Gueriniella serratulae (Fabricius)

Unruh, Corinne M. & Gullan, Penny J., 2008, Identification guide to species in the scale insect tribe Iceryini (Coccoidea: Monophlebidae), Zootaxa 1803 (1), pp. 1-106 : 68

Gueriniella serratulae (Fabricius)

Coccus serratulae Fabricius, 1775: 744 .

Monophlebus serratulae (Fabricius) ; Cockerell (1902a: 232).

Gueriniella serratulae (Fabricius) ; Fernald (1903: 331).

Coccus picridis Boyer de Fonscolombe, 1834: 201 . Synonymy by Signoret (1876: 356).

Coccus fabae Guérin-Méneville, 1852: 334 . Synonymy by Signoret (1876: 356); unjustifiably replaced with Guerinia tinctoria by Targioni Tozzetti (1868: 724).

Unmounted material. In life, living on stems of host, protected by wax coating; producing a conspicuous mass of white cottony secretion at time of oviposition, this surrounding adult female and eggs (adapted from Morrison, 1928).

Slide-mounted material. Adult female elongate, 4.3–5.7 mm long, 2.2–3.5 mm wide. Antenna 11 segmented. Eyes, mouthparts, legs and thoracic spiracles as for tribe. Hair-like and flagellate setae distributed as for tribe, longest in marginal clusters and between antennae, clustered ventromedially on thoracic segments, forming medial to submedial transverse rows on abdomen. Simple multilocular pores, each with bilocular or trilocular centre and 6–10 outer loculi, forming dorsal transverse rows and marginal and medial clusters on each segment. Simple multilocular pores on ventral surface of two types: (i) pores with bilocular centre and 4– 8 outer loculi, scattered on medial head and thorax and forming transverse rows on medial to submedial abdomen, and (ii) pores, same structure as on dorsum, scattered amongst setae on head, thorax and marginally on all segments. Ovisac band absent. Marsupium and marsupial band absent. Vulvar opening as for tribe, surrounded by pores, each 9–10 µm in diameter, with bilocular centre and 10–12 outer loculi, and hair-like setae. Cicatrices round to oval, numbering 3–5, central cicatrix largest. Abdominal spiracles in 4 pairs on abdominal segments V–VIII. Anal tube with inner sclerotized ring of pores with 1 or 2 round central loculi and 6 or 7 round outer loculi and external opening with 2 or 3 rings of multilocular pores with trilocular centre and 5–8 outer loculi; anal opening as for tribe, except lacking specialized pores.

First-instar nymph as for tribe except for the following features: abdominal spiracles in 4 pairs, anal tube with 6 multilocular pores at external opening, each side of dorsal metathorax and each abdominal segment with 1 submarginal hair-like seta and 1 submedial multilocular pore, simple multilocular pores with trilocular (rarely bilocular) centre and 5 or 6 outer loculi, setae with slightly spatulate apices, abdominal apex with 2 pairs of hair-like setae, and each side of ventral metathorax and abdominal segment with submedial short hairlike setae and lacking marginal pore.

Type data. Coccus serratulae : ENGLAND: ex Serratula arvensis . Coccus picridis : FRANCE: Aix, ex Picris hieracioides and Serratula arvensis . Coccus fabae : FRANCE: midi de la France, ex Phaseolus fabae .

Type material. Syntypes of Coccus serratulae : ♀♀, type material lost ( Zimsen, 1964: 341). Syntypes of Coccus picridis : ♀♀, type material lost ( Ben-Dov, 2005: 182). Syntypes of Coccus fabae : ♀♀ ( MNHN) .

Taxonomic notes. Refer to the discussion of the genus Gueriniella for comparison with similar species. Refer to Unruh & Gullan (2008) for detailed information about this species.