Stomaphis longirostris

Lukasz, Depa & Kanturski, Mariusz, 2014, Description of hitherto unknown fundatrices of Stomaphis graffii and S. longirostris (Hemiptera, Aphididae, Lachninae), Deutsche Entomologische Zeitschrift 61 (1), pp. 31-36 : 31

Stomaphis longirostris Fundatrix (Fig. 1Table 1)

Description:

Body large, oval. Head distinctly sclerotised, dark. Antennae pale, with first two segments darker, densely covered with short setae (Fig. 1a). Legs dark, with only middle of tibiae slightly paler. Head covered with numerous short setae. Epicranial suture well developed. Eyes small, with triommatidia not well separated. Antennae 0.13 - 0.34 times body length. Antennal segments IV and VI shorter than V, which is thinner in the middle of its length (Fig. 1b, compare with apterous viviparous female - Fig. 3ab). Antennal ratios: ant. segm. III / segm. IV+V+VI 0.62 - 0.64; segm. III / segm. IV 2.03 - 2.42; segm. IV / segm. V 0.60 - 0.83; segm. V / segm. VI 1.24 - 1.57; segm. VI base / segm. VI terminal process 4.30 - 6.25. Secondary rhinaria of unequal diameter on III and IV antennal segments. Accessory rhinaria on antennal segment VI diffused on the base of segment. Terminal process subequal to the diameter of primary rhinarium, with nodose protuberances at the apex (Fig. 1c). Rostrum longer than body. Labrum covered with 1-5 setae (Fig. 1d). Apical segment of rostrum (ARS) 1.64 - 1.79 times HT II and 2.46 - 2.95 ant. segm. VI terminal process, with numerous accessory setae.

Prothorax dark, with spinal and marginal sclerotizations. Meso- and metathorax with marginal sclerites only. Mesothoracic furca small, well separated. Metathoracic furca reduced, only in form of small, distinctly sclerotised protuberances. Legs covered by long and pointed setae, as long as the diameter of tibia in the middle. HT II 1.26 - 1.36 times second segment of middle tarsus (MT II). Ratio of ant. segm. IV to HT II 0.68 - 0.81.

Abdomen membranous, covered with fine, long setae, with three rows of dark, intersegmental insertions. Spiracles on very small, pigmented sclerites. Siphuncular pores on distinct, sclerotised cones. Anterior part of the cone often extended, broken into smaller scleroites (Fig. 1f, unlike in apterous viviparous female - Fig. 3d). Weak, paired spinal sclerites, often broken into many small scleroites, sometimes absent, on abdominal tergite VII. Abdominal tergite VIII distinctly and uniformly sclerotised, covered with a few rows of long setae in the posterior part of the tergite. Subgenital plate separated into two big sclerites, covered with long setae. Cauda rounded, sclerotised, covered with many long setae (Fig. 1e).

Diagnosis:

From the apterous viviparous female it may be distinguished by (fundatrix vs apterous viviparous female):

lower ratio of ant. segm. IV to ant. segm. V: 0.6 - 0.83 vs 0.67 - 1.03

higher ratio of ant. segm. V to ant. segm. VI: 1.24 - 1.57 vs 0.96 - 1.32

lower ratio of second segment of hind tarsus (HT II) to second segment of middle tarsus (MT II): 1.26 - 1.36 vs 1.36 - 1.43