Pseudorygmodus versicolor, FIKÁýEK & VONDRÁýEK, 2014

FIKÁýEK, Martin & VONDRÁýEK, Dominik, 2014, A review of Pseudorygmodus (Coleoptera: Hydrophilidae), with notes on the classification of the Anacaenini and on distribution of genera endemic to southern South America, Acta Entomologica Musei Nationalis Pragae 54 (2), pp. 479-514 : 498-499

Pseudorygmodus versicolor sp. nov.

( Figs 5–7 , 12–30, 33, 35 , 41–42, 45, 48 , 51–52, 55–56, 58, 60–61 , 74 )

Type locality. Chile, La Araucanía Region, Parque Nacional Nahuelbuta, 2.2 km north of Pehuenco, Estero Agua de Los Gringos stream at the place where it is crossed by Sendero Estero Los Gringos track, 37°48.5މS 73°0.7މW, 1160 m a.s.l.

Type material. HOLOTYPE: J( MNNC), ‘ CHILE: IX.La Araucanía Region / PN Nahuelbuta, 2.2 km N of / Pehuenco, Estero Agua de Los / Gringos, 37°48.5މS 73°0.7މW / 1160m, 11–12.xii.2013 / FikáÞek, Kment & VondráÞek / CH 37 // floated from mosses at water / level or in the splash zone at / stones at sides and in the middle / of a mountain stream’. PARATYPES: 29 spec. ( NMPC, BMNH, FMNH, JBCC, MNNC, SEMC, USNM, ZMUC): same label data as the holotype.

Description. Body. Body elongate oval, moderately convex. Body length 3.2–4.1 mm (3.4 mm in the holotype), body width 1.9–2.3 mm (2.0 mm in the holotype). Coloration. Dorsal surface very dark brown to black, elytra with weak bluish metallic sheen; lateral parts of pronotum widely yellow and rather sharply de¿ned from dark pronotal disc; lateral margin of elytra with a narrow yellow stripe which is rather sharply de¿ned anteriorly but rather vaguely posteriorly, epipleuron yellow. Ventral portion of head black, mouthparts brown; prosternum brown, prothoracic hypomeron yellowish; ventral portions of meso- and metathorax dark brown, abdominal ventrites brown to dark brown. Head appendages yellowish proximally, brown to dark brown distally; femora reddish, tibiae and tarsi slightly darker, brown. Head. Frons and clypeus with ¿ne but sharply impressed rather sparse punctation, interstices without miscrosculpture. Eyes weakly protruding, separated by ca. 5.3× the width of one eye. Labrum with punctation similar to that on clypeus, bearing a transverse series of few trichobothria with sockets larger than surrounding punctation. Maxillary palpi not widened, of same morphology in male and female. Posterior tentorial pits fused together.

Thorax. Pronotum with punctation similar to that on head, interstices without microsculpture. Elytral series rather indistinct anteromesally, more distinct posteriorly and laterally; interval punctation ¿ne, rather sparse but sharply impressed, punctures only slightly smaller than serial ones; interstices without microsculpture. Prosternum with nearly complete transverse ridge. Mesoventrite nearly flat, only with slightly elevated posteromedian portion, bearing a longitudinal impression anteromedially, anteriorly dividing the posterior portion of the mesothoracic collar. Metaventrite with dense hydrofuge pubescence except posteromesally and anterior of metacoxae; postcoxal ridge of metaventrite straight, not crenulate.

Abdomen. Abdominal ventrites completely covered by dense pubescence. Legs. Metafemur and metatibia of the same morphology in male and female; femur slender, subcylindrical, without tibial groove, tibia subcylindrical; claws not sexually dimorphic, arcuate in both sexes. Male genitalia. Aedeagus with parameres widened apically (chopper-like); median lobe widely triangular, gonopore narrowly transverse.

Etymology. The species name versicolor (Latin, colorful) reflects the dorsal coloration of this species, combining yellow, black and metallic bluish, in which it differs from P. flintispangleri .

Biology. All specimens were floated from the wet moss collected on stones in and along the mountain stream, in the splash zone just above the water-line ( Figs 8–10 ). They co-occurred in this habitat with Anticura flinti Spangler, 1979 and Enochrus (Hugoscottia) variegatus (Steinheil, 1869) (small male specimen corresponding with those from Argentina: Junín de Los Andes identi¿ed by L. Fernández, all specimens deposited in NMPC).

