Acerentulus sinensis
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Ordo: Protura
Familia: Acerentomidae
Genus: Acerentulus
Name
Acerentulus sinensis Wu, Donghui, 2007 – Wikispecies link – Pensoft Profile
- Acerentulus sinensis Wu, Donghui, 2007, Zootaxa 1561: 53-57.
Materials Examined
Type material. Holotype: female, from the coniferious forest of Nanhu, 43 º 51´N, 125 º 18´E, Changchun city, Jilin Province, northeastern China, collected by Dr. Donghui WU in July, 2006. Paratypes:5 females, same data as holotype. Holotype and paratypes are deposited in the Institute of Plant Physiology & Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, China.
Diagnosis
Diagnosis. Foretarsal sensillum f slightly near to e than to g, apices of both f and g surpassing base of tarsus, f longer than g, c' long and thin, its apex surpassing base of tarsus. P 1 a and P 2 a present on urotergite VII, urotergites VI and VII with 8 anterior setae (A 1, A 2, A 4 and A 5). Connecting line on urosternites IV-VI absent. Pores absent on urosternites I–III, simple pores on urosternite VI.Female squama genitalis with long pointed acrostylus, bipartite. Description. Body length: 1550 µm.
Head:150 µm long in dorsal view, setae pp and ls present, a absent (Fig. 1). Median pore present. Rostrum protruded. Pseudoculus almost circular, broader than long, longitudinally divided (Fig. 2), PR= 16. Canal of maxillary gland simple (Fig. 3), the proximal part 30 µm long with distinct tripartite posterior dilation, CF= 5. Maxillary palpus with two sensilla, one being seta-like and the other sensillum-like (Fig. 4). Labial palpus with apical tuft of setae and broad sensillum (Figs. 5).
Description
Legs: Foretarsus length 115 µm, claw 25 µm, without inner or outer flap, TR = 4.6 (Figs. 6, 7); Empodium length 6 µm, EU= 0.24; S-shaped seta longer than claw, 30 µm. Dorsal sensillum t 1 claviform, BS= 0.39; t 2 thin; t 3 shaped like a willow leaf. Exterior sensillum a really long, between y2 and y3; b long, subequal to c in length, base at same level as c; apices of b and c surpassing base of y3, b and c close to each other; d reaching the base of f; e not surpassing tarsus; f slightly near to e than to g, both apices of f and g surpassing tarsus, f longer than g. Interior sensillum a' a little broad and distal to t 1, reaching base of t 2; b' thin, surpassing base of c'; c' thin, its apex surpassing tarsal base. Ventral seta β 1 and interior seta δ 4 short, sensillum-like, β 1 shorter than δ 4. Interior setae δ 1, δ 2, δ 3 and δ 5 short but longer than δ 4, apically pointed. Pores present between a and a 3 and between t 3 and g. Middle tarsus length 45 µm, claw length 20 µm. Hind tarsus length 47 µm, claw length 22.5 µm.
Larva II Maturus Junior Imago Formula Complementary setae Formula Complementary setae Formula Complementary setae Dorsal Thorax I 4 1, 2 4 1, 2 4 1, 2 II-III ------ A2, 4, M1 ---------- P1, 1a, 2, 3, 4, 5, 5a () A2, 4, M1 ---------- P1, 1a, 2, 2a, 3, 4, 5, 5a () A2, 4, M1 P1, 1a, 2, 2a, 3, 4, 5, 5a Abdomen I ------ P1, 2, 2a, 3, 4 ------ A1, 2 -------------- P1, 2, 2a, 3, 4 () A1, 2, 5 P1, 2, 2a, 3, 4 II-V ----------() P1, 2, 2a, 3, 4, 4a, 5 ----------() A1, 2, 5 ---------- P1, 2, 2a, 3, 4, 4a, 5 () A1, 2, 5 P1, 2, 2a, 3, 4, 4a, 5 VI ----------() P1, 2, 2a, 3, 4, 4a, 5 ----------() A1, 2, 5 ---------- P1, 2, 2a, 3, 4, 4a, 5 () A1, 2, 4, 5 P1, 2, 2a, 3, 4, 4a, 5 VII ----------() P1, 2, 2a, 3, 4, 4a, 5 ----------() A1, 2, 4, 5 ---------- P1, 1a, 2, 2a, 3, 3a, 4, 4a, 5 () A1, 2, 4, 5 P1, 1a, 2, 2a, 3, 3a, 4, 4a, 5 VIII ----------() A5, M 2, 3, 4 ---------- P2, 3, 4, 5 () A2, 4, 5, M1, 2, 3, 4 ---------- P2, 3, 4, 5 () A2, 4, 5, M1, 2, 3, 4 P2, 3, 4, 5 IX 8 1, 2, 3, 4 12 1, 2, 3, 3a, 4, 5 12 1, 2, 3, 3a, 4, 5 X 8 1, 2, 3, 4 12 1, 2, 3, 3a, 4, 5 XI 6 1, 2, 3 6 1, 2, 3 XII 9 9 9 Ventral Thorax I --- A1, M1 -- P1, 2 A1, 1a, M1, 1a -- P1, 2, 3 A1, 1a, M1, 1a P1, 