Palpostilpnus, Aubert, 1961

Pham, Nhi Thi, Sheng, Mao-Ling, Park, Clara, Tran, Duong Dinh & Reshchikov, Alexey, 2024, First record of the genus Palpostilpnus Aubert (Ichneumonidae: Phygadeuontinae) from Vietnam, with descriptions of eight new species, Zootaxa 5514 (6), pp. 525-549 : 547-549

Key to the world species of Palpostilpnus , modified from Reshchikov et al. (2019)

1. Fore wing with infuscate transverse band.................................................................. 2

-. Fore wing lacking infuscate transverse band................................................................ 5

2. Fore wing with one infuscate transverse band; antenna without median white band; T2 with coarse punctures; propodeum sloping gradually..................................................................................... 3

-. Fore wing with two infuscate transverse bands; antenna with median white band; T2 with fine punctures; Propodeum sloping steeply.............................................................................................. 4

3. Mesosoma mostly reddish; infuscate transverse band of fore wing rather distal; hind tarsus brown, with white basitarsus; body shallowly and sparsely punctate; ovipositor as long as hind basitarsus; T1 about 3.0× as long as apical broad............................................................................................. P. rufinator ( Aubert, 1961)

-. Mesosoma black; infuscate transverse band of fore wing on distal 0.6; hind tarsus white; body coarsely and densely punctate; ovipositor 1.4× as long as hind basitarsus; T1 1.8× as long as apical broad................................................................................................. P. mangrovi Reshchikov, Santos, Liu, Barthélémy, 2019

4. Frons, mesonotum and mesosternum transversally striated, shiny; ovipositor 1.5× as long as hind tarsus.................................................................................................. P. striator ( Aubert, 1961)

-. Frons, mesonotum and mesosternum finely punctate, entirely dull; ovipositor 2.1× as long as hind tarsus............................................................................................... P. papuator ( Aubert, 1961)

5. Occipital carina broadly absent dorsally; T1 short and stout, 1.5× as long as apical width............................. 6

-. Occipital carina complete dorsally; T1 longer, at least 1.7× as long as apical width.................................. 9

6. Combined area of propodeum (area superomedia and area petiolaris) open anteriorly ( Figs 11G , 14E ).................. 7

-. Combined area of propodeum present ( Figs 6G , 12G ).........................................................8

7. Body black with reddish markings ( Figs 2E , 11 ); basal half of scutellum with arched wrinkles ( Fig. 11F )................................................................. P. ngoclinhensis Pham, Sheng, Park, Tran & Reshchikov , sp. nov

-. Body reddish yellow with black markings ( Figs 2G , 14 ); scutellum punctate, with setae ( Fig. 14C )..................................................................... P. taynguyenensis Pham, Sheng, Park, Tran & Reshchikov , sp. nov

8. Body reddish with black markings ( Fig. 3B ); [mesosoma entirely reddish or with reddish marking basally on propodeum]; mesoscutum shorter than its maximum width ( Fig. 12C )....... P. pterodactylus Reshchikov, Santos, Liu, Barthélémy, 2019

-. Body ferruginous with black markings ( Fig. 2D ); mesoscutum as long as its maximum width ( Fig. 6F )................................................................... P. incompletus Pham, Sheng, Park, Tran & Reshchikov , sp. nov

9. Combined area of propodeum absent or, if present anteriorly open.............................................. 10

-. Combined area of propodeum present and anteriorly closed................................................... 22

10. T2–T4 with a pair of small black sports laterally or T2 with a transverse black band and T3–T4 with a pair of small black sports or sometimes T2–T4 entirely reddish, without black markings................................................. 11

-. T2–T4 with a transverse black band or entirely black........................................................ 12

11. Mesosoma black with yellow marks ( Figs 7C, 7F ); mesoscutum with coarse granulose texture and distinct fine punctures............................................................................. P. maculatus Sheng & Sun, 2013

-. Mesosoma yellow, with lower part of mesopleuron and prescutellar groove black; mesoscutum with fine leathery texture and indistinct.............................................. P. hainanensis Reshchikov, Santos, Liu, Barthélémy, 2019

12. Mesoscutum black, with or without yellow markings........................................................ 13

-. Mesoscutum mostly yellow or brown, with or without black markings........................................... 17

13. Mesoscutum entirely black ( Fig. 5C ); propodeum without any carinae ( Fig. 5G ).................................................................................. P. hoanglienensis Pham, Sheng, Park, Tran & Reshchikov , sp. nov.

