Macroporicoccus Nan & Wu, 2013

Nan, Nan, Deng, Jun & Wu, San’An, 2013, A new felt scale genus Macroporicoccus gen. n. (Hemiptera: Coccoidea: Eriococcidae) from China, with a redescription of Macroporicoccus ulmi (Tang & Hao) comb. n., Zootaxa 3722 (2), pp. 170-182 : 172

Macroporicoccus Nan & Wu gen. n.

Type species: Cryptococcus ulmi Tang & Hao, 1995 .

Description. Adult female: Body in life subglobular, orange-red, covered by a white ovisac. On slide, body circular or ovate. Antennae reduced, 6-segmented. Mouthparts developed, labium 3-segmented. Thoracic spiracles each with a group of disc pores, each with 3 or 5 loculi, near opening. Legs much reduced, only distal part of tarsus and complete claw visible; each claw with a denticle, hind legs each located on a pore plate. Anal ring circular or oval, with 6 short setae and no pores. Anal lobes indistinct. Macrotubular ducts with a cup-shaped invagination, present on both sides of body except ventral middle area. Microtubular ducts present on dorsum and margin of venter. Quinquelocular pores mainly present ventrally. Macrodisc pores present on dorsum and margin of venter. Setae small, sparsely distributed on venter.

First-instar nymph: In life, body bright yellow. Body on slide oval. Antennae 6-segmented. Eyes present. Mouthparts and legs well developed. Anal ring circular, with 6 setae and without pores. Anal lobes each with one long and one short flagellate seta. Macrotubular and microtubular ducts absent. Quinquelocular disc pores present on ventral abdominal segments and near spiracles. Macrodisc pores distributed on dorsal surface. Setae present, forming transverse or longitudinal rows on body surface.

Remarks. Adult females of Macroporicoccus Nan & Wu gen. n. can be easily distinguished from other eriococcid genera due to the presence of macrodisc pores, which occur throughout the dorsum and ventral margin of C. ulmi . Tang and Hao (1995) described this type of pore as a macroduct, but they noticed also that it was a rather large disc pore; Wu (2000) referred to it as a macrodisc pore and described it as a kind of large invaginated pore. As this pore is markedly larger than the simple pores in other Coccoidea (usually 2–3 µm in diameter), we consider the term macrodisc pore to be most appropriate. However, after SEM study, we can confirm that it is a simple closed pore ( Foldi, 1997), about 10 µm in diameter, with a narrow rim and a weakly convex surface ( Fig. 20 , 21 ); it secretes long solid wax filaments, which make up the outline of the ovisac ( Fig. 3 ) (Wu, unpublished data).

Cryptococcus , Kuwanina Cockerell and the new genus Macroporicoccus live in crevices in the trunks and branches, and have many similar morphological characters. The shared features of the adult female are: (1) body subglobular covered by a white ovisac; (2) antennae reduced; (3) legs absent or reduced to tubercles, hind legs always replaced by pore-plates or vestigial flaps; and (4) anal lobes absent ( Williams, 1985; Tang & Hao, 1995; Wu, 2000; Henderson, 2007; Wu & Liu, 2009). However, adult female Kuwanina apparently differ from those of other two genera in the absence of macrotubular ducts ( C. nudata Brittin is an exception) and in the presence of unique invaginated 5-locular disc pores ( Williams, 1985; Henderson, 2007). As indicated above, adult female Macroporicoccus differ from Cryptococcus in the presence of macrodisc pores. In addition, Macroporicoccus has 6-segmented antennae whereas Cryptococcus has 1–4-segmented antennae ( Kosztarab & Hale, 1968; Tang & Hao, 1995).

Etymology. The new genus name means those scale insects with macrodisc pores.

Figures

FIGURE 3. Adult female Macroporicoccus ulmi (Tang & Hao) in crevices of Ulmus pumila, Beijing of China (San-An Wu).

FIGURES 13–20. Scanning electron micrographs of some features of adult female Macroporicoccus ulmi (Tang & Hao). 13. fore leg (×3,000); 14. middle leg (×3,200); 15. hind leg (×3,000); 16. pore plate (×1,500); 17. anal ring (×2,000); 18. vulva (×1,000); 19. macrotubular duct (×5,000); 20. macrodisc pore (×5,000).

FIGURES 21–22. Scanning electron micrographs of some features of adult female Macroporicoccus ulmi (Tang & Hao). 21. macrodisc pore (×5,000); 22. ventral seta (×5,000).