Eulachnus pumilae Inouye

Kanturski, Mariusz & Wieczorek, Karina, 2014, Systematic position of Eulachnus cembrae Boerner with description of hitherto unknown sexual morphs of E. pumilae Inouye (Hemiptera, Aphididae, Lachninae), Deutsche Entomologische Zeitschrift 61 (2), pp. 123-132 : 123

Taxon classification Animalia Hemiptera Aphididae

Eulachnus pumilae Inouye Figs 1, 3a, c

Eulachnus pumilae Inouye 1939: 134, by original designation

Description.

Oviparous female (Fig. 1; Table 1, 2). Colour in life unknown. Pigmentation of mounted specimens: several structures pigmented in a generally transparent body. Antennae brown, except segment I, which is pale at base and light-brown at apex. Fore and middle femora yellow with darker ends. Fore and middle tibiae light-brown. Hind legs brown, with only paler apices of femora. Tarsi brown. Siphuncular sclerites brown. Body elongated, oval (Fig. 1a). Head with big compound eyes, without triommatidia. Head width 0.36-0.37 times length of antennae. Head chaetotaxy: dorsal side with 11, ventral side with 12 fine and pointed setae, 0.08-0.11 mm long. Head setae arising from wart-like bases. Antennae (Fig. 1b, c) 6-segmented 0.39-0.40 times length of body. Ant. segm. III (Fig. 1b) shorter than segm. IV+V+VI with smooth proximal part and imbricated apex. Ant. segm. IV (Fig. 1b) only slightly shorter than ant. segm. V. Ant. segm. V (Fig. 1c) slightly longer than ant. segm. VI, with 1 rounded or oval primary rhinarium at apex. Rhinarium with little developed sclerotic rosette. Ant. segm. VI (Fig. 1c) with very short terminal process (VIb), 0.20-0.26 times length of base (VIa) and with 1 rounded or oval primary rhinarium with little sclerotic rosette and 4 accessory rhinaria situated close to each other in about half of length of segment. Ant. segm. IV-VI imbricated on whole length. Other antennal ratios: VI:III 0.57-0.58, V:III 0.63-0.64, IV:III 0.59-0.61 Antennal chaetotaxy: segm. I with 4 setae, segm. II with 5 setae, segm. III with 20-23 setae, segm. IV with 7-9 setae, segm. V with 7-11 setae, segm. VI with 4-5 basal, 5-6 apical and 1 subapical setae. Ant. segm. III-IV with short and slightly forked setae (Fig. 1b), segm. V and VI with short and pointed setae, shorter, or as long as diameter of segments. Longest seta on ant. segm. III 1.00-1.05 times basal articular diameter of this segment (BD III). Rostrum short, reaching behind middle coxae. Apical segment of rostrum (ARS) blunt, with very short apical part (Fig. 1d), 0.21-0.22 times ant. segm. III, 0.37 times ant. segm. VI and 0.42-0.45 times second segment of hind tarsus (HT II), with 6 primary and 2 accessory setae. Dorsal side of thorax covered by short, 0.04-0.05 mm, and blunt setae. Hind legs long, covered by slightly blunt setae, which are as long as or slightly longer than width of tibiae. Distal, inner side of fore and middle tibiae with numerous short and pointed setae. Hind tibiae (Fig. 1e) slightly swollen, with 100-105 irregular pseudosensoria reaching about ¾ length of tibiae. Some setae of hind tibiae with slightly blunt apices (Fig. 1e), longest setae on distal part of tibiae pointed. First segment of hind tarsus (HT I) long, its basal length 0.38-0.43 times dorsal, 0.25-0.28 times ventral and 0.56-0.67 times intersegmental length, with 2 dorsal and 8-10 ventral, pointed setae (Fig. 1f). HT II 0.41-0.47 times length of ant. segm. III and 0.83 times ant. segm. VI. Dorsal side of abdomen membranous without sclerites and scleroites (Fig. 1a). Dorsal setae not numerous, very short, on abd. segm. I-VI 0.01-0.03 mm long and on segm. VII and VIII 0.05-0.08 mm long, pointed. Siphunculi very low, with narrow cone-shaped base. Subgenital fig in form of two sclerites. Cauda broadly rounded with many long, fine and pointed setae and very short spinules.

Description.

