Gyrinus undetermined
Creators: name: Gustafson, Grey T.
name: Short, Andrew E. Z.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Gyrinidae
Gyrinus
Gyrinus undetermined

description: Key to the adult Gyrinus species of Venezuela   
 1 Dorsally black in color (Figs 33–38), venter mostly dark – medially brown to black in color; elytron with punctures of all 11 serial striae distinguishable (Figs 33–38, 43, 45); metanepisternal ostiole present. Subgenus Oreogyrinus.................................. 2   
 – Dorsally olive green in color (Figs 1–6), venter lighter – yellow to orange in color; elytron with at least one (stria I) or more medial serial striae totally effaced or with strongly reduced punctures (Figs 1–6, 18, 20, 25, 27); metanepisternal ostiole absent. Subgenus Neogyrinus............................................................................................... 5   
2 Pronotal transverse crease strongly impressed (Figs 33–36, 39–40); pronotal and elytral lateral margins densely riffled (Figs 39–42); dorsal surface not iridescent (Figs 33–36); strongly sexually dimorphic, female elytra strongly reticulate laterally (Figs 33, 35, 44, 46)........................................................................................................... 3  
 – Pronotal transverse crease greatly reduced (Figs 37–38); pronotal and elytral lateral margins without riffles; dorsal surface iridescent (Figs 37–38); not sexually dimorphic in elytral sculpturing..........................  Gyrinus (Oreogyrinus) iridinus sp. nov.    
3 Pronotum relatively weakly wrinkled, laterally with sparserwrinkles (Fig. 39); elytral lateral margin weakly interrupted in apical 1/5 by swelling (as in Fig. 41); aedeagus not strongly constricted in apical 1/3, more evenly attenuated towards apex, at most weakly constricted in apical 1/3............................................................................... 4  
 – Pronotum more strongly wrinkled, laterally often with many wrinkles (Fig. 40); elytral lateral margin strongly interrupted in apical 1/5 by large swelling (Fig. 42); aedeagus strongly constricted in apical 1/3 (Fig. 49); gonocoxae curved with truncate apices (Fig. 59).....................................  Gyrinus (Oreogyrinus) vinolentus sp. nov.    
 4 Female elytron more reticulate, nearly entirely covered in reticulation or at least to elytral interval II; male aedeagus attenuated in basal 2/3, weakly expanded laterally in apical 1/3 (Fig. 47); gonocoxae not studied. Not confirmed to be in Venezuela..................................................  Gyrinus (Oreogyrinus) colombicus  Régimbart, 1883   
 – Female elytron less reticulate, reticulation reaching at most to elytral interval IV; male aedeagus strongly parallel sided, apex broadly rounded (Fig. 48); gonocoxae relatively straight, not strongly curved, apices weakly emarginate with prominent lateral angle (Fig. 58).........................................  Gyrinus (Oreogyrinus) venezolensis  Ochs, 1953   
5 Body form broadly oval (Figs 1–3, 5); elytra with non-uniform reticulation, lateral reticulation distinctly more strongly impressed than medially................................ 6  
 – Body form narrowly oval (Figs 4, 6); elytra with more uniform reticulation, laterally not distinctly more strongly impressed.................................................................... 8   
6 Elytra with at least serial striae VIII–IX sulcate (as in Fig. 7); elytral apex obliquely truncate (Figs 1, 8), at most with incomplete border present laterally; ultimate abdominal tergite without strong medial acumination.................................................... 7  
 – Elytra with serial striae VIII–IX at most weakly sulcate (Fig. 10); elytral apex rounded, with complete border (Fig. 11); ultimate abdominal tergite often with strong medial acumination.................................  Gyrinus (Neogyrinus) gibbus  Aubé, 1838   
 7 Elytral serial striae VIII–X never lineate, with distinctly separated round punctures (Fig. 21); epipleural angle of elytral apex always distinct, normally with denticle (Fig. 9); aedeagus with median lobe shorter than parameres, apex with broad process (Fig. 29); gonocoxae short, with strongly truncate apices (Fig. 53). Very widespread Neotropical species.................................  Gyrinus (Neogyrinus) ovatus  Aubé, 1838   
 – Elytral serial striae VIII–X lineate basally with ovoid punctures; epipleural angle of elytral apex always indistinct, never with denticle; aedeagus with median lobe as long as parameres, apex evenly rounded without broad process (Fig. 30); gonocoxae elongate, apices laterally weakly emarginate with prominent lateral angle (Fig. 56). Species known only from the Gran Sabana in southeastern Venezuela......................................................................................  Gyrinus (Neogyrinus) sabanensis sp. nov.    
 8 Elytral serial striae II–XI evident (Figs 24, 27), striae VI–IX sulcate with distinct round punctures (Fig. 28); elytra without distinct pre-apical medial plica; elytral apex obliquely truncate, with distinct epipleural angle (Fig. 24); aedeagus with median lobe exceptionally long and broad, apex truncate (Fig. 32); gonocoxae shorter with strongly emarginate apices producing a strongly pointed medial angle (Fig. 55)...........................................................................  Gyrinus (Neogyrinus) rozei  Ochs, 1953   
 – Elytral serial striae VI–XI evident (Fig. 22), striae VI–X sulcate with linear punctures (Fig. 26); elytra with distinct medial pre-apical plica (Fig. 23); elytral apex rounded, without distinct epipleural angle (Fig. 23); aedeagus shorter than parameres, narrow, apex strongly triangular in form (Fig. 31); gonocoxae more elongate with rounded apices (Fig. 54).....................................  Gyrinus (Neogyrinus) guianus  Ochs, 1935
description: Published as part of Gustafson, Grey T. & Short, Andrew E. Z., 2017, Review of the whirligig beetle genus Gyrinus of Venezuela (Coleoptera: Gyrinidae), pp. 479-520 in Acta Entomologica Musei Nationalis Pragae 57 (2) on pages 514-516, DOI: 10.1515/aemnp-2017-0087, http://zenodo.org/record/10101344