Ablabesmyia jogancornua (Niitsuma, Hiromi 2013)
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Ordo: Diptera
Familia: Chironomidae
Genus: Ablabesmyia
Name
Ablabesmyia jogancornua Sasa et Okazawa – Wikispecies link – Pensoft Profile
- Ablabesmyia jogancornua Niitsuma, Hiromi, 2013, Zootaxa 3664: 492-496.
Description
Ablabesmyia monilis: Sasa & Okazawa 1992: 208partim; Sasa et al.1998: 126partim. [nec Linnaeus, 1758] Ablabesmyia longistyla: Sasa et al.1998: 125partim; Kobayashi & Kubota 2002: 324partim. [nec Fittkau, 1962]
Materials Examined
Material examined.Holotype of Ablabesmyia jogancornua: male (NSMT-I-Dip 4827), labelled, “No. 271: 100 ”, JAPAN: Toyama, Wada River, 9.viii. 1990 (adult emerged 15.viii. 1990). Non-types. JAPAN: Toyama, Toga, Toga River, 1 male (NSMT), labelled, “ Ablabesmyia monilis No. 188: 2 ”, 11.ix. 1990; Kochi, Nakamura, 1 male (NSMT), labelled, “ Ablabesmyia longistyla No. 360: 24 ”, 26.iv. 1998; Kochi, Hiromi, 1 male (NSMT), labelled, “ Ablabesmyia monilis No. 359: 28 ”, 27.iv. 1998; Fukushima, Hirono, Asami River, 1 male with pupal exuviae (SUM-IC-T0451), 1.i. 2003 (adult emerged 18.i. 2003); as previous except 1 male with pupal exuviae (SUM-IC- T0452), 4.v. 2005 (adult emerged 9.v. 2005); as previous except 2 males with 2 pupal exuviae (SUM-IC-T0453, T0454), 5.v. 2005 (adult emerged 19 and 21.v. 2005); as previous except 1 male with pupal exuviae (SUM-IC- T0455), 15.viii. 2009 (adult emerged 27.viii. 2009); Fukushima, Iwaki, Yaguki, 3 males with 3 pupal exuviae (SUM-IC-T0456–T0458), and 1 female with pupal exuviae (SUM-IC-T0459), 15.viii. 2009 (adults emerged 25– 30.viii. 2009); as previous except 3 males with 2 pupal exuviae (SUM-IC-T0460–T0462), and 2 females with 2 pupal exuviae (SUM-IC-T0463, T0464), 15.viii. 2010 (adults emerged 8–10.viii. 2010); as previous except 1 male with pupal exuviae (SUM-IC-T0465), and 1 female with pupal exuviae (SUM-IC-T0466), 15.viii. 2011 (adults emerged 19 and 28.viii. 2011); Kanagawa, Kiyokawa, Miyagase, 1 male with pupal exuviae (SUM-IC-T0467), 2 female with 2 pupal and 1 larval exuviae (SUM-IC-T0468, T0469), and 1 pupa with larval exuviae (SUM-IC- T0470), 14.vi. 1998 (adults emerged 20.vi.– 3.vii. 1998); as previous except 1 male with pupal exuviae (SUM-IC- T0471), 18.x. 1998 (adult emerged 22.x. 1998); as previous except 1 male with pupal exuviae (SUM-IC-T0472), 13.vi. 1999 (adult emerged 25.vi. 1999); Shizuoka, Fujinomiya, Shibakawa, Inase River, 1 male with pupal exuviae (SUM-IC-T0473), 15.vii. 1991 (adult emerged 20.vii. 1991); Shizuoka, Shimizu-ku, Yanbara, 1 male with pupal exuviae (SUM-IC-T0474), 21.vii. 1999 (adult emerged 27.vii. 1999); Shizuoka, Aoi-ku,. Yokosawa, Abe River, 1 female with pupal and larval exuviae (SUM-IC-T0475), 29.viii. 1999 (adult emerged 5.ix. 1999).
