Mealybugs of the Genus Rhizoecus Künckel D'herculais, 1878 (Homoptera: Pseudococcidae) of the Fauna of Russia and Adjacent Co
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ZOOSYSTEMATICA ROSSICA, 18(2): 224–245 25 DECEMBER 2009 Mealybugs of the genus Rhizoecus Künckel d’Herculais, 1878 (Homoptera: Pseudococcidae) of the fauna of Russia and adjacent countries E.M. DANZIG & I.A. GAVRILOV E.M. Danzig & I.A. Gavrilov, Zoological Institute, Russian Academy of Sciences, Universitetskaya Emb., 1, St. Petersburg 199034, Russia. E-mail: [email protected] A key and a review of 15 species inhabiting the territory of the former USSR are given. Rhizoecus microtubulatus Gavrilov & Danzig sp. nov. from Astrakhan is described. All discussed species are briefly morphologically described and illustrated. The lectotype is designated for Rh. vitis Borchsenius, 1949. Four new synonyms are established: Rhizoecus poltavae Laing, 1929 = Rh. desertus Ter-Grigorian, 1967 syn. nov. = Rh. pallidus Tereznikova, 1968 syn. nov.; Rh. tritici Borchsenius, 1949 = Rh. pratensis Borchsenius & Tereznikova, 1959 syn. nov.; Rh. albidus Goux, 1942 = Rh. gentianae Panis, 1968 syn. nov. Key words: scale insects, Homoptera, Pseudococcidae, Rhizoecus, new species TAXONOMIC PART more) flagellate setae on dorsal side and usually with one apical setae on ventral side Genus Rhizoecus Künckel d’Herculais, 1878 of the same size as dorsal ones. Antennae with six or very rarely five broad, densely Rhizoecus Künckel d’Herculais, 1878: 163 settled segments. Legs short, with broad Rhizoecus: Hambleton, 1946: 50; 1976: 6; Borch- segments. Claw elongated. Coxae and tibiae senius, 1949: 174, Ferris, 1953: 426; McKen- without translucent pores. Ostioles poorly zie, 1967: 126; Danzig, 1980: 196; Ter-Grigo- visible, sometimes without trilocular pores rian, 1973: 89; Tereznikova, 1975: 246; Сox, 1987: 84; Tang, 1992: 53; Williams & Gran- and slender setae. Circulus usually present, ada de Willink, 1992: 494; Williams & Wat- more often conical and sclerotized, with cel- son, 1988: 213; Williams, 2004: 746; Kozár & lular pattern. Anal ring with 6 flagellate set- Benedicty, 2007: 126. ae and few distinctive large elongated pores. Ripersiella Tinsley, in Cockerell, 1899: 278 (type Multilocular pores usually present, located species Ripersia rumicis Maskell, 1892 by ori- on posterior abdominal sternites, rarely nu- ginal designation). merous on both body sides [Rh. poltavae á Ripersiella: Koz r & Benedicty, 2007: 380. Laing, 1929, Rh. brevipes (Goux, 1943)]. Pararhizoecus Goux, 1941: 197 (as subgenus; Trilocular pores numerous on both body type species Pararhizoecus petiti Goux, 1941 sides. Tubular ducts of different size and by monotypy). number. Peculiar bi- and tritubular ducts Type species: Rhizoecus falcifer Künckel are characteristic. Their length is usually d’Herculais, 1878 by monotypy. comparable to multilocular pores diameter. Diagnosis of the genus. Adult female. Sometimes tritubular pores can be signifi- Body elongate oval, often with almost par- cantly larger (Rh. vitis Borchsenius, 1949), allel margins, up to 2 mm long, covered and bitubular to the contrary smaller. Some with white powder wax; during the oviposi- species (for example, Rh. parvus Danzig, tion period females extract a loose wax sac. 1985) lack those ducts completely. Flagel- Anal lobes poorly developed, sometimes late and slender setae approximately equal with sclerotized plate, with two (sometimes on both body sides. © 2009 Zoological Institute, Russian Academy of Scienсes E.M. DANZIG & I.A. GAVRILOV. MEALYBUGS OF THE GENUS RHIZOECUS OF RUSSIA 225 Mode of life. According to the mode of 1. Rhizoecus dianthi Green, 1926 life the majority of Rhizoecus species can (Fig. 1) be referred to soil insects; they live on thin roots of different plants, mostly perennial Rhizoecus dianthi Green, 1926: 175. Rhizoecus dianthi: Williams, 1962: 43; Cox, 1987: herbs, and only in rare cases inhabit over- 86; Kozár & Benedicty, 2007: 196; Danzig et head parts of host plants additionally. The al., 2008: 600. life cycle is typical for all mealybugs. Some Rhizoecus eluminatus McKenzie, 1960: 747 species are ovoviviparous laying eggs at the (USA: California). stage of germ band invagination or even Rhizoecus eluminatus: McKenzie, 1967: 388. with fully developed larvae inside (Tra- Rhizoecus pritchardi McKenzie, 1960: 749 (USA: peznikova & Gavrilov, 2008). At present, California). only five species are cytogenetically inves- Rhizoecus pritchardi: McKenzie, 1967: 400; Wil- liams & Nakahara, 1980: 336. tigated. Two species possess 2n=12, two 2n=10 and one 2n=8; all those five species Material. Five females from St. Petersburg, are characterized by a Lecanoid genetic several tens of series from Moscow: the Main Bo- system and bisexual reproduction (Nur et tanical Garden of the