[Rhogogaster sp. F] Vert pomme (Corrèze)

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En juin, j'ai eu la chance d'observer cette magnifique bestiole vert pomme, que je suppose être une Rhogogaster
C'était la première fois que j'en voyais une


Catherine Reymonet : France : Peyrelevade : 19290 : 12/06/2024
Altitude : 802 m - Taille : 11-12 mm
Réf. : 347233


Catherine Reymonet : France : Peyrelevade : 19290 : 12/06/2024
Altitude : 802 m - Taille : 11-12 mm
Réf. : 347234

J'ai essayé la clé de Taeger et Viitasaari mais je ne suis pas complètement sûre de moi.

1.(aa) Terga more or less green, dorsally largely black and often forming a more or less broad median black stripe on the abdomen
(bb) Postocellar area and surrounding furrows mainly black, even in very pale specimens at least the anterior part of the postocellar area black
(cc) Black color of the head usually more extensive and forming a ‘∞’ : only upper parts of frontal ridges green, frontal field and frons between antennal furrow and inner eye margin largely black, the black parts fused above the antennal sockets, or face mainly black with small green spots on the upper frontal ridges (rarely completely black without green spots), exceptionally in very pale specimens the black mark above the antennae dissolved in small black spots ; if exceptionally as in (c), then (a) and (b) do not fit.
(dd) Upper head usually shiny, without or only with weak microsculpture.
(ee) Plantar lobes usually larger, distance between 1st and 2nd in ♂ 0.6–2.0 ×, in ♀ 0.7–1.4 × as long as its own length (Figs 3h–n).
(gg) Saw of viridis or scalaris type.
(hh) Median mesoscutal lobes usually mainly black, each with a more or less large lateral green spot, rarely completely black

2. (bb) Black color of the head usually more extensive and forming a ‘∞’ : only upper parts of frontal ridges green, frontal field and frons between antennal furrow and inner eye margin largely black, the black parts fused above the antennal sockets, or face mainly black with small green spots on the upper frontal ridges (rarely completely black without green spots), exceptionally in very pale specimens the black mark above the antennae dissolved in small black spots.

C'est là que je ne sais pas trop :

3. (a) Occiput green, only black close to the foramen magnum and on the lower part of the back of the occipital area
(b) Vertex beside postocellar area green, the black marks on the frons only reach the anterior parts of postocellar area
(c) Mesoscutellum and its appendage green, without black line between them
(d) in Fennoscandian ♀ abdomen usually with a complete median black stripe that covers about 40–60 % of the dorsal surface ; in specimens from other parts of Europe abdomen frequently less black to nearly completely green
(e) Plantar lobes very large, distance between 1st and 2nd in ♀ 0.7–1.0 × as long as its own length => R. chlorosoma (Benson, 1943)
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(aa) Occiput largely black, near the occipital carina ± pale ; only exceptionally occiput mainly pale, but then the other characters do not fit.
(bb) Vertex beside postocellar area black, the black marks of the frons reach to the occipital carina (this applies to the available northern European specimens ; in more southern specimens the black frequently reaching only about to the middle of postocellar area, or rarely it has the same pattern as in R. chlorosoma as described above).
(cc) Mesoscutellum and its appendage variably colored, more or less marked with green, sometimes mainly or even completely black ; if both mainly green, usually at least a narrow black line between them remains.
(dd) in Fennoscandian ♀ abdomen usually with a complete median black stripe that covers about 70–80 % of the dorsal surface (rarely abdomen pale as in chlorosoma, exceptionally nearly completely green, but then occiput darker, and plantar lobes smaller).
(ee) Plantar lobes smaller, distance between 1st and 2nd in ♀ (0.9–)1.0–1.4 × as long as its own length.

D'après les photos de la figure 3, ce serait plutôt scalaris que chlorosoma donc je choisis l'option aa :

4. (bb) Coloration usually not pale as in chlorosoma, occiput usually largely black (Figs 4e–h).

5. (a) Mesoscutellar appendage usually with few pits or without pits, frequently without distinct microsculpture and shiny, but sometimes with distinct microsculpture and rather mat
(b) Carina of the postocellar area in subarctic specimens mainly black, or green only laterally, exceptionally completely green ; in specimens from other parts of Europe completely green or more or less black in the middle.
(c) Frontal field with shallow frontal groove or flat, thus frontal ridges often only weakly defined, antennal crests usually not bent up.

Je ne vois pas vraiment mais les autres options sont nordiques donc ça ne va pas => R. scalaris (Klug, 1817)

Additional notes. Morphology : Body size up to about 12 mm in other parts of Europe. Upper head and thorax usually shiny with more or less dense pits. Density of microsculpture variable, sometimes nearly missing, sometimes very dense and nearly mat, usually more or less distinct between the pits, but shiny. Mesoscutellar appendage outside Fennoscandia usually smooth and shiny, or with few pits. Frontal field nearly flat or with more or less distinct furrow. Plantar lobes medium sized, distance between 1st and 2nd in ♂ 1.2–1.6, in ♀ 0.9–1.3 × as long as its own length.
Color. Northern forms seem to be usually much darker than specimens from Central Europe. In the darkest specimens the thorax is dorsally completely black (pronotum and tegula still green) and the upper head nearly completely black (without green spots on the frontal ridge). From outside Fennoscandia very pale specimens are known that are nearly completely green and very similar to R. chlorosoma.
Distribution: Europe, also eastern Palaearctic. Occurrence in the Nearctic realm needs confirmation. It may be, that more than one species is involved here.

Qu'en pensez-vous ?

[DChapuis]

Je pense que sans connaître précisément les longueurs respectives des pulvilli sur les tarses 3, on ne peut aller plus loin.

[lauzette]

Un autre avis ?

[DanBB36]

Sans passage sous bino c'est râpé.

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