Eubrianax luteosignatus Pic, 1947

Shepard, William D. & Barr, Cheryl B., 2023, A revision of the Chilean water penny genus Tychepsephus Waterhouse, 1876 (Coleoptera, Psephenidae, Eubriinae), with description of a second species and two larval morphotypes, and notes on other Chilean Psephenidae, ZooKeys 1164, pp. 23-61 : 23

Eubrianax luteosignatus Pic, 1947

Fig. 24

Type locality.

“Chili”.

Material examined.

Holotype. Chile: "Chili // type // Eubrianax luteosignatus nsp // 314 // coll Germain [lavender label] // TYPE [red label]" (Fig. 24 ). Deposited in the MNHN.

Remarks.

Eubrianax is a Holarctic element that is not expected to occur in Chile. When the type of Eubrianax luteosignatus (Fig. 24 ) from the MNHN was examined, it was found to be very dirty and glued on a point with the ventral side obscured. We did not seek permission to clean and remount it so our observations were limited. However, it appears that the type actually belongs in the Eubriinae , rather than in the Eubrianacinae where Eubrianax is placed. The elytral markings are very reminiscent of the eubriine genus Dicranopselaphus which, in the New World, is known from the eastern USA south through Central America. Pic (1947) described Eubrianax luteosignatus in the Dascillidae .

Eubriinae : unknown genus and species of larvae (Chile)

We know of two larval specimens of an unknown genus and species of Eubriinae from Chile, one in the EMEC and one in the MNNC. The EMEC specimen (Fig. 25 ) is unfortunately in marginal condition. It was collected by Tomás Čekalović who lived near Concepción, Chile. The locality, Estero Nonguén, flows from Parque Nacional Nonguén through an urban area of Concepción. The other larva (Fig. 26 ), from the MNNC, is from Reserva Nacional Los Ruiles near the coast northwest of Cauquenas ( Elgueta and Guerrero 2005). These two specimens may be the larva of the species currently known as Eubrianax luteosignatus .

Eubriinae : unknown genus and species of larva (French Guiana)

One larva resembling Tychepsephus (larval morph 2) (Fig. 6 ) was collected in a stream in French Guiana (FRENCH GUIANA: Sinnamary, Carbet Mouche, Crique "Salle de Bains", 04.648440°N, 052.94082°W, elevation 37 m). If this actually is a species of Tychepsephus , it would represent a range extension of approximately 4500 km to the northeast of the known distribution of the genus in Chile. Verification would require collection of adult specimens.

Figures

Figure 24. Eubrianax luteosignatus, type specimen a dorsal habitus b specimen data labels. Images provided by Christophe Rivier (MNHN).

Figures 25, 26. Unknown eubriine larvae from Chile 25 specimen from Estero Nonguen, Concepcion a dorsal view b ventral view 26 specimen from Reserva Nacional Los Ruiles, northwest of Cauquenes a dorsal view b ventral view. Fig. 26 images provided by Mario Elgueta and Marcelo Guerrero (MNNC).

Figures 5, 6. Non-Chilean larvae 5 Tychepsephus larva from Argentina a dorsal view b ventral view. Images provided by Nicolas Roman (CONICET) 6 larva from French Guiana, possibly Tychepsephus a dorsal view b ventral view. Images provided by Robert Sites (UMC).