Description
Description. Male (n = 21). Body length 2.6–3.7, 3.2 (17) mm. Colouration. Thorax yellow with brown scutal vittae, anepisternum II, preepisternum and postnotum. Abdomen pale yellow, occasionally tergites VI–VIII darkened anteriorly. Wing (Fig. 39) darkened 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. Subbasal and median bands on foretibia located 0.76–0.82 and 0.36–0.43, respectively, from apex of tibia. Head. Temporals 24 –36, 31 (15), multiserial except uniserial postorbitals. AR 1.5–1.9. Clypeus trapezoid with 36 –48, 42 (14) setae. Lengths of palpomeres 1–5 (μm): 40 –63, 50, (12); 83 –108, 98 (12); 130–160, 146 (12); 100– 130, 114 (12); 225–320, 261 (12). Pm 4 0.71–0.83 times as long as Pm 3; Pm 5 2.2–2.6 times as long as Pm 4. Thorax. Aps 7 –16, 11 (17); Ac 51 –78, 62 (13), biserial between median scutal vittae, diverging posteriorly; Dc 19 –29, 24 (17), uniserial, but biserial anteriorly; H 10 –20, 13 (17); Pa 17 –28, 22 (17); Su 1 –2, 1 (16); Scts 29 –55, 41 (16). Wing. Length 1.7–2.6, 2.1 (16) mm. Squama with 30 –51, 42 (14) setae. VR 0.86–0.91. Legs. Spur on foretibia 43 –58, 49 (17) μm long with 6 –8, 7 (15) lateral teeth. Spurs on mid tibia 53 –68, 60 (17) and 28 –40, 33 (17) μm long, with 6 –8, 7 (8) and 4 –6, 5 (12) lateral teeth, respectively; inner spur 1.7–2.1 times as long as outer spur. Spurs on hind tibia 55 –73, 63 (17) and 25 –38, 30 (17) μm long, with 5 –6, 6 (8) and 2 –4, 3 (11) lateral teeth, respectively; inner spur 1.7–2.4 times as long as outer spur; hind tibial comb consisting of 5 –7, 6 (15) bristles. All legs with subapical pseudospurs on ta 1–3; claws pointed or weakly bifid apically, each with 2 (17) long and 2 –4, 3 (17) short basoventral spines. Lengths and proportions of leg segments as in Table 4.
Male fe ti ta1ta2ta3ta4ta5LR BR P1 626–889 763 687–1010 875 545–788 687 (15)323–515 436 (15)242–364 314 (15)162–242 209 (15)91–141 122 (15)0.76–0.81 3.0–4.0P2 717–1030 869 636–990 822 515–717 617 273–414 355 222–313 266 152–212 184 101–131 116 0.72–0.81 4.7–6.9P3 646–909 775 788–1192 991 646–960 816 (15)354–556 462 (15)273–414 349 (15)182–263 227 (15)101–141 123 (15)0.78–0.85 5.5–6.9Female P1 636–788 682 717–899 778 556–687 613 313–414 359 242–313 264 162–212 185 101–121 111 0.76–0.82P2 727–919 807 687–879 760 545–636 581 283–364 315 202–263 231 141–182 162 91–111 104 0.72–0.79P3 667–818 716 828–1020 890 657–778 711 364–455 397 283–354 307 172–232 199 101–121 114 0.76–0.84
Hypopygium. Tergite IX with 0–5, 2 (17) lateral setae. Gonocoxite 143–190, 163 (17) μm long; dorsal lobe 33 – 43, 37 (17) μm long, with apical setal fringe; blade 48 –58, 53 (17) μm long, slightly curved, with apex pointed; lateral lobe 53 –65, 57 (17) μm long, elongate and dentate along inner margin; lateral filaments not evident (Fig. 40). Gonostylus 133–178, 151 (17) μm long, 0.89–0.99 times as long as gonocoxite, with megaseta expanded apically.
