Dictyogenus padanum Reding 2024, sp. n.
Creators: name: Reding, Jean-Paul G.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlodidae
Dictyogenus
Dictyogenus padanum

description: 2.5 Dictyogenus padanum sp. n.
urn:lsid:zoobank.org:act:A6A3E933-6F99-4555-BE7B-EBA0A11D2F0E (Figs. H.1–H.15)
Dictyogenus fontium Consiglio 1967:44; 1980:14; Ravizza & Ravizza Dematteis 1990:330; Aubert et al. 1996:15; Fochetti & Tierno de Figueroa 2008:62; Lubini et al. 2012:212; Fochetti 2020:382; Roesti 2021:138
Adults. Body length of males 15–22 mm (n = 66); females 16–29 mm (n = 43). Adult males and females of D. padanum sp. n. have both macropterous and brachypterous populations, often occurring syntopically. Head mostly yellow (Fig. H.1); M-line not well-marked (Fig. H.1). Interocellar yellow patch wide, continuous with the median yellow band on the pronotum (Fig. H.1). Yellow median band on pronotum widening in its posterior margin (Fig. H.1). Side of the pronotum with sculpted rugosities (Fig. H.1). Abdominal sterna pale brown, laterally with symmetrical, dark patches (Fig. H.7). Proximal part of tibiae with a dark band. Antennae and cerci blackish to dark brown.
Male terminalia. Tip of epiproct straight, slightly bent down (Figs. H.2–H.5). Lateral stylets cudgel-shaped, symmetrically widening at apex (Figs. H.2–H.5; Fochetti & Tierno de Figueroa 2008: 62, 64, sub nom. D. fontium). Hemitergal lobes long and slender (Fig. H.6).
Morphological affinities. Specimens of D. padanum sp. n. differ from topotypical D. fontium and from D. nadigi sp. n. by the lateral stylets of their adult males, which bulge out symmetrically at their apex (Figs. H.2–H.5), whereas they are convex (Figs. C.2–C. 4) or straight (Figs. G.2, G. 3) on their distal side in the two other species.
Females. Subgenital plate short, with (Fig. H.7) or without median notch on its distal edge.
Mature nymphs. Length 13–28 mm (n = 36). Mature male and female nymphs with prefigured macropterism or brachypterism. No dimorphic setation is seen between macropterous male and macropterous female nymphs, and also no dimorphic setation between brachypterous male and brachypterous female nymphs. No tuft of flexible mediodorsal occipital setae; only stiff mediodorsal occipital setae (Fig. H.8). No setae on pro-, meso- and metanotum of macropterous and brachypterous male or female nymphs (Figs. H.8–H.11; Fochetti & Tierno de Figueroa 2008, sub nom. D. fontium). Abdominal tergites of macropterous male and female nymphs without mediodorsal flexible setae (Figs. H.12, H.13). Intersegmental stiff setae on abdominal tergites are very short and sparse on the first segments, and with only 4–6 on segments VII–X (Figs. H.12, H.13). Paraprocts, in ventral view, with 0–3 spines, unevenly distributed between left and right (Figs. H.14, H.15), and limited to the distal half. Mediodorsal setae on base of cerci very short and sparse. Stipe with numerous spines distributed in a single row.
Morphological affinities. Nymphs of D. padanum sp. n., females and males, macropterous and brachypterous, lack setae on the pro-, meso- and metanotum. This separates them from the topotypical specimens of D. fontium and D. nadigi sp. n., whose brachypterous male and female specimens have setae on their meso- and metanotum, as well as mediodorsal flexible setae on abdominal tergites.
