Phenacoccus poae, Moghaddam, 2019

Moghaddam, Masumeh, 2019, Two new scale insect species (Hemiptera: Coccomorpha: Acanthococcidae and Pseudococcidae) and a new country record from protected areas in Iran, Zootaxa 4706 (3), pp. 451-460 : 452-454

Phenacoccus poae sp. n.

( Fig. 1 )

Material examined. Holotype, adult female: IRAN, left label: 2970 / Markazi province, Arak / Haftad-Gholleh Protected Area / Sibak / 10.vi.2018 / Alt. 1892 m / N34˚05′40.4″ / E50˚14′34.6″; right label: Holotype / Phenacoccus poae sp. n. / on Poaceae / coll. M. Moghaddam ( HMIM) . Paratypes: IRAN, 6 adult females mounted singly on slides, each left label with same data as holotype slide; right label: Paratype / Phenacoccus poae sp. n. ’, (5 slides HMIM, 1 slide NHGR).

Live adult female. Body oval, covered with thick white wax. Living on upper surface of leaves.

Slide-mounted adult female ( Fig. 1 ), based on 5 specimens. Body oval to broadly oval, 3.55 (2.88–3.74) mm long and 1.92 (1.40–1.92) mm wide. Eye situated on margin, 40 (38–50) μm in diameter. Antennae each 9 segmented, 400 (384–432) μm long, with apical segment 56 (52–64) μm long, 20 (20–24) μm wide. Circulus ab- sent. Legs well developed; measurements for posterior legs: trochanter + femur 248 (232–272) μm long, tibia + tarsus 312 (304–336) μm long, claw about 32 μm long. Ratio of lengths of tibia + tarsus to trochanter + femur 1.25 (1.23–1.31:1); ratio of lengths of tibia to tarsus 2.45 (2.21–2.45:1); ratio of length of hind trochanter + femur to greatest width of femur 4.70 (3.77–4.80:1). Tarsal and claw digitules both knobbed; claw digitules longer than claw; claw with denticle. Hind coxa, femur and tibia all with translucent pores. Anterior and posterior ostioles each with a total for both lips of 16 (16–21) trilocular pores, and posterior lip of each anterior spiracle with 2 (1 or 2) setae. Anal ring 72 (66–90) μm wide, with 3 rows of pores and 6 setae, each seta 112 (90–112) μm long. Cerarii numbering 3 (3 or 4) pairs; anal lobe cerarii (C 18) each containing 2 lanceolate setae, each 18 (18–20) μm long, 6 (6–9) trilocular pores, all situated on a sclerotized area; penultimate cerarii (C 17) with 2 lanceolate setae and 3 or 4 trilocular pores; C 16 with 2 setae and 2 or 3 trilocular pores; frontal cerarii (C 1) present in about 50% of specimens, if present each cerarius with 2 lanceolate setae and 2 trilocular pores.

Dorsum with lanceolate setae, mostly each 16–28 (12–28) μm long; some minute setae present, each about 4 μm long; setae mainly distributed across all segments. Oral collar tubular ducts all same size, each with inner ductule and flower-like sclerotized terminal structure, numerous, present on all segments in more or less 2 or 3 rows per segment. Trilocular pores, each about 4 μm in diameter, scattered over entire body. Minute discoidal pores scattered throughout. Multilocular disc pores absent from dorsum.

Venter with setae normal and flagellate, each 18–106 μm long. Apical seta on each anal lobe 208 (150–208) μm long. Multilocular disc pores present, each about 7 μm in diameter, with 1 or 2 at posterior edge of abdominal segment IV, more numerous at posterior edges of segments V–VII, also present at anterior edges of segments VII, VIII +IX, and sometimes 1 submedially on segment IV. Quinquelocular pores, each about 4 μm, numerous across venter of head, thorax and abdominal segments I–VIII+IX. In medial zone, trilocular pores replaced by quinquelocular pores, and a few quinquelocular pores present submarginally. Minute discoidal pores scattered throughout. Oral collar tubular ducts same as those on dorsum, numerous across head, thorax and abdominal segments.

Comments. Phenacoccus poae sp. n. comes close to P. arthrophyti Archangelskaya, 1930 in having: (i) antenna 9 segmented, (ii) circulus absent, (iii) trilocular pores are replaced by quinquelocular pores in medial zone of ventral surface, (iv) cerarii numbering 3 or 4 pairs. It differs as follows (character states of P. arthrophyti in brackets): (i) dorsal multilocular pores absent (present), (ii) tubular ducts numerous on dorsum, forming 2 or 3 transverse rows on all segments (each segment with 1 transverse row and scattered sparsely on head) (iii) tubular ducts numerous on venter, forming 2 or 3 transverse rows on all segments (forming 1 transverse row on ventral abdominal segments III–VII, and sparsely mainly along anterior abdominal segments and thorax) (iv) hind coxa, femur and tibia with translucent pores (translucent pores absent).

Etymology. The species epithet is based on the host-plant family name, Poaceae .

Figures

FIGURE 1. Adult female of Phenacoccus poae sp. n.