Hydroglyphus pusillus, the Tiny Tiger

Hydroglyphus pusillus, copyright Udo Schmidt. Let’s take another visit to the world of diving beetles. Above is Hydroglyphus pusillus, one of the few representatives in northern Europe of a genus that otherwise includes close to ninety species spread through the Old World, primarily in the tropics. Hydroglyphus species are tiny diving beetles, only about two… Continue reading Hydroglyphus pusillus, the Tiny Tiger


Merizodus soledadinus, from Lebouvier et al. (2020). Belongs within: Conjunctae. The Merizodinae are a group of small ground beetles with a disjunct distribution in southern South America, southern Australasia and northeastern Asia (Roig-Juñent & Cicchino 2001). Characters (from Roig-Juñent & Cicchino 2001, as Zolini): Maxillary palpomere 3 plurisetose; elytron with apical plica, recurrent stria joined… Continue reading Merizodinae

Dealing with a Clingy Male

Diving beetles of the family Dytiscidae are a distinctive component of the freshwater environment in most regions of the world. They have an oval, streamlined body form and powerful hind legs, usually with fringes of stiff setae, that are ill-suited for movement on land but make them adept swimmers. They are also almost always capable… Continue reading Dealing with a Clingy Male

The Trechodini

The above figure, from Uéno (1990), shows Trechodes satoi, a fairly typical representative of the carabid ground beetle tribe Trechodini. Members of this tribe are found in many parts of the world, though they are absent from the Nearctic region and were unknown from northern Asia prior to the description of Eotrechodes larisae from the… Continue reading The Trechodini

Boreonectes: Diversity Hidden Underwater

The beetle in the photo below (copyright Joakim Pansar) may or may not be Boreonectes griseostriatus. This small diving beetle, a few millimetres in length, has been regarded in the past as widespread with a distribution spanning the Holarctic region. However, in recent years it has become apparent that this single widespread species may actually… Continue reading Boreonectes: Diversity Hidden Underwater

Megacephala (Pseudotetracha)

Female Megacephala blackburni, from Mal et al. (2012). Belongs within: Cicindelinae. The subgenus Pseudotetracha of the genus Megacephala is a group of bright metallic-coloured tiger beetles found on Australian salt flats. <==Megacephala (Pseudotetracha Fleutiaux 1894) G07     |–M. (*P.) cylindrica Macleay 1863 [incl. M. frenchi Sloane 1893] LM87     |–M. (P.) australis (Chaudoir 1865) G07 [=Tetracha australis… Continue reading Megacephala (Pseudotetracha)

Cicindela (Rivacindela)

Rivacindela vannidekiana, copyright Mark Golding. Belongs within: Cicindelinae. The subgenus Rivacindela of the genus Cicindela is a group of tiger beetles found on Australian salt flats, characterised by the presence of two or three teeth on the labrum and usually with extensive patches of white on the elytra. <==Cicindela (Rivacindela Brouerius van Nidek 1973) LM87… Continue reading Cicindela (Rivacindela)

Cicindela (Myriochile)

Cicindela semicincta, copyright Victor W. Fazio III. Belongs within: Cicindelinae. The subgenus Myriochile of the genus Cicindela is a group of tiger beetles with completely metallic-coloured legs bearing hooked setae along the posterior margin, and moderately abundant appressed setae on the venter of the body. <==Cicindela (Myriochile Motschulsky 1861) [=Myriochila (l. c.)] LM87     |–‘Myriochile’ melancholica… Continue reading Cicindela (Myriochile)


Apotomus rufus, copyright elleelle. Belongs within: Conjunctae. Contains: Broscini. The Broscinae are a group of ground beetles characterised by a pedunculate connection between the pro- and mesothorax, and a single supraorbital seta. Members of the genus Apotomus, which have elongate palps and an unmargined prothorax, are found on mudflats adjacent to rivers (Bouchard 2014). <==Broscinae… Continue reading Broscinae


Promecoderus viridiaeneus, copyright Lynne Forster. Belongs within: Broscini. Promecoderus is an Australian genus of broscin ground beetles characterised by the presence of a median tooth on the mentum. <==Promecoderus Dejean 1829 [incl. Acallistus Sharp 1886, Anheterus Putzeys 1868, Cnemacanthus Gray 1832] LM87     |–*P. brunnicornis Dejean 1829 [incl. P. degener Guérin-Méneville 1841, P. morosus Putzeys 1868]… Continue reading Promecoderus