Procloeon Bengtsson 1915

Kluge, Nikita J., 2025, Contribution to the knowledge of psammophylous representatives of Procloeon Bengtsson 1915 - Psammonella Glazaczow 1987 and Pseudocentroptiloides Jacob 1987 (Ephemeroptera: Baetidae), Zootaxa 5691 (3), pp. 449-494 : 451

publication ID	https://doi.org/10.11646/zootaxa.5691.3.3
publication LSID	lsid:zoobank.org:pub:7D944AD3-0FA0-4549-AEB1-CF3F0348D1A0
persistent identifier	https://treatment.plazi.org/id/039187C0-FFD3-FFF2-83CF-FE7D366F6584
treatment provided by	Plazi
scientific name	Procloeon Bengtsson 1915
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Treatment

Genus Procloeon Bengtsson 1915 View in CoL View at ENA (s. l.), or Procloeon /g1

( Figs 1–219 View FIGURES 1–8 View FIGURES 9–24 View FIGURES 25–28 View FIGURES 29–31 View FIGURES 32–59 View FIGURES 60–66 View FIGURES 67–73 View FIGURES 74–79 View FIGURES 80–83 View FIGURES 84–88 View FIGURES 89–93 View FIGURES 94–97 View FIGURES 98–102 View FIGURES 103–108 View FIGURES 109 View FIGURES 110–116 View FIGURES 117–122 View FIGURES 123–131 View FIGURES 132–135 View FIGURES 136–143 View FIGURES 144–150 View FIGURES 151–154 View FIGURES 155–158 View FIGURES 159–164 View FIGURES 165–173 View FIGURES 174–180 View FIGURES 181–189 View FIGURES 190–197 View FIGURES 198–203 View FIGURES 204–206 View FIGURES 207–212 View FIGURES 213–216 View FIGURES 217–219 )

In circumscription corresponds to:

—branch «11»: Kluge & Novikova 1992: fig. 11;

— Procloeon View in CoL /g1: Kluge 2012: 362;

—genus Procloeon View in CoL : Kluge 2016: 494.

Type species: Cloeon bifidum Bengtsson 1912 .

Systematic position of Procloeon View in CoL . The taxon Procloeon View in CoL , or Procloeon View in CoL /g1 belongs to the higher taxon Cloeon View in CoL / fg1 (as defined by Kluge 2012), which can be treated as the tribe Cloeonini (as defined by Kluge 2016). Diagnosis and composition of Cloeon View in CoL /fg1 = Cloeonini is given in the previous publications ( Kluge & Novikova 1992: branch «6» on figure 11; Kluge 2016: 492).

Diagnosis. The taxon Procloeon s. l. is characterized by peculiar structure of the denticles located on distal margins of segments of larval cerci: in distal part of cercus, each cercomere has one greatly enlarged denticle located on its lateral side; this denticle is much larger than others, usually longer than the next cercomere and is usually widened ( Kluge & Novikova 1992: fig. 9. 19) ( Kluge 2012: 362; 2016: 494). Such structure of larval cerci occurs in all examined representatives if the plesiomorphon Procloeon s. str. ( Figs 2–8 View FIGURES 1–8 ; Kluge & Novikova 1992: fig. 9. 19), the examined representative of the subgenus Pseudocentroptiloides s. str. ( Fig. 1 View FIGURES 1–8 ), in both representatives of the subgenus Monilistylus Kluge 2020a ( Kluge et al. 2014: figs 1–3; Kluge 2020a: figs 7–8), in all representatives of the subgenus Oculogaster Kluge 2016 ( Kluge 2016: figs 21–22, 59–60; Kluge 2020b: figs 8–9, 43–44, 85–86, 112, 141); in all examined representatives of the subgenus Securiops Jacobus et al. 2006 ( Kluge 2023: figs 71–72, 105, 124–125) and in all examined representatives of the subgenus Psammonella described in this paper ( Figs 86–88 View FIGURES 84–88 , 129–130 View FIGURES 123–131 , 156 View FIGURES 155–158 , 189 View FIGURES 181–189 ). In most of these species, the enlarged denticle is longer than the next cercomere, in certain species up to three times longer ( Kluge 2023: fig. 125); in exceptional case the denticle is a little shorter than the next cercomere ( Kluge et al. 2014: fig. 3). The enlarged denticle is usually widened, with convex margins, so that in dorsal and ventral views its width at midlength exceeds its width at base ( Figs 130 View FIGURES 123–131 , 156 View FIGURES 155–158 , 189 View FIGURES 181–189 ); in some species these denticles are not widened, with margins straight ( Fig. 86 View FIGURES 84–88 ).