Carl-Axel Gertsson - Academia.edu (original) (raw)

Papers by Carl-Axel Gertsson

FIGURE 5. Adult female of Pulvinaria glacialis Gertsson & Hodgson. Dorsal surface on left and ven... more FIGURE 5. Adult female of Pulvinaria glacialis Gertsson & Hodgson. Dorsal surface on left and ventral surface on right. Where A = dorsal seta; B = dorsal microductule; C = dorsal tubular duct; D = dorsal simple pore; E = preopercular pore; F = anal plates (dorsal view on left, ventral view on right); G = marginal seta; H = antenna; J = preantennal pore; K1, K2 and K3 = ventral tubular ducts; L = tarsus + claw; M = preanal discpore; N = ventral microduct and P = spiracular discpore.

FIGURE 2. Adult female of Chorizococcus multiporus Gertsson & Hodgson. Labels etc as on Fig. 1.

TRIONYMUS ELYMUS Gertsson & Hodgson spec. nov. ( Fig. 4) (Described m... more TRIONYMUS ELYMUS Gertsson & Hodgson spec. nov. ( Fig. 4) (Described mainly from 4 specimens in fair to good condition). Unmounted material. Not known. Mounted material. Elongate oval in outline, 1625–2550 µm long and 675–950 µm wide; anal lobes moderately developed and lightly sclerotised; antennae 8 segmented; legs normally developed; circulus present; with 2 pairs of distinct cerarii; oral rim ducts absent. Dorsum. Membranous, with frequent fine setae, each mainly 8–40 µm long but with some on head up to 70 µm. Trilocular pores frequent and fairly evenly distributed. Simple (discoidal) pores scarce throughout; also with 2 small convex pores dorsad to each scape. Cerarii clearly present on abdominal segments VII and VIII, each with 2 stout spinose setae (stoutest on VIII), length of cerarian setae on VIII 11–18 µm, those on VII 8–11 µm; with 10–13 auxiliary setae, longest about 75 µm. Ostioles membranous, each lip of posterior pair with about 10–12 trilocular pores and no setae; anterior pair with possibly none on anterior lip and about 12 on posterior lip + 1 or 2 setae. Oral rim ducts absent. Oral collar ducts of two sizes; larger ducts (each about 2.5–3 µm wide, 5 µm long, without a thin inner ductule) frequent throughout, but most abundant on segment VII; smaller ducts (each about 1.5 µm wide, 3–4 µm long, with a long thin inner ductule) in transverse lines across abdominal segments III –VII, with about 10–20 per segment. Multilocular discpores 6– 7 µm wide, present as follows: VIII 0–2; VII 6–8; VI 1–7; V 1–4 and IV 0, located almost anywhere on segment. Anal ring 58–67 µm wide, with 6 setae, each about 85–100 µm long. Venter. Membranous, with frequent fine setae, similar in length to those on dorsum, each 11–35 µm long, but some on head up to 70 µm and those around vulva about 50 µm long; suranal setae 48–60 µm long; long anal lobe setae each 135–145 µm long; anal lobe with a small sclerotised bar arising from most anterior seta. Trilocular pores frequent and fairly [...]

PULVINARIA GLACIALIS Gertsson & Hodgson spec. nov ( Fig. 5) (Describe... more PULVINARIA GLACIALIS Gertsson & Hodgson spec. nov ( Fig. 5) (Described from 6 adult females in fair to good condition, 2 split into separate dorsums and venters) Unmounted material: not seen and no details available. Mounted material: quite large, 1.8–3.4 mm long and 1.3–3.3 mm wide, more or less oval but slightly more pointed at anterior end; symmetrical and rather flat. Stigmatic clefts absent; anal cleft about 1 / 5 – 1 / 6 th total body length. Dorsum: derm lightly sclerotised at maturity, with a series of more heavily sclerotised small areas of irregular shape, arranged more or less segmentally, most abundant near margin, becoming less frequent medially. Dorsal setae extremely scarce, possibly even absent on some specimens; when present, rather spinose, very short, only about as long as width of basal socket. Dorsal pores of 3 types: (i) a small microductule with a moderately long inner ductule possibly without a glandular end: throughout, in a small areolation; (ii) a small simple pore, slightly larger than dorsal microductule: possibly present sparsely throughout, and (iii) a small group of preopercular pores anterior to anal plates: each pore closed, roundly oval, probably flat, in a small areolation; few, less than 10. Cribriform plates, dorsal tubercles, and pocketlike tubercles absent. Dorsal tubular ducts small, each with outer ductule about 5–7 µm long, inner ductule 11–13 µm long, with a small glandular end; frequent throughout. Anal plates probably each approximately triangular, 119– 133 µm long and 55–65 µm wide; each with 3 setae, all close to apex and each about 20 µm long, plus a thinner, subapical seta ventrally, perhaps about 12 µm long. Anogenital fold with 2 pairs of setae along anterior margin, each outer seta strong, 50–55 µm long, each inner seta weaker and shorter; lateral margins each with 3 setae; anal ring with six long setae, each about 150–160 µm long. Anal cleft fairly broad, without marginal setae along margins. Margin: marginal setae stou [...]

