Lecanium trifasciatum Green, 1922 , 1024 Hemicyclia Paralecanium trifasciatum Revision of the soft scale genus Paralecanium (Hemiptera: Coccomorpha: Coccidae) with the introduction of three new genera and twenty new species Chris J. Hodgson Douglas J. Williams Zootaxa 2018 2018-07-05 4443 1 1 162 (Green) Green [151,554,584,610] Insecta Coccidae Discochiton GBIF Animalia Hemiptera 68 69 Arthropoda species trifasciatum comb. nov.    Lecanium trifasciatum Green, 1922, 1024. Typedata:  SRILANKA: Batticaloa, on Hemicyclea[=  Hemicyclia]. Syntypes, female. Typedepository: BMNH, London, England, U.K.   Paralecanium trifasciatum; Green, 1937, 307. Change of combination.   Material examined. Lectotypef(here designated):    SRI LANKA(as Ceylon): top labels:  TYPEin red in round label + Lectotypeon narrow label; bottom label: Lecanium/ ( Paralecanium) / trifasciatum/ Green / from?Hemicyclea / Batticaloa / CeylonMay 0 6 ( BMNH): 1/1adf (g, a young adult; on envelope: coll. E.E.G.).  Other material. MALAYSIA, Kuala Lumpur, on  Micheliasp., 1.i.1943, R. Takahashi (BMNH): 1/10adff (under two cover slips, all mature and almost all with a clear glassy test covering all of dorsum; f-p; plus 1/1 fairly young adf (fg). Both slides labelled [ Paralecanium trifasciatummicheliae] Takahashi, type,but no evidence found that this was ever described so this is considered to be a manuscript name.  INDONESIA, Java, Buitengor, on  Piper nigrum, no date, A. Zimmermann, #78 (BMNH): 2/4adff (f-g, one specimen missing venter; labelled [ Paralecaniumzimmermanni] Green; this is clearly a manuscript name).  Note. The main description is based on the very young lectotypespecimen; details for mature specimens from Malaysiaand Javagiven in [...] brackets where different.  Unmounted material.“Adult female flat, broadly rounded, subround, the margin indented on the frontal and stigmatic areas. Colour pale translucent green, with three broad, reddish brown transverse bands across the dorsum.” ( Green, 1922: 1024).  Slide-mounted adult female.Body small and almost round. Length 2.0 [4–5] mm, width 1.9 [3–5.0] mm.   Dorsum.Derm of young specimen unsclerotised [older specimens with derm partially to completely sclerotised; older Malaysian specimens with a less sclerotised border along margin; submarginally with elongate areolations ( Java) or small pale spots (Malaysian), both lots of specimens with areolations becoming rounder, sparser and less clear submedially and medially; also with a band of more elongate areolations around anal plates; rest of derm apparently without minute pale spots]. Marginal radial lines obscure but positions indicated by distribution of pores and setae; with 13 radial lines of setae on head between anterior stigmatic clefts, each side with 4 or 5 between stigmatic clefts and 12 or 13 along abdominal margin; stigmatic rays present (but not visible on unsclerotised lectotypespecimen). Abdominal clear areas not apparent (perhaps due to membranous derm of young individual) [present]. Dorsal setae each stoutly setose, narrowing to a blunt apex but sometimes appearing more pointed [almost capitate ( Malaysia)], about 8–10 µm long with basal socket about 4–5 µm wide; frequent in a sparse polygonal pattern, pattern becoming less clear medially where setae sparser. Preopercular pores each unevenly round to oval, with a granular surface, unusually large, each 5–8 µm wide; distributed as follows: CA1 with 0, CA2 with 3 or 4 [0 or 1], CA3 with 24–29 [0–22] and CA4 each with 21 or 22 [15–24] pores. Small simple pores, each about 1 µm wide, infrequent, probably situated mainly within lines of setae. Larger dorsal pores not detected [probably present as oval pale areas with a pore medially]. Anal plates elongate, together narrowly quadrate, with posterior margins slightly longer than anterior margins; each plate with 3 or 4 small setae near apex plus 1 or 2 minute pores medially; length of plates 200 [210–230] µm, combined width 145 [155185] µm. Anogenital fold with 4 [2–4] minute setae at each corner of anterior margin, each lateral margin with 1 seta anteriorly.   FIGURE 26.  