Female (n = 7). Body length 1.9–2.2, 2.0 (5) mm.
Colouration. Similar to male. Subbasal and median bands on foretibia located 0.78–0.80 and 0.38–0.43, respectively, from apex of tibia. Seminal capsule brown on oral 1 / 2 – 2 / 3.
Head. Temporals 25 –34, 30. Antenna with terminal flagellomere almost as long as or somewhat longer than preceding 3 flagellomeres together; AR 0.31–0.34. Clypeus with 45 –62, 53 setae. Lengths of palpomeres 1–5 (μm): 45 –60, 51 (6); 88 –105, 98 (6); 135–163, 144 (6); 105–133, 117 (6); 220–295, 256 (6). Pm 4 0.75–0.85 times as long as Pm 3; Pm 5 2.1–2.4 times as long as Pm 4.
Thorax. Aps 8 –18, 12; Ac 50 –70, 61; Dc 19 –33, 23; H 14 –29, 20; Pa 22 –36, 29; Su 1 (6); Scts 33 –54, 44.
Wing. Length 1.7 –2.0, 1.8 mm. Squama with 25 –42, 37 (5) setae. VR 0.85–0.91.
Legs. Spur on foretibia 40 –48, 44 μm long with 6 –7, 6 (6) lateral teeth. Spurs on mid tibia 53 –60, 56 and 30 – 38, 34 μm long, with 7–8 (2) and 4 –6, 5 (6) lateral teeth, respectively; inner spur 1.6–1.8 times as long as outer spur. Spurs on hind tibia 55 –65, 60 (6) and 25 –35, 31 (6) μm long, with 6 –7, 7 (4) and 2 –3, 3 (4) lateral teeth, respectively; inner spur 1.8–2.2 times as long as outer spur; hind tibial comb consisting of 6 –7, 6 bristles. All legs with subapical pseudospurs on ta 1–3; hind leg with 3 –6, 4 sensilla chaetica on basal 0.40–0.53 of ta 1. Lengths and proportions of leg segments as in Table 4.
Genitalia (Fig. 41). Gonapophysis IX well developed; notum 100–128, 116 (4) μm long, and almost twice as long as ramus. Seminal capsule oval, 45 –58, 52 (6) μm long and 40 –50, 47 (6) μm wide. Segment X with 0–3, 2 (4) fine setae.
Pupa (n = 24). Body length 3.6–4.8, 4.1 (23) mm.
Colouration. Exuviae pale brown with distinct pigmentation pattern. Wing sheath broadly infuscated along margin and veins. Abdominal tergites II–VII each with pair of dark patches anteromedially, longitudinal dark bands along rows of lateral muscle marks, and transverse dark band along posterior margin; occasionally tergites more extensively darkened (Fig. 42 a, b).
Cephalothorax. Thoracic horn 310–435, 371 (22) μm long and 1.8–2.2 times as long as broadest width; apex of aeropyle tube club-shaped (Fig. 43). Thoracic comb composed of 9 –16, 11 (23) teeth with round apices.
Abdomen (Fig. 44). Tergal shagreen (Fig. 45) consisting of slightly arched, transverse rows of several spinules. LS 1 -seta on A.VII located 0.45–0.51 from anterior margin, and on A.VIII located 0.27–0.38. Anal lobe 345–460, 383 (23) μm long and 2.2–2.6 times as long as wide; anterior and posterior anal macrosetae located 0.48–0.57 and 0.58–0.64, respectively, from anterior margin; male genital sac 0.78–0.83 as long as anal lobe.
Fourth instar larva (n = 3).
Colouration. Head yellow with dark postoccipital margin; body entirely yellow when live.
