Hydraena

Perkins, Philip D., 2011, New records and description of fifty-four new species of aquatic beetles in the genus Hydraena Kugelann from South America (Coleoptera: Hydraenidae), Zootaxa 3074, pp. 1-198 : 13

publication ID

https://doi.org/ 10.5281/zenodo.1050060

DOI

https://doi.org/10.5281/zenodo.6184398

persistent identifier

https://treatment.plazi.org/id/C063786A-FFA2-FFF1-FF0D-13BD5ABA90CC

treatment provided by

Plazi

scientific name

Hydraena
status

 

Key to Groups of New World Hydraena View in CoL

1 Posterior ridge of genae present, at least laterally (e.g., Figs. 2 View FIGURE 2 c, 2d); abdominal intercoxal ventrite various; scintilla absent ... 2

1' Posterior ridge of genae absent (e.g., Figs. 44 View FIGURE 44 , 126 View FIGURE 126 ) or nearly imperceptible; abdominal intercoxal ventrite flat, with posterior margin straight or weakly arcuate; scintilla ( Fig. 2 View FIGURE 2 b) present or absent........................................... 5

2 Elytra and labrum with spines ( Figs. 21 View FIGURE 21 , 22 View FIGURE 22 ); elytron with five rows of punctures between suture and humerous; two species from South America...................................................................... Multispina View in CoL Group

2' Elytra and labrum without spines; elytron with more than five rows, or with many random punctures................... 3

3 Abdominal intercoxal ventrite concave, with posterior margin markedly arcuate; elytral punctures serial or, in few adults, with few random punctures on disc; spermatheca C-shaped; female gonocoxite not divided; Canada and the United States............................................................................................... Circulata Group

3' Abdominal intercoxal ventrite flat, with posterior margin straight or weakly arcuate; elytral punctures random, at least near base; spermatheca disc-shaped (e.g. Figs. 151–154 View FIGURES 151 – 154 ) or (in H. paeminosa View in CoL ) trilobed ( Fig. 155); female gonocoxite divided ( Figs. 148–150 View FIGURES 148 – 150 ); South America.............................................................................. 4

4. Elytral punctures coarse and very random (e.g., Fig. 3 View FIGURE 3 ); pronotum more elongate; mesoventral intercoxal process (P2) very narrow, tapering to sharp point that is contiguous with midlongitudinal carina of metaventrite (e.g., Fig. 2 View FIGURE 2 c).................................................................................................... Paeminosa View in CoL Group

4'. Elytral punctures serial except in small area at base ( Figs. 16–18 View FIGURE 16 View FIGURE 17 View FIGURE 18 ); pronotum less elongate, sides more sinuate; mesoventral intercoxal process (P2) wide, apex blunt (e.g., Fig. 2 View FIGURE 2 d)............................................ Curvosa View in CoL Group

5 Pronotal scintilla ( Fig. 2 View FIGURE 2 b) present or absent; pronotum always with posteromedial foveae (PF2; Fig. 2 View FIGURE 2 a)...... Leechi Group

5' Pronotum never with scintilla; pronotum without posteromedial foveae, or if present very shallow and pronotum coarsely punctate (e.g., Figs. 110 View FIGURE 110 , 118 View FIGURE 118 )........................................................... Marginicollis Group

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydraenidae

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