Micronecta (Micronecta) arcuata, Tran, 2021

Ha, Tuyet Ngan & Tran, Anh Duc, 2021, Taxonomy of Micronectidae (Heteroptera: Nepomorpha) from Vietnam, with descriptions of 11 new species, European Journal of Taxonomy 756, pp. 1-82 : 34-36

Micronecta (Micronecta) arcuata sp. nov.

urn:lsid:zoobank.org:act:388F73BC-CA08-4397-8570-B2B163B622AC

Figs 5G , 9F–K

Diagnosis

Body length 1.6–2.2. Pronotum longer than median head length. Hemelytron punctate, with brown markings at middle part.

Males: fore femur with a pair of spines on middle third ventrally, two spines on distal third dorsally; fore tibia without spine; pala: lower row with ca 18 bristles, upper row with ca 12 bristles; palar claw sub-triangular, apical margin nearly straight ( Fig. 9F ). Median lobe of sternite VII short, with four long setae and an angular apex ( Fig. 9H ). Free lobe sub-rectangular, mesial angle rounded, lateral angle square with ca 17 long setae, posterior margin slightly sinuate ( Fig. 9I ). Left paramere: shaft broad, flat, and evenly curved outwards; apex narrowly rounded; basal lobe large, sub-rectangular ( Fig. 9K ). Right paramere: shaft parallel sided, strongly bent at distal fourth (by ca 45°), slightly thickened before rounded apex; pars stridens processus with ca 15 ridges ( Fig. 9J ).

Etymology

The species epithet ‘ arcuata ’ refers to the shape of the right paramere, which is slender and bent like a bow.

Material examined

Holotype

VIETNAM • ♂; Ha Giang Prov., Vi Xuyen, Nat’ road 2, Phuong Do commune, Phuong Do stream, near bridge; 9 May 2014; A.D. Tran et al. leg.; TAD1407 ; ZVNU.

