Search

Dialeurolobus Danzig Dialeurolobus Danzig, 1964: 634. Type species: Dialeurolobus pulcher Danzig, 1964, by monotypy and original designation. The genus Dialeurolobus was described by Danzig (1964) to accommodate a single new species, Dialeurolobus pulcher Danzig, from the Caucasus region of Russia. Currently, the genus contains three species, namely D. erythrinae (Corbett, 1935), D. pulcher Danzig, 1964 and D. rhamni Bink-Moenen, 1992 (Martin & Mound, 2007; Evans, 2007). Aleuromarginatus erythrinae Selvakumaran & David, 1996, was synonymized with D. erythrinae (Corbett) by Martin & Mound (2007). Martin et al. (2000) noted that D. rhamni may prove to be a synonym of D. pulcher. Species of Dialeurolobus occur in the Middle East, India, the eastern Palaearctic region, Korea and Malaysia. They feed on plant species belonging to the Fabaceae, Lythraceae, Rhamnaceae, Rosaceae and Rutaceae (Martin et al., 2000; Lee et al., 2005; Evans, 2007; Martin & Mound, 2007; Suh & Hodges, 2008). Little appears to have been published on the biologies of these particular whiteflies. The life cycle of D. rhamni, on the deciduous plant Rhamnus lycioides in the Mediterranean area, was studied by Gerling and Ben-Ari (2010). They provided an account of the adaptation of D. rhamni to the life cycle of its host plant, with regard to the overwintering mode of this insect. The genus Dialeurolobus is not readily definable by a diagnosis to which all its included species conform. In general, the puparia are dark (one species is pale), with a crenate margin, and the transverse moulting sutures may curve strongly forward. Abdominal segment VIII is trilobate, the median length of segment VII is reduced, and there is no submarginal fold or suture around the dorsum. The vasiform orifice is triangular, almost fully occupied by the operculum. First abdominal setae are present or absent, cephalic setae are present and thoracic setae are usually absent. Small combs are usually evident in the thoracic and caudal tracheal areas. Dialeurolobus is very similar to Aleurolobus Quaintance & Baker, 1914, from which it differs by not having a dorsal submarginal suture (Danzig, 1964). Dialeurolobus, or at least its type species D. pulcher, also closely resembles Zaphanera Corbett, 1926, but differs mainly by having a caudal furrow and triangular vasiform orifice (Martin, 1999). The transverse moulting sutures of D. pulcher and D. rhamni curve strongly forward, which is a characteristic feature of Zaphanera. Like Zaphanera, Dialeurolobus has a crenate margin, no dorsal sbmarginal fold, and there are general similarities in the chaetotaxy of these two genera., Published as part of Millar, I. M. & Dooley, J. W., 2013, A new species of Dialeurolobus (Hemiptera: Aleyrodidae) from Protea nitida in South Africa, pp. 178-184 in Zootaxa 3694 (2) on pages 179-180, DOI: 10.11646/zootaxa.3694.2.7, http://zenodo.org/record/220728

Key to the puparia of Dialeurolobus species 1. Puparium pale, surrounded by row of 54 whitish wax rods; puparium with a submarginal row of 54 rounded papillae; caudal furrow present; with a pair of metathoracic setae............................................ erythrinae (Corbett) - Puparium black or brownish-black, rarely pale, with or without a marginal wax fringe; puparium lacking a submarginal row of papillae; caudal furrow present or absent; metathoracic setae absent............................................. 2 2. Caudal furrow and eyespots present, distinct; first abdominal setae present; unmounted puparium with a vertical column of hyaline wax 1 mm long in middle of dorsum.................................................... pulcher Danzig - Caudal furrow faint or absent; eyespots present or absent; first abdominal setae absent; unmounted puparium without a vertical column of hyaline wax................................................................................. 3 3. Eyespots present, caudal furrow faint; caudal setae present, and 12 pairs of setae in a row along submargin/subdorsum area; tracheal combs with 2���3 teeth; transverse moulting suture curved abruptly anteriad................ rhamni Bink-Moenen - Eyespots, caudal furrow and caudal setae absent; 8 pairs of setae in a row along submargin/subdorsum area; tracheal combs with about 4���7 teeth; transverse moulting suture only moderately curved anteriad...................... proteae sp. nov., Published as part of Millar, I. M. & Dooley, J. W., 2013, A new species of Dialeurolobus (Hemiptera: Aleyrodidae) from Protea nitida in South Africa, pp. 178-184 in Zootaxa 3694 (2) on page 183, DOI: 10.11646/zootaxa.3694.2.7, http://zenodo.org/record/220728

Millar, I. M., Dooley, J. W. (2013): A new species of Dialeurolobus (Hemiptera: Aleyrodidae) from Protea nitida in South Africa. Zootaxa 3694 (2): 178-184, DOI: http://dx.doi.org/10.11646/zootaxa.3694.2.7

