{"id":19123,"date":"2024-04-06T10:09:11","date_gmt":"2024-04-06T08:09:11","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=19123"},"modified":"2025-04-02T09:28:24","modified_gmt":"2025-04-02T07:28:24","slug":"mecistogaster-linearis","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2024\/04\/06\/mecistogaster-linearis\/","title":{"rendered":"P\u00e9rou – Mecistogaster linearis (Fabricius, 1777)"},"content":{"rendered":"\n

Mecistogaster linearis est un spectaculaire Coenagrionidae, un g\u00e9ant, qui a appartenu \u00e0 la famille des Pseudostigmatidae, une famille qui n’a plus de membres, car ils ont tous rejoint les Coenagrionidae. Ces g\u00e9ants (Mecistogaster, Megaloprepus, etc.) sont regroup\u00e9s au sein de la sous-famille des Pseudostigmatinae.
Il semble avoir les ailes courtes, mais c’est son abdomen qui est tr\u00e8s long puisqu’il atteint 105 \u00e0 118 mm et les ailes 50 \u00e0 60 mm (1) (2). Le thorax est minuscule (relativement) et l’insecte atteint une longueur total moyenne de 122 mm, soit presque moiti\u00e9 plus long qu’un Anax imperator<\/a>, la plus grande libellule d’Europe dont les plus grands sujets atteignent 84 mm !
Rambur (5) lui donne 14.5 cm de longueur totale<\/p>\n\n\n\n

\"Mecistogaster<\/a><\/figure>
\n

Nous avons rencontr\u00e9 ce Mecistogaster linearis en for\u00eat humide, le 20\/08\/2023, pr\u00e8s de l’ARC (Chino), tr\u00e8s \u00e0 l’ombre. Malheureusement, il s’est tr\u00e8s rapidement envol\u00e9 et si j’ai plusieurs photos, elles sont toutes faites de loin et sous le m\u00eame angle.

Le long abdomen permet aux femelles de pondre dans les trous d’arbres (MACHADO & MARTINEZ, 1982) et le c\u0153ur des Bromeliaceae (Calvert, 1911). Ces habitats, nomm\u00e9s phytotelmes, contiennent de l’eau quasiment en permanence. Les larves y trouvent de quoi se nourrir, comme bien s\u00fbr des larves de moustiques et d’autres insectes, mais aussi, pour des repas plus consistants, des t\u00eatards de grenouilles. Si on ne rencontre les larves de ces ex-Pseudostigmatidae que dans les phytotelmes, d’autres esp\u00e8ces peuvent s’y rencontrer, et on cite des esp\u00e8ces opportunistes comme Orthemis ferruginea<\/a>, Libellula herculea<\/a>, Gynacantha membranalis<\/a>, m\u00eame Indoaeshna grubaueri<\/a> en Asie et bien s\u00fbr les Leptagrion<\/a>, r\u00e9sidents des Bromeliaceae (7).
J’ai fait une photo, de nuit, d’une esp\u00e8ce non identifi\u00e9e<\/a> dans un trou d’arbre, en Malaisie.<\/p>\n<\/div><\/div>\n\n\n\n

<\/div>\n\n\n\n

Les adultes ont l’habitude, tr\u00e8s rare parmi les odonates, de se nourrir d’araign\u00e9es, captur\u00e9es sur ou juste \u00e0 c\u00f4t\u00e9 de leur toile, voire de proies prises dans les toiles. La fr\u00e9quence de ce comportement et m\u00eame semble-t-il l’exclusivit\u00e9 de ce mode de pr\u00e9dation a d\u00e9clench\u00e9 une \u00e9tude de Stanislav N. Gorb (3) sur la structure cristalline de la cire de la cuticule de Mecistogaster ornata, cherchant \u00e0 expliquer pourquoi ces odonates ne se faisaient pas prendre au pi\u00e8ge des toiles d’araign\u00e9es.
Or, il n’a pas trouv\u00e9 de diff\u00e9rence avec la structure des autres odonates, si ce n’est que la surface de cette cire est facilement pel\u00e9e\/d\u00e9tach\u00e9e par le liquide adh\u00e9sif des toiles d’araign\u00e9e et pr\u00e9vient dans une certaine mesure qu’ils soient pi\u00e9g\u00e9s. Il a \u00e9galement not\u00e9 que ces esp\u00e8ces friandes d’araign\u00e9es ne s’int\u00e9ressaient qu’aux toiles bien \u00e0 la lumi\u00e8re ou au soleil, sans doute pour \u00e9viter d’y \u00eatre pi\u00e9g\u00e9es par inadvertance.<\/p>\n\n\n\n

