Euglyptus, Broun, 1893

Byeon, Ui-Joung, Chandler, Donald S., Leschen, Richard A. B. & Park, Jong-Seok, 2025, Revision of the New Zealand genus Euglyptus (Coleoptera: Staphylinidae: Pselaphinae) with eight new species, Acta Entomologica Musei Nationalis Pragae 65 (1), pp. 31-59 : 35

Key to species of the genus Euglyptus

1 Visible tergite 2 (V) with median impression and discal striae ( Figs 1J , 5D , 10D , 13D , 14D ). ........................ 2

– Visible tergite 2 (V) lacking median impression and discal striae ( Figs 2D , 3D , 4D , 7D , 8D , 9D , 11D , 12D , 15D ). ......................................................................... 7

2(1) Elytra with discal stria extending from outer (fourth) fovea to elytral posterior margin ( Figs 1H , 14A ). .... 3

– Elytra lacking discal stria extending from outer (fourth) fovea ( Figs 5A , 10A , 13A ). ......................... 5

3(2) Eye with approximately 9–10 facets in dorsal view............................................. E. longiceps Broun, 1921

– Eye with more than 15 facets in dorsal view. ........... 4

4(3) Pronotum with distinct punctures, narrower than head ( Figs 6A–B ); paramere short, with small basal apophysis, strongly curved laterally ( Figs 6C–H ). ....... ............................................... E. elegans Broun, 1893

– Pronotum almost lacking punctures, wider than head ( Figs 14A–B ); paramere short, with small apophysis located in basal fourth, straight in ventral and lateral view ( Figs 14E–J ). ............. E. sublaevis Broun, 1921

5(2) Width of median impression of visible tergite 2 approximately 1/16 of its width (excluding paratergites) ( Fig. 13D ); median lobe of aedeagus undivided ( Figs 13E–J ). .......................... E. robertensis sp. nov.

– Width of median impression of visible tergite 2 approximately 1/6–1/7 of its width (excluding paratergites) ( Figs 5D , 10D ); median lobe of aedeagus forked or split ( Figs 5E–J , 10E–J ). ........................................... 6

6(5) Body length more than 1.4 mm, forebody length more than 1.0 mm ( Fig. 5A ); antennomere 5 approximately 1.3 times longer than wide, joint between antennomeres 4–7 relatively long ( Fig. 5C ); median lobe with complex structure, small branch extends from posterior 1/3, apex of small branch with sharply bifurcate apophysis, median lobe with several sharp and long apophyses ( Figs 5E–J ). ........ E. dunedinensis sp. nov.

– Body length less than 1.3 mm, forebody length less than 0.9 mm ( Fig. 10A ); antennomere 5 approximately 1.7 times longer than wide, joint between antennomeres 4–7 relatively short ( Fig. 10C ); median lobe trifurcate in distal part, left apophysis apex bifurcate, middle and right apophyses simple with sharp apex, right apophysis longest in ventral view ( Figs 10E–J ). ........................................................ E. parvus sp. nov.

7(1) Antennomere X inverted trapezoidal shape, widest in or near apex, usually wider than XI ( Figs 2C , 3C , 4C , 7C , 8C , 11C , 15C ). ............................................. 8

– Antennomere X globular shape, widest in or near middle, usually narrower than XI ( Figs 9C , 12C ). .................. 14

8(7) Antennomere V as long as wide ( Fig. 11A ). ............. .......................................... E. punctatosimilis sp. nov.

– Antennomere V distinctly longer than wide ( Figs 2A , 3A , 4A , 7A , 8A , 15A ). .............................................. 9

9(8) Body length less than 1.3 mm, forebody length less than 1.0 mm; pronotum slightly wider than long ( Figs 3A–B , 4A–B ). ......................................................... 10

– Body length more than 1.4 mm, forebody length more than 1.0 mm; pronotum slightly longer than wide ( Figs 2A–B , 7A–B , 8A–B , 15A–B ). ................................ 11

10(9) Left paramere apex slightly convex, right paramere relatively narrow basally, apex somewhat sinuate; median lobe small branch extends from apical fifth, apex of branch bifurcate ( Figs 4E–J ). ...... E. boreus sp. nov.

