Peliococcus phyllobius (Goux)

Kaydan, Mehmet Bora, 2015, A systematic study of Peliococcus Borchsenius (Hemiptera: Coccoidea: Pseudococcidae), with descriptions of a new Palaearctic genus and four new species from Turkey, Zootaxa 3920 (2), pp. 201-248 : 222-224

Peliococcus phyllobius (Goux)

( Fig. 8 )

Phenacoccus phyllobius Goux, 1938: 451 .

Peliococcus phyllobius (Goux) : Kozár & Walter, 1985: 70 (change of combination); Danzig & Gavrilov-Zimin, 2014: 435.

Material studied. Paratypes: 1 adult female, France, Marseille, Mazargues, on Koeleria villosa (Poaceae) , 05.vi.1932, coll: L. Goux ( MNHN: 14760-2); and 1 adult female: Var La Seyne-sur-Mers, on Bromus sp. ( Poaceae ), 15.v.1937, coll: L. Goux ( MNHN: 14759-2).

Description. Adult female. Body elongate oval, 2.74–3.72 mm long, 1.54–1.94 mm wide. Eye marginal, 60–80 µm wide. Antenna 9 segmented, 490–530 µm long; apical segment 60–65 µm long, 40 µm wide; apical setae ca 40 µm long, plus 3 fleshy setae, each 27–40 µm long. Tentorium 175–185 µm long, 140–150 µm wide. Labium 130–140 µm long, 82–120 µm wide. Anterior spiracles 67–70 µm long, 27–38 µm wide across atrium; posterior spiracles 75–85 µm long, 45–50 µm wide across atrium. Legs well developed; posterior legs: coxa 200–220 µm long; trochanter + femur 290–320 µm long; tibia + tarsus 360–410 µm long, hind legs without translucent pores, claw 27.5–33.0 µm long. Ratio of lengths of tibia + tarsus to trochanter + femur 1.24–1.28:1; ratio of lengths of tibia to tarsus 2.55–2.72:1; ratio of length of trochanter + femur to greatest width of femur 3.55–3.74: 1. Tarsal digitules hair-like, each 25–30 µm long. Claw digitules knobbed, each 27.5–35.0 µm long. Circulus oval, 65–75 µm wide. Anterior ostioles with a total for both lips of 9–22 trilocular pores and 4 or 5 setae; posterior ostioles with a total for both lips of 32–37 trilocular pores and 4–7 setae. Anal ring 85 µm wide, with 6 setae, each seta 145–155 µm long. Cerarii slightly sclerotized, numbering 15 marginal pairs; C3 with 3 enlarged setae, each 12–15 µm long, plus 6 or 7 trilocular pores; anal lobe cerarii each with 2 enlarged setae, 20–28 µm long, plus 20–25 trilocular pores and 2 or 3 spine-like auxiliary setae; other marginal cerarii each with 2 enlarged setae and 1 or 2 trilocular pores; dorsal cerarii present on abdominal segment VII and on thorax only, each with 2 spine-like setae plus 3–5 trilocular pores.

Dorsum. Setae spine-like (but not similar to cerarian setae), each 7.5–17.5 µm long, each generally with one, but occasionally more, trilocular pores near basal socket. Clusters each with 1–3 multilocular disc pores, each 9–10 µm in diameter, and a single tubular duct 13–15 µm long, 5–6 µm wide in centre; with a total of 3–6 clusters present on head and thorax; also on abdominal segments as follows: I 2, II 2 or 3, III 9–11, IV 6–8, V 8–10, VI 4–6, VII 5–7, VIII + IX 0. Trilocular pores, each 4–5 µm in diameter, scattered throughout. Minute discoidal pores, each 2.5 µm in diameter, few, scattered throughout.

Venter. Setae of 2 types: (i) slender hair-like setae, each 15–120 µm long, longest setae medially on head; and (ii) spine-like setae, each 10–15 µm long, in submarginal rows. Apical seta on each anal lobe 215 µm long. Multilocular disc pores present in clusters, each with 1–4 multilocular disc pores and a single small tubular duct in centre, present medially on abdominal segments III and IV, totalling (for both segment) 8–10 clusters similar clusters also present in a submarginal row of head, thorax and abdominal segments; multilocular disc pores, each pore 7.5–9.0 µm, also present on posterior abdominal segments as follows: V 4, VI 15–31, VII 48 –65, VIII+ IX 42 –47. Quinquelocular pores, each 6–7 µm in diameter, scattered in middle areas of head, thorax and abdominal segment II. Trilocular pores, each 3–4 µm in diameter, scattered throughout. Minute discoidal pores, each 2 µm in diameter, very few, scattered throughout. Oral collar tubular ducts of 3 of sizes: small ducts, each 12.5 µm long, 2.0–2.5 µm wide, restricted to middle of each cluster on abdominal segments III and IV; rather similar ducts but slightly longer, each 12–13 µm long, 2.5–3.0 µm wide, concentrated along body margin and in single rows on all other abdominal segments as follows: V 50 –60, VI 48 – 61, VII 26, VIII + IX 26–32; and largest ducts, each 13–15 µm long, 5–6 µm wide, present in the centre of submarginal clusters.

Comments. Peliococcus phyllobius can be distinguished from other species in the genus in having the following combination of characters: (i) 15 pairs of marginal cerarii; (ii) only 1 size of oral collar tubular duct in each cluster, and (iii) each dorsal cluster with only 1–3 multilocular disc pores. P. phyllobius is most similar to P. agriensis but it differs in having only 15 pairs of marginal cerarii ( P. agriensis has 17 pairs).

Danzig & Gavrilov-Zimin (2014) used Fig. 8 as their figure 2.1.3-19.

Host plants. On Bromus sp., Koeleria villosa (Poaceae) .

Distribution. France (Toulon).

Figures

FIGURE 8. Peliococcus phyllobius (Goux), paratype. Note: 15 pairs of marginal cerarii; only 1 size of oral collar tubular duct in each cluster; each dorsal cluster with only 1 – 3 multilocular disc pores, and absence of multilocular pores and oral collar tubular duct on dorsum of VIII + IX.