Paratypes

VIETNAM – Ha Giang Prov. • 4 ♂♂, 1 ♀; same locality data as for holotype; ZVNU . – Lang Son Prov. • 1 ♂; Loc Binh, Mau Son, Khuoi Tang stream; 590 m a.s.l.; 6 Nov. 2020; A.D. Tran et al. leg.; TAD20-34 ; ZVNU . – Phu Tho Prov. • 1 ♂, 2 ♀♀; Xuan Son N.P. , Ban Cai, Cai stream, site 3, by the road to Tan Son; 7 Jun. 2013; A.D. Tran et al. leg.; TAD1339 ; ZVNU • 2 ♂♂, 2 ♀♀; Xuan San N.P. , Kim Thuong, Ha Bang stream; 28 Aug. 2013; A.D. Tran et al. leg.; TAD1344 ; ZVNU • 1 ♀; Xuan Son N.P. , Ban Coi, Coi stream, site 1, water from underground ; 29 Aug. 2013; A.D. Tran et al. leg.; TAD1349 ; ZVNU • 1 ♂, 2 ♀♀; Xuan Son N.P. , Tan Ong stream, 4 km from Chin Tang waterfall; 21°04.288′ N, 104°57.271′ E; 26 Aug. 2014; T.S. Nguyen leg.; TS1405 ; ZVNU • 2 ♂♂, 7 ♀♀; Xuan Son N.P. , Xoan stream, near its confluence with Ha Bang stream; 21°5.303′ N, 104°57.559′ E; 27 Aug. 2014; T.S. Nguyen leg.; TS1407 ; ZVNU • 1 ♂, 1 ♀; Xuan Son N.P. , Than stream, site 3; 21°11.393′ N, 104°52.625′ E; 27 Aug. 2015; T.S. Nguyen leg.; TS8516 ; ZVNU • 13 ♂♂, 9 ♀♀; Xuan Son N.P. , Than stream, site 2; 21°11.257′ N, 104°52.382′ E; 28 Aug. 2015; T.S. Nguyen leg.; TS1415 ; NHMW • 10 ♂♂, 14 ♀♀; Xuan Son N.P. , Ha Bang stream, Ha Bang village area; 21°04.343′ N, 104°59.182′ E; 25 May 2015; T.S. Nguyen leg.; TS1510 ; ZRC • 5 ♂♂, 4 ♀♀; Xuan Son N.P. , Than stream, site 2; 21°11.257′ N, 104°52.382′ E; 24 May 2015; T.S. Nguyen leg.; TS1515 ; ZVNU • 3 ♂♂; Xuan Son N.P. , Xoan stream, near Lang Village; 21°5.453′ N, 104°56.122′ E; 21 May 2015; T.S. Nguyen leg.; TS1501 ; ZVNU • 4 ♂♂, 6 ♀♀; Xuan Son N.P ., Xoan stream, near Lang Village; 21°5.453′ N, 104°56.122′ E; 5 May 2016; T.S. Nguyen leg.; TS1601 ; ZVNU • 3 ♂♂; Xuan Son N.P. , Than stream, site 2; 21°11.257′ N, 104°52.382′ E; 8 May 2016; T.S. Nguyen leg.; TS1615 ; ZVNU • 6 ♂♂, 5 ♀♀; Xuan Son N.P. , Than stream, site 3; 21°11.393′ N, 104°52.625′ E; 7 May 2016; T.S. Nguyen leg.; TS1616 ; ZVNU • 1 ♂; Xuan Son N.P. , Xoan stream, near its confluence with Ha Bang stream; 21°5.303′ N, 104°57.559′ E; 22 May 2015; T.S. Nguyen leg.; TS1507 ; ZVNU • 3 ♂♂, 4 ♀♀; Xuan Son N.P. , Xoan stream, near its confluence with Ha Bang stream; 21°5.303′ N, 104°57.559′ E; 5 May 2015; T.S. Nguyen leg.; TS1607 ; ZVNU • 6 ♂♂, 3 ♀♀; Xuan Son N.P. , Xoan stream, Xoan village area; 21°05.270′ N, 104°57.591′ E; 23 May 2015; T.S. Nguyen leg.; TS1509 ; ZVNU • 4 ♂♂; Xuan Son N.P. , Xoan stream, Xoan village area; 21°05.270′ N, 104°57.591′ E; 7 May 2016; T.S. Nguyen leg.; TS1609 ; ZVNU • 1 ♂; Xuan Son N.P. , Tan Ong stream, 4 km from Chin Tang waterfall; 21°04.288′ N, 104°57.271′ E; 22 May 2015; T.S. Nguyen leg.; TS1505 ; ZVNU • 1 ♂, 1 ♀; Xuan Son N.P., Ha Bang stream, near its confluence with Xoan stream; 21°5.318′ N, 104°58.87′ E; 22 May 2015; T.S. Nguyen leg.; TS1506 ; ZVNU • 2 ♂♂, 3 ♀♀; Xuan Son N.P. , Ha Bang stream, near its confluence with Xoan stream; 21°5.318′ N, 104°58.87′ E; 6 May 2016; T.S. Nguyen leg.; TS1606ĐT ; ZVNU • 1 ♂, 2 ♀♀; Xuan Son N.P. , Ha Bang stream, Ha Bang village area; 21°04.343′ N, 104°59.182′ E; 7 May 2016; T.S. Nguyen leg.; TS1610 ; ZVNU • 2 ♂♂, 3 ♀♀; Xuan Son N.P. , Coi stream, site 1, by the road to Tan Son; 21°09.204′ N, 104°56.927′ E; 8 May 2016; T.S. Nguyen leg.; TS1617 ; ZVNU • 1 ♂, 5 ♀♀; Xuan Son N.P. , Coi stream, site 2, near concrete bridge; 21°09.130′ N, 104°56.761′ E; 24 May 2015; T.S. Nguyen leg.; TS1518 ; ZVNU • 1 ♂, 2 ♀♀; Xuan Son N.P. , Lap stream, the second concrete bridge from Ngoc waterfall; 21°08.322′ N, 104°56.256′ E; 28 Aug. 2014; T.S. Nguyen leg.; TS1413 ; ZVNU . – Hanoi • 2 ♂♂, 6 ♀♀; Ba Vi N.P. , Khoang Xanh, Tien stream; 95 m a.s.l.; 27 Apr. 2012; Q.H. Ngo and A.D. Tran leg.; TAD1208 ; ZVNU . – Hoa Binh Prov. • 12 ♂♂, 30 ♀♀; Lac Son, Tu Do commune, Mu waterfall and down stream ; 27 Aug. 2020; A.D. Tran, P.L. Le and T.C. Nguyen leg.; TAD20-02 ; ZVNU .