– Left paramere apex bluntly rounded, right paramere broad basally, apex pointed; median lobe long branch from apical third, apex of branch not bifurcate ( Figs 3E–J ). ....................................... E. bifurcatus sp. nov.

11(9) Pronotum with narrow transverse antebasal sulcus ( Fig. 7A ); median lobe of aedeagus with long and slender apophysis extending from base, this apophysis with two small apical teeth ( Figs 7E–J ). ...................... ........................................... E. foveicollis Broun, 1912

– Pronotum with broad transverse antebasal sulcus ( Figs 2B , 8B , 15B ); median lobe of aedeagus relatively simple ( Figs 2E–J , 8E–J , 15E–J ). ............................ 12

12(11) Median lobe with distinct apophysis extending from the base ( Figs 8E–J ). ...... E. latefossatus sp. nov.

– Median lobe unmodified, lacking any apophysis ( Figs 2E–J , 15E–J ). ........................................................... 13

13(12) Apex of median lobe with thin membranous structure; right paramere curved laterally in dorsal view ( Figs 2E–J ). ................ E. abnormis Broun, 1921

– Apex of median lobe with flat apical lobe directed laterally; right paramere not curved in dorsal view ( Figs 15E–J ). .................................. E. waimatensis sp. nov.

14(7) Antennomere V as long as wide; temples of head posterolaterally angulate; median lobe with apical margin thin and fan-shaped ( Figs 12E–J ).................. ........................................ E. punctatus (Broun, 1893)

– Antennomere V distinctly longer than wide; temples of head posterolaterally oblique; median lobe apex abruptly bent dorsally ( Figs 9E–J ). .............................. ........................................ E. longicornis Broun, 1912

Figures

Fig. 1. Characters of Euglyptus Broun, 1893 (based on E. elegans Broun, 1893). A – male habitus dorsal view; B – male habitus ventral view; C – male head lateral view; D – female head later view; E – head; F – prosternum; G – meso- and metaventrite; H – elytra; I – abdominal sternites; J – abdominal tergites. Abbreviations: abs – abdominal sternite, abt – abdominal tergite, bef – basal elytral fovea, blf – basolateral fovea, ds – discal stria, dtp – dorsal tentorial pit, gc – gular carina, laf – lateral antebasal fovea, lmcf – lateral mesocoxal fovea, lmsf – lateral mesoventral fovea, lmtf – lateral metaventral fovea, lpcf – lateral procoxal fovea, ls – lateral stria, maf – median antebasal fovea, mls – median longitudinal sulcus, mmsf – median mesoventral fovea, mpc – median prosternal carina, msv – mesoventrite, mtv – metaventrite, ps – prosternum, shef – subhumeral elytral fovea, ss – sutural stria, t – tergite, v – ventrite, vtp – ventral tentorial pit.

Fig. 5. Euglyptus dunedinensis sp. nov. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 10. Euglyptus parvus sp. nov. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 13. Euglyptus robertensis sp. nov. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 14. Euglyptus sublaevis Broun, 1921. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 2. Euglyptus abnormis Broun, 1921. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 3. Euglyptus bifurcatus sp. nov. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 4. Euglyptus boreus sp. nov. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig.7. Euglyptus foveicollis Broun, 1912. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 8. Euglyptus latefossatus sp. nov. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 9. Euglyptus longicornis Broun, 1912. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig.11. Euglyptus punctatosimilis sp. nov. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 12. Euglyptus punctatus (Broun, 1983). A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 15. Euglyptus waimatensis sp. nov. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 6. Euglyptus elegans Broun, 1893. A – habitus dorsal view; B – pronotum, C, D – aedeagus ventral view; E, F – aedeagus lateral view; G, H – aedeagus dorsal view. Scale bars: A = 1 mm; B–H = 0.1 mm.