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Ovaries of Puto Superbus and Ceroputo Pilosellae (Hemiptera: Coccoidea): Morphology, Ultrastructure, Phylogenetic and Taxonomic Implications

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Ovaries of Puto Superbus and Ceroputo Pilosellae (Hemiptera: Coccoidea): Morphology, Ultrastructure, Phylogenetic and Taxonomic Implications Title: Ovaries of Puto superbus and Ceroputo pilosellae (Hemiptera: Coccoidea) : morphology, ultrastructure, phylogenetic and taxonomic implications Author: Anna Michalik, Małgorzata Kalandyk-Kołodziejczyk, Ewa Simon, Michał Kobiałka, Teresa Szklarzewicz Citation style: Michalik Anna, Kalandyk-Kołodziejczyk Małgorzata, Simon Ewa, Kobiałka Michał, Szklarzewicz Teresa. (2013). Ovaries of Puto superbus and Ceroputo pilosellae (Hemiptera: Coccoidea) : morphology, ultrastructure, phylogenetic and taxonomic implications. "European Journal of Entomology" (2013, no. 3, s. 527-534), doi 10.14411/eje.2013.070 Eur. J. Entomol. 110(3): 527–534, 2013 http://www.eje.cz/pdfs/110/3/527 ISSN 1210-5759 (print), 1802-8829 (online) Ovaries of Puto superbus and Ceroputo pilosellae (Hemiptera: Coccoidea): Morphology, ultrastructure, phylogenetic and taxonomic implications 1 2 2 1 ANNA MICHALIK , MAŁGORZATA KALANDYK-KOŁODZIEJCZYK , EWA SIMON , MICHAŁ KOBIAŁKA 1 and TERESA SZKLARZEWICZ 1 Department of Developmental Biology and Morphology of Invertebrates, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387 Kraków, Poland; e-mail: [email protected] 2 Department of Zoology, Faculty of Biology and Environmental Protection, University of Silesia, Bankowa 9, 40-007 Katowice, Poland Key words. Hemiptera, Coccoidea, Puto superbus, Ceroputo pilosellae, ovariole, germ cells, trophocyte, oocyte, scale insects Abstract. Ovaries of Puto superbus and Ceroputo pilosellae are composed of numerous short telotrophic ovarioles that are arranged around the distal part of the lateral oviduct. An individual ovariole consists of a distal trophic chamber (= tropharium) and proximal vitellarium. The tropharia enclose individual trophocytes (= nurse cells) and early previtellogenic oocytes termed arrested oocytes. A single oocyte develops in each vitellarium. Analysis of serial sections has shown that ovarioles of P. superbus contain from 16 to 51 germ cells (13–43 trophocytes, 2–7 arrested oocytes, 1 developing oocyte) while those of C. pilosellae from only 8 to 10 germ cells (5–7 trophocytes, 0–2 arrested oocytes, 1 developing oocyte). The classification and phylogeny of scale insects are discussed taking into consideration the results of this study. INTRODUCTION rocerococcus Leonardi, 1907 (e.g. Borchsenius, 1949; Scale insects (coccoids) are classified as the super- Koteja, 1974) and more recently to Puto (e.g. Tereznik- family Coccoidea in the suborder Sternorrhyncha within ova, 1975; Marotta & Tranfaglia, 1993; Kosztarab & the order Hemiptera. The Coccoidea superfamily contains Kozár, 1988; Williams et al., 2011). Genus Puto was con- nearly 8000 species worldwide (Gullan & Martin, 2009). sidered to belong to Pseudococcidae (e.g. Koteja, 1974; Informally coccoids are subdivided into two groups: Danzig, 1986, 1999; Kosztarab & Kozár, 1988) or Archaeococcoidea (archaeococcoids or archaeococcids) Putoidae (Beardsley, 1969; Cook et al., 2002; Gullan & with about 700 species and Neococcoidea (neococcoids Cook, 2007; Gullan & Martin, 2009; Kondo et al., 2008, or neococcids) with over 7000 species (see e.g. Borchsen- Williams et al., 2011). The family Putoidae was placed ius, 1958; Cook et al., 2002; Gullan & Cook, 2007; with either the archaeococcoids (Gullan & Cook, 2007; Kondo et al., 2008; Gullan & Martin, 2009 for further Gullan & Martin, 2009; Kondo et al., 2008) or neococ- details). In spite of numerous earlier morphological and coids (Koteja & Azar, 2008). Gavrilov-Zimin & Danzig even most recent molecular studies, the classification of (2012) did not accept the concept presented by Williams the Archaeococcoidea remains a matter of debate. et al. (2011) and placed Puto within the family Pseudo- Archaeococcoids have many plesiomorphic features coccidae. (XX–XO sex chromosome system, abdominal spiracles The genus Ceroputo that was synonymized with the and generally compound eyes in males). Thus, their genus Puto (Ferris, 1918) was resurrected by Hardy at al. monophyletic origin is not evident. In contrast to the (2008) and is now considered to be one of the genera of archaeococcoids, neococcoids are a monophyletic group, the Pseudococcidae placed in the subfamily Phenacocci- characterized by derived features (e.g. paternal genome nae. elimination and absence of abdominal spiracles) (Koteja, As in all hemipterans, ovaries of scale insects, are com- 1974, 1996; Foldi, 1997; Cook et al., 2002; Gullan & posed of ovarioles of telotrophic type (for classification Cook, 2007, Gullan & Martin, 2009). There are, however, and organization of insect ovaries see Biliński, 1998; numerous