Dialeurolobus proteae sp. nov. (Figs 1���9) PUPARIUM Habitus. Body colour black, requiring bleaching (Fig. 9); puparia distributed sparsely on underside of leaf. Sparse powdery wax present on dorsum. Margin. Outline broadly oval, 1.20���1.86 [1.60] mm long by 1.01���1.60 [1.36] mm wide, with the holotype being 1.86 mm long, 1.60 mm wide, 1.16 times longer than wide, widest at A 3 (third abdominal) segment (n= 17). Margin evenly crenate, with 6���8 rounded teeth per 0.1 mm of margin; 4���7 slightly smaller teeth at thoracic (Fig. 7) and abdominal tracheal openings. Dorsum. Boundary between submedian and subdorsal areas of dorsal disc not distinctly indicated. Longitudinal moulting suture extending up to the basal border of the submargin; transverse moulting sutures extending to and terminating near submargin; metathoracic suture present and extending to but not overlapping the mesothoracic legs. Submargin to the subdorsum with linear pattern that is straight and parallel; subdorsum to submedian roughened. Thoracic and abdominal segmentation clearly marked submedially, rachis present; abdominal segment VII reduced by 5 ��m in length medially; abdominal segment VIII trilobate; each abdominal segment with pair of slightly elongated depressions. Vasiform orifice elongate-cordate, 72.6���92.6 [83.6] ��m long by 50���82 [69.7] ��m wide, with inner edges ridged, anterior half with fine stipples. Operculum elongate-triangular, 56.9���72.6 [66.0] ��m long by 47.9���67.8 [61.2] ��m wide with rounded angles, occupying most of orifice and covering lingula; head of lingula globular, 47.4���63.6 [57.8] ��m long by 19.1���27.8 [24.4] ��m wide, finely setose with a pair of subapical setae. Pores. Paired geminate pore with associated porette present with collars and separated from each other by a distance of about 1���3 times the diameter of the pore (Fig. 1); distributed over dorsal disc from median to the submargin, where the pores are arranged in an irregular row of one to two pairs with some pores having two porettes associated with each. Chaetotaxy. Anterior and posterior marginal setae present (most broken off). Anterior marginal setae 9.7���14.6 [11.2] ��m long; posterior marginal setae 8.6���34.3 ��m long. Submedian dorsal area comprises single pairs of cephalic setae 6.7���12 [9.6] ��m long (most broken off) and 8 th abdominal setae 6.1���19.5 [10.5] ��m, each hair fine, pointed and curved; subdorsal chaetotaxy comprises 8 pairs of similar setae, 7���13 [10] ��m long, arranged in a line extending around puparium, with 3 pairs on the thorax and 5 on the abdomen. Venter (Fig. 1). Cuticle diaphanous, with cellular/areolate pattern through subventral area, smooth submedially. Thoracic and caudal tracheal folds apparent. Ventral abdominal setae placed on either side of anterior angles of vasiform orifice, finely pointed and 16���25 ��m long. Legs with apical adhesive pad; each leg with a small basal seta, slightly longer than its base. Antennae extending approximately to podite of middle legs; antennal bases placed anterior to fore legs. Material examined. HOLOTYPE. Puparium on slide, SOUTH AFRICA, Western Cape, Cedarberg Nature Reserve, approx. 32 ˚ 25 ���S 19 ˚05���E, 10.xii. 1991, C. Roux, on Protea nitida (Proteaceae), HAl 76 (SANC). PARATYPES. 21 puparia on 11 slides, same data as holotype (SANC), 2 puparia on 2 slides (BMNH), 2 puparia on 2 slides (USNM), 6 puparia on 3 slides (PPQC); 2 puparia on 2 slides, collected in Quarantine from South Africa on Protea flowers on 5.iii. 2001 at Los Angeles Plant Inspection station, Hawthorne, Ca, USA, reference laxca010711601640 (PPQC), 1 slide (BMNH). Additional, non-type material. 8 dry specimens in situ on leaf fragments glued to 5 card platforms on pins, same data as holotype (SANC). Distribution. Only known to occur in the Western Cape Province of South Africa. Host plant. Protea nitida Mill. (Proteaceae). This plant is endemic to South Africa, where it occurs in the Western and Eastern Cape provinces. It is a large, common protea species that grows into a tree, and is valued for its showy flowers and timber (Coates Palgrave, 2002). Etymology. The name is derived from the host plant genus, Protea. Comments. Dialeurolobus proteae sp. nov. differs from the other three species in this genus mainly by the morphological characters mentioned in the key below. It is most similar to D. rhamni, but has fewer pairs of setae in the submargin/subdorsum area, and more teeth in the tracheal combs. It also lacks eyespots, a caudal furrow, and caudal setae; all of these structures are present in D. rhamni. Also, the transverse moulting sutures in D. rhamni are curved abruptly anteriad, whereas in D. proteae they are more conventional in shape., Published as part of Millar, I. M. & Dooley, J. W., 2013, A new species of Dialeurolobus (Hemiptera: Aleyrodidae) from Protea nitida in South Africa, pp. 178-184 in Zootaxa 3694 (2) on pages 180-181, DOI: 10.11646/zootaxa.3694.2.7, http://zenodo.org/record/220728