Coccus malloti (Takahashi, 1956)

Choi, Jinyeong & Lee, Seunghwan, 2018, Review of the genus Coccus Linnaeus from Korea, with description of a new species (Hemiptera, Coccomorpha, Coccidae), ZooKeys 734, pp. 121-135 : 126-128

Coccus malloti (Takahashi, 1956) Figs 4 A–B, 5 A–Q

Pulvinaria malloti Takahashi, 1956: 25.

Material examined.

Adult female: Jeollanam-do, Gwangyang-si, Ongnyong-myeon, Chusan-ri, 28.v.2015, coll. J.Y. Choi, on Ilex cornuta Lindl. ( Aquifoliaceae ), 9♀♀; Jeju-do, Seogwipo-si, Andeok-myeon, Gamsan-ri, 27.iv.2016, coll. J.Y. Choi, on Aphananthe aspera (Thunb.) ( Cannabaceae ), 1♀.

Diagnosis.

Adult females in life (Fig. 4 A–B) with a reticulated pattern of black stripes and a longitudinal band medially on dorsum; dermal areolations present but small; dorsal tubercles present; dorsal tubular ducts absent; dorsal setae sharply spinose; marginal setae mostly with simple pointed apices; multilocular disc-pores usually with ten loculi; ventral tubular ducts of three types: Type I with a broad inner ductule, densely present on posterior medial area of head; frequent on anterior medial area of prothorax, extending to inner submarginal area of thorax; and also sparsely scattered on inner submarginal area of abdomen; Type II with a narrow inner ductule and a large flower-shaped terminal gland, rarely present on inner submarginal area and posterior medial area of abdomen; Type III with a long filamentous inner ductule and a quite small terminal gland, moderately present on submarginal area between anal clefts and each posterior spiracular furrow; all types of ventral tubular ducts absent on medial area of meso-, metathorax and anterior abdomen, and submarginal area of head; antennae each eight segments; legs each with a tibio-tarsal sclerosis on the articulation.

Redescription.

Adult female. Living appearance (Figs 4 A–B). Body elongate oval, flattened, or slightly convex. Young adult females yellowish to dark brownish, with a reticulated pattern of brown or black stripes, getting darker at maturity. Eggs reddish in color, stored beneath venter.

Slide-mounted material (Fig. 5 A–Q). Body elongate oval, 3.6-4.8 mm long, 2.2-3.3 mm wide, with shallow to deep stigmatic cleft; anal clefts approximately 1/6 of body length.

Dorsum. Derm membranous. Dermal areolations oval and small, each with a microduct. Dorsal tubercles normally convex, present on submarginal area, 1-5 in total on each side: one or two between apex of head and anterior stigmatic cleft, zero to two between anterior and posterior stigmatic clefts, and zero or one between posterior stigmatic cleft and anal cleft. Dorsal setae sharply spinose, short, stout, each 6-9 μm long, moderately distributed on dorsum. Dorsal tubular ducts absent. Dorsal microducts evenly scattered over entire dorsum. Preopercular pores round and small, 3-5 μm wide, set in a small group of approximately 8 in front of anal plates. Anal plates quadrate, 217-249 μm long, 169-198 μm wide, each with slightly concaved posterolateral margin, usually posterolateral margin quite longer than anterolateral margin; anterolateral margin 123-143 μm long, posterolateral margin 150-169 μm long; each plate with four apical setae. Ano-genital fold with two pairs of anterior and three pairs of lateral margin setae. Anal ring with six long setae.

Margin. Marginal setae spinose, straight or slightly bent, each 14-22 μm long, mostly with simple pointed apices; with 30-43 present between anterior stigmatic clefts; 13-17 laterally present between anterior and posterior stigmatic clefts, 22-38 present between posterior stigmatic cleft and anal clefts. Stigmatic clefts shallow to deep, each with three stigmatic spines, median spine nearly twice as long as lateral spine: medians 60-75μm long, laterals 24-38 μm long. Eyespots located near margin.

Venter. Derm membranous. Multilocular disc-pores 6-7 μm wide, each with 8-10 loculi, mostly with ten loculi, abundant around vulvar area; one or two transverse rows on each abdominal segments; and also small groups present laterad of each metacoxa and mesocoxa, but not observed around procoxa. Spiracular pores 4-5 μm wide, each with five loculi, in a narrow band 2-4 pores wide between each spiracle and stigmatic cleft. Ventral tubular ducts of three types: Type I each with 33-39 μm long, with a developed outer ductule and a moderately broad inner ductule, straight or slightly curved, with a flower-shaped terminal gland, densely present on posterior medial area of head; frequent on anterior medial area of prothorax, extending to inner submarginal area of thorax; and also sparsely scattered on inner submarginal area of abdomen; Type II each with 16-24 μm long, with a narrow inner ductule and a large flower-shaped terminal gland, rarely present on inner submarginal area and posterior medial area of abdomen; Type III each with 15-24 μm long, with a long filamentous inner ductule and a quite small terminal gland, moderately present on submarginal area between anal clefts and each posterior spiracular furrow; all types of ventral tubular ducts absent on medial area of meso- and metathorax and anterior abdomen, and submarginal area of head. Ventral microducts present on entire venter, especially frequent on sub margin. Ventral setae with three pairs of long pregenital setae; approximately three or four pairs of long and short setae between antennae; other setae sharply spinose, each 5-10 μm long, sparsely distributed over entire venter. Legs well developed, each with a tibio-tarsal articulation and an articulatory sclerosis; total length of each metathoracic leg 614-769 μm long: each coxa 141-189 μm long, trochanter+femer 209-257 μm long, tibia+tarsus 243-311 μm long, claw 17-24 μm long. Tarsal digitules thinner and longer than claw digitules. Spiracles normal, mostly posterior peritreme broader than anterior: anterior peritremes each 37-52 μm wide, posterior peritremes each 45-61 μm wide. Antenna 8-segmented, each 339-399 μm long. Clypeolabral shield 138-157 μm wide.

Host plant.

Recorded from six genera in six families ( García-Morales et al. 2016). In Korea, it was found on Aphananthe aspera ( Cannabaceae ) and Ilex cornuta ( Aquifoliaceae ).

Distribution.

Only known from Japan ( Takahashi 1956); first record for Korea.

Comments.

The above description based on Korean specimens agrees well with that of Takahashi (1956), except that variation in the number of dorsal tubercles and marginal setae, and exact distributions of each type of ventral tubular ducts are newly provided in this study. Coccus malloti probably has intermediate morphological characters between the tribes Coccini and Pulvinariini . However, the woolly test, known as ovisac and one of the typical characters of the Pulvinariini , is not observed in the species. In addition, some slide-mounted specimens of C. malloti contain eggs and nymphs in their body, which indirectly indicates that they would not produce an ovisac for oviposition. Although Coccus malloti would be retained in the tribe Coccini , it needs to be reviewed with its type materials to clarify the exact generic position of the species.