Diario del proyecto Insects - Southern Africa (identified for the 1st time on iNat or difficult to identify)

24 de febrero de 2024

Glipidiomorpha obsoleta Franciscolo 1955

Original description with illustration in:
Franciscolo, M. E. 1955. Mordellidae and Scraptiidae in the Collections of the Durban Museum (XXIX. Contribution to the Knowledge of Mordellidae and Scraptiidae). Part I. Durban Museum Novitates, Vol. IV. Part XII

Hind tibiae with a distinct dorso-lateral ridge, hairy eyes, elytra with file-like sculpture. The upper surface is prevailingly covered by grey pubescent markings, as shown in the figure; the pronotum bears three small areas covered by black hairs, one elongate at middle, and one at each side of it; maxillary palpi ferrugineous; front and middle tarsi a little clearer; anterior femora rusty-reddish. Pubescent markings of elytra of moderate size, leaving free large black spots (see figure); the postmedian pubescent band is normally sinuous on each elytron; pygidium covered with whitish pubescence, leaving a small subtriangular black spot at base.

Type locality: Chirinda Forest, Zimbabwe

iNat observation: https://www.inaturalist.org/observations/111636146

Publicado el febrero 24, 2024 06:57 TARDE por traianbertau traianbertau | 0 comentarios | Deja un comentario

Sphaeromorda natalensis Franciscolo 1950

Original description in:
Franciscolo, M. E. 1950. Ermischiella papuana n. gen. n. sp. di Mordellide della Nuova Guinea e diagnosi preliminari di tre nuovi generi africani (16 Contributo alla conoscenza dei Mordellidae).

Redescription with illustrations in:
Franciscolo, M. E. 1956. Mordellidae and Scraptiidae in the Collections of the Durban Museum (XXIX. Contribution to the Knowledge of Mordellidae and Scraptiidae). Part II Durban Museum Novitates, Vol. IV. Part XIV

Body shape extremely wide, short and convex. Colour black; the black surface of the body, mainly head and thorax, has a bluish violaceous shine. Ground pubescence dark, with violaceous or reddish violaceous shine on head and thorax, but with no shine at all on the elytra and undersurfaces. Scutellum covered by dense, long, shiny golden white pubescence, with dense file-like sculpture. Elytra (figure) extremely convex and wide, file-like punctation, very regularly and separately rounded at apex. Ground pubescence black, with no shine at all, with markings of whitish hairs distributed as indicated in the figure.

Type locality: Umhlanga, Durban (KZN, South Africa)

iNat observation: https://www.inaturalist.org/observations/139509787

Publicado el febrero 24, 2024 06:09 TARDE por traianbertau traianbertau | 0 comentarios | Deja un comentario

Calognathus chevrolati chevrolati Guérin-Méneville 1836

Calognathus chevrolati is a black tenebrionid with pale scale-like setae covering some areas. The pronotum is broader than long and the head is nearly as large as the pronotum. The tarsi are compressed laterally and have long setae forming sand-shoes for digging. Males have the long, slender, anteriorly projecting mandibles. There are 4 subspecies described.

Calognathus chevrolati chevrolati:
Mandibles of males strong and angularly arcuate, with strong and long basal crest. Pronotum more than twice as wide as long, basal margin doubly arcuate. Elytra almost as wide as long, cordiform, strongly deplanate. The entire dorsum of the head with the exception of the clypeal margin, as well as entire disc of pronotum, densely covered with scale-like hairs; pubescence bicoloured: whitish behind clypeal margin and lateral parts of pronotum, brown on vertex and median part of pronotum, A broad lateral band and broad sutural margin of elytra with similar pubescence to that of head and pronotum, in whitish to light brown colour. A narrow, almost rectilinear V-shaped area of each elytron either completely bare (males), or brown pubescent and only apically bare and black (females).

Distribution: north and south of the Orange river.

Description and illustration in:
Koch, C. 1950. The Tenebrionidae of Southern Africa. I. First account of the Tenebrionidae collected on the University of California-Transvaal Museum Expedition, 1948. Annals of the Transvaal Museum, 21

iNat observation: https://www.inaturalist.org/observations/188002707

Publicado el febrero 24, 2024 02:28 TARDE por traianbertau traianbertau | 0 comentarios | Deja un comentario

23 de febrero de 2024

Asthenochirus plicatulus Fairmaire 1884

Subovate, very convex, black, covered with pale and yellow setae. Pronotum two and a half times as wide as it is long. Head anteriorly with transverse furrow. Elytra coarsely punctate and striped, the stripes with transverse folds, epipleura punctate.