Description

COLOUR ( Fig. 5G ). Dorsum generally orangish-brownish yellow. Frons and vertex pale yellowish, eyes reddish brown. Pronotum yellowish brown, with one longitudinal yellow stripe on anterior part and two transverse yellow stripes on posterior part. Hemelytron with minute red dots scattered especially on hyaline anterior band of clavus, on boundary between corium and embolium. Corium with three obscure light brown markings at middle part. Membrane translucent and brownish. Venter of thorax and abdomen, and legs pale or light yellow.

Structural characteristics

MACROPTEROUS MALES. Body length 1.63–2.16 (holotype: 1.73), width 1.0–1.13 (holotype: 0.81). Head width 0.62–0.66 (holotype: 0.63). Pronotum about 2.5 times as wide as long (0.70: 0.29). Pronotum slightly wider than head. Synthlipsis about 1.5 times as wide as posterior width of an eye (0.30: 0.23). Lengths of leg segments: fore leg: femur 0.28, tibia 0.13, pala 0.12; middle leg: femur 0.58, tibia 0.20, tarsus 0.25, claw 0.18; hind leg: femur 0.45, tibia 0.28, tarsus I 0.29, tarsus II 0.12, claw 0.03. Prestrigilar flap on segment V with short apex ( Fig. 9G ). Strigil present. Median lobe of sternite VII, free lobe, and parameres as in diagnosis.

MACROPTEROUS FEMALES. Body length 1.63–2.09, width 0.94–1.19. Head width 0.64–0.67. Pronotum about 2.5 times as wide as long (0.67: 0.22). Pronotum slightly wider than head. Synthlipsis about 1.5 times as wide as posterior width of an eye (0.32:0.20). Lengths of leg segments: fore leg: femur 0.23, tibiotarsus 0.2; middle leg: femur 0.55, tibia 0.2, tarsus 0.3, claw 0.18; hind leg: femur 0.41, tibia 0.29, tarsus I 0.28, tarsus II 0.12, claw 0.03.

Distribution

Northern Vietnam: Ha Giang, Phu Tho, Hanoi.

Remarks

See Remarks under M. acuminata sp. nov.

Figures

Fig. 5. Habitus photos of species of Micronecta Kirkaldy, 1897, ♂♂. A. M. grisea (Fieber, 1844) (ZRC). B. M. guttatostriata Lundblad, 1933 (ZVNU). C. M. drepani Nieser, 2000 (ZVNU). D. M. erythra Nieser, Chen & Yang, 2005, right hemelytron (ZVNU). E. M. cultellata sp. nov., holotype (ZVNU). F. M. anatolica Lindberg, 1922 (ZVNU). G. M. arcuata sp. nov., holotype (ZVNU). H. M. fulvopicta sp. nov., holotype (ZVNU). I. M. acuminata sp. nov., holotype (ZVNU), right hemelytron and genitalia dissected. J–L. M. vietnamica sp. nov., J = holotype (ZVNU). All to the same scale.

Fig. 9. Morphological features of species of Micronecta Kirkaldy, 1897, ♂♂. A–E. M. anatolica Lindberg, 1922 (ZVNU). F–K. M. arcuata sp. nov., paratype (ZVNU). A, G = prestrigilar flap; B, H = median lobe of sternite VII; C, I = free lobe; D, J = right paramere; E, K = left paramere; F = fore leg.