Ablabesmyia monilis (Niitsuma, Hiromi 2013)
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Ordo: Diptera
Familia: Chironomidae
Genus: Ablabesmyia
Name
Ablabesmyia monilis Linnaeus – Wikispecies link – Pensoft Profile
- Ablabesmyia monilis Niitsuma, Hiromi, 2013, Zootaxa 3664: 481-485.
Description
Ablabesmyia monilis: Fittkau 1962: 437; Sasa & Kawai 1987: 55. Ablabesmyia (Ablabesmyia) monilis: Roback 1971: 375, 1985: 185. Ablabesmyia yufucomplexa Sasa & Suzuki, 1991: 99. Ablabesmyia tomoteria Sasa, 1993: 58. Ablabesmyia moniliformis: Niitsuma 2005: 1053, fig. 16.6 – 9. [nec Fittkau, 1962]
Materials Examined
Material examined.Holotype of Ablabesmyia yufucomplexa: male (NSMT-I-Dip 4833), labelled, “No. 222: 50 ”, JAPAN: Oita, Yufu, 11.x. 1990. Holotype of Ablabesmyia tomoteria: male (NSMT-I-Dip 4906), labelled, “No. 244: 51 ”, JAPAN: Toyama, Tomosaka, 21.vi. 1992. Non-types. JAPAN: Fukushima, Iwaki, Hisanohama, Ôbisa River, 1 female with pupal and larval exuviae (SUM-IC-T0397), 1.ix. 1989 (adult emerged 16.ix. 1989); Shizuoka, Surugaku, Nagasawa River, 1 male with pupal and larval exuviae (SUM-IC-T0398), 8.x. 1997 (adult emerged 21.x. 1997); Shizuoka, Suruga-ku, Abe River, 2 males (SUM-IC-T0399, T0400), 6.vi. 2004 (adults emerged 19.vi. 2004); Shizuoka, Iwata, Tsurugaike, 2 males with 1 pupal exuviae (SUM-IC-T0401, T0402), and 4 females with 4 pupal and 1 larval exuviae (SUM-IC-T0403–T0406), 8.v. 1999 (adults emerged 17–21.v. 1999); Nagasaki, Iki Island, Ashibe, 1 male (SUM-IC-T0407) and 2 females (SUM-IC-T0408, T0409), 24.vii. 2006.
Description
Description. Male (n = 8). Body length 3.1–4.5, 3.9 (6) mm. Colouration. Thorax yellow with dark brown scutal vittae, anepisternum II, preepisternum and postnotum. Abdominal tergites I–V, IX pale yellow, and tergites VI–VIII more or less darkened anteriorly. Wing (Fig. 1) with dark spots on humeral cross-vein, RM, FCu, and on costal vein and surrounding areas at apices of R 1, R 2, R 3 and R 4 + 5; membrane with many dark spots; dark macula in middle of cell r 4 + 5 above spot in middle of cell m 1 + 2. Leg segments white with dark bands; subbasal and median bands on foretibia located 0.80–0.82 and 0.40–0.43, respectively, from apex of tibia. Head. Temporals 29 –45, 36 (5), multiserial except uniserial postorbitals. AR 1.8–2.1. Clypeus trapezoid, with 33 –50, 41 (6) setae. Lengths of palpomeres 1–5 (μm): 58 –70, 66 (3); 125–145, 135 (3); 175–195, 185 (3); 135–145 (2); 300–333, 316 (3). Pm 4 0.73–0.74 times as long as Pm 3; Pm 5 2.3 times as long as Pm 4. Thorax. Aps 9 –15, 12 (5); Ac 58 –72, 66 (4), biserial between median scutal vittae, diverging posteriorly; Dc 20 –42, 31 (4), uniserial, but anteriorly biserial; H 9 –19, 13 (4); Pa 19 –34, 26 (5); Su 1 (4); Scts 44 –53, 48 (6). Wing. Length 2.1–3.1, 2.7 (6) mm. Squama with 42 –75, 56 (6) setae. VR 0.85–0.87. Legs. Spur on foretibia 55 –68, 63 (6) μm long with 8 –10, 9 (4) lateral teeth. Spurs on mid tibia 65 –78, 74 (6) and 30 –45, 37 (6) μm long, with 7 –10, 8 (3) and 6 –7, 6 (4) lateral teeth, respectively; inner spur 1.7–2.2 times as long as outer spur. Spurs on hind tibia 63 –78, 72 (6) and 30 –43, 35 (6) μm long, with 7–8 (2) and 4–5 (2) lateral teeth, respectively; inner spur 1.8–2.3 times as long as outer spur; hind tibial comb consisting of 5 –7, 6 (6) bristles. All legs with subapical pseudospurs on ta 1–3; claws pointed or weakly bifid apically, each with 2 (6) long and 2 –4, 3 (6) short basoventral spines. Lengths and proportions of leg segments as in Table 1.