Russian Academy of Sci- ences, series of females from England (ZIN). al., 1987; Gavrilov, 2007; Gavrilov & Tra- Description. Adult female. Ostioles well- peznikova, unpubl.). developed. Circulus absent. Multilocular The genus is distributed all over the pores few, located only on three posterior world and comprises more than 200 spe- abdominal sternites. Tritubular ducts of cies. Due to the concealed mode of life and common size, few on dorsal body surface polyphagia some species have distributed and along margin of ventral body surface, together with the introduced host plants sometimes part of ducts accompanied by 1 far beyond their natural ranges. The fauna or 2 flagellate setae. Tubular ducts absent. of Russia and adjacent countries contains Systematical note. The species concerned 15 species of the genus, three of which are is probably identical to Rh. cyperalis (Ham- non-indigenous having been introduced belton, 1946) and Rh. nemoralis (Hambel- from North America and live only in green- ton, 1946) described from Central America, houses. In Western Europe there are some that was noted previously (Williams, 1962; more species of Rhizoecus. These are species Williams, Granada de Willink, 1992). from South France and Italy Rh. brevipes, Distribution. Reported only from green- Rh. brussieui (Goux, 1985), Rh. ovoides houses. Russia: St. Petersburg, Moscow. (Goux, 1943), Rh. periolanus (Goux, 1985), Europe, USA, Australia and New Zealand. Rh. petiti, Italian Rh. lelloi Mazzeo, 1995, Mode of life. Widely polyphagous on Rh. vidanoi Marotta & Tranfaglia, 1995 flowering plants. In St. Petersburg, it was and still not interpreted Rh. (?) targionii collected from Ophiopogon sp. (family Lili- (Cockerell, in Fernald, 1903), and also aceae). In Moscow, found on a range of plants two species described from Germany – Rh. in cactuses and succulents department. caesii Schmutterer, 1956 and Rh. franco- When the infestation is heavy the root sys- niae Schmutterer, 1956. tem and soil are entirely covered with white In greenhouses of Europe the follow- fluffy wax (Kozarzhevskaya, 1992). Serious ing species are also recorded according to pest of Saintpaulia spp. in California, cause the data of Jansen (2004): Rh. advenoides leaf shrinkage and plants death. Takagi & Kawai, 1971, Rh. aloes Williams & Pellizzari, 1997, Rh. americanus (Hamble- 2. Rhizoecus cacticans (Hambelton, 1946) ton, 1946), Rh. amorphophalli Betrem, 1940, (Fig. 2) Rh. elongatus Green, 1926, Rh. falcifer, Rh. hibisci Kawai & Takagi, 1971 and Rh. maas- Ripersiella cacticans Hambelton, 1946: 64 (Ec- bachi Jansen, 2003. uador). © 2009 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 18(2): 224–245 226 E.M. DANZIG & I.A. GAVRILOV. MEALYBUGS OF THE GENUS RHIZOECUS OF RUSSIA 1 Fig. 1. Rhizoecus dianthi, female, after Danzig et al. (2008), with specification. © 2009 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 18(2): 224–245 E.M. DANZIG & I.A. GAVRILOV. MEALYBUGS OF THE GENUS RHIZOECUS OF RUSSIA 227 Fig. 2. Rhizoecus cacticans, female, Moscow, greenhouse. © 2009 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 18(2): 224–245 228 E.M. DANZIG & I.A. GAVRILOV. MEALYBUGS OF THE GENUS RHIZOECUS OF RUSSIA Ripersiella cacticans: Ferris, 1953: 432; Ham- Mode of life. Collected from Tanacetum belton, 1976: 17; Zahradnik, 1990: 41; Ko- vulgaris and Festuca sp. zarzhevskaya, 1992: 219; Kozár & Benedicty, 2007: 168. Rhizoecus inconspicuus Rhizoecus epiphylli Ferris, 1953: 442 (USA: Cali- 4. Danzig, 1971 fornia, Ontario). (Fig. 4) Rhizoecus epiphylli: McKenzie, 1960: 745 (= R. Rhizoecus inconspicuus Danzig, 1971: 372 (South cacticans). of Primorsk Terr.). Material. Large series from Moscow: the Rhizoecus inconspicuous: Danzig, 1980: 196. Main Botanical Garden of the Russian Academy Rhizoecus inconspicuus: Kozár & Benedicty, of Sciences, 14 specimens from St. Petersburg, 2007: 230. Minsk, Kiev, Donetsk and England (ZIN). Material. Holotype and paratypes (ZIN). Description. Adult female. Ostioles poor- Description. Adult female. Ostioles well- ly developed. Circulus conical, heavily scle- developed. Circulus conical. Anal lobes in rotized. Multilocular pores absent. Tritubu- holotype with a sclerotized plate with 3 lar ducts of common size, sparsed through- long and 1 or 2 shorter flagellate setae. Mul- out dorsal body surface, few along margin of tilocular pores few, located on three poste- ventral body surface. Tubular ducts narrow, rior abdominal segments. Tritubular ducts with parallel sides, few on both body sides. of common size, forming transverse rows on Distribution. Distributed throughout dorsal body surface, occur along the margin tropics and subtropics. In Russia and Eu- of ventral body surface. Tubular ducts short rope is common in greenhouses. and narrow, with parallel sides, numerous Mode of life. Polyphagous, live