Paracoccus boumaensis, Hodgson, Chris J. & Łagowska, Bozena, 2011

Hodgson, Chris J. & Łagowska, Bozena, 2011, New scale insect (Hemiptera: Sternorrhyncha: Coccoidea) records from Fiji: three new species, records of several new invasive species and an updated checklist of Coccoidea, Zootaxa 2766, pp. 1-29 : 5-7

Paracoccus boumaensis sp. n.

( Fig. 2 )

Material studied: Holotype female: Fiji, Taveuni, Bouma Nature Reserve, on Hibiscus sp., 22.vii.2009, C.J. Hodgson ( BMNH): 1/1adf (fair).

Paratype females: data as for holotype ( BMNH): 2/5adff (fair).

Adult female

Unmounted material. Unmounted material in alcohol had a sparse, white mealy covering.

Mounted material. Body elongate oval, 1.5–2.25 mm long, 0.7–1.13 mm wide. Anal lobes lightly sclerotised, each with 2 conical setae and about 15 trilocular pores; long ventral anal lobe setae all broken but with a large sclerotised socket; anal lobe bar present, about 45 μm long. Antennae 8 segmented, 350–360 μm long. Legs well developed; coxa 125–45 μm long, with many translucent pores on dorsal surface; trochanter + femur 225–245 μm long, femur without translucent pores; tibia 185–195 μm long, tibia with a few translucent pores at distal end; tarsus about 85–95 μm long, tarsal digitules knobbed; claw about 30 μm long, claw digitules knobbed; claw without a denticle. Spiracles: anterior peritremes about 20 μm wide, posterior peritremes 27 μm wide. Clypeolabral shield about 120 μm long, labium 3 segmented, about 105–120 μm long. Circulus absent. Ostioles present but membranous, each with a few trilocular pores. Anal ring about 65 μm wide; with 6 setae, each about 50 μm long, plus pores as usual. Cerarii numbering 7 or 8 pairs, all on abdomen, none anteriorly; C11 with 1 large conical seta, C12 with 2 large setae, each about 40 μm long, C13–C17 with pairs of shorter conical setae, each 14–20 μm long, with about 5 trilocular pores; C18 similar but with about 15 trilocular pores and 2 auxilliary setae. Eyespot about 30 μm widest, without discoidal pores.

Dorsal surface with large spinose setae, largest each about 40–45 μm long, shortest about 12 μm long, each with a large sclerotised socket, largest socket about 15 μm wide; each abdominal segment with a single line of dorsal setae, of which 4 large; large setae more randomly distributed on thorax and head; flagellate setae absent. No setae with obvious concentrations of trilocular pores. Trilocular pores, each about 3 μm wide, fairly evenly distributed. Multilocular pores present on abdominal segment VII, generally 2 (range 1–3). Oral rim ducts each with a wide rim about 7 μm wide, inner duct about 8–9 μm long; with 4–8 on all abdominal segments but becoming less frequent and more randomly distributed anteriorly. Oral collar tubular ducts absent. Discoidal pores, each about 2 μm wide, sparse.

Ventral surface setae all flagellate, each 8–40 μm long, longest between antennae; spinose setae (as on dorsum) absent; cisanal setae each about 40–45 μm long. Multilocular pores each about 6–7 μm wide with 10–12 loculi, abundant across all abdominal segments as far forwards as segment IV; most dense along posterior margins but present throughout width of segments VI–VIII; also very sparse near margins on anterior abdominal segments and posterior thoracic segments, and near mouthparts. Quinquelocular pores absent. Trilocular pores as on dorsum. Discoidal pores sparse, as on dorsum. Oral rim ducts absent. Oral collar ducts of two sizes, largest about 6–7 μm long, abundant on margins of posterior abdominal segments, becoming increasing scarce anteriorly but with a small group of about 3 laterad to each procoxa; smaller oral collar ducts each about 5 μm long, rather flask-shaped, with orifice narrower than base of duct, frequent medially on posterior abdominal segments but becoming scarcer anteriorly and absent on mesothorax and anteriorly.

Comment. Paracoccus boumaensis appears to be unique in having the following combination of characters: (i) the large size of the dorsal setae; (ii) presence of multilocular disc-pores on the dorsum, and (iii) presence of obvious cerarii on the posterior 7 abdominal segments (C12– C18). This combination of characters appears to be quite different from those of known species of Paracoccus from South America (Williams & Granara de Willink, 1992), New Zealand ( Cox, 1987), Australia ( Williams, 1985) and southern Asia ( Williams, 2004).

Name derivation. The name boumaensis is composed of Bouma, the name of a nature reserve on Taveuni Island, Fiji, where this species was collected and – ensis (Latin) a suffix denoting place or locality.

P. boumaensis can be separated from the other three species of Paracoccus known from Fiji by the following key:

Key to adult female Paracoccus sp. known from Fiji (modified after Williams & Watson, 1988b).

1. Multilocular disc-pores present posteriorly on dorsum; dorsal setae mainly strongly spinose; cerarii present on 7 abdominal segments (II–VIII).................................................. P. boumaensis Hodgson & Łagowska , sp. n.

- Multilocular disc-pores absent from dorsum; dorsal setae at most weakly spinose; with either more than or less than 7 cerarii..................................................................................................... 2

2. Only one pair of cerarii present, on anal lobes.................................................. P. ilu (Williams)

- With more than 8 pairs of cerarii.......................................................................... 3

3. Oral rim ducts abundant on dorsum with 9+ in rows across each abdominal segment and also numerous near ventral margin of thorax and abdomen...................................................... P. trichospermae Williams & Watson

- Oral rim ducts few on dorsum with 8 or fewer in a single row across each abdominal segment and also few or absent from ven- tral margin of thorax and abdomen............................................ P. dendricola Williams & Watson.

Figures

FIGURE 2. Adult female Paracoccus boumaensis Hodgson & Łagowska, sp. n. Where A = dorsal trilocular pore; B = dorsal oral-rim duct; C = dorsal setae; D = dorsal discoidal pore; E = dorsal multilocular pore; F = dorsal view of anal lobe; G = ventral view of anal lobe; H = ventral multilocular pore; J = claw; K = metatibia; L = larger oral-collar duct; M = smaller oral collar duct; N = metacoxa; P = ventral discoidal pore; Q = ventral trilocular pore.