Type material. SWITZERLAND. Canton of Valais. Gabi-Gstein, lower Chrummbach (Diveria), 1250 m, 46° 11’ 07.89” N, 8° 04’ 17.23” E, 19.6.2018, 1♁, leg. G. Vinçon (holotype, MZL, GBIFCH01217065); 4♁b, 2♀ b, leg. G. Vinçon (paratypes, MZL, GBIFCH01217067). ITALY. Ingria, Soana tributary, 1200 m, 45° 27’ 29.82” N, 7° 33’ 31.89” E, 24.6.2018, 1♁, 2♁b, 1♀ b, leg. G. Vinçon (paratypes, MZL, GBIFCH01217066); Oropa Valley, Sanctuario, Orsuccio tributary, 1800 m, 45° 40’ 21.2448” N, 7° 56’ 26.2068” E, 4.7.2020, 2♁, 3♀, leg. G. Vinçon (paratypes, MZL, GBIFCH01217064); Oropa valley, Fenereccio, Furia, 1300 m, 45° 37’ 03.0144” N, 7° 58’ 36.9876” E, 5.6.1978, 1♁ (epiproct in separate vial), leg C. Ravizza (paratypes, MZL, GBIFCH01217071, in: CB-18640, GBIFCH00899349).
Other material. ITALY. Alpe piane, Cervarolo, 1220m, 45° 51’ 59.058” N, 8° 15’ 40.7988” E, 1.6.1991, 2♀, 3E, leg. G. Vinçon (RED); Champdepraz, Gran Lago tributary, 2528 m, 45° 38’ 39.1128” N, 7° 33’ 14.562” E, 12.7.2003, 3♀, leg. G. Vinçon (RED); Campello Monti, Gravellona, 1750 m, 45° 56’ 18.56” N, 8° 14’ 11.28” E, 11.7.2003, 1♀; 19.6.2018, 2♁, 4♁b, 1L ♀, leg. G. Vinçon (VIN); Ingria, Soana tributary, 1300 m, 45° 27’ 43.24” N, 7° 33’ 14.09” E, 30.6.2016, 3♁b, leg. G. Vinçon (VIN); Fondo, Burdeiver, 1300 m, 45° 31’ 52.35” N, 7° 41’ 05.03” E, 7.6.2013, 1L♀, 4L♀b; 21.6.2014, 2♁, 1♁b, 1♀, 1L ♀ b; 31.7.2015, 3♀ b, 1L ♀ b, leg. W. Graf (GRA); Traversella, Burdeiver tributary, 2160 m, 45° 31’ 05.52” N, 7° 38’ 41.28” E, 12.7.2012, 3♁b, 1♀ b, leg. G. Vinçon (VIN); Vallone di Nana, torrente di Nana, 2500 m, 45° 51’ 34.596” N, 7° 41’ 36.384” E, 19.7.2003, 2♁, leg. G. Vinçon (VIN); Colla del Colombardo, Borgialetto, spring, 1448 m, 45° 12’ 05.8068” N, 7° 18’ 53.2548” E, 20.6.2019, 6♁b, 2♀, leg. G. Vinçon (VIN); Valprato Soana, Piamprato, 1580 m, 45° 33’ 28.01” N, 7° 34’ 10.92” E, 11.7.2008, 1♁, 2♀, leg G. Delmastro (VIN); Alpette, spring, 1250 m, 45° 23’ 59.4636” N, 7° 34’ 24.3912” E, 7.8.2019, 4♁b, 3♀ b, leg. G. Vinçon (VIN); Oropa valley, Fenereccio, Furia, 1300 m, 45° 37’ 03.0144” N, 7° 58’ 36.9876” E, 13.7.1987, 10L, leg C. Ravizza (MZL, CB-18640, GBIFCH00899363); 5.6.1978, 10♁, 10♀, leg C. Ravizza (MZL, CB-18640, GBIFCH00899349); Civiasco, Pascone, 1200 m, 45° 49’ 07.3956” N, 8° 17’ 25.6236” E, 2.6.1991, 2♁, leg. G. Vinçon (VIN); Locana, Piantonetto, 1710 m, 45° 28’ 36.5484” N, 7° 22’ 21.2016” E, 9.9.2008, 3♀, leg. G. Vinçon (VIN); Frudiere, spring, 2050 m, 45° 43’ 54.174” N, 7° 49’ 0.0732” E, 13.7.2003, 1♁b, 2♀ b, leg. G. Vinçon (VIN); Valpelline, Bionaz, 1650 m, 45° 54’ 27.2484” N, 7° 30’ 5.6124” E, 8.8.1977, 1♁b, 6L, leg. C. Ravizza (MZL, CB-18641, GBIFCH00899360). SWITZERLAND. Gabi-Gstein, lower Chrummbach (Diveria), 1250 m, 46° 11’ 07.89” N, 8° 04’ 17.23” E, 19.6.2018, 5♁b, 2♀ b, 2L ♀ b, 1E, leg. G. Vinçon (VIN); Gabi-Gstein, upper Chrummbach (Diveria), 2200 m, 46° 11’ 13.488” N, 8° 02’ 39.822” E, 13.6.2018, 1♁, 1♀, leg. G. Vinçon (VIN); Innri Alpa, Alpjerbach, 2140 m, 46° 13’ 13.674” N, 8° 05’ 42.4356” E, 23.8.2019, 2♁b, 2♀, 1♀ b, leg. G. Vinçon (VIN); Rotelsee, Chrummbach (Diveria), 2025 m, 46° 14’ 44.6172” N, 8° 01’ 56.2548” E, 16.7.2004, 1♁, 1L♁, leg. P. Stucki (MZL, CB-13265). Canton of Ticino. Giona 24 (Aubert et al. 1996), brooklet near Alpe di Neggia, 1281 m, 46° 06’ 27.2016” N, 8° 50’ 35.664” E, 21.5.1988, 1L♁b, 1L ♀ b, leg. J. Aubert (MZL, CB-13264); 18.7.1988, 2♁, leg. J. Aubert (MZL, CB-13265); 22.4.2005, 1L ♀, 1L ♀ b, leg. H. Vicentini (MZL, CB-13264); Alla Ca, Ticino tributary, 2300 m, 46° 28’ 41.749” N, 8° 24’ 13.8735” E, 20.7.2007, 2♀, leg. W. Graf (GRA); San Bernardino, Moesa tributary, 1610 m, 46° 27’ 27.3096” N, 9° 11’ 43.3032” E, 22.5.1988, 1L ♀, leg. J. Aubert (MZL, CB-13264); unnamed brook, Rii, 1200 m, 46° 06’ 18.3024” N, 8° 50’ 21.9336” E, 16.9.1985, 1L♁b, leg. J. Aubert (MZL, CB-13264); Colla, Corticella, 980 m, 46° 05’ 51.0684” N, 9° 02’ 54.8592” E, 11.4.1986, 1L ♀ b, leg. J. Aubert (MZL, CB-13264); San Carlo, Lake Ritom tributary, 1860 m, 46° 32’ 47.886” N, 8° 42’ 7.3872” E, 11.4.1986, 3L ♀ b, leg. V. Lubini (MZL, CB-16956, GBIFCH01210790)
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Distribution and ecology. Widely distributed in the Italian and the southern Swiss Alps: Ticino (Aubert et al.
1996), Piedmont, Aosta Valley, and Oropa Valley (Ravizza & Ravizza Dematteis 1990), and Simplon (Figs. J.2, J. 3).
The species occurs in high-altitude brooks and springs, from 1200 m to 2500 m.
Adult flight period. June to September.
Derivatio nominis. Named after the Po drainage basin, whose spring brooks are inhabited by the species. The adjective padanum is to be treated as a neuter Latin adjective in the nominative case combined with Dictyogenus.
description: Published as part of Reding, Jean-Paul G., 2024, Notes on the genus Dictyogenus Klapálek, 1904 (Plecoptera, Perlodidae) in the Austrian, Italian, Slovenian and Swiss Alps, with the description of six new species, pp. 151-194 in Zootaxa 5397 (2) on pages 181-185, DOI: 10.11646/zootaxa.5397.2.1, http://zenodo.org/record/10468561