Distribution. Only known from the type locality in Parque Nacional Nahuelbuta.

Figures

Figs 1–7. Habitus of the species of Pseudorygmodus Hansen, 1999. 1–3 – P.flintispangleri (Moroni, 1985), male from Magellanes: Fiordo Eyre (1 – dorsal, 2 – lateral, 3 – frontal); 4 – same species, female from PN Puyehue. 5–7 – P.versicolor sp. nov., female from PN Nahuelbuta, Estero Agua de los Gringos (5 – dorsal, 6 – lateral, 7 – frontal).

Figs 12–17. Pseudorygmodus versicolor sp. nov., slide-mounted male paratype: morphology of head appendages (12–16) and metathoracic wing (17). 12 – mandible, ventral view (detail = mandibular apex in ventromesal view); 13 – labrum, ventral view; 14 – maxilla, ventral view (detail = digitiform sensilla on base of palpomere 4); 15 – mentum and prementum, ventral view (detail = labial palp); 16 – antenna; 17 – wing.

Figs. 18–29. Morphology of Pseudorygmodus versicolor sp. nov., slide-mounted male paratype. 18 – meso- and metathorax, ventral view; 19 – detail of metatrochanter; 20 – mesofurca; 21 – half of prothorax in ventral view; 22 – mesoscutellum, dorsal view; 23 – metafurca; 24 – elytron, ventral view; 25 – abdominal ventrites, ventral view; 26 – detail of posterior margin of abdominal ventrite 5; 27 – mesotarsus; 28 – metatarsus; 29 – protarsal claw. Not to scale.

Figs 30–38. Morphology of Pseudorygmodus Hansen, 1999, SEM micrographs. 30, 33, 35 – P. versicolor sp. nov.; 31–32, 34, 36–38 – P.flintispangleri (Moroni, 1985), male. 30 – ventral morphology; 31 – detail of antenna and male maxillary palpus, ventral view; 32 – maxillary palpomeres 3–4 in dorsal view, with digitiform sensilla; 33 – maxillary palpomere 4 in dorsal view, with digitiform sensilla; 34 – punctation of frons next to eyes; 35 – head and prothorax in ventral view; 36 – head in ventral view; 37–38 – prosternum.

Figs. 39–48. Ventral morphology of Pseudorygmodus Hansen, 1999, SEM micrographs. 39–40, 43–44, 46–47 – P. flintispangleri (Moroni,. 1985), male; 41–42, 45, 48 – P. versicolor sp. nov. 39, 41 – mesoventrite; 40, 42 – meso- and metaventrite; 43 – male metafemur and metatibia; 44–45 – detail of epipleuron; 46 – detail of pronotum; 47–48 – detail of abdominal ventrites.

Figs 49–61. Morphological details of adults of Pseudorygmodus Hansen, 1999. 49–52 – maxillary palpus, ventral view (49 – P.flintispangleri (Moroni, 1985), male; 50 – P.flintispangleri, female; 51 – P. versicolor sp. nov., male; 52 – P. versicolor, female). 53–56 – metatibia, ventral view (53 – P. flintispangleri, male; 54 – P.flintispangleri, female; 55 – P. versicolor, male; 56 – P. versicolor, female). 57–58 – labrum, dorsal view (57 – P.flintispangleri, 58 – P. versicolor). 59 – aedeagus of P. flintispangleri. 60–61 – male genitalia of P. versicolor (60 – aedeagus, 61 – sternite 9).

Fig. 74. Potential distribution (green) of the ¿ve hydrophilid genera endemic to southern South America. The southernmost record of Pseudorygmodus flintispangleri (Moroni, 1985) was not used for the analysis, but is shown here to provide complete data on known distribution of the species.

Figs 8–11. Habitats of Pseudorygmodus species.8–10 – type locality and habitat of P.versicolor sp. nov.(8 – general view of EsteroAgua de Los Gringos, PN Nahuelbuta, Chile.9–10 – details of microhabitat: wet mosses in the splash zone above the water level which were collected and from which the specimens were subsequently floated). 11 – M. J. Gunderson collecting P.flintispangleri (Moroni, 1985) at glacier margin on moraine at Fiordo Bernardo, Aysén Region, Chile, 4.ii.1985 (photo by A. C. Ashworth).