Original description in:
Fairmaire, L. 1884. DESCRIPTION OF NEW SPECIES OF SOUTH-AFRICAN TENEBRIONIDÆ. Transactions of the South African Philosophical Society, 4(2), 197–199. doi:10.1080/21560382.1884.9526207

Distrubution: South Africa, Eswatini; Zimbabwe; Namibia.

iNat observations: https://www.inaturalist.org/taxa/651670-Asthenochirus-plicatulus/browse_photos

Publicado el febrero 23, 2024 05:30 TARDE por traianbertau traianbertau | 0 comentarios | Deja un comentario

22 de febrero de 2024

Renatiella scrobipennis (Haag-Rutenberg 1875)

A black nocturnal or crepuscular Kalahari beetle with numerous shallow grooves on thorax and elytra; found under shrubs and trees in arid plains. (Penrith, M. L. 1979. Revision of the western southern African Adesmiini (Coleoptera: Tenebrionidae). Cimbebasia, 5(1))

Oblong-oval, black, opaque; the head is biimpressed between the eyes, covered with large punctuations converging in part longitudinally; thorax less transverse, only marginate at the sides in front, evenly rounded, densely scrobiculate-punctate, and some smooth spots on the back; elytra shortly oval, almost immarginate, densely scrobiculate-foveolate; legs a little elongated.

Illustrated in:
Koch C. 1955. Monograph of the Tenebrionidae of southern Africa Vol I (Tentyriinae, Molurini Trachynotina: Somaticus Hope). Transvaal Museum Memoir 7

Original description in:
Haag-Rutenberg, G.J. 1875. Beiträge zur näheren Kenntniss einiger Gruppen aus der Familie der Tenebrioniden. Deutsche Entomologische Zeitschrift 19(7): 1-56

iNat observation: https://www.inaturalist.org/observations/136112704

Publicado el febrero 22, 2024 02:56 TARDE por traianbertau traianbertau | 0 comentarios | Deja un comentario

Histrionotus omercooperi Koch 1955

Genus Histrionotus: Elytra with two rows of long sharp spines. Two species described: Histrionotus lightfooti (Peringuey, 1892) from Porth Nolloth, Northern Cape, South Africa and Histrionotus omercooperi Koch 1955 from Aus, Namibia.

Histrionotus omercooperi, description in:
Koch C. (1955) Monograph of the Tenebrionidae of southern Africa Vol I (Tentyriinae, MoluriniTrachynotina: Somaticus Hope). Transvaal Museum Memoir 7, page 43.
Epipleural carina of elytra with long (shorter spines in H. lightfooti) and sharply pointed spines (the epipleural margination simple, with the spines inserted on the carina itself); primary costa with identical long spines.

iNat observation: https://www.inaturalist.org/observations/52366184

Publicado el febrero 22, 2024 11:09 MAÑANA por traianbertau traianbertau | 0 comentarios | Deja un comentario

Graphipterus bivittatus simulator Péringuey, 1892

Head covered with a yellow pubescence without any median longitudinal denudation; first and second joint of the antennæ and basal part of the third reddish; prothorax, with the outer sides crenulate, covered with deep ochre-yellow hairs in the centre, turning to white on the sides, and without any median longitudinal band; elytra elongato-quadrate, covered with white hairs and having on each side, close to the suture, a broad black band reaching from base to apex and of equal width throughout, a narrower, very dark, almost black, narrow line, equi-distant from the black band and the outer margin, and a still narrower line of lighter brown between that one and the outer margin, the background is thus divided into a sutural, two dorsal, and a marginal yellowish-white bands; abdominal segments hairless; legs black. Length 12 mm.; width 54 mm.

Closely allied to G. bivittus bivittatus, but more quadrate, the black band near the suture is not at all attenuate behind, and the dorsal bands are very well defined, broader, and deeper in colour.

Original description in:
Peringuey, L. 1892. Third contribution to the South African coleopterous fauna. On beetles collected in tropical south-western Africa by Mr. A.W.ERIKSSON. Transactions of the South African Philosophical Society, 6 (2): 1-94.

Type locality: Odanga, Cunene River, Ovamboland, Namibia

iNat observation: https://www.inaturalist.org/observations/195694161

Publicado el febrero 22, 2024 07:35 MAÑANA por traianbertau traianbertau | 0 comentarios | Deja un comentario

20 de febrero de 2024

Locris sanguinipes (Walker, 1851)

Locris sanguinipes is a generally black and pubescent cercopid with red legs; the costal and apical margins of the forewings may also occasionally be red.

Original description:
Black: head and chest shagreened, dull: head above depressed: face convex, very prominent; keel and cross ridges slight: mouth red, with a black tip: abdomen pitchy, red at the base and at the tip: legs red; thighs partly pitchy: fore-wings dark brown; cross-veins very few, occupying only the tips of the wings: hind-wings grayish, brown at the base. Length of the body 2 lines; of the wings 6 lines.
Walker, F., 1851b. List of the specimens of homopterous insects in the collection of the British Museum. British Museum, London. Part III: (4)

Observation on inat:

Illustration in:
Distant, W.L. 1911. Insecta Transvaaliensia: A Contribution to a Knowledge of the Entomology of South Africa. Table 20, figure 16.