FIGURE 6. Adult female of Chorizococcus altoarcticus (Richards). Labels etc as on Fig. 1.

FIGURE 4. Adult female of Trionymus elymus Gertsson & Hodgson. Labels etc as on Fig. 1.

FIGURE 1. Adult female of Atrococcus groenlandensis Gertsson & Hodgson. Dorsal surface on left, v... more FIGURE 1. Adult female of Atrococcus groenlandensis Gertsson & Hodgson. Dorsal surface on left, ventral surface on right. On this and all other figures illustrating adult female Pseudococcidae: A = oral rim duct; B1 = larger oral collar ducts; B2 = smaller oral collar duct; C = trilocular pore; D = simple (discoidal) pore; E = small convex pore; F = dorsal multilocular pore; H = claw; K = coxal pores; M = anal lobe; N = apical antennal segment, and P = ventral multilocular discpore.

TRIONYMUS BOCHERI Gertsson & Hodgson spec. nov. ( Fig. 3) (Described ... more TRIONYMUS BOCHERI Gertsson & Hodgson spec. nov. ( Fig. 3) (Described from 1 specimen in good condition but missing all but 1 complete leg and 1 antenna). Unmounted material. Not known. Mounted material. Elongate oval in outline, 3550 µm long and 1575 µm wide; anal lobes rounded and moderately sclerotised; antennae 8 segmented; legs relatively quite short; circulus small and round; with 2 pairs of distinct cerarii; oral rim ducts absent. Dorsum. Membranous; setae rather few and quite short, each mainly 13–25 µm long but with some on head up to 50 µm. Trilocular pores frequent and fairly evenly distributed. Simple (discoidal) pores scarce throughout; also with 1 small convex pore dorsad to each scape. Cerarii clearly present on abdominal segments VII and VIII, each with two stout spinose setae (stoutest on VIII), length of cerarian setae on VIII 16–18 µm, those on VII about 13 µm; with 9 or 10 auxiliary setae, longest about 55–60 µm. Anal lobe distinctly sclerotised, with about 20–22 trilocular pores on each sclerotised area. Ostioles membranous, each lip of posterior pair with 6–8 trilocular pores, no setae; anterior pair with no pores on anterior lips and about 5 on posterior lips, no setae. Oral rim ducts absent. Oral collar ducts of two sizes; larger ducts (each about 4 µm wide, 8 µm long, without a thin inner ductule) frequent throughout; smaller ducts (each about 1.5–2 µm wide, 6–7 µm long, with a long thin inner ductule) very scarce on abdominal segments only. Multilocular discpores each 10 µm wide, present as follows: VIII 2; VII 5 along posterior margin and 2 more medially; VI 1 post., 2 elsewhere; V 4 post. + 4 elsewhere, and IV 2. Anal ring 80 µm wide, with 6 setae, each about 100 µm long. Venter. Membranous, with frequent fine setae, most clearly longer than those on dorsum, each 25–65 µm long, but some on head up to 75 µm; suranal setae 50 µm long; both long anal lobe setae broken off; each anal lobe with a small sclerotisation near base of anterior seta. Triloc [...]

The Swedish fauna of thrips (Thysanoptera) in the family Phlaeothripidae consists of 49 species. ... more The Swedish fauna of thrips (Thysanoptera) in the family Phlaeothripidae consists of 49 species. A key to species found in Sweden is provided. One species is recorded as new for the country, and 10 new regional records are presented. A checklist of all Swedish species with regional distribution is also given.

CHORIZOCOCCUS MULTIPORUS Gertsson & Hodgson spec. nov ( Fig. 2) (Desc... more CHORIZOCOCCUS MULTIPORUS Gertsson & Hodgson spec. nov ( Fig. 2) (Described from 2 good, wellstained specimens plus another in fair condition) Unmounted material: not known. Mounted material. Oval in outline, 1175–1250 µm long and 575–675 µm wide; anal lobes moderately developed; antennae 7 or 8 segmented; legs of normal length; circulus present; with 3 pairs of distinct cerarii; oral rim ducts present. Dorsum. Membranous, with frequent fine setae, each 7–22 µm long; setae absent medially on abdominal segment VIII. Trilocular pores relatively sparse and fairly evenly distributed. Simple (discoidal) pores possibly only present mesad to eyespots; also with 3–5 small convex pores dorsad to each scape. Cerarii clearly present on abdominal segments VI, VII, and VIII, each with two stout spinose setae (stoutest on VIII), length of cerarian setae on VIII 17–22 µm; with 11 or 12 auxiliary setae, longest about 33–40 µm; setae on segment V stouter than normal setae and set further apart than on other cerarii and without associated trilocular pores. Ostioles membranous, each lip with few trilocular pores plus 0 or 1 small setae. Oral rim ducts each 8 µm wide, present as follows (totals across segment): VIII 0; VII 5–13; VI 6–9; V 11–16; IV 10–14; III 6–10; II 5–9; I 6–12; metathorax 4–10; mesothorax 5–14; prothorax 2 or 3; head 1–7. Oral collar ducts absent. Multilocular discpores absent. Anal ring 70–74 µm wide, with six setae, each about 90– 107 µm long. Venter. Membranous, with frequent fine setae, each 10–25 µm long, some obviously longer than those on dorsum, with some on head 40–50 µm long; suranal setae 35–40 µm long; long anal lobe setae each 100–118 µm long. Trilocular pores relatively sparse and fairly evenly distributed. Simple (discoidal) pores not detected. Oral rim ducts present: generally 1 or 2 (occasionally 0) on lateral margins of most segments. Oral collar ducts probably of two sizes, with larger ducts located along the posterior margin of each segment and near lat [...]

