Eulachnus cembrae Boerner

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 : 123-126

Taxon classification Animalia Hemiptera Aphididae

Eulachnus cembrae Boerner Figs 2, 3b, d

Eulachnus cembrae Börner 1950: 2, by original designation

Redescription.

Oviparous female (Fig. 2; Table 1, 2). Colour in life unknown. Pigmentation of mounted specimens: head, thorax and abdomen pale or yellowish. Antennae light-brown, except ant. segm. I, which is pale at base and light-brown at apex or antennae uniformly yellowish-brown. Fore and middle femora yellow with darker ends. Hind femora yellow or light brown with paler anterior part. Fore and middle tibiae yellow or light-brown. Hind tibiae brown. Tarsi brown. Siphuncular sclerite brown. Body elongated, oval (Fig. 2a). Head with big compound eyes, without triommatidia. Head width 0.29-0.40 times length of antennae. Head chaetotaxy: dorsal side with 9-10, ventral side with 12 blunt setae, 0.012-0.095 mm long. Head setae arising from wart-like bases. Antennae 6-segmented (Fig. 2b, c) 0.49-0.57 times length of body. Ant. segm. III (Fig. 2b) shorter than segm. IV+V+VI with smooth proximal part and imbricated apex. Ant. segm. IV (Fig. 2b) shorter than ant. segm. V. Ant. segm. V (Fig. 2c) longer than ant. segm. VI, with 1 rounded or oval primary rhinarium at apex with well-developed sclerotic rosette with smooth edge. Ant. segm. VI (Fig. 2c) with very short VIb, 0.16-0.22 times VIa. VIa with 1 rounded or oval primary rhinarium with little sclerotic rosette and 5-6 accessory rhinaria situated close to each other in about ¾ of length of segment. One of them much bigger, with very well-developed sclerotic rosette surrounded by 1 medium sized and 2-3 small other ones. Ant. segm. IV-VI imbricated on whole length. Other antennal ratios: VI:III 0.51-0.57, V:III 0.59-0.66, IV:III 0.38-0.53. Antennal chaetotaxy: segm. I with 4-6 setae, segm. II with 4-5 setae, segm. III with 17-23 setae, segm. IV with 6-9 setae, segm. V with 8-11 setae, segm. VI with 6-7 basal, 6 apical and without subapical setae. Ant. segm. III-IV with short, blunt or spatulate setae (Fig. 2b). Ant. segm. VI with short and pointed setae. Setae shorter than diameter of segments, longest seta on ant. segm. III 0.56-0.66 times BD III. Rostrum short, reaching behind hind coxae. ARS blunt, with very short apical part (Fig. 2d), 0.18-0.20 times ant. segm. III, 0.33-0.37 times ant. segm. VI and 0.35-0.41 times HT II, with 6 primary and without accessory setae. Dorsal side of thorax covered by short, 0.007-0.02 mm long blunt setae. Some setae on meso- and metanotum may arise from scleroites. Hind legs long, covered by slightly blunt setae, which are as long as or slightly longer than width of tibiae. Hind tibiae (Fig. 2e) slightly swollen, with 32-58 irregular pseudosensoria which are reaching mostly to half of length of tibiae. Basal length of HT I 0.30-0.33 times dorsal length, 0.23-0.24 times ventral length and 0.70-0.92 times intersegmental length, with 2 dorsal and 12 ventral, pointed setae (Fig. 2f). HT II 0.48-0.55 times length of ant. segm. III and 0.90-1.00 ant. segm. VI. Dorsal side of abdomen membranous. Abd. segm. I-VI without sclerites and scleroites (Fig. 2a). Abd. segm. I-VI with few, very short slightly blunt dorsal setae, 0.015-0.025 mm long. Abd. segm. VII and VIII with slightly longer and pointed dorsal setae, 0.035-0.062 mm. Setae on abd. segm. VII and VIII arising from oval scleroites. Siphunculi very low with a narrow cone-shaped base. Subgenital fig in the middle subdivided. Cauda broadly rounded with numerous long, fine and pointed setae and very short spinules.

Redescription.