structures that indicate the rich diversity and Büning, 1994). An individual ovariole of hemipterans intermediate states of these two groups (Koteja 2000, consists of a terminal filament, trophic chamber (trophar- 2004, 2008; Koteja & Poinar, 2001; Koteja & Azar, ium), vitellarium and ovariolar stalk (pedicel). The latter 2008). element joins the ovariole to the lateral oviduct. The tro- One of the important taxonomical problems concerning pharium encloses trophocytes (nurse cells) and early mei- the Coccoidea is the position of the genus Puto Signoret, otic oocytes (termed arrested oocytes). Linearly arranged 1875. Puto superbus was originally described by Leon- developing oocytes are present in the vitellarium. ardi (1907) as Macrocerococcus superbus. This species Numerous extensive studies on the ovaries of representa- was assigned to different genera by many authors: to tives of various hemipteran suborders (i.e. aphids, scale Ceroputo Šulc, 1898 (e.g. Lindinger, 1912), to Mac- insects, psyllids, whiteflies, cicadomorphans, fulgoromor- 527 phans and heteropterans), have shown that in spite of Będzin (Southern Poland) in April. Adult females of Puto numerous morphological differences between them they superbus were collected from the grass, Arrhenatherum elatius share several synapomorphic characters: (1) in each in Katowice (Southern Poland) and near Wolsztyn (Western ovariole only a single cluster of germ cells (oocytes and Poland) in June. trophocytes) is present, (2) in each cluster more than one Light and transmission electron microscopy oocyte develops and (3) the centre of the tropharium is The dissected ovaries were fixed in 2.5% glutaraldehyde in occupied by a common cytoplasmic area filled with 0.1 phosphate buffer (pH 7.4) for 3 months. The material was microtubules, termed a trophic core (e.g. Büning, 1985; then rinsed in the same buffer with the addition of sucrose (5.8 Książkiewicz-Kapralska, 1985; Huebner, 1981; Biliński g/100 ml) and postfixed for 1.5 h in 1% osmium tetroxide and et al., 1990; Simiczyjew et al., 1998; Szklarzewicz, dehydrated in a graded series of ethanol and acetone. The mate- rial was next embedded in epoxy resin Epon 812 (Serva, Heidel- 1998a; Štys et al., 1998; Szklarzewicz et al., 2000, 2009). berg, Germany). Semithin sections (1 µm thick) were stained In contrast to the ovarioles of other hemipterans, the with 1% methylene blue in 1% borax and photographed with the ovarioles of scale insects do not possess terminal fila- aid of Nikon Eclipse 80i and Leica DMR microscopes. Ultrathin ments and contain a small number of germ cells in each sections (90 nm thick) were contrasted with uranyl acetate and ovariole and single oocyte in the vitellarium (scale insect lead citrate and examined under a JEOL JEM 100SX electron synapomorphies) (Książkiewicz, 1980; Szklarzewicz & microscope at 80 kV. Biliński, 1995; Szklarzewicz, 1997, 1998a, b, c; Koteja et Fluorescence microscopy al., 2003; Szklarzewicz et al., 2002, 2005, 2010, 2013; The dissected ovaries were fixed in 4% formaldehyde in Niżnik & Szklarzewicz, 2007). It is noteworthy that their phosphate buffered saline (PBS) for 45 min at room tempe- ovaries appeared to be so different from those of other rature. The material was next rinsed in the same buffer and hemipterans that they were formerly classified as polytro- stained in a mixture of rhodamine-labeled phalloidin (2 µg/ml) phic (Jura, 1958; Magakyan et al., 1975). Szklarzewicz and DAPI (12 µg/ml) for 90 min in complete darkness. Stained and co-workers in a series of papers have shown that the ovaries were examined using an Axiovert 200M confocal micro- ovaries of archaeococcoids exhibit significant differences scope. in their organization from those of neococcoids (Szklarze- RESULTS wicz & Biliński, 1995; Szklarzewicz, 1997, 1998a, b, c; Szklarzewicz et al., 2002, 2005, 2010, 2013; Koteja et al., Gross morphology of the ovaries of Puto superbus and 2003; Niżnik & Szklarzewicz, 2007). First, the ovarioles Ceroputo pilosellae of archaeococcoids contain a greater number of germ The ovaries of Puto superbus and Ceroputo pilosellae cells (trophocytes + oocytes) than those of neococcoids. are composed of numerous (about 200) short telotrophic Second, tropharia of archaeococcoids contain trophocytes ovarioles in various stages of development (Fig. 1A). The and arrested oocytes (except for members of the family ovarioles protrude radially from along two thirds of the Monophlebidae), whereas those of neococcoids contain length of the lateral oviduct (Fig. 1A). They are con- only trophocytes (except for members of the families Ker- nected with the lateral oviduct by very short ovariolar mesidae and some representatives of Eriococcidae). stalks (Fig. 1A). Moreover, the arrested oocytes of archaeococcoids may Structure of an ovariole develop, whereas those of neococcoids are not capable of further development. As a consequence, in each ovariole
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