

Generic diagnosis. Adult female ( Fig. 24 ). According to Miller and González (1975), I. nothofagi adult females occur in the twig axils of Nothofagus . The adult females are dark grey and do not form an ovisac. Dorsum. Dorsal setae of 2 sizes: (i) larger spinose setae along margin and medially; and (ii) smaller setae elsewhere. Macrotubular ducts absent. Microtubular ducts with a long ductule and unsclerotised orifice. Loculate pores absent. Anal lobes heavily sclerotised and rugose, with many medial teeth and 3 dorsal enlarged spinose setae. Median plate present. Anal ring apical, not invaginated, with 4 pairs of anal ring setae and numerous pores. Margin. Demarcated by a line of enlarged spinose setae. Venter. Ventral setae of 2 sizes: (i) spinose setae, similar to those on dorsum, present marginally and medially on head; and (ii) setose setae, sparce elsewhere. Macrotubular ducts present in a mediolateral band on I. charlini , absent on other two species. Microtubular ducts restricted to anterior portion of head. Loculate pores frequent throughout. Cruciform pores sparse submarginally, most frequent on abdomen. Labium 3 segmented; with 2 pairs of setae on basal segment. Antennae 6 segmented. Frontal lobes and antennal tubercles absent. Legs relatively small; metacoxae and metafemur each with a few irregularly-shaped translucent pores; tarsal digitules similar; claw digitules similar; claw with a small denticle. Vulva present between segments VI and VII.

Known only from Anacardiaceae and Nothofagaceae .

Comment. Icelococcus contains 3 species, the type species ( I. charlini ), I. lithreae Hodgson & Miller and I. nothofagi Miller and González and is known only from Chile.

Adult female Icelococcus are characterised by: (i) anal lobes with teeth on inner margin; (ii) few or no macrotubular ducts; (iii) labium distinctly 3 segmented; (iv) cruciform pores present on venter; and (v) median plate present. For further details see Miller & González (1975).

First-instar nymph (of I. lithrae Hodgson & Miller , sex not determined) ( Fig. 25 )

Diagnosis. Mounted material. Body oval, more pointed at posterior end. Dorsum. Dorsal setae of 1 type but rather variable in size, more or less in 2 submedial lines, 2 mediolateral lines and around margin. Macrotubular ducts absent. Microtubular ducts small, with a bifurcate dermal orifice, scattered. Anal lobes sclerotised, each with a rather serrate inner margin. Median plate present. Margin. Delineated by band of spinose dorsal setae. Venter. Setae of 2 types: those near margin slightly spinose, those more medially hairlike. Macrotubular ducts absent. Microtubular ducts absent. Loculate pores, each with 3 loculi, present in a very sparse longitudinal line mediolaterally. Cruciform pores few, submarginal on thorax. Antennae 6 segmented. Labium clearly 3 segmented, basal segment with 2 pairs of setae. Legs without pores; tarsus much longer than tibia; tarsal digitules capitate; claw with a denticle; claw digitules similar both with small capitate apices.

Comment. The only other South American first-instar nymphs with sclerotised anal lobes and 6 segmented antennae are Chilechiton and Exallococcus . These latter 2 genera also share with Icelococcus the mediolateral line of loculate pores on the venter but are otherwise rather different, both of the latter having much more strongly spinose dorsal setae and only a 2-segmented labium. For other differences, see key.

Figures

FIGURE 24. Icelococcus nothofagi Miller & González. Adult female, where A = dorsal spinose seta; B = dorsal microtubular duct; J = ventral seta; J1 = ventral submarginal spinose setae; K = ventral microtubular duct; L = ventral loculate pore; P = anterior spiracle; R = marginal spinose seta; U = cruciform pore; W = claw of prothoracic leg; X = suranal seta, and Z = coxa and femur of metathoracic leg (modified after Miller & González, 1975).

FIGURE 25. Icelococcus lithreae Miller and González. First-instar nymph, where A = dorsal seta; B = dorsal microtubular duct; J = spinose submarginal seta; L = ventral trilocular pores; R = marginal setae; T = antennal tubercle; U = cruciform pore; W = distal end of metathoracic leg, and Z = left side of anal ring.