Head. Lines S 9 -VP and S 10 -VP making obtuse angle (Fig. 46). Lengths of antennal segments 1–4 (μm): 313– 340, 329; 73–75 (2); 5 (2); 4 (2). AR 3.6–3.8. First antennal segment 13.4–13.9 times as long as basal width, with ring organ located 0.60–0.63 from base; blade 78 (2) μm long, reaching middle of 3 rd segment; accessory blade 75 (2) μm long. Second antennal segment (Fig. 47) 14.5 –15.0 times as long as basal width; style 8 (1) μm long, reaching middle of 4 th segment; peg sensillum 3 (2) μm long. Mandible (Fig. 48) 143–145, 144 μm long, 0.34– 0.37 times as long as antenna, with basal tooth directed apically and with distinct accessory tooth. Basal segment of maxillary palp (Fig. 49) subdivided into 1 long (p 1) and 3 short parts (p 2–4), 73 –85, 78 μm in total length, and 5.7 – 6.0 times as long as basal width; p 2 0.4 times as long as p 1, and 1.7 –2.0 times as long as P 3. Ligula (Fig. 50) 100– 103, 101 μm long, 1.8 –2.0 times as long as toothed width, with basal granulose area occupying 0.23–0.25 of total length. Paraligula bifid and 50 μm long; fork located 0.45–0.55 from base; outer spine 2.8–3.6 times as long as inner spine. Pecten hypopharyngis with 17 –21, 19 teeth.
Body. Procercus 3.2–3.3 times as long as basal width; both lateral setae located 0.35–0.36 and 0.65–0.69, respectively, from base. Posterior parapod with 13 pale and 3 brown claws; smallest claw evenly curved, and large claws finely pectinate along inner and outer margins (Fig. 51).
Discussion
Remarks. Sasa & Okazawa (1991) described Ablabesmyia jogancornua, based only on a single male specimen, and noted (p. 65), “Gonocoxite with 3 pairs of basal lobes, the dorsal lobe brush-like and short; the middle lobe 1.5 times as long as the ventral lobe, horn-like and simple (left) or with apical brush (right); the ventral lobe also horn-like, twice as long as the dorsal lobe, and with apical brush.” Reexamination of the holotype has revealed that the dorsal, the middle and the ventral lobes are interpreted as the dorsal lobe, the aedeagal blade and the lateral lobe, respectively, as defined by Roback (1971), and that the aedeagal blades have no brush apically, and that the lateral lobe is elongate with weak serrations along the inner margin. This species most resembles the species illustrated by Kobayashi & Kubota (2002, fig. 13) under the name of A. (A.) longistyla, in the features of the aedeagal complex, especially the evident lateral lobe. However, real A. (A.) longistyla differs from A. jogancornua in the straight aedeagal blade and the inconspicuous lateral lobe (see Fittkau 1962, fig. 396; Pinder 1978, fig. 81 A; Cranston & Judd 1989, figs 6, 7). Kobayashi & Kubota (l. c.) might have a poor understanding of the structure of the aedeagal complex. Thus the species is valid as a member of Ablabesmyia s. str. Ablabesmyia (A.) jogancornua shares several features with members of the A. (A.) simpsoni species group. The adult aedeagal complex has a fringed dorsal lobe and a more or less distinct lateral lobe, and in the larval posterior parapod the small claw is not curved sharply (Roback 1985). The species, however, do not belong to the A. (A.) simpsoni species group, because of the larval maxillary palp with a basal segment subdivided into four parts. The adult male of A. (A.) jogancornua is similar to that of the North American species A. (A.) janta (Roback) in the aedeagal blade curved and pointed apically and the dentate lateral lobe. However these species are separable from one another. In A. (A.) jogancornua the lateral lobe has a dentate inner margin, whereas, in A. (A.) janta it is pectinate distally. The latter species belongs to the A. (A.) rhamphe species group (Roback 1985), and the larval maxillary palp has a basal segment subdivided into three parts.
Taxon Treatment
- Niitsuma, Hiromi; 2013: Revision of the Japanese Ablabesmyia (Diptera: Chironomidae: Tanypodinae), with descriptions of three new species, Zootaxa 3664: 492-496. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