-. Mesoscutum with yellow markings; propodeum with posterior part of lateromedian longitudinal carina and lateral part of posterior transverse carina present....................................................................... 14

14. Mesoscutum with anterior 0.3 yellow ( Fig. 4E ); scutellum entirely yellow ( Fig. 4E )................................................................................... P. cattienensis Pham, Sheng, Park, Tran & Reshchikov , sp. nov

-. Mesoscutum with antero-laterally yellow ( Fig. 8E ); scutellum entirely black or with yellow marking.................. 15

15. Mesosoma largely black ( Fig. 8D ); postero-ocellar distance 3.2× ocular-ocellar distance ( Fig. 8B )................................................................... P. melanothoracicus Pham, Sheng, Park, Tran & Reshchikov , sp. nov

-. Mesosoma largely reddish; postero-ocellar distance 1.5–2.4× ocular-ocellar distance............................... 16

16. Propodeum with area postero-externa complete; scutellum entirely black; ovipositor 0.9× as long as hind basitarsus................................................................ P. trifolium Reshchikov, Santos, Liu, Barthélémy, 2019

-. Propodeum with area postero-externa incomplete; scutellum laterally yellow; ovipositor 3.5× as long as hind basitarsus............................................................. P. tamasek Reshchikov, Santos, Liu, Barthélémy, 2019

17. Epicnemial carina absent; hind tibia apically ferruginous.............. P. ranui Reshchikov, Santos, Liu, Barthélémy, 2019

-. Epicnemial carina present; hind tibia apically black or entirely black........................................... 18

18. Area postero-externa open anteriorly; mesoscutum with black or brown markings................................. 19

-. Area postero-externa present; mesoscutum entirely yellowish, without black or brown markings...................... 21

19. Face wider, 1.7 times as wide as high; ovipositor sheath shorter than apical depth of metasoma...................................................................................... P. aki Reshchikov, Santos, Liu, Barthélémy, 2019

-. Face narrower, 1.2× as wide as high ( Figs 9A , 10A ); ovipositor sheath distinct longer than apical depth of metasoma ( Figs 9D , 10G ).............................................................................................. 20

20. Postero-ocellar distance 1.7× as long as ocular-ocellar distance ( Fig. 9B ); superomedia and area petiolaris of propodeum open anteriorly (9G); fore wing vein 1cu-a postfurcal to M&RS; juxtacoxal carina complete................................................................................ P. melinhensis Pham, Sheng, Park, Tran & Reshchikov , sp. nov.

-. Postero-ocellar distance 0.8× as long as ocular-ocellar distance ( Fig. 10B ); superomedia and area petiolaris of propodeum entirely absent ( Fig. 10C ); fore wing vein 1cu-a interstitial to M&RS; juxtacoxal carina absent......................................................................... P. meovacensis Pham, Sheng, Park, Tran & Reshchikov , sp. nov.

21. Postero-ocellar distance 2.0× as long as ocular-ocellar distance; mesosoma elongate, about 1.5×as long as high; hind part of T2 with black lens-shaped mark; T3 and T4 transversally black in the middle................................................................................................... P. angka Reshchikov, Santos, Liu, Barthélémy, 2019

-. Postero-ocellar distance 3.6× as long as ocular-ocellar distance; mesosoma short, about 1.25× as long as high; hind part of T2–T4 with a black band................................ P. singaporensis Reshchikov, Santos, Liu, Barthélémy, 2019

22. Mesosoma and metasoma entirely black.................................................................. 23

-. Mesosoma and metasoma black with yellow markings....................................................... 24

23. Antenna with 34 flagellomeres; lower side of hind femur without tubercles; ovipositor sheath shorter than apical depth of metasoma; antenna with middle flagellomeres white dorsally; hind tarsus testaceous......... P. brevis Sheng & Broad, 2011

-. Antenna with 22 flagellomeres; lower side of hind femur with tubercles; ovipositor sheath longer than apical depth of metasoma; antenna with middle flagellomeres entirely brownish; hind tarsus black...................... P. palpator ( Aubert, 1961)