2, 3 II --- Ac, A1a, 2, M1 -- P1 Ac, A1a, 2, M1 -- P1, 2 Ac, A1a, 2, M1 P1, 2 III --- Ac, A1a, 2, M1 -- P1 Ac, A1a, 2, 3, M1 -- P1, 2 Ac, A1a, 2, 3, M1 P1, 2 Abdomen I --- Ac, A2 -- P1 Ac, A2 -- P1, 1a Ac, A2 P1, 1a II–III --- Ac -- Pc, P1a, 2 Ac, A2 -- Pc, P1a, 2 Ac, A2 Pc, P1a, 2 IV-VII --- Ac -- P1, 2, 3 Ac, A2 -- P1, 1a, 2, 3 Ac, A2 P1, 1a, 2, 3 VIII 4 A1, 2 -- A1, 2 -- P1a A1, 2 P1a IX 4 1a, 2 4 1a, 2 4 1a, 2 X 4 1a, 2 4 1a, 2 XI 2 2 6 1, 1a, 2 XII 6 1a, 2, 3 6 1a, 2, 3 6 1a, 2, 3 Body: Chaetotaxy as shown in Table 1 and Figs. 8–13. Thoracic tergites II–III each with two pair of dorsal anterior setae (A 2, A 4), seta P 2 a on meso- and metanotum nearer to P 3 than to P 2. Urotergites I–V each with three pairs of anterior setae (A 1, A 2, A 5), P 1 a and P 3 a absent; urotergites VI and VII with 8 anterior setae (A 1, A 2, A 4, A 5), P 1 a and P 3 a absent on urotergite VI, P 1 a and P 3 a present on urotergite VII; urotergites IX and X with 12 setae. Urosternites I–VII with 3 anterior setae; urosternite VIII with 4 anterior setae and 2 posterior setae; urosternites IX–X with 4 setae; urosternites XI–XII with 6 setae. Seta P 1 a and 2 a on thoracic tergites II and III, short and lanceolate, 2 µm long. Seta P 5 a on thoracic tergites II and III minute, 3 µm long. Seta M 1 a on thoracic sternite I, A 1 a on thoracic sternites I–III, P 1 a on abdominal sternites I–VI, P 2 a on abdominal tergites I, and P 2 a and P 4 a on abdominal tergites II–VI, short and sensillum-like, about 5 µm. Setae P 1 a, P 2 a, P 3 a and P 4 a on abdominal tergites VII and P 1 a on abdominal stergites VII, short hair-like, 6 µm long. Connecting line on urosternites IV-VI absents (Fig. 11). Integumental pores distinct (Figs. 8, 10– 13). Thoracic tergite II with two pairs of pores; one between A 2 and P 2, the other posterior to P 4; tergite III with a pair of pores anterior to P 2. Abdominal tergites I – VI with a pair of pores between P 1 and P 2, tergite VII with a pair of pores close to P 1 a; tergite VIII with a pair of pores between M 2 and M 3, without denticles. Abdominal sternites IV and VI each with a pair of pores anterior to P 1, sternite VII with one pore between P 1. Telson with a dorsal central pore and a pair of ventral pores at both sides. Abdominal appendages II and III each with three setae (Fig. 14). On abdomen VIII, striate band well developed, with distinct striae (Fig. 12, 13), comb with about 8–11 teeth (Fig. 15). An irregular row of minute granules visible just posterior to the strate band. Female squama genitalis is shown as Fig. 16. Maturus junior: Length of body 1250–1300 µm, foretarsus length 88–91 µm, TR = 4.5–5, BS= 0.44–0.46. Larva II: Foretarsal sensilla b' absent (Fig. 17–18). Length of body 960–1110 µm, foretarsus length 70– 75 µm, TR = 5.4–5.8, BS= 0.42–0.44.
Distribution
Distribution. Jilin Province, northeastern China.
Etymology
Etymology. The specific name sinensis refers to China, the country where the new species was found.
Discussion
Remarks. The new species is similar to A. silvanus (Szeptycki 1991) from Poland in chaetotaxy (urotergite VI and VII with 8 anterior setae, seta P 1 a and P 3 a absent on urotergite VI, P 1 a and P 3 a present on urotergite VII). It can be distinguished from A. silvanus by the characteristics of the foretarsal sensillae such as the length of f and c', the apex of c' surpassing tarsus, f longer than g, and by the shape of female squama genitalis. Compared with the other Far East species of Acerentulus, the new species differs clearly from A. kisonis, A. keikoae and A. omoi in chaetotaxy, Pc absent on urosternite VII of the new species.
Taxon Treatment
- Wu, Donghui; Yin, Wenying; 2007: New records of the genera Acerentulus and Brasilidia (Protura: Acerentomidae) from China, with descriptions of two new species, Zootaxa 1561: 53-57. doi
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