ZooKeys

The Swedish fauna of thrips (Thysanoptera) in the family Phlaeothripidae consists of 49 species. ... more The Swedish fauna of thrips (Thysanoptera) in the family Phlaeothripidae consists of 49 species. A key to the species of Phlaeothripidae found in Sweden is provided. One species is recorded as new for the country, and 10 new regional records are presented. A checklist of all Swedish tubuliferan species with regional distributions is also given.

ATROCOCCUS GROENLANDENSIS Gertsson & Hodgson spec. nov ( Fig. 1) (Des... more ATROCOCCUS GROENLANDENSIS Gertsson & Hodgson spec. nov ( Fig. 1) (Described mainly from 3 specimens in good condition) Unmounted material. Not known. Mounted material. Oval in outline, 1025–2600 µm long and 500–1000 µm wide; anal lobes moderately developed; antennae 8 segmented; legs normally developed; circulus absent; with 2 pairs of distinct cerarii plus a third which may be undifferentiated; oral rim ducts present. Dorsum. Membranous, with frequent fine setae, each mainly 10–21 µm long but with some on head up to 27 µm. Trilocular pores quite frequent and fairly evenly distributed. Simple (discoidal) pores scarce throughout; also with 2 small convex pores dorsad to each scape. Cerarii clearly present on abdominal segments VII and VIII, each with two stout spinose setae (stoutest on VIII), length of cerarian setae on VIII 10–18 µm; with 5–6 auxiliary setae, longest about 33–40 µm; cerarian setae on segment VI barely differentiated from other setae, possibly sometimes absent. Ostioles membranous, each lip with 5–8 trilocular pores and 0–2 small setae. Oral rim ducts each 8 µm wide, distributed as follows: VIII 0; VII 4–6; VI 1 or 2; V & IV 2–4; III – I 1–6; meta to prothorax 2–6; head 6–8. Oral collar ducts of two sizes; larger ducts (each about 3 µm wide and 8 µm long) restricted to a small group marginally on abdominal segments II –VIII, each group with 1–5 ducts, most abundant on posterior segments; smaller ducts (each about 1.5 µm wide and 6–7 µm long) in transverse lines across abdominal segments, most abundant on segments IV & V. Multilocular discpores 6–7 µm wide, with 0 to about 12 on abdominal segments I –VII, mainly near margin but with up to about 6 along posterior margins of segments IV –VII. Anal ring 64–70 µm wide, with 6 setae, each about 100–125 µm long. Venter. Membranous, with frequent fine setae, each 20–85 µm long, but some on head up to 110 µm; suranal setae 36–50 µm long; long anal lobe setae each 140–220 µm long. Trilocular pores frequent [...]

This paper presents data on two new species for Sweden, Carulaspis minima and Pulvinaria regalis.... more This paper presents data on two new species for Sweden, Carulaspis minima and Pulvinaria regalis. Although C. minima has never been found in Sweden, records from the US Plant Quarantine testify that specimens of this insect were present on juniper berries imported from Sweden 1956. P. regalis was observed in 2006 and is now spreading in the south province. This paper also presents 30 new province records which are presented with notes on host plants and distribution patterns in the country.

FIGURE 2. Adult female of Chorizococcus multiporus Gertsson & Hodgson. Labels etc as on Fig. 1.

FIGURE 6. Adult female of Chorizococcus altoarcticus (Richards). Labels etc as on Fig. 1.

FIGURE 4. Adult female of Trionymus elymus Gertsson & Hodgson. Labels etc as on Fig. 1.

ZooKeys

The Swedish fauna of thrips (Thysanoptera) in the family Phlaeothripidae consists of 49 species. ... more The Swedish fauna of thrips (Thysanoptera) in the family Phlaeothripidae consists of 49 species. A key to the species of Phlaeothripidae found in Sweden is provided. One species is recorded as new for the country, and 10 new regional records are presented. A checklist of all Swedish tubuliferan species with regional distributions is also given.