Sangicoccus truncatispinus (Reyne)

Kozár, Ferenc, Williams, Douglas J. & Benedicty, Zsuzsanna Konczné, 2009, A new genus and four new species of the scale insect family Eriococcidae (Hemiptera: Coccoidea) from the Austro-Oriental Region., Zootaxa 1979, pp. 1-15 : 12

Sangicoccus truncatispinus (Reyne) ( Fig. 5 )

Haematococcus truncatispinus Reyne, 1961: 138 .

Sangicoccus truncatispinus ( Reyne) , Reyne, 1965: 180.

Material examined. Papua New Guinea, locality unknown, 1937, J.L. Froggatt, 1 female. Papua New Guinea, Sepik Dist. Cocos nucifera, Szent-Ivany , 3.iii.60, 3614, C.I.E. 5476–17110, B.M. 1963.3, one female, det. D.J. Williams ( BMNH).

Adult female. Body of slide-mounted specimens, broadly oval, about 1.47–1.76 mm long, 1.22–1.50 mm wide. Antennae 3 segmented, segment lengths (µm) I 15– 24, II 9–9, III 50 –54, all segments with a few short setae; segment II with sensory pore; apical segment with several apical setae, each 18–20 µm long, plus 4 falcate sensory setae. each 18–20 µm long. Frontal lobes present, large. Eyes present near ventral margin.

Venter. Labium 55–58 µm long, unsegmented, with minute setae present on tip. Legs short and not well developed, lengths in (µm), forecoxae 26–26, trochanter fused with femur 55–60, tibia 23–28, tarsus 30–32, claw 16–17. Midcoxae 30–32, trochanter + femur 58–65, tibia 30–39, tarsus 28–32, claw 16–18. Hindcoxa 38–42, trochanter + femur 77–80, tibia 34–40, tarsus 34–40; tarsal digitules knobbed, each 28–34, claw 16–17, claw digitules 22–31 µm long, slightly knobbed. All coxae with spinulae; hindcoxae and femora each with several large, irregularly-shaped translucent pores on both surfaces; each trochanter with 2 pores on each side; claws each curved, with stout basal half, each with denticle. All legs with a few hair-like setae and with 1 sensory pore proximally on each tarsus. Spiracles each about 26–29 µm in diameter, with a few associated disc pores. Locular disc pores, each 5–6 µm in diameter, with 5–7 loculi in segmental bands medially across abdominal segments VI–VIII, and scattered along entire submargin. Setae few, short, hair-like, each about 8 µm long. Instead of cruciform pores, modified microtubular ducts present, fairly abundant. Macrotubular ducts, each about 18 µm long and 3 µm wide, present submarginally on some abdominal segments; each with a wide sclerotized rim surrounding orifice and with inner ductule shorter than outer ductule, ending with a circular gland. Oviduct or internal genital opening not clearly discernible. Anal lobes each apparently without subapical seta, short suranal seta present. Dorsum. Marginal setae truncate-conical, 11–21 µm wide and 20–34 µm long, present in 11 compact groups, more or less equispaced, each on a sclerotised area of derm. Dorsal setae of two main sizes: larger spine-like setae robust, each bluntly pointed, 50–53 µm long with a striated surface, present in 2 longitudinal rows of about 11–12 spines on midline, and also sparsely in a narrow band of about 16 spines just mesad to marginal groups of truncate setae; smaller setae, each robust but more slender, each 28–46 µm long, evenly distributed throughout and fairly numerous. Macrotubular ducts absent. Microtubular ducts, each 5 µm long, 1 µm wide, present among dorsal setae and with several near bases of some truncate-conical seta although not so closely associated as in S. morrisoni or S. reynei . Locular disc pores with 5–7 loculi present on almost all segments of abdomen. Anal ring, 81–91 µm long, 66–74 µm wide, with a sparse row of pores plus 6 flagellate anal ring setae, each about 96–100 µm long. Anal lobes forming a narrow band, almost encircling anal ring, each with 2 truncate spine-like setae on inner margin, and 2 apical setae (broken). Cauda present but not distinct.

Comments. This description and illustration are based on two different specimens to that discussed by Williams & Watson (1990) and shows some differences. The size of the three anterior-most groups of truncate-conical setae are much larger than the others around the margin, giving the impression that each is composed of two groups that are merged. The total number of marginal groups is also 11 and not 13. Another difference is in the distribution of the translucent pores on the hind legs, which on the specimens studied here are on the coxa and femur whereas on the specimens studied by Williams & Watson (1990) they are shown on the coxa and tibia. Furthermore, the holotype, as described by Reyne (1961), possesses 12 truncate-conical setae on each posteriormost group whereas in the specimen discussed here and those seen by Williams & Watson (1990) have only six or seven. There is probably much variation in some characters in this species (for clarification of these details, it will be necessary to collect and study new material), but S. truncatispinus differs in several characters from others in the genus, as shown in the following key.

Figures

FIGURE 5. Sangicoccus truncatispinus (Reyne). Adult female.