fe Male ti ta1ta2ta3ta4ta5LR BR P1 828–1010 909 970–1162 1067 788–1010 909 455–646 572 343–465 412 222–303 271 131–172 156 0.81–0.87 3.4–5.5P2 929–1172 1052 899–1091 1004 768–899 826 444–505 479 333–384 360 212–253 234 131–162 147 0.78–0.85 5.4–6.6P3 859–1040 945 1141–1384 1260 1101–1283 1174 606–697 640 434–505 465 273–333 303 141–182 164 0.90–0.97 6.1–6.8Female P1 687–929 805 758–1071 915 626–869 752 354–525 437 253–384 322 192–263 227 121–162 143 0.81–0.84P2 788–1141 975 778–1131 972 636–869 765 343–495 427 263–364 313 182–242 211 111–152 136 0.75–0.82P3 707–1010 863 919–1374 1150 828–1182 1024 444–667 566 333–495 417 212–313 260 121–172 147 0.84–0.93 Hypopygium (Fig. 2). Tergite IX with 2 –4, 2 (6) lateral setae. Gonocoxite 158–220, 197 (6) μm long; dorsal lobe 40 –43, 41 (6) μm long, with apical fringe of outwardly curving setae; blade sinuate, tapering toward rounded apex, 63 –78, 72 (6) μm long, with pointed basal projection; lateral lobe not evident; lateral filaments well developed (Fig. 3). Gonostylus 145–205, 188 (6) μm long, 0.92–0.98 times as long as gonocoxite, with megaseta expanded apically. Female (n = 7). Body length 1.9–3.1, 2.5 (6) mm. Colouration. Similar to male. Subbasal and median bands on foretibia located 0.76–0.83 and 0.35–0.44, respectively, from apex of tibia. Seminal capsule brown on oral half. Head. Temporals 30 –43, 36. Antenna with terminal flagellomere distinctly longer than preceding 3 flagellomeres together; AR 0.30–0.34. Clypeus with 35 –67, 51 (6) setae. Lengths of palpomeres 1–5 (μm): 55 –65, 59 (5); 103–125, 113 (5); 135–180, 156 (5); 108–140, 119 (5); 255–268, 259 (5). Pm 4 0.71–0.78 times as long as Pm 3; Pm 5 1.9–2.2 times as long as Pm 4. Thorax. Aps 7 –17, 13; Ac 70 –97, 82 (6); Dc 27 –45, 35; H 16 –33, 24; Pa 29 –45, 37; Su 1 –2, 1; Scts 51 –73, 64. Wing. Length 1.9–2.8, 2.3 mm. Squama with 50 –70, 62 setae. VR 0.84–0.90.
Legs. Spur on foretibia 50 –65, 56 μm long with 8 –10, 9 (6) lateral teeth. Spurs on mid tibia 58 –73, 65 and 25 – 43, 34 μm long, with 8 –9, 9 (4) and 4 –7, 6 (4) lateral teeth, respectively; inner spur 1.6–2.4 times as long as outer spur. Spurs on hind tibia 60 –70, 66 and 20 –38, 31 μm long, with 7 (2) and 5 (2) lateral teeth, respectively; inner spur 1.8–3.3 times as long as outer spur; hind tibial comb consisting of 5 –6, 5 bristles. All legs with subapical pseudospurs on ta 1–3; hind leg with 9 –21, 15 sensilla chaetica on basal 0.49–0.66 of ta 1. Lengths and proportions of leg segments as in Table 1. Genitalia (Fig. 4). Gonocoxapodeme VIII well developed. Gonapophysis VIII tongue-shaped. Gonapophysis IX well developed; notum 103–163, 129 μm long, almost twice as long as ramus. Labium without microtrichia. Seminal capsule oval, 68 (1) μm long and 63 (1) μm wide. Segment X reduced, with 0–3, 1 fine seta on each side. Postgenital plate rounded apically. Pupa (n = 7). Body length 4.8–5.7, 5.2 mm. Colouration. Exuviae pale brown, with distinct pigmentation pattern; wing sheath infuscated along margin and veins, without any dark spots; abdominal tergites II–VII each with dark transverse band along posterior margin, and pair of dark medial vertical bands or anteromedial patches (Fig. 5 a, b). Cephalothorax. Thoracic horn (Fig. 6) bulbous, 424–566, 504 μm long and 1.6–1.8 times as long as broadest width; apex of aeropyle tube club-shaped (Fig. 7). Thoracic comb composed of 8 –14, 10 teeth with rounded apices. Abdomen (Fig. 8). Tergal shagreen (Fig. 9) consisting of slightly arched, transverse rows of 2–3 or more spinules. LS 1 -seta on A.VII located 0.40–0.50 from anterior margin, and on A.VIII located 0.34–0.37. Anal lobe 505–566, 540 μm long, 2.3–2.7 times as long as wide, with anterior and posterior anal macrosetae located 0.46– 0.54 and 0.56–0.63, respectively, from anterior margin; outer margin of lobe spinulate. Male genital sac 0.71–0.72 as long as anal lobe.
