Protaetia (Potosia) angustata Germar, 1817 (Cetonia)

Cetonia angustata Germar, 1817 - in Reise nach Dalmatien und das Gebiet von Ragusa. Leipzig und Altenburg: A.F. Brockhaus, 1817, II, p. 213, tab. 9, fig. 3.
Cetonia hungarica Latreille, 1807, Gen. Crust. Et Ins., II, p.128 (nomen preoccupatus, synonymous).
Potosia angustata var. angustula Reitter, 1898. Wiener Entomologische Zeitung: 337-360, et Best. Tab., 1889, 37: 64.
Potosia angustata ssp. orientalis Alexis et Delpont, 1996, (nomen preoccupatus by Cetonia orientalis Gory et Percheron, 1833; synonymous by Smetana, 2006).
Potosia angustata ab. eibesensis Reitter, 1902, Wiener Entomologische Zeitung, 21: 139.


French

Potosia angustata est une cetoine de 17-27mm de longueur, tres variable au plan du chromatisme des imagos allant du vert vif metallique uniforme jusqu‘au noir complet en passant par le rouge pourpre fonce et le bleu fonce. Sa distribution est large de l‘Europe occidentale (Suisse et Italie du NE) jusqu‘a la Turquie d‘Anatolie. Elle est presente sur les Iles de la mer Egee, a Rhodes et en Crete, mais non signalee de Chypre.

Elle se singularise des autres Potosia par son apophyse mesosternale petite, non proeminente devant les hanches medianes et glabre a ponctuation lisse a fine et eparse, par l‘absence de tache blanche aux genoux, et par la forme des parameres de son edeage, seul et unique critere a prendre en compte pour la differencier du taxon tres proche besucheti Alexis et Delpont 1996 (voir note A ce propos).

Dans la region du Levant, l‘espece serait representee par la race P.(P.) angustata angustula Reitter peu tranchee, qui n‘a ete individualisee que recemment (1996) et dont la limite occidentale de distribution passerait par une ligne joignant Blikesir a Silifke en Turquie. Elle est presente en Anatolie orientale jusqu‘au villayet d‘Artvin et au sud du Hatay , ainsi que du Nord de la Syrie (stations de Halep et de Idlib). Elle ne semble pas avoir ete signalee du Liban, de la Palestine, de Jordanie et d‘Israel.

La couleur du dessus de la forme typique de angustula est en general bronze cuivreux avec le dessous bronze a vert fonce selon la description originale de Reitter. Parfois le dessus peut etre entierement bleu ou violet pourpre clair, avec le dessous bleu-violet a eclat vert (var. eibesensis Reitter, 1902) ou bien avec le dessus vert luisant, bleu-vert fonce a bleu-noir.

La cetoine est souvent frugivore (sur poirier et abricotier), et que l‘on rencontre aussi sur les capitules de Onopordon et de Carduus, et encore sur les fleurs d‘oliviers et de vigne sauvage. Les larves semblent se developper en dehors des cavites d‘arbres, le plus souvent dans la rhizosphere de plantes a la faveur de terreau vegetaux divers et aussi dans des sols fortement enrichis en feces de chevres (observation en Turquie dans le sol d‘enclos de bergeries).

Note A: Afin de preciser le statut des taxa decrits (P.besucheti, P.angustata angustata et P.angustata angustula), plusieurs prelevements d‘imagos ont ete realises en mai et juin 2006 de la region d‘Antalya a la region de Mersin (Adana) en Turquie et fixes dans l‘alcool 95 degrees, puis envoyes en septembre 2006 au laboratoire de Montpellier en vue d‘un sequencage de l‘ADN mitochondrial (via H.P. Aberlenc, coordinateur du programme barcode). Les resultats sont attendus.

English

Potosia angustata, is a Cetonina ofe 17-27 mm length, with very variable chromatism ranging from the green metallic uniform until the complete black while passing by the dark purple red and the dark blue. Its distribution is wide from Western Europe (Swiss and NE Italy) to Anatolia. It is present also on the Aegean Islands, in Rhodos and in Crete, but not found in Cyprus.

Itis identifieable from the other Potosia species by its mesosternal process quite small, non prominent in front of the median hips and glabrous with smooth, fine and scattered punctuation, by the absence of white spot to the knees, and by the shape of the parameres of edeagus. This is the only character to be taken into consideration to differentiate P.angustata from the taxon very closed taxon P.besucheti Alexis and Delpont 1996 (see Note A).

In the area of Levant, the species is represented by the not very distinct subspecies P.angustata angustula Reitter, which was described only recently (1996) and whose Western limit of distribution would pass the line connecting Blikesir to Silifke in Turkey (see the red line on the map). It is present in eastern Anatolia until the villayet of Artvin and in the south of Hatay, as well as in North of Syria (stations of Alep and Idleb). It does not seem to have been seen of Lebanon, Palestine, Jordania and Israel.

The color of the dorsal surface of the typical form of angustula is in general bronzed copper with the ventral surfacet with dark green, this according to the original description of Reitter. Sometimes the dorsal surface can be entirely blue or bronzed purple to purple light, with ventral part blue-violet with green glare (ab. eibesensis Reitter, 1902) or with the dorsal part green shining, blue-dark green to blue-black.

This Cetoniinae is often frugivorous (on pear tree and apricot tree), but it can be found also on flowerheads of Onopordon and Carduus, and also on the flowers of olive-trees and wild vine. The larvae generally develop, apart in the cavities of trees, in the soil near the rooths of plants, in the compost various plants and also in soils strongly enriched in faeces of goats (observation in Turkey in the soil of sheepfolds).

Note A: In order to clarify the value of the existing related taxa (P.besucheti, P.angustata angustata and P.angustata angustula) several samples of imagoes were collected in May and June 2006 from the area of Antalya until the area of Mersin (Adana) in Turkey. They were fixed in alcohol 95%, then sent in September 2006 to the Laboratory of Montpellier for the DNA mitochondrial analysis (via H.P. Aberlenc, Coordinator of the Program Barcode). The results are awaited.


(click to enlarge)
Distribution of P.angustata subspecies, from Tauzin

Protaetia (Potosia) angustata Germar, 1817 (Cetonia)

P.angustata ssp.angustata
from Turkey, photo Sabatinelli
P.angustata ssp.angustata
from Adana (Turkey), photo D.Prunier
P.angustata ssp.angustata
from Medvedev
P.angustata ssp.angustata
from Medvedev
P.angustata ssp.angustata
from Baraud
(click to enlarge)
Paramera of P.angustata ssp.angustata, P.besucheti and P.angustata angustula,/i>, from Alexis and Delpont, 1995

Protaetia (Potosia) angustata ssp. angustula Reitter, 1890 (Potosia)

Present in eastern Anatolia until the villayet of Artvin and in the south of Hatay, as well as in North of Syria (Alep and Idleb).

P.angustata ssp.angustula f.typ.
from Mersin (Turkey), photo D.Prunier
P.angustata ssp.angustata ab.eibesensis
from Adana (Turkey), photo D.Prunier

References

Alexis R., 1995 - Les variations chromatiques de Potosia angustata Germar, 1817 (Coleopteres, Cetoniidae) Lambillionea, XCV, 1: 55-62.
Alexis R. et Delpont M., 1996 - Contribution a l‘etude du genre Potosia Mulsant, 1871. Description de Potosia besucheti nov.sp. et de Potosia angustata orientalis nov.ssp. (Coleoptera, Scarabaeoidea, Cetoniidae). Lambillionea, XCVI, 3.

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