Alate male (Figs 2, 3b, d; Table 1, 3). Colour in life unknown. Pigmentation of mounted specimens: head and thorax sclerotized, yellow or brown. Antennae light brown with ant. segm. I, II and proximal part of segm. III pale. Legs yellow to light brown with darker apices of femora and sometimes darker tibiae. Tarsi dark. Wings pale with light brown veins and brownish pterostigma. Abdomen pale with light brown sclerites and scleroites. Siphuncular sclerites and genitalia brown. Body elongated, oval. Head (Fig. 2g) with big and very well-de veloped compound eyes, without triommatidia and with 3 well-developed ocelli. Head width 0.23-0.24 times length of antennae. Head chaetotaxy: dorsal side with 11, ventral side with 10 blunt setae, 0.045-0.075 mm long. Head setae arising from well-developed and light brown, oval scleroites. Antennae (Fig. 2h, i) 6-segmented, 0.78-0.81 times length of body. Ant. segm. III (Fig. 2h) shorter than segm. IV+V+VI, with 80-120 secondary rhinaria. Ant. segm. IV (Fig. 2h) shorter than ant. segm. V, with 29-42 secondary rhinaria. Ant. segm. V (Fig. 2i) longer than ant. segm. VI, with 1 rounded primary rhinarium at apex, with little developed sclerotic rosette and 23-38 secondary rhinaria. All secondary rhinaria on ant. segm. III-V small and rounded, situated on whole length and surface of segment. Ant. segm. VI (Fig. 2i) with short VIb, 0.19-0.24 times VIa, with 1 rounded or oval primary rhinarium with little sclerotic rosette, 4-5 accessory rhinaria situated close to each other in about ⅔ of length of segment and 4-10 small and rounded secondary rhinaria, situated behind VIa. Other antennal ratios: VI:III 0.45-0.51, V:III 0.60-0.71, IV:III 0.50-0.62. Antennal chaetotaxy: segm. I with 4-5 setae, segm. II with 5-6 setae, segm. III with 14-17 setae, segm. IV with 6-11 setae, segm. V with 12-15 setae, segm. VI with 6-7 basal, 5-6 apical and without subapical setae. Ant. segm. III-IV with short, blunt or spatulate setae. Ant. segm. VI with short and pointed setae. Longest seta on ant. segm. III 0.62-0.67 times BD III. Rostrum reaching meso- or metasternum. ARS blunt, with very short apical part (Fig. 2j), 0.12-0.14 times ant. segm. III, 0.27-0.29 times ant. segm. VI and 0.32-0.40 times HT II, with 6 primary and without accessory setae. Dorsal side of thorax covered by fine and pointed setae, 0.012-0.025 mm long. Media with 1 fork. Hind legs long, covered by blunt and pointed setae, not longer than width of tibiae. Basal length of HT I 0.26-0.31 times dorsal, 0.21-0.23 times ventral and 0.68-0.80 times intersegmental length, with 2 dorsal and 14 ventral, pointed setae (Fig. 2k). HT II 0.35-0.38 times length of ant. segm. III and 0.72-0.83 ant. segm. VI. Dorsal side of abdomen membranous with pointed setae, on abd. segm. I–VI 0.017-0.025 mm long, on segm. VII– VIII 0.032-0.052 mm long. Spinal setae arranged in two pairs on each segment arising from oval scleroites (Fig. 2l). Siphunculi very low with narrow cone-shaped base. Abd. segm. VI and VII sclerotised on whole surface. Cauda broadly rounded with numerous long, fine and pointed setae and very short spinules. Parameres present, located above basal part of phallus, clearly visible, basally fused. Their lobate parts, capitate in shape, arise into distinct, forceps-like projection toward base of phallus. Parameres dark pigmented, with numerous long setae on entire surface. Basal part of phallus club-shaped, brown, with few short setae in middle part. Sclerotized arms clearly visible, strongly sclerotized, dark pigmented. Proximal part robust and ends in triangular apex, distal part thinner. Sclerotized arms form upper half-circle-shaped structure that surrounds genital area (Fig. 3b, d).

Host plants.

Pinus cembra ( Binazzi 1978, 1984; Börner 1950, 1952; Börner and Franz 1956; Barbagallo and Patti 1994; Chumak 2004; Heinze 1962; Kanturski and Wieczorek 2014; Pašek 1952, 1954; Pintera 1968; Roberti 1993; Szelegiewicz 1962a, 1962b, 1968, 1978; Tashev 1985), Pinus peuce ( Tashev 1985), Pinus strobus ( Chumak 2004).

Distribution.

Austria ( Börner 1950, 1952; Börner and Franz 1956; Heinze 1962; Pintera 1968), Bulgaria ( Tashev 1985), Italy ( Barbagallo and Patti 1994; Binazzi 1978, 1984; Roberti 1993), France (MNHN collection), Poland ( Szelegiewicz 1962a, 1962b, 1968, 1978; Kanturski and Wieczorek 2014), Slovakia ( Pašek 1952, 1954), Switzerland (BMNH collection, MZLU collection), Ukraine ( Chumak 2004).