Ferrisia Fullaway

Pacheco da Silva, Vitor C., Kaydan, Mehmet Bora, Germain, Jean-Francois, Malausa, Thibaut & Botton, Marcos, 2016, Three new species of mealybug (Hemiptera, Coccomorpha, Pseudococcidae) on persimmon fruit trees (Diospyroskaki) in southern Brazil, ZooKeys 584, pp. 61-82 : 68-69

Taxon classification Animalia Hemiptera Pseudococcidae

Genus Ferrisia Fullaway

Ferrisia Fullaway, 1923

Ferrisiana Takahashi, 1929

Type species.

Dactylopius virgatus Cockerell, by monotypy and original designation.

Generic diagnosis

(adapted from Kaydan and Gullan 2012). Adult female. Body elongate to oval, 1.3-5.5 mm long, 0.5-3.0 mm wide. Antennae almost always 8-segmented (sometimes 7-segmented in Ferrisia milleri Kaydan & Gullan and Ferrisia pitcairnia Kaydan & Gullan). Labium 3-segmented, always longer than wide. Posterior pair of spiracles always larger than anterior spiracles. Circulus quadrate, divided by an intersegmental line. Legs well-developed, with or without translucent pores on hind coxa, femur and tibia; claw without a denticle; tarsal and claw digitules both capitate, claw digitules thicker than tarsal digitules. Posterior ostioles well-developed; anterior ostioles usually more weakly developed than posterior pair, or absent. Anal lobes well developed. Anal ring typically with 6 anal ring setae.

Description.

Dorsum. With long enlarged ducts, each with the orifice surrounded by a circular sclerotized rim, either containing short setae or with setae just outside border. In living insects, these ducts secrete long glassy filaments typical of the genus. Cerarii confined to anal lobes; each anal lobe usually with 2 enlarged conical setae (more on some specimens of Ferrisia dasylirii Cockerell and Ferrisia virgata (Cockerell)) plus an associated cluster of trilocular pores and a few auxiliary setae. Body setae slender and flagellate, bluntly tipped to slightly capitate, and of various sizes. Trilocular pores each 3-5 μm in diameter, often slightly larger (4-5 μm diameter) than ventral trilocular pores (typically 3-5 μm), scattered over the dorsum. Minute discoidal pores on the dorsal submargin of the head at base of antennal segment I, usually in a small tight cluster of 3-8 pores (often difficult to see), and also associated with enlarged tubular ducts (generally present within sclerotized area surrounding duct rim). Enlarged tubular ducts present mostly on body margin and submargin in segmental clusters, but often also present medially and submedially; duct opening of each tubular duct with a sclerotized rim surrounded by a circular sclerotized area bearing 0-3 (generally 1 or 2) minute discoidal pores (appearing as clear areas in the cuticle) and with 1-7 (generally 3-5) blunt-tipped to slightly capitated setae. Oral-collar tubular ducts and multilocular pores absent.

Venter. Body setae slender, blunt-tipped to slightly capitate, and of various sizes. Trilocular pores each 2.5-5.0 μm in diameter, scattered over surface. Minute discoidal pores scattered throughout the venter, almost always associated with ventral oral-collar tubular ducts. Enlarged tubular ducts absent. Oral-collar tubular ducts of one or more sizes, of various lengths and widths, shortest ducts often present in marginal clusters, at least on posterior abdominal segments; ducts on anterior abdomen and margins or submargins of posterior abdomen often associated with a minute discoidal pore (rarely 2 pores), usually appearing as a clear circular to oval area in cuticle. Multilocular disc pores generally present (absent in Ferrisia meridionalis Williams) on posterior abdominal segments, especially around the vulva.

Key to adult females of Ferrisia from the Neotropical Region

(adapted from Kaydan and Gullan (2012)). The key includes only species displaying the following combination of features: (i) ventral oral-collar tubular ducts of at least 2 sizes, smaller ducts present singly or in segmental clusters on the body margin, at least on the last 2 or 3 abdominal segments, and (ii) minute discoidal pores in sclerotized area of enlarged tubular ducts, touching the sclerotized rim of the duct opening.