24. Mesoscutum with large, shallow punctures; postero-ocellar distance 3.4× as long as ocular-ocellar distance........................................................................ P. angkor Reshchikov, Santos, Liu, Barthélémy, 2019

-. Mesoscutum densely reticulate-punctate; postero-ocellar distance 1.25× as long as ocular-ocellar distance.......................................................................................... P. rotundatus Sheng& Sun, 2013

Figures

FIGURE 3. Habitus of new records of Palpostilpnus from Vietnam: A. P. maculatus Sheng & Sun, 2013; B. P. pterodactylus Reshchikov, Santos, Liu, Barthélémy, 2019; C. P. tamasek Reshchikov, Santos, Liu, Barthélémy, 2019 (scale bar = 1 mm).

FIGURE 4. Palpostilpnus cattienensis sp. nov., holotype male: A. head, frontal view; B. head, dorsal view; C. propodeum; D. mesosoma, lateral view; E. mesonotum; F. tergites (scale bar = 0.2 mm).

FIGURE 5. Palpostilpnus hoanglienensis sp. nov., holotype female:A. head, frontal view; B. head, dorsal view; C. mesonotum; D. ovipositor; E. median flagellomeres, ventral view; F. mesosoma, lateral view; G. propodeum; H. tergites (scale bar = 0.2 mm, D = 0.1 mm).

FIGURE 6. Palpostilpnus incompletus sp. nov., holotype male: A. head, frontal view; B. head, dorsal view; C. head, posterior view; D. tergites; E. mesosoma, lateral view; F. mesonotum; G. propodeum (scale bar = 0.2 mm).

FIGURE 7. Palpostilpnus maculatus Sheng & Sun, female from Vinh Phuc Province: A. head, frontal view; B. head, dorsal view; C. mesonotum; D. ovipositor sheath; E. median flagellomeres, ventral view; F. mesosoma, lateral view; G. propodeum; H. tergites (scale bar = 0.2 mm).

FIGURE 8. Palpostilpnus melanothoracicus sp. nov., holotype male:A. head, frontal view; B. head, dorsal view; C. propodeum; D. mesosoma, lateral view; E. mesonotum; F. tergites (scale bar = 0.2 mm).

FIGURE 9. Palpostilpnus melinhensis sp. nov., holotype female:A. head, frontal view; B. head, dorsal view; C. mesonotum; D. ovipositor; E. flagellomeres 8–25, ventral view; F. mesosoma, lateral view; G. propodeum; H. tergites (scale bar = 0.2 mm).

FIGURE 10. Palpostilpnus meovacensis sp. nov., holotype female: A. head, frontal view; B. head, dorsal view; C. propodeum; D. mesosoma, lateral view; E. mesonotum; F. tergites; G. ovipositor (scale bar = 0.2 mm).

FIGURE 11. Palpostilpnus ngoclinhensis sp. nov., holotype male:A. head, frontal view; B. head, dorsal view; C. head, posterior view; D. tergites; E. mesosoma, lateral view; F. mesonotum; G. propodeum (scale bar = 0.2 mm).

FIGURE 12. Palpostilpnus pterodactylus Reshchikov, Santos, Liu, Barthélémy, 2019, female from Cao Bang Province: A. head, frontal view; B. head, dorsal view; C. mesonotum; D. ovipositor sheath; E. median flagellomeres, ventral view; F. mesosoma, lateral view; G. propodeum; H. tergites (scale bar = 0.2 mm).

FIGURE 14. Palpostilpnus taynguyenensis sp. nov., holotype female: A. head, frontal view; B. head, dorsal view; C. mesonotum; D. mesosoma, lateral view; E. propodeum; F. tergites; G. ovipositor (scale bar = 0.2 mm; G = 0.1 mm).

FIGURE2. Habitusof new species of Palpostilpnus fromVietnam:A.P.cattienensis sp. nov., holotypemale;B.P.hoanglienensis sp. nov., holotype female; C. P. melanothoracicus sp. nov., holotype male; D. P. incompletus sp. nov., holotype male; E. P. ngoclinhensis sp. nov., holotype male; F. P. melinhensis sp. nov., holotype female; G. P. taynguyenensis sp. nov., holotype female; H. P. meovacensis sp. nov., holotype female (scale bar = 1 mm).