Fourth instar larva (n = 3). Colouration. Head yellow with dark postoccipital margin; body entirely yellow when live. Head (Fig. 10). Length 960 (1) μm; cephalic index 0.58. Ventral cephalic seta S 10 anterolateral to sensory pore; lines S 9 -VP and S 10 -VP making right or somewhat obtuse angle. Antenna (Fig. 11) 0.56 (1) times as long as head capsule; lengths of segments 1–4 (μm): 408–445, 424; 68–71 (2); 5 (2); 4 (2). AR 4.8–5.6. First antennal segment 14.0– 14.8 times as long as basal width, with ring organ located 0.56–0.60 from base; blade 70 (1) μm long, reaching apex of 2 nd segment; accessory blade 73 (1) μm long. Second antennal segment 13.5–14.3 times as long as basal width; style 8 (1) μm long, reaching middle of 4 th segment; peg sensillum 2 (1) μm long. Mandible (Fig. 12) 150–158, 154 μm long, 0.29–0.32 times as long as antenna; basal tooth large with tip directed apically; accessory tooth distinct. Basal segment of maxillary palp (Fig. 13) subdivided into 1 short (p 3) and 2 long parts (p1, 2), 93–103 (2) μm in total length, and 5.3–5.9 times as long as basal width; p 2 3.0– 3.5 times as long as p 3, and slightly shorter than p 1. Ligula (Fig. 14) 110–113 (2) μm long, 1.9 –2.0 times as long as toothed width, with basal granulose area occupying 0.23–0.24 of total length; toothed margin concave; middle tooth 1.5–1.8 times as long as wide. Paraligula bifid, 48–50 (2) μm long, with fork located 0.47–0.50 from base; outer spine 2.5–3.3 times as long as inner spine. Pecten hypopharyngis with row of 19–20 (2) teeth. Body. Procercus 3.6 times as long as basal width, with 7 apical setae; both lateral setae located 0.34–0.36 and 0.62–0.67, respectively, from base. Posterior parapod with 16 claws including 1 brown and 2 blackish brown claws; smallest claw sharply bent with large basal expansion; large claws finely spinulate along inner and outer margins (Fig. 15).
Discussion
Remarks. I could not find any significant difference between the present species and A. (A.) monilis (Linnaeus) reported from Europe (Roback 1959: 128, Fittkau 1962: 437, Pinder 1978: 30 as adults; Fittkau 1962: 437, Langton 1984: 46 as pupae; and Laville 1971: 188, Rieradevall and Brooks 2001: 92, Vallenduuk & Pillot 2007: 74 as larvae) and North America (Roback 1959: 128, 1971: 375 as adults, Roback 1985: 185 as pupae and larvae; and Epler 2001: 4.22 as larvae). Tokunaga (1937) described Pentaneura monilis based on many adult specimens collected from Kyoto, Wakayama, Tottori and Tokushima, Japan. It appears that his P. monilis series may, in fact, consist of two or possibly three species including A. (A.) monilis, A. (A.) prorasha and A. (A.) jogancornua, judging from his drawing of the wing with three dark spots along the costal margin (Tokunaga 1937, fig. 66). The critical form of the aedeagal complex was not included in his figure 80 of the hypopygium. Twenty-six specimens used in his description still exist in the Kyushu University Museum (Tadauchi and Yamamoto, pers. comm.), although their conditions have considerably deteriorated over the long-term storage in alcohol. Fittkau (1962) erected Ablabesmyia moniliformis as a new species for Tokunaga’s P. monilis. However he had not provided a diagnostic description, nor made reference to one, nor designated a holotype, but yet the proposed name satisfies the provisions of Article 13.1. 2 of the Code and thus is considered as a nomen dubium.
Taxon Treatment
- Niitsuma, Hiromi; 2013: Revision of the Japanese Ablabesmyia (Diptera: Chironomidae: Tanypodinae), with descriptions of three new species, Zootaxa 3664: 481-485. doi
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