Jacksonia Theobald, 1923

Li, Xing-Yi, Zhang, Bin, Su, Xiao-Mei & Qiao, Ge-Xia, 2013, First record of the aphid genus Jacksonia Theobald (Hemiptera, Aphididae, Aphidinae) from China, with description of one new species, ZooKeys 312, pp. 79-87 : 79-80

Jacksonia Theobald, 1923

Jacksonia Theobald 1923: 19. Type species: Jacksonia papillata Theobald, 1923; 19-20 & Figs A–E, by monotypy.

Jacksonia Theobald: Eastop and Hille Ris Lambers 1976: 229; Miyazaki 1971: 112; Raychaudhuri 1980: 154; Ghosh 1986: 92; Heie 1994: 43; Remaudière and Remaudière 1997: 105; Blackman and Eastop 2006: 1183.

Generic diagnosis.

In apterous viviparous female: Body broadly elongate. Head scabrous, with dense spinules or warts on dorsum and venter. Antennal tubercles well developed, strongly converging, broad and covered with many warts; medial frontal tubercle indistinct. Antennae 6-segmented, shorter than body, antennal segments I-V with distinct warty imbrications, primary rhinaria non-ciliated or ciliated. Ultimate rostral segment wedge-shaped, with 2 or 3 accessory setae. Distal 2/3 of femora and bases of tibiae with warty imbrications, hind tibiae of nymphs without spinules. First tarsal chaetotaxy 3, 3, 2, or 3, 3, 3. Antennal and dorsal body setae short, blunt or acute at apex. Dorsum of body scabrous; pale or with dark bands on abdominal tergites VI-VII. Siphunculi cylindrical, wide at base, narrow at middle and again becoming wide, with oblique or central aperture lacking a flange, with scabrous imbrications. Distance between 6th and 7th spiracles much less than that between 5th and 6th. Cauda tongue-shaped, with blunt apex, shorter than siphunculi, with 4-6 setae. Anal and genital plates broadly circular, genital plate with 6-19 posterior setae and 2 anterior setae.

In alate viviparous female: Dorsum of head smooth or sparsely to densely spinulose, venter smooth. Frontal setae with acute apices. Antennal segments I-V with normal imbrications, segments III-V with small or large round or transverse oval secondary rhinaria. Fore wings with two-forked medial veins, hind wings with 2 oblique veins. Abdominal tergites with brown or blackish brown spino-pleural and marginal patches, spino-pleural patches on tergites III-V usually fused to form a large dorsal patch. Others similar to apterae.

Distribution.

India, Japan, Europe and newly recorded from China (Shaanxi). In Blackman and Eastop (aphidsonworldsplants.info): India ( Jacksonia campanulata ); in regions with temperate oceanic climates throughout the world, including many oceanic islands (e.g. Iceland, Faroes, Azores, Auckland Is., Macquarie Is., South Georgia) ( Jacksonia papillata ).

Host plants.

On various species of Poaceae ( Dactylis , Deschampsia , Festuca , Poa ), but also with species described from Campanula and an unidentified plant belonging to the Leguminosae / Fabaceae . Other recorded hosts are likely to be casual occurrences ( Blackman and Eastop 2006).

Comments.

This genus is related to Myzus Passerini, 1860, but apterae can be distinguished from the latter by the peculiarly shaped siphunculi and the very broad antennal tubercles. The genus is also very similar to Xenosiphonaphis Takahashi, 1961, in having very broad antennal tubercles and flangeless siphunculi, but in Xenosiphonaphis , the inner apex of the antennal tubercles is only slightly converging. The alatae also differ: in Jacksonia , the basal halves of the siphunculi are without spinules, transverse wrinkles or grooves while those of Xenosiphonaphis have transverse wrinkles or grooves on the basal half.