<\/p>\n\n\n\n

\"Mecistogaster<\/a><\/figure>
\n

Mecistogaster linearis est proche de M. lucretia ; il s’en diff\u00e9rencie par la pr\u00e9sence d’une double bande ant\u00e9hum\u00e9rale, chacune en forme de triangle dont les bases sont oppos\u00e9es. Ici, l’angle de la prise de vue n’est pas bon pour ce crit\u00e8re ; de plus, la bande la plus interne, en forme de triangle \u00e0 base ant\u00e9rieure, est presque invisible, comme effac\u00e9e (clic sur image).
De plus, M. lucretia m\u00e2le pr\u00e9sente une curieuse d\u00e9formation de l’aile sur son bord costal, juste avant le pseudopt\u00e9rostigma, absente ici.<\/p>\n\n\n\n

Mecistogaster linearis m\u00e2le, thorax, P\u00e9rou, ARC (Chino), 20\/08\/2023<\/p>\n<\/div><\/div>\n\n\n\n

<\/div>\n\n\n\n

On note sa taille et son pseudopt\u00e9rostigma qui s’\u00e9tale sur deux rang\u00e9es de cellules (6 et 2, en principe), bien visible sous forme d’une tache sombre \u00e0 l’apex de l’aile. Cet apex est marqu\u00e9 d’une tache laiteuse quand les sujets sont immatures, coloration qui dispara\u00eet \u00e0 maturit\u00e9. Ici, il y a une tache vraiment jaune ; Garrison, von Ellenrieder et Louton (4) \u00e9crivaient en 2010 :\u00a0\u00bb The genus is badly in need of revision (Le genre est en grand besoin de r\u00e9vision)\u00a0\u00bb ce qui signifie que la d\u00e9nomination et la s\u00e9paration des esp\u00e8ces est certainement \u00e0 revoir avec la possibilit\u00e9 de d\u00e9couvrir de nouvelles esp\u00e8ces cach\u00e9es dans cette impr\u00e9cision…
D’ailleurs, D\u00e9borah S. Soldati Lacerda & Angelo B. Monteiro Machado (8) en 2019 ont cr\u00e9\u00e9 trois nouvelles esp\u00e8ces cach\u00e9es au sein du complexe Mecistogaster amalia…

Son aire de distribution s’\u00e9tend du Nicaragua au sud du Br\u00e9sil et au nord de l’Argentine.
IUCN Red List<\/a><\/p>\n\n\n\n

Le genre Mecistogaster<\/strong> a \u00e9t\u00e9 cr\u00e9\u00e9 par Rambur (1842) (5) mais il n’y explique pas le choix de ce terme. Cependant, en grec mecist -o<\/em> signifie (6) –le plus long<\/em> et gaster<\/em> – le ventre, l’estomac<\/em> et par extension l’abdomen<\/em>. Il n’y a pas besoin d’\u00eatre plus explicite !
Linearis<\/strong> n’est pas non plus document\u00e9, mais le m\u00eame auteur \u00e9crit : \u00ab\u00a0Abdomen tr\u00e8s-long, tout \u00e0 fait lin\u00e9aire<\/em>…\u00a0\u00bb. Linearis<\/em>, en latin, signifie –form\u00e9 avec des lignes, lin\u00e9aire<\/em>.<\/p>\n\n\n\n

<\/div>\n\n\n\n

1- Ingemar Hedstr\u00f6m and G\u00f6ran Sahl\u00e9n, \u00ab\u00a0A key to the adult Costa Rican \u201chelicopter\u201d damselflies (Odonata : Pseudostigmatidae) with notes on their phenology and life zone preferences\u00a0\u00bb, Rev. Biol. Trop. 49(3-4 ): 1037-1056, 2001.
2- Ola M. Fincke, \u00ab\u00a0Giant damselflies in a tropical forest : reproductive biologyof Megaloprepus caerulatus with notes on Mecistogaster (Zygoptera: Pseudostigmatidae)\u