Eriococcus dombeyae González, 2008

González, Patricia, 2008, Two new species of Eriococcus (Hemiptera: Coccoidea: Eriococcidae), from the Andino Patagonica region of Argentina, with a key to the Eriococcus species of that region, Zootaxa 1899, pp. 50-56 : 51-53

Eriococcus dombeyae González sp. nov.

( Fig. 1 )

Type material. Holotype adult female. Argentina, Río Negro, Ventisquero Negro, Cerro Tronador, on Nothofagus dombeyi , 1/i/1999, Willink col. ( IMLA) 1(1) adult female.

Paratypes: data as for holotype, 2(5) adult females.

Non-type material: Argentina, Chubut, Parque Nacional Los Alerces, 8/i/1999, Willink col. ( IMLA) 1(3). Neuquén, Villa Traful, -/ ii/2003, Willink col. ( IMLA) 2(4). R. 67, Camino a Traful, 22/i/1999, González col. ( IMLA) 1(2). Río Negro, Bariloche, Lago Gutierrez, 5/i/ 1999, Willink col. ( IMLA) 1(2). All adult females and all on Nothofagus dombeyi (Fagaceae) .

Species diagnosis. Adult female. Dorsum with mainly large, blunt, spinose setae but very small dorsal setae also present on posterior abdominal segments. Microtubular ducts of type B1 scarse on both dorsum and venter; macrotubular ducts rather variable in shape and size; cruciform pores absent; loculate pores restricted to medial area on abdomen and near each spiracle. Anal lobes sclerotised and distinct, each with one spinose ventral seta. Suranal setae spinose. Hind coxae, femora and tibia with translucent pores; claw without denticle; claw digitules dissimilar.

Description. Body oval in outline; 1.47 (1.0–1.40) mm long, 1.25 (0.9–1.0) mm wide. Anal lobes sclerotised, each 49 µm long, 39 µm wide, with three dorsal spinose setae: external marginal and posterior inner marginal setae each 34 (34–39) µm long, anterior inner margin seta 24 (23–25) µm long; ventral surface with a single spinose seta, 23 (19–21) µm long. Apical setae 85 (64–78) µm long.

Dorsal surface: setae all spinose, straight or curved, blunt or with a rounded apex, of variable size, each 23–35 µm long, equal to or smaller than marginal setae; without evident arrangement on thorax and cephalic region but in segmental bands on abdomen; a medial pair of small setae, 10 µm long, present on each of abdominal segments V–VII; larger spinose setae also present medially on segment VI and medially and submedially on segment V, absent on segment VII, with a total of 6 setae on segment V, 4 setae on segment VI, and 2 setae on segment VII. Macrotubular ducts numerous throughout, symmetrical ( Fig. 1 s) and asymmetrical ( Fig. 1 a) both with a thick internal ductule with a terminal gland, a long and narrow outer ductule of variable length, each 17–22 µm long, 2.45 µm wide (longest on body margin); and a sclerotised dermal orifice (appearing similar to cruciform pores). Microtubular ducts of type B1 infrequent but evenly distributed. Anal ring with six setae, 82 (70–74) µm long, and two rows of pores. Medial plate absent.

Margin: spinose setae present along body margin, with two large and one smaller setae on lateral margin on each of segments V–VII, larger setae each 34 (34–35) µm and smaller seta 24 (19–24) µm long; other abdominal segments each with two setae.

Ventral surface: flagellate setae present medially on thorax and abdomen and with 5 pairs anterior to mouthparts, of variable length, each 14–36 µm. Spinose curved setae, similar to dorsal setae, present along submargin, with one seta on each thoracic and abdominal segment, but more numerous in cephalic region. Straight, finely spinose setae also present submarginally, except on abdominal segments VI–VII. Suranal spinose setae each 47 (43–45) µm long. Quinquelocular pores sparse medially on abdominal segments and near each spiracle. Cruciform pores absent. Macrotubular ducts rather variable in size and shape, larger 17–22 µm long, 2.45 µm wide, sparse throughout on the surface, but more numerous on body margin; shortest 12 µm long, 2.45 µm wide, scarce on abdomen, a few present on submargins of last abdominal segments submargin. Microtubular ducts type B1 infrequent marginally. Hind coxae each about 97.5 (96–101) µm long, with microspines on ventral surface plus about 20 small dorsal rounded translucent pores; hind trochanter + femur each 144 (142–156) µm long; femur with about 20 small pores throughout posterior surface plus 5 setae; tibia each 66 (65–78) µm long, with about 6 small pores (occasionally absent) plus 4 setae; tarsi each 82 (82–85) µm long; tarsal digitules both narrow, with equal-sized, slightly expanded apices; one of claw digitules broader than other, with unequal-sized apices; claw each without a denticle. Prothoracic tibia each with four setae. Antennae 6 (occasionally 7) segmented, each 152 (150–160) µm long. Frontal lobes absent. Labium 3- segmented, basal segment lightly sclerotised with one pair of setae. Anal tube unsclerotised.

Distribution: Argentina; Patagonia.

Biological data: females are present on the leaves of the host.

Notes: Adult females of Eriococcus dombeyae sp. nov. are similar to those of E. chilensis Miller & González , E. navarinoensis Hoy and E. rhadinothrix Miller & González. However , E. dombeyae differs from E. chilensis in having (character-states on E. chilensis in brackets): (i) numerous dorsal setae (few), (ii) each of abdominal segments V–VII with three marginal setae (two); (iii) dorsal posterior segments of abdomen with pairs of minute setae (absent); and (iv) small pores present on tibia (absent). E. dombeyae differs from E. navarinoensis in having (character-states on E. navarinoensis in brackets): (i) dorsal setae on thorax and cephalic regions similar to those on abdominal margin (more slender than those on abdominal margin) and (ii) quinquelocular pores restricted to medially on abdomen and near each spiracle (also frequent in a ventral mediolateral band). E. dombeyae differs from E. rhadinothrix in having (character-states on E. rhadinothrix in brackets): (i) quinquelocular pores more or less restricted to medial area on abdomen and near each spiracle (throughout venter); (ii) posterior three abdominal segments with three marginal setae (with two setae) and (iii) small pores present on each hind tibia (absent).

Etymology: the name dombeyae is derived from the specific name of the host plant, Nothofagus dombeyi .

Figures

FIGURE 1. Eriococcus dombeyae González sp. nov. Adult female. Where a = asymmetrical macrotubular duct; s = symmetrical macrotubular duct, and b 1 = microtubular duct.