Anomalosiphum, 2006

Quednau, F. W. & Martin, J. H., 2006, Descriptions of two new species of Anomalosiphum (Hemiptera: Aphididae, Greenideinae), including a winged ovipara with pedunculate eggs, Zoological Journal of the Linnean Society 146 (2), pp. 239-249 : 242-244

ANOMALOSIPHUM ESSIGI SP. NOV.

( FIGS 28–38 )

Description

Alate vivipara (from 1 specimen). In slide-mounted specimens head, ant., legs and pronotum brown; mesonotum and siph. more strongly pigmented; sclerotic parts of abd. pale brown; pterostigma pale with dark inner bordering.

Morphology. Discal setae of vertex pointed, 19– 26 µm long. Ant. 0.7 times body length, segm. III moderately swollen with 11 pointed setae 19 µm long; segm. III, IV and base of V bearing 58–61, 14–16 and 1 semiannular sec. sensoria, respectively; lengths of flag. segm., III 0.60, IV 0.26, base V 0.18, pt 0.06. Urs 0.129 long, 1.21 times ht2. Pronotum with about 15 setae, the longest 23 µm long, marginal setae in groups, marginal papillae absent; sides of pronotum spiculose; posterior part of pronotum with a pair of ‘posttergites’. Mesocutellum with 2 setae. Lateral membranous parts of metanotum with 2 setae on each side. Tc1 3: 3: 3. Second tarsal segment with one pair of preapical setae conspicuous, weakly capitate, as long or longer than empodial setae. Dorsal surface of abd. with tergites I and VIII and marginal lobes of tergites I–V spiculose; a few spicules also on tergites V–VII. Dorsal sclerotization of abd. consisting of a band on tergite I, smaller sclerites on tergite II, a large, solid rectangular patch of irregular outline on tergites III–V, and another trapezoid patch on tergites VI and VII, almost coalescing with the former. Intersegmental sclerites developed in front of tergites I, II and VI (VII).

Marginal abd. sclerites developed on tergites II–V with 4–8 setae, the longest 34 µm long. Paramedian abd. setae numerous, pointed, tergite VII bearing 15 and VIII bearing 4 setae (2 on the processes); longest setae of tergites I, VII and VIII are 20, 76 and 102 µm, respectively. Processes on tergite VIII 34 µm long. Marginal papillae undeveloped. Siph. almost cylindrical, 0.27 long, 0.16 of body length, with a subapical ring of 5 setae. Cauda rounded, bearing 6 setae and a short preapical process. Anal plate with about 17 setae. Rudimentary gonapopyses 2. Subgenital plate with 8 setae. Body 1.77 long.

Embryo. Eye a triommatidium. Ant. 4-segmented. Frontal and anterior discal setae blunt, peg-like with barely expanded apices, 6–10 µm long. Dorsal body setae from pronotum to tergite VI minute, peg-like, about 6 µm long. Integument weakly variolose. Otherwise as normal for Anomalosiphum .

Host plant

Unknown (Metasequoia or Dawn Redwood region).

Material examined

HOLOTYPE alate vivipara, CHINA: Hupeh Province , Li-ch’uan, Siu Ho, 14.ix.1948, host unknown (Y.W. Djou) (Essig Museum of the University of California, Berkeley).

Comments. This species was described by Essig (1951) under the name A. pithecolobii Takahashi. However , the latter has a longer apical rostral segment (0.144 long, about 1.85 times ht2). In addition, a close comparison of the embryos revealed that Essig’s specimen is different. The embryo of A. pithecolobii has flabellate dorsal body setae and the siph. bears two minute setae in addition ( Fig. 39 ). In the embryo of A. essigi the dorsal body setae are blunt, peg-like and the siph. is without setae ( Fig. 37 ). Anomalosiphum essigi somewhat resembles A. scleroticum Qiao & G.X. Zhang 2001 in having the sclerites of tergites VI/VII almost coalescing with those of tergites III/V, but differs by more and longer setae on the pronotum and the presence of a secondary sensorium on ant. segm. V. Epithet given in honour of the late professor E. O. Essig.

Anomalosiphum tiomanense was found again by the second author in China ( Hong Kong Island, Pok Fu Lam Country Park ) on Dalbergia sp., 21.xii.2001, 3 apterous, 5 alate viviparae and 3 alatoid nymphs. The apterae differ in having frontal setae 15–19 µm long (8–16 µm in the types) and in the alates submarginal setae on tergite VII are 45–57 µm long (15–19 µm in the types) and the apical setae on the processes of tergite VIII are 80–91 µm long (45– 56 µm in the types). In addition, the embryos from the Hong Kong sample have dorsal body setae peg-like instead with incrassate, denticulate apices ( Figs 41–48 ).

It appears premature to assign the Hong Kong material to a distinct subspecies because the nominate species is known from only a few specimens, all from one locality (north of Kampung Tekek, Pahang Province, West Malaysia) and intraspecific variation cannot be assessed.

Figures

Figures 28–40. Figs 28–39. Anomalosiphum essigi sp. nov., alate vivipara, holotype: 28, body; 29, head and pronotum; 30, ant. segm. III & IV; 31, ant. segm. V; 32, urs; 33, ht2; 34, marginal abd. sclerite; 35, siph.; 36, posterior abd.; 37–38, embryo: 37, body; 38, rostrum. Figs 39–40, A. pithecolobii, embryo: 39, body; 40, rostrum.

Figures 41–48. Variations observed in two populations of Anomalosiphum tiomanense. Figs 41–44, type specimens from West Malaysia: 41, aptera, head and pronotum; 42, alata, posterior abdomen; 43, 44, embryo with rostrum. Figs 45–48, specimens from Hong Kong: 45, aptera, head and pronotum; 46, alata, posterior abdomen; 47, 48, embryo with rostrum.