Evanesternum pulsatum
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Ordo: Coleoptera
Familia: Hydrophilidae
Genus: Evanesternum
Name
Evanesternum pulsatum d'Orchymont, 1937 – Wikispecies link – Pensoft Profile
- Evanesternum pulsatum Arriaga-Varela, Emmanuel, 2018, African Invertebrates 59: 5-8.
Materials Examined
Material examined. Paratype: 'Afrika-Natal, Pietermaritzburg, Fort Napier 1919. Eing. Nr.36. 1926 // Compare au type: + collze +: 1.55 x 0.82 m // A. d'Orchymont det. Cercyon s. str. pulsatus paratype // Paratype' (1: RBINS); Voucher specimens: Republic of South Africa, Western Cape: 'R. SOUTH AFRICA: W. Cape 6.3 km W Suurbraak; Summerset Getaway Farm at river-bank; 34°0.01'S20°35.18'E; 110 m a.s.l.; 28.xi-2.xii.2015; Arriaga, Fikacek, Seidel & Vondracek lgt. RSA30a / in cow and horse dung in a farmland' (85 specimens: BCPC, BMNH, CNIN, FSCA, KMNH, NHMW, NMPC, SANC, TMSA, ZMUC); Eastern Cape: 'South Africa: Eastern Cape, Amathole District, Nxuba l.m. road to Fort Fordyce Nat Res. ex Excrement, 4-6.i.2015, 32.6906°S, 26.5031°E, P. Sipek & P. Malec' (1 male: NMPC) [DNA voucher MF1243]. Democratic Republic of Congo 'Congo Belge: Eala, V.1935, n°527 Sour excrements d'elephant, J. Ghesquiere' (1 male: RBINS); 'Foret de Kawa, 23.IV.29, A. Collart // A. d'Orchymont Cercyon pulsatus ' (3: RBINS).
Description
Description. Body. (Figs 1a-b, 3) 1.22-1.65 mm long; long oval, 1.9-2.0x as long as wide, widest at basal fourth of elytra; moderately convex, 3.0-3.1x as long as high. Integument dull, very weakly shining. Colouration of elytra light-brown, with mouth-parts and legs dark reddish-brown and ventral surfaces black. Vestiture composed of minute decumbent setae. Prothorax. Pronotum transverse, widest at base 1.9x wider than long; 1.45-1.50x wider at base than between anterior angles, 1.8x wider than head including eyes, as convex as elytra in lateral view. Prosternum weakly tectiform medially with anterior margin not thickened or projected ventrally (Fig. 4c). Antennal grooves distinct, weakly curved, open posteriorly (Fig. 3). Mesothorax. Scutellar shield about 1.7x as long as wide, moderately densely punctured. Elytra widest at anterior fifth, 2.55-2.64x as long as pronotum, 1.1x as wide as pronotum, punctation composed of crescent-shaped setiferous punctures, larger on the longitudinal series; setiferous punctures present on all intervals (Fig. 4f). Surface between punctures micropunctate. Humeral bulge indistinct. Mesoventral plate semi-elliptical, abruptly vanished in anterior half leaving only a narrow median ridge (Fig. 4g). Metathorax. Metaventrite (Fig. 4h) with raised area very wide, almost reaching lateral margins, about 1.5x as wide as long, rather roughly punctate, punctures transverse, resembling those on dorsal surfaces, with very small fine setae, surface finely squamose. Legs. Tibiae robust, with moderately large spines. Metatibiae flattened and short, straight, 0.26-0.28x as long as elytron, 2.9-3.2x as long as wide (Fig. 3). Metatarsi moderately long, 0.85-0.90x as long as metatibiae, with short and stout setae ventrally. Abdomen with five ventrites. Ventrite 1 with median longitudinal carina present, slightly narrowing posteriad, briefly projecting posteriorly in both sexes (Fig. 4i); ventrite 5 with rounded apex in both sexes, with a group of longer setae on apex. Genitalia. Median projection of sternite 9 (Fig. 1f) subtruncate apically, without subapical setae, median portion narrowing posteriorly, with posterior end distinctly acute, lateral struts joined at mid length of the median projection. Phallobase (Fig. 1c) slightly longer than parameres, asymmetrically narrowing basally, base slightly curved. Parameres weakly narrowing apically, subsinuate and briefly widened near apex. Median lobe (Fig. 1d) narrow, parallel-sided throughout, apex acuminate, with small parallel apical projection, gonopore moderately large, situated subapically.
Distribution
Distribution. Known from southern Africa (Republic of South Africa: Eastern Cape, Western Cape, KwaZulu-Natal) and central Africa (Democratic Republic of Congo) (Fig. 5a).
Biology and Ecology
Biology. Recently collected specimens from Western Cape were extracted from cow and horse dung in a small farm close to a river (Fig. 5b). Other hydrophilids from the same dung collected in abundance were Sphaeridium caffrum Castelnau, S. abbreviatum Boheman, Pachysternum capense (Mulsant) and three small Cercyon species (one belonging to the Cercyon nigriceps group and other two unidentified species). Other specimens examined were collected in unspecified type of dung while specimens from the Democratic Republic of Congo were collected from elephant excrement.Key to the Megasternini genera and subgenera known from the Republic of South Africa The key includes the genera recorded from the Republic of South Africa by Hansen (1999a) and Hebauer (2006). Due to unclear limits of Cercyon and Parastromus, the subgenera of Cercyon recorded from RSA are also included into the key to allow the identification of as many species as possible. 2 3Pachysternum Cryptopleurum4 6Pelosoma5Pelocyon Delimetrium Evanesternum gen. n.Parastromus7 8Cercyon Paracycreon)Cercyon (Arcocercyon)9Cercyon (s. str.) C. nigriceps Parastromus Cercyon (s.str)
Taxon Treatment
- Arriaga-Varela, Emmanuel; Seidel, Matthias; Fikacek, Martin; 2018: A new genus of coprophagous water scavenger beetle from Africa (Coleoptera, Hydrophilidae, Sphaeridiinae, Megasternini) with a discussion on the CercyonsubgenusAcycreon, African Invertebrates 59: 5-8. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