Discochiton trifasciatum(Green), adult female. Type series, Batticoloa, Ceylon, on?  Hemicycliasp.   FIGURE 27.  Discochiton trifasciatum(Green), adult female. Kuala Lumpur, Malaya, on  Micheliasp.   FIGURE 28.  Discochiton trifasciatum(Green), adult female. Buitenzorg, Java, on  Piper nigrum.  Margin.Marginal ornamentation: groups of radial finger-like ridges [broader, with 3 or 4 corrugations with fine radial lines between marginal setae]. Marginal setae roundly to broadly fan-shaped; width of each fan about 25–40 [40–45] µm, length 30–35 [40–45] µm; with 100 [104–115] setae anteriorly on head between anterior stigmatic clefts; each side with 44–54 [49–68] between stigmatic clefts and 92–99 [103–120] on abdomen. Stigmatic clefts quite deep, each with a narrow entrance, a sclerotised inner margin and 3 elongate, blunt stigmatic spines; median spines longest, 38–40 [36–50] µm long, laterals 25–30 [21–33] µm. Eyespots obscure [distinct; greatest width of each socket about 60 µm, width of each lens perhaps 20 µm].  Venter.Derm membranous without a submarginal border or dermal fold. Multilocular disc-pores frequent on either side of genital opening and on preceding segment only, each side with 7 [5–9] on abdominal segment VII and 8–10 [9–14] on segment VI. Spiracular disc-pores present in a band 1 [1 or 2] pore wide between margin and each spiracle, with 27–38 [18–37] pores in each anterior band and 22–24 [17–36] in each posterior band (the latter band sometimes without pores in middle part of band). Ventral microducts minute, present in a group just posterior to and on either side of labium, sparse elsewhere, particularly submarginally. Ventral setae: with 1 [1 or 2] pairs of setae between antennae; a long pregenital seta on segment VII (about 50 µm long) [85–115 µm], and shorter pairs in segments VI and V; all abdominal segments with rows of minute setae; small setae also abundant submarginally on either side of anal cleft and more anteriorly, often mirroring lines of setae on dorsum. Antennae reduced, each with 3 segments (segmental divisions between segments III–VI absent or obscure); total length 165–180 [170–215] µm. Clypeolabral shield 106–110 [100–110] µm long. Spiracles: width of each peritreme 36–40 [33–55] µm. Legs well developed; metathoracic leg segment lengths (µm): coxa 105 [100–125]; trochanter + femur 145–150 [140– 170]; tibia 70–75; tarsus 95–105 [tibia + tarsus generally more or less fused and sometimes slightly distorted, 185– 225]; claw 12 [10–12]; metathoracic leg setal distribution: coxa 6 [5 or 6], trochanter 1; femur 1, tibia 0, tarsus 3; tarsal digitules subequal in length to claw digitules, with small capitate apices; claw digitules both broad and subequal [1 narrower than other]; claw probably without a denticle.   Comments.The lectotypespecimen is a very young adult (dorsum membranous) whilst those from Javaand, more particularly from Malaysiaare mature, well sclerotised and very much larger. No significant differences could be detected between these lots of material. Based on these specimens, the diagnostic characters of the adult female of  D. trifasciatumare: (i) legs present and well developed, tibia + tarsus particularly long and sometimes fused; (ii) dorsal setae each stoutly setose, tapering to a blunt apex; (iii) dorsal setae distributed in a reasonably clear polygonal pattern and generally extending medially; (iv) preopercular pores each quite large, with a granulate surface; (v) preopercular pores only associated with CA2–CA4, CA1 without pores; (vi) tibia without setae; (vii) antennae reduced to probably 3 segments (segmentation obscure), and (viii) multilocular disc-pores few and only present on abdominal segments VI and VII. Only two species of  Discochitonhave fully-developed legs,  D. trifasciatumand  D. luzonicum. These two species are very similar but the latter species has preopercular pores associated with CA4 only.  Host-plants.? Hemicycleasp. ( Euphorbiaceae);  Micheliasp. ( Magnoliaceae);  Piper nigrum(Piperaceae). Unconfirmed plant host:  Drypetes sumatrana( Euphorbiaceae)). 1872522431 Malaysia Java 68 69 1 Java lectotype