Publicado el febrero 20, 2024 09:08 TARDE por psyllidhipster psyllidhipster | 0 comentarios | Deja un comentario

Parastizopus armaticeps armaticeps (Péringuey 1892)

P. armaticeps is a medium-sized flightless shiny black beetle measuring 15 mm. It belongs to a genus characterized by the plain elytral base (without border), relatively large and oblong body, the presence of elytral rows. Median part of mentum wide, moderately convex, without longitudinal carina; prosternal process projecting posteriad.
P. armaticeps: Anterior margin of head with moderately deep clypeal emargination, base of labrum not visible; surface of the abdominal ventrites covered with punctures. Elytral humeri moderately obtuse, slightly produced anteriad. Fore and mid tibiae in both sexes with sharp or obtuse edge at apex.

Original description in:
Péringuey, L. 1892. Fourth contribution to the South African coleopterous fauna. Description of new Coleoptera in the South African Museum. Transactions of the South African Philosophical Society, 6
Black, moderately shining, hairless; head punctulated with a deep transverse impression, epistome arcuated, incised in the centre with two sharp short spines on each side of the dent; prothorax with the sides rounded and the anterior half broader than the posterior, finely punctured, depressed; elytra less broad than the prothorax, nearly parallel, rounded behind, depressed and finely striated; anterior tibiae broadly dilated at the apex, and with an obtuse tooth inwardly, the intermediate and posterior acutely rugose, dilated at the apex with a sharp tooth outside and a blunt one inside, the posterior ones are also sub-falcate.

The species is distributed throughout the Kalahari dune system and inhabits semi-stable and stable dune faces. In the southern Kalahari it is closely associated with its food plant Calobota linearifolia, the fallen leaves and twigs of which are staple diet for adults and larvae.
Subsociality involving biparental care has been extensively studied in this species in the Kalahari. Parental investment in a very small number of offspring is a response to rapid sand desiccation and food scarcity. The beetles dig aggregated burrows in the sand after rains in the vicinity of Gannabushes. Only slight modification of these burrows can take place once the sand is dry, owing to its friability and the likelihood of burrows collapsing. During drought, therefore, beetles are dependent on already existing burrows. Long-term pair bonds are formed, the beetles digging breeding burrows into which females bring food after foraging at night. The adoption of a nocturnal lifestyle allows P. armaticeps to escape high daytime surface sand temperatures. Both parents care for the young and excavate a breeding burrow together. They play similar roles in burrow excavation and protection until the eggs hatch, after which male and female roles diverge markedly. Females collect detritus on the surface at night, depositing this at the burrow entrance, which they also clear of sand in the early evening. Males remain inside the burrow and dig to deepen and extend it, maintaining its moisture level as the sand desiccates. They also pull the food dropped by the female down to the burrow base to form a food store for the offspring. Both sexes guard the burrow and attack same-sex intruders, especially in the early phases of reproduction. The parents remain inside with the pupal cocoons until the teneral adults eclose.
Breeding success depends primarily on male size because larger males dig deeper burrows which remain moist longer to favor larval development, and females select the largest male partners by pushing under them to judge their weight. Parastizopus beetles are also unique among tenebrionids in terms of an extraordinary courtship behavior. After heavy rainfalls, the beetles emerge from aggregation burrows, which they inhabit during drought, and court in small mixed-sex groups on the ground surface. Females select their partners among the males present based on male body mass, which indicates the digging ability of a male. The courting groups are initiated by males, which exhibit a characteristic calling behavior: Males do a headstand and expose their aedeagus emitting a pheromone that attracts females.

iNat observation: https://www.inaturalist.org/observations/36878773

Publicado el febrero 20, 2024 06:47 TARDE por traianbertau traianbertau | 0 comentarios | Deja un comentario

Rhinaulax sericans Stål, 1856

The genus Rhinaulax is easily identified among all other African Cercopidae by the very long antennae, segment 3 about three times longer than segment 2.
Rhinaulax sericans should differ from the more common R. analis in the general dark coloration, the pubescence, and the the relatively longer head.

Translated description from Stål 1866:
Black, pubescent, punctate; metasthetium [the ventral side of the metathorax = metasternum] posteriorly, hind coxae almost entirely and tegmina testaceous; the intraocular part of the head is twice as wide as it is long. On the front, an oblong, wide impression, extended from the base beyond the middle, furrowed in the middle, lined.

Observations in inat:

Publicado el febrero 20, 2024 01:55 TARDE por psyllidhipster psyllidhipster | 0 comentarios | Deja un comentario