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. 2023 May 26:1164:23-61.
doi: 10.3897/zookeys.1164.103184. eCollection 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

William D Shepard  1 , Cheryl B Barr  1
Affiliations

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

William D Shepard et al. Zookeys. .

Abstract

The Chilean water penny genus Tychepsephus Waterhouse, 1876 is revised, with descriptions and photographic illustrations of life stages including two larval morphotypes, the pupa of one morphotype, and adults of two species. The pupa of Tychepsephus has not been reported previously. Tychepsephuscekalovicisp. nov. is described, and Ectopria (Chilectopria) grandis Pic, 1947, syn. nov. is proposed as a new synonym of Tychepsephusfelix Waterhouse, 1876, which is redescribed. Taxonomic treatment of the adults of both species includes images of the habitus of males and females, morphological variation, and male and female genitalia. Males and females are sexually dimorphic. Information on the habitat of Tychepsephus is provided and illustrated with photographs, and the known geographic distribution of the two species is mapped. The occurrence of Tychepsephus in Argentina is reported; therefore, the genus no longer can be considered endemic to Chile. The taxonomic status and geographic distribution in South America of other species of Psephenidae, particularly members of the subfamily Eubriinae, is reviewed.

Keywords: Aquatic beetles; South America; biology; distribution; habitat; life stages; neotropical; sexual dimorphism; synonym.

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Figures

Figures 1, 2.
Figures 1, 2.
Tychepsephus larvae 1morph 1 a dorsal view b ventral view 2morph 2 a dorsal view b ventral view.
Figures 3, 4.
Figures 3, 4.
Tychepsephus pupa and larval exuvium 3 pupa a dorsal view b ventral view 4 exuvium of last larval instar, ventral view.
Figures 5, 6.
Figures 5, 6.
Non-Chilean larvae 5Tychepsephus larva from Argentina a dorsal view b ventral view. Images provided by Nicolás Román (CONICET) 6 larva from French Guiana, possibly Tychepsephusa dorsal view b ventral view. Images provided by Robert Sites (UMC).
Figure 7.
Figure 7.
Map of Chile with enlarged section showing the geographic distribution of species-verified adult Tychepsephus specimens: T.cekalovici, yellow triangles; T.felix, violet squares; both species, red circles.
Figures 8–11.
Figures 8–11.
Tychepsephus habitat 8 Río Colegual, T.cekalovici type locality a stream with riffle-pool morphology flowing through a mixture of forest and pasture land b streamside shrubby vegetation, adult habitat 9 Río Contaco 10 stream at Puente El Avion 11 tributary Río Blanco.
Figure 12.
Figure 12.
Tychepsephusfelix, female type specimen a dorsal view b ventral view c specimen data labels. Images provided by Keita Matsumoto (NHMUK).
Figures 13, 14.
Figures 13, 14.
Tychepsephusfelix, male 13 habitus a dorsal view b ventral view; length 5.0 mm 14 aedeagus a dorsal view b lateral view c ventral view.
Figures 15, 16.
Figures 15, 16.
Tychepsephusfelix, female 15 habitus a dorsal view b ventral view; length 4.2 mm 16 ovipositor, dorsal view.
Figure 17.
Figure 17.
Chilectopriagrandis, female type specimen a dorsal view b lateral view c ventral view d specimen data labels. Images provided by Christophe Rivier (MNHN).
Figures 18, 19.
Figures 18, 19.
Tychepsephuscekalovici sp. nov., male 18 habitus a dorsal view b ventral view; length 3.2 mm 19 aedeagus a dorsal view b lateral view c ventral view.
Figure 20.
Figure 20.
Tychepsephuscekalovici sp. nov., male dorsal habitus showing color pattern variation a length 3.3 mm b length 3.5 mm c length 3.5 mm.
Figures 21–23.
Figures 21–23.
Tychepsephuscekalovici sp. nov., female 21 habitus a dorsal view b ventral view; length 4.4 mm 22 dorsal color pattern variation; length 4.3 mm 23 ovipositor, dorsal view.
Figure 24.
Figure 24.
Eubrianaxluteosignatus, type specimen a dorsal habitus b specimen data labels. Images provided by Christophe Rivier (MNHN).
Figures 25, 26.
Figures 25, 26.
Unknown eubriine larvae from Chile 25 specimen from Estero Nonguén, Concepción 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).
See this image and copyright information in PMC

References

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    1. Barr CB, Shepard WD. (2017) Eubriamesoamericana Barr and Shepard (Coleoptera: Psephenidae: Eubriinae), a new psephenid species from Central America with an enigmatic generic distribution. Coleopterists Bulletin 71(3): 437–444. 10.1649/0010-065X-71.3.437 - DOI
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    1. Brown HP. (1983) A Catalog of the Coleoptera of America North of Mexico. Family Psephenidae. United States Printing Office, Washington, D. C., 8 pp.

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