Alate male (Figs 1, 3a, c; Table 1, 3). Colour in life unknown. Pigmentation of mounted specimens: several structures pigmented in a transparent body. Antennae dark brown with slightly lighter ant. segm. VI. Fore and middle femora light brown with darker ends. Hind femora dark brown with pale anterior parts. Tibiae and tarsi brown. Wings pale with light brown veins. Abdomen pale with light brown sclerites and scleroites. Siphuncular sclerites brown. Genitalia brown. Body elongated, oval. Head (Fig. 1g) with big and very well-developed compound eyes, without triommatidia and with 3 well-developed ocelli. Head width 0.25-0.26 times length of antennae. Head chaetotaxy: dorsal side with 14, ventral side with 10 long, fine and pointed setae, 0.11-0.13 mm long. Head setae arising from well-developed and brown, oval scleroites. Antennae (Fig. 1h, i) 6-segmented, 0.69-0.70 times length of body. Ant. segm. III (Fig. 1h) shorter than segm. IV+V+VI, with 125-136 secondary rhinaria. Almost all rhinaria small and rounded, situated on whole length and surface of segment. Ant. segm. IV (Fig. 1h) almost as long as ant. segm. V, with 55-64 secondary rhinaria. Ant. segm. V (Fig. 1i) longer than ant. segm. VI, with 1 rounded primary rhinarium at apex with little developed sclerotic rosette and 35-43 secondary rhinaria. Secondary rhinaria on ant. segm. IV and V small and rounded, situated on whole length and surface of segments. Ant. segm. VI (Fig. 1i) with very short VIb, 0.16-0.17 times VIa. VIa with 1 rounded or oval primary rhinarium with little sclerotic rosette, 4-5 accessory rhinaria situated close to each other in about half of length of segment and 11-14 secondary rhinaria, situated under the accessory rhinaria. Other antennal ratios: VI:III 0.38-0.41, V:III 0.57-0.60, IV:III 0.58-0.63. Antennae with pointed setae of various length. Longest seta on ant. segm. III 1.35-1.36 times BD III. Antennal chaetotaxy: segm. I with 4-7 setae, segm. II with 3-5 setae, segm. III with 18-19 setae, segm. IV with 7-9 setae, segm. V with 10-11 setae, segm. VI with 6-7 basal, 5-6 apical and 1 subapical setae. Rostrum short, reaching mesosternum. ARS blunt, with very short apical part (Fig. 1j), 0.14 times ant. segm. III, 0.34-0.37 times ant. segm. VI and 0.43-0.45 times HT II, with 6 primary and 2 accessory setae. Dorsal side of thorax covered by long, fine and pointed setae, 0.09-0.10 mm long. Media with 1 fork. Hind legs long, covered by long and pointed setae, which are longer than width of tibiae. HT I long, its basal length 0.27-0.30 times dorsal, 0.20-0.22 times ventral and 0.61-0.75 times intersegmental length, with 2 dorsal and 12 ventral, pointed setae (Fig. 1k). HT II 0.32 times length of ant. segm. III and 0.70-0.85 times ant segm. VI. Dorsal side of abdomen membranous, with long and pointed setae, on abd. segm. I-V 0.07-0.09 mm long, on segm. VI-VIII 0.09-0.12 mm long. Spinal setae arranged in two pairs on each segment, arising from oval scleroites (Fig. 1l). Siphunculi very low, with narrow cone-shaped base. Abdominal sternite VI and VII sclerotized on whole surface. Cauda broadly rounded with many long, fine and pointed setae and very short spinules. Parameres present, located above basal part of phallus, clearly visible, basally fused. Their lobate parts arise into distinct, finger-like projection toward base of phallus. Parameres dark pigmented, with numerous, long setae on entire surface. Basal part of phallus crescent-shaped, light brown, with numerous long setae. Sclerotized arms clearly visible, strongly sclerotized, dark pigmented. Proximal part robust, ends in triangular apex. Distal part also robust, strongly flattened with thorn-like process located in inner edge of arm. Sclerotized arms form upper half-circle-shaped structure that surrounds genital area (Fig. 3a, c).

Host plants.

Pinus koraiensis ( Inouye 1970; Lee et al. 1994; Pashchenko 1988; Szelegiewicz 1974), Pinus parviflora ( Blackman and Eastop 1994), Pinus pentaphylla ( Inouye 1970), Pinus pumila ( Inouye 1939, 1970; Pashchenko 1988), Pinus strobus ( Lee et al. 1994; Pashchenko 1988).

Distribution.

India ( Ghosh 1982), Japan ( Inouye 1939, 1970), Korea ( Lee et al. 1994; Szelegiewicz 1974), Russia-Far East ( Pashchenko 1988).