Hyperomyzus (Neonasonovia) nabali

Hyperomyzus (Neonasonovia) nabali (Oestlund, 1886)

Rhopalosiphum nabali was described by Oestlund (1886: 34) and subsequently transferred to Amphorophora Buckton, 1876 by Oestlund (1923: 143). It was later transferred to Neonasonovia when this taxon had genus rank, by Hille Ris Lambers (1974: 132), and finally to Hyperomyzus (in the subgenus Neonasonovia) by Eastop & Hille Ris Lambers (1976: 121). Viviparous females have been formally described; they have ornamented siphunculi. The species is host-alternating between Ribes, as primary host, and Prenanthes. It is known in Manitoba, New Brunswick, Newfoundland and Quebec (Canada), and in the District of Columbia, Illinois, Kansas, Massachusetts, Minnesota, Missouri, New York, North Carolina, Ohio, Pennsylvania and Utah (United States).

Studied specimens. Canada: New Brunswick, Fredericton, on Prenanthes alba, 3-IX-1956, Hille Ris Lambers & MacGillivray leg. and 6-VII-1960, MacGillivray & Anderson leg., respectively 6 apt and 3 apt; Quebec, Laurentide Park, on Ribes glandulosum, 28-VIII-1956, Hille Ris Lambers leg., 4 al (gynoparae) & 4 ov; all specimens: Hille Ris Lambers det. and Natural History Museum collection.

Apterous viviparous females, virginogeniae or exules (Figures 1 A, 1B), complementary data. The dorsal sclerotization and pigmentation is diverse: in six studied specimens the dorsum is completely pale, as previously described, with very faint rough cuticle around the base of setae and markedly rough sclerotized areas in abdominal segments 6 to 8. In the other three studied specimens there are relatively extensive, rough and pigmented setiferous sclerites in abdominal segments 2 to 8, which sometimes merge to form transverse bands. Antennae from yellowish-brown (in specimens without setiferous sclerites) to brown (in specimens with these sclerites), with darker segment VI and small distal portions of the other segments of antennal flagellum. Legs mostly yellowbrown to brown, tarsi and the apex of tibiae as dark as antennal segment VI. Siphunculi strongly swollen, becoming darker at apex, and bearing dispersed spinules or scales. Quantitative characteristics in table 1.

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Alate viviparous females (gynoparae) (Figure 1 C), complementary data. Antennae and most of legs brown to dark brown; antennal segments I and II, coxae, trochanters and proximal part of femora dusky and progressively darker; siphuncular peduncle weakly pigmented and swollen part brown; cauda almost as dark as most pigmented part of siphunculi. Secondary sensoria more numerous than stated by Blackman & Eastop (2016). Abdomen bearing marginal sclerites light-brown to brown in addition to unpigmented or very pale setiferous and pleural sclerites. Siphunculi similar to those of apterae. Quantitative characteristics in table 1.

Oviparous females (Figures 1 D, 1E), description from 4 specimens. Similar to apterous viviparous females, with antennal segment I somewhat more pigmented and cauda much shorter and blunter at apex. Proximal part of hind tibiae (40% of total length) strongly inflated, as dark as distal parts of femora, and densely covered with 130– 190 scent plates. Genital plate, as usual, bipigmented and with abundance of setae, 12–14 anterior and discal, and 25–26 marginal-posterior. Other quantitative characteristics in table 1.

Comments. The heteroecious holocycle of the species was suspected by Blackman & Eastop (2016), it has been confirmed with the description of oviparous females.