Hyadaphis anethi Nafría, Hidalgo & Brown, 2016, sp. n.

Hyadaphis anethi sp. n.

Description. Apterous viviparous females (Figures 3, 4 A, 4B), from 24 specimens, which have been measured. Colour when alive unknown. When mounted extensively pale with brown parts (see details below) and ellipsoid-shaped. Metric and meristic features in Table 1. Head dorsally smooth and ventrally very slightly rough, and mostly (including clypeus, labrum and mandibular and maxillar laminae) pale brown. Triommatidium quite well integrated in the eye. Frons convex. Dorsal and ventral cephalic setae similar in length and shape, delicate and pointed; there are no laterofrontal setae. Antennae five- or six-segmented (15 and 9 specimens respectively), pale in general, being the ultimate and the apex of the penultimate segments brownish; antennal segments I and II with scarce and very little marked lines and flagellar segments more or less imbricated. Antennal setae similar to the dorsocephalic setae. Rostrum reaches or slightly exceeds the middle legs coxae and brownish. Ultimate rostral segment short triangular in shape, as brown as the previous one and darker than others, and usually without accessory setae. Apex of tibiae and tarsi brown and darker than other parts of legs; setae on tibiae and femora scarce, delicate and pointed. Sternum of thoracic segments without sclerites.

Segmental edges between pro- and mesothorax and anterior and posterior to abdominal segment 7 well defined; others edges inconspicuous. Thoracic and most of abdominal segments smooth. Postsiphuncular sclerites and abdominal tergite 8 pale and with lines of spicules. Spiracular sclerites pale or very pale. Intersegmental sclerites inconspicuous. Marginal tubercles usually present on prothorax (smaller than others), metathorax and abdominal segments 2–5, wide and flat, wider than the length of nearest seta. Dorsoabdominal setae scarce (8 on each anterior segment), short and blunt or pointed. Ventrum of abdomen smooth, with setae pointed and little longer dorsoabdominal ones. Siphunculi swollen, pale brown; delicately rough, with two distally incomplete lines, and with 1 or 2 striae in the constriction below the well defined flange. Cauda finger-like and paler than siphunculi; lateral caudal setae longer than the dorsal caudal setae.

Alate viviparous females (Figures 4 C, 4D, 4E), from 9 specimens. Metric and meristic features in Table 1. Mostly qualitative features similar to those of apterae, which are omitted as well as those characteristic of a winged aphid. Antennae uniformly brown. Secondary sensoria round or elliptical, slightly protruding, with double margin and disposed around the antennal segments III to V. Marginal abdominal sclerites present, usually carrying marginal tubercles and dark brown in most pigmented specimens. Cauda basally larger and distally slender than those of apterae.

Males (Figures 4 F, 4G, 4H), from 2 specimens. Metric and meristic features in Table 1. Similar in general aspect and qualitative features to alate viviparous females.

Biology. From the collector’s annotations Hyadaphis anethi sp. n. was collected on Anethum sp., but A. graveolens could be the plant host, because it is the only known species of Anethum in Pakistan (Tropicos.org, 2015). The presence of males suggests that the species is holocyclic, but it is not possible to ensure that the species is monoecious on Anethum (and why not on other Umbelliferae) or it is migrating to a possible primary host, species of Lonicera, because they are winged.

Distribution. The type specimens (viviparous females) of H. anethi sp. n. were collected in the slopes of the Lowari Pass near Dir (Khyber Pakhtunkhwa province, Pakistan); 2000 m a.s.l. (from Naumann), approximately 35° 12’ N, 71° 50’ E (from Gladstonefamily.net, 2015a). The males were collected at Kalam (same Pakistani province); 1900 m a.s.l. (from Naumann), approximately 35° 50’ N, 72° 59’ E (from Gladstonefamily.net, 2015b). Based on the host plant and on the geographic data (both localities are 90–92 km apart), the new species may be present in other places of high altitude around the Indus river basin. As A. graveolens is widely distributed in Europe and Palaearctic Asia and is cultivated around the World, the distribution of the aphid could be wider.

Types. Holotype: viviparous apterous female, PAKISTAN: Lowari Val (Dir), 2000 m a.s.l., 18.VIII.2001, on Anethum; Naumann leg. [67A]; collection of the Muséum national d’Histoire naturelle (Paris, France), sample 0 14114, six-segmented antennae specimen labelled ‘k’ (on the same slide as specimen ‘l’). Paratypes: 23 apterous viviparous females and 9 alate viviparous females, same sample as that of the holotype; collections of the Muséum national d’Histoire naturelle (Paris, France) and the Natural History Museum (London, United Kingdom).

Other studied material. Two males, winged, PAKISTAN: Kalam, 1900 m a.s.l., 25.VIII.1988, vagrants; collection of the Muséum national d’Histoire naturelle (Paris, France).

Etymology. The specific epithet of the new species, anethi, is the plant host genus name in genitive.