Gyrinus (Oreogyrinus) venezolensis Ochs, 1953

Gustafson, Grey T. & Short, Andrew E. Z., 2017, Review of the whirligig beetle genus Gyrinus of Venezuela (Coleoptera: Gyrinidae), Acta Entomologica Musei Nationalis Pragae 57 (2), pp. 479-520 : 505-508

publication ID

https://doi.org/ 10.1515/aemnp-2017-0087

publication LSID

lsid:zoobank.org:pub:EC4E5771-9B5E-4745-BB24-556963D657B7

DOI

https://doi.org/10.5281/zenodo.5414982

persistent identifier

https://treatment.plazi.org/id/03959737-FFEE-203B-116A-8BF9FF436917

treatment provided by

Marcus

scientific name

Gyrinus (Oreogyrinus) venezolensis Ochs, 1953
status

 

Gyrinus (Oreogyrinus) venezolensis Ochs, 1953

( Figs 33–34 View Figs 29–33 View Figs 33–38 , 39 View Figs 39–40 , 41 View Figs 41–42 , 43–44 View Figs 43–46 , 48 View Figs 47–50 , 58 View Figs 51–59 , 62–63, 72, 80)

Gyrinus (Oreogyrinus) venezolensis Ochs, 1953: 185 (original description).

Type locality. ‘ Venezuela Mérida’.

Type material examined. PARATYPES (4 spec. SMF): ‘J [white label, typed black ink]’ ‘ Merida [white label, typed black ink]’ ‘ Venezuela / Briceno [white label, typed black ink]’ ‘coll. / G.Ochs [white label, typed black ink]’ ‘Para- / typoid / SMF / C 9065 [red label, black border, typed black ink]’ ‘Senckenberg- / Museum / Frankfurt / Main [white label, typed black ink]’ ‘ Gyrinus / venezolensis / Paratype Ochs / J 1942 [white label, handwritten black ink, handwriting is Ochs’]’ ‘ venezolensis Ochs [white label, black border, handwritten black ink, handwriting is Ochs’]’. Card mounted ♀, same locality as previous except ‘Mus. Berlin don. 1942 [white label, black border, typed black ink] ’; paratype SMFC 9066 View Materials , andwithouthandwritten Ochsdet labels. Cardmounted J and ♀ ( Fig. 73 View Figs 72–75 ), ‘ DR Moritz / 1858 / Venezuela [beige label, typed black ink]’, paratypes SMFC 9068 View Materials , SMFC 9069 View Materials .

Other material examined. VENEZUELA: MÉRIDA: Rt. 4, 27 km N. of Mérida , 20.ii.1976, leg. CM. & O.S.Flint Jr. (20 spec. USNM) ; Bailadores , roadside stream, 8°14’27.94”N, 71°48’57.37”W, 15.i.2006, leg. A. E.Z. Short, mud / gravel stream, AS-06-032, SM0828873–SM0828878 (6 spec. SEMC) GoogleMaps ; Cascada de Bailadores , 8°14.393’N, 71°48.672’W, 1862 m, 18.vii.2009, leg. Sites, stream, VZ09-0718-02S / L-1092, SEMC0879873 View Materials SEMC0879874 View Materials (2 spec. SEMC) GoogleMaps ; ca. 4 km E Jaji , 8°34.574’N, 71°18.806’W, 1830 m, 16.i.2006, leg. A. E.Z. Short, Lagoon in pasture, AS-06-035, SM0827433–SM0827451, SM0827453–SM0827470, SM0827472–SM0827486 (52 spec. SEMC, MIZA, MALUZ) GoogleMaps .

Diagnosis. Body form ( Fig. 33 View Figs 29–33 ) oval, in lateral view strongly convex; pronotal disc with transverse crease strongly impressed, laterally with sparse wrinkles ( Fig. 39 View Figs 39–40 ); elytral disc of female with intervals I–IV non-reticulate inbasal half ( Fig. 43 View Figs 43–46 ), V–X strongly reticulate ( Fig. 44 View Figs 43–46 ), XI non-reticulate; female elytral striae VI–IX sulcate ( Fig. 41 View Figs 41–42 ); elytral lateral margin weakly interrupted before apex ( Fig. 41 View Figs 41–42 ); metanepisternal ostiole present; aedeagus ( Fig. 48 View Figs 47–50 ) with median lobe strongly parallel sided for 2/3 length, apex broad, weakly triangular or rounded; parameres truncate apically.

Gyrinus venezolensis ismostsimilar to G. vinolentus sp. nov. but canbe distinguished from it by being more evenly oval in dorsal habitus, having a less wrinkled pronotum (c.f. Figs 39 and 40 View Figs 39–40 ), and the elytral lateral margin weakly interrupted in its apical 1/5 by a swelling ( Fig. 41 View Figs 41–42 ), as opposed to being strongly interrupted by a relatively large swelling ( Fig. 42 View Figs 41–42 ). Females of G. venezolensis can further be distinguishedfrom G. vinolentus sp. nov. byhaving somewhat less reticulate elytra, with reticulation only being regularly present on intervals V–X, as opposed to G. vinolentus sp. nov in which intervals IV–X are normally reticulate (at least in basal half of intervals IV–V). The male aedeagus is the most reliable way to separate the two species, as in G. venezolensis the parameres are apically truncate, and the median lobe is strongly parallel sided in its apical 2/3, with a broad apex ( Fig. 48 View Figs 47–50 ), compared to G. vinolentus sp. nov. which has rounded apices to the parameres and the median lobe strongly constricted in its apical 1/3, with a rounded apex ( Fig. 49 View Figs 47–50 ). The female gonocoxae also differ strongly between the two species, being more elongate and less curved in G. venezolensis ( Fig. 58 View Figs 51–59 ) compared to the relatively shorter and more strongly curved gonocoxae of G. vinolentus sp. nov. ( Fig. 59 View Figs 51–59 ).

Redescription. Size. Female length = 5.0– 5.5 mm, width = 3.0– 3.5 mm, male length = 4.5–5.0 mm, width = 2.5–3.0 mm. Habitus. Body form evenly oval, attenuated anteriorly and posteriorly, widest point just posteriad of humeral region; in lateral view dorsoventrally strongly convex, greatest convexity posterior to scutellar region, evenly depressed anteriorly and posteriorly.

Coloration ( Figs 33–34 View Figs 29–33 View Figs 33–38 ). Dorsally, head, pronotum, elytra black, with blue reflections; laterally reflections bronzy yellow and green, especially in females whose elytral lateral reticulation appears strongly bronzy green. Venter overall darkly colored; mouthparts, ventral surfaceof antennalpedicel, hypomeron, elytral epipleuron, mesoventrite medially, mesocoxae, and ultimate abdominal ventrite lighter in color – reddish brown to darker orange yellow; legs yellow in color; remainder of venter dark brown to black.

Sculptureand structure. Pronotum of bothsexes with broad riffled lateralmargins ( Fig. 39 View Figs 39–40 ); pronotal disc laterally weakly wrinkled ( Fig. 39 View Figs 39–40 ), wrinkles present anteriorly and associated with pronotal transverse impressed line, wrinkles also present posteriorly near posterior margin of pronotum. Female elytra ( Figs 33 View Figs 29–33 and 41 View Figs 41–42 ) with striae I–IV non-sulcate, elytral striae V–IX strongly sulcate in basal 2/3 of elytron, stria X non-sulcate, stria XI strictly marginal. Female elytral disc with intervals I–IV normally non-reticulate ( Fig. 43 View Figs 43–46 ), always basally free of reticulation; interval Valways with reticulation present at least apically or in lateral half near stria V; intervals VI–X completely reticulate ( Fig. 44 View Figs 43–46 ), reticulation with impressed dense meshes, composed of scale-like sculpticells; interval XI free of reticulation. Male elytra ( Fig. 34 View Figs 33–38 ) with striae I–IV non-sulcate; V–VII weakly sulcate after humeral region for brief extant; VIII–IX sulcate in humeral region, ending before apical 1/3 of elytron; stria X non-sulcate; stria XI strictly marginal. Male elytral disc with intervals I–XI without reticulation. Elytra of both sexes withlateralmargins weakly interrupted interrupted inapical 1 /5 by minor swelling; elytral apex truncate to weakly rounded. Metanepisternal ostiole very small.

Malegenitalia ( Fig. 48 View Figs 47–50 ).Aedeagus withmedianlobe narrow, shorter than parameres, weakly attenuated after basal 1/3, strongly parallel sided in apical 2/3, apex broad, weakly triangular; in lateral view median lobe thick, strongly dorsally curved; parameres with apex strongly truncate. Female genitalia ( Fig. 58 View Figs 51–59 ). Gonocoxae elongate, mostly straight with curved lateral margins, apices relatively truncate, weakly emarginate laterally, with lateral angle distinct, left gonocoxal apex less emarginate laterally than right.

Variability. There isvariability in the extent of the female elytral reticulation. Few specimens examined had the reticulation absent on interval Vbasally, with the reticulation present only apically and onthe lateral half of the interval near stria V. Afew other specimens hadinterval IV with reticulation in its apical half. However, it was most common for the species to have elytral interval IV free of reticulation in its basal half, having reticulation at most apically, and with interval V completely reticulate.

Habitat. This species has been collected from both streams and lagoons (Figs 62–63).

Distribution. Known only from the southern Venezuelan Andes in Mérida ( Fig. 72 View Figs 72–75 ).

Discussion. While currently only known from Venezuela, given its distribution in the far southern Venezuelan Andes ( Fig. 72 View Figs 72–75 ), this species may also be found inthe Andes of northern Colombia.

SMF

Forschungsinstitut und Natur-Museum Senckenberg

SMFC

Forschungsinstitut und Natur-Museum Senckenberg

USNM

Smithsonian Institution, National Museum of Natural History

SEMC

University of Kansas - Biodiversity Institute

MIZA

Museo del Instituto de Zoologia Agricola Francisco Fernandez Yepez

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Gyrinidae

Genus

Gyrinus

Loc

Gyrinus (Oreogyrinus) venezolensis Ochs, 1953

Gustafson, Grey T. & Short, Andrew E. Z. 2017
2017
Loc

Gyrinus (Oreogyrinus) venezolensis

OCHS G. 1953: 185
1953
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