Oregmopyga Hoy, 1963

Hodgson, Chris & Miller, Dug, 2010, A Review of the Eriococcid Genera (Hemiptera: Sternorrhyncha: Coccoidea) of South America 2459, Zootaxa 2459 (1), pp. 1-101 : 66

Oregmopyga Hoy

Oregmopyga Hoy, 1963: 179 (replacement name for Onceropyga Ferris, 1955: 208 ).

Type species: Eriococcus neglectus Cockerell, 1895: 8 .

Generic diagnosis. Adult female ( Fig. 31 ). Oval, often becoming rotund when gravid. Body covered in feltlike sac. Dorsum. Setae often of 2 types: (i) spinose, short and broadly conical, with a broad basal socket, and (ii) smaller setose setae. Macrotubular ducts present or absent, when present, without a sclerotised dermal rim. Microtubular ducts present, without protruding orifice; inner ductule divided into sclerotised and unsclerotised halves. Loculate pores present, each with 5–7 loculi. Anal lobes present, unsclerotised. Margin. Undefined. Venter. Body setae slender. Macrotubular ducts present, similar to those on dorsum. Microtubular ducts present or absent. Loculate pores present. Cruciform pores present or absent. Anal ring ventral, complete, with or without pores and setae. Antennae 6 or 7 segmented. Frontal lobes present on O. neglecta but absent on O. peruviana Granara de Willink & Diaz ; antennal tubercles absent on O. neglecta but present on O. peruviana ). Labium 3 segmented; basal segment with 2 pairs of setae. Legs relatively small; hind coxae with or without translucent pores; tarsal and claw digitules with expanded, equal-sized apices; claws with small subapical denticle. Vulva present between segments VII and VIII.

On various plant families including Poaceae .

Comment. The genus Oregmopyga is mainly restricted to North America. However, a single species, O. peruviana Granara de Willink & Diaz , has been described from Peru on Vitis sp. (Vitaceae) by Granara de Willink & Diaz (2007). Their paper includes a key to the adult females of all 10 species of Oregmopyga . Oregmopyga is very similar to Ovaticoccus Kloet (diagnosed below) but differs in having anal lobes and usually having pores in the anal ring.

First-instar nymph. Generic diagnosis (based on O. peruviana Granara de Willink & Diaz ) ( Fig. 32 ).

Mounted material. Body oval. Dorsum. Enlarged setae (including marginal setae) of 1 size, arranged in 3 pairs of longitudinal lines on abdomen, and in 2 pairs on thorax and head. Macrotubular ducts absent. Microtubular ducts few, scattered. Loculate pores absent. Anal lobes small, unsclerotised. Medial plate absent. Margin. Marginal setae as described above. Anal ring without anal tube but with pores and 6 anal-ring setae. Venter. Loculate pores, each with 5 loculi, in a submarginal line on abdomen, plus single pores associated with each spiracle, near clypeolabral shield and on head. Macrotubular and microtubular ducts absent. Cruciform pores present near margin. Suranal setae hairlike. Ventral setae arranged segmentally. Antennae 6 segmented. Labium probably 3 segmented, number of setae on basal segment unknown. Legs well developed; each with tibia shorter than tarsus; tarsal and claw digitules similar and capitate; claw with denticle. (Modified after Granara de Willink & Diaz, 2007).

Comment. Of the genera known from the Neotropics for which the first-instar nymphs are known, only Exallococcus , Icelococcus and Pseudotectococcus share with Oregmopyga the presence of cruciform pores. The first-instar nymph of O. peruviana differs from all of them in having non-sclerotised anal lobes. It also differs from those of Exallococcus in having (character-states for Exallococcus in brackets): (i) only spinose setae on dorsum (hair-like setae present as well as spinose setae); (ii) no median plate (present); and (iii) ventral loculate pores present in a submarginal band on abdomen (submedially on abdomen). It differs from those of Icelococcus in having (character-states on Icelococcus in brackets): (i) short, stout dorsal spinose setae (long and narrow); (ii) only 1 type of dorsal seta (hair-like setae present in addition to spinose setae); (iii) all ventral loculate pores mainly quinquelocular (trilocular); and (iv) ventral loculate pores on abdomen submarginal (submedial). It differs from the first-instar nymphs of Pseudotectococcus in having (characterstates on Pseudotectococcus in brackets): (i) antennae 6 segmented (3 segmented); (ii) dorsal setae more abundant on abdomen than on thorax (more aboundant on thorax than on abdomen); (iii) ventral setae in three pairs of longitudinal lines on abdomen (only submarginally); and (iv) loculate pores present submarginally on abdomen (absent on abdomen).

Figures

FIGURE 31. Oregmopyga neglecta (Cockerell). Adult female, where A = dorsal seta; B = dorsal microduct, C1 & C2 = dorsal loculate pores; D = dorsal macroduct; F = anal ring; K & L = ventral loculate pores; R = ventral microduct; V = antenna; W = claw and Z = metathoracic coxa with coxal pores (modified after Miller and McKenzie, 1967).

FIGURE 32. Oregmopyga peruviana Granara de Willink & Diaz. First-instar nymph, where A = dorsal spinose seta; B = dorsal microtubular duct; C = ventral cruciform pore; L = ventral loculate pore; W = distal end of leg (modified after Granara de Willink & Diaz, 2007)