Valid Names Results

Acanthococcus roboris (Goux, 1931) (Eriococcidae: Acanthococcus)

Nomenclatural History

Common Names

Ecological Associates

Hosts:

Families: 3 | Genera: 4

Foes:

Families: 1 | Genera: 1

Geographic Distribution

Countries: 16

Keys

  • KozarKaKo2013: pp.75-77 ( Adult (F) ) [Key to species of Acanthococcus]
  • HodgsoTr2008: pp.36-37 ( Adult (F) ) [Key for separation of adult female Eriococcida on Qurcus sp. in wstrn Palaearctic] Key as: Eriococcus roboris
  • TangHa1995: pp.450 ( Adult (F) ) [Eriococcus species] Key as: Eriococcus roboris
  • KosztaKo1988F: pp.277 ( Adult (F) ) [Acanthococcus species of central Europe] Key as: Acanthococcus roboris
  • Terezn1982: pp.35 ( Adult (F) ) [Acanthococcus species] Key as: Acanthococcus roboris
  • Danzig1971d: pp.821 ( Adult (F) ) [Key to species of family Eriococcidae] Key as: Acanthococcus roboris
  • Danzig1964: pp.632 ( Adult (F) ) [Acanthococcus species of the USSR] Key as: Acanthococcus roboris

Remarks

  • Systematics: Slide-mounted adult female with: enlarged setae cylindrical, sides straight, apices truncate, setae of 2 sizes, marginal setae larger than setae on rest of dorsum, 4-5 lateral setae on each abdominal segment (Kosztarab & Kozár, 1988). According to Hoy (1963) Lindinger (1936) erroneously considered Eriococcus roboris to be a synonym of Nidularia aceris (Signoret) and E. roboris to be a synonym of Nidularia quercus (Comstock) (Lindinger, 1957).
  • Structure: Adult female is raspberry red in color and oval in shape. Ovisac is white and felted (Goux, 1931a). Adult female: Rather large, 3.25-5 mm long; venter wider than dorsum-dorsum 1.7-3.5 mm widest, greatest total width 4.12mm. More or less oval but slightly more pointed posteriorly. Anal lobes sclerotised, comparatively small, median plate triangular. Dorsum covered in truncate spinose setae; those along margin slightly larger. Dorsum also with numberous macrotubular ducts (of one size) and microtubular ducts (each with a divided dermal oriface); venter with macro- and microtubular ducts similar to those on dorsum, restricted to near margin; also with smaller macrotubular ducts present posteriorly on venter of abdomen and metathorax; quinquelocular pores abundant on abdomen, less frequent more anteriorly; cruciform pores present submarginally; mainly in groups on anterior abdominal segments and thorax. Legs relatively small but normally developed; metacoxae without pores but with spicules; claws with a strong denticle. antennae 7 or 8 segmented, with setae on all segments; frontal lobes present. (C. Hodgson & K. Trencheva, 2008) Second-instar female: Small; oval but more pointed posteriorly; about 1.2-1.45 mm long; venter clearly wider than dorsum; dorsum 457-730 µm wide; total width of mounted specimens about 620-860 µm. Anal lobes sclerotised, comparatively large; median plate present. Dorsum with truncate spinose setae; those along margin slightly larger, those forming longitudinal rows submedially and medially on abdomenal segments II-VII tending to be smaller. Dorsum also with numerous microtubular ducts(each dermal orifice with two large wing-like extensions); macrotubular ducts absent from both surfaces; quinquelocular pores absent from dorsum but frequent on venter. Cruciform pores present submarginally, in groups on anterior abdominal segments and meso- and metathorax. Legs comparatively well developed; claws with a strong denticle. Antennae 6 or 7 segmented, with well-developed frontal lobes. (C. Hodgson & K. Trencheva, 2008) First-instar nymph: Oval in outline, rather more pointed posteriorly, 750-850 µm long, dorsum 350-375 µm wide (verter wider); anal lobs short but with 3 pairs of quit sharply-pointd spinose setae dorsally in addition to long flagellate spical seta; median plate indicate by a small membranous outgrowth with perhaps 1 or 2 protuberances. Antennae 6 segmented; frontal lobes absent; dorsal microtubular ducts present; each outed orifice with two large wing-like extensions; quinquelocular pores present ventrally on head, thorax and abdomen; cruciform pores present submarginally on venter of thorax; marginal and dorsal setae all spinose and sharply pointed, each with a slightly swollen base; dorsal spinose setae in 4 longitudinal lines + marginal setae; claw with a well-developed denticle.
  • Biology: This species lays red eggs in June which hatch in the end of July in Hungary (Kosztarab & Kozár, 1988). Lives in bark crevices of trunk and branches, on the stem and base of young twigs, or at base of buds or twig forkings, sometimes under the litter on the roots. Female appears with egg sacs in May. (Kozár, et al., 2013)
  • General Remarks: Detailed description and illustration by Kosztarab & Kozár (1988). Detailed description and illustrations in Hodgson & Trencheva (2007). Description and illustration of first instar nymph in Kozár, et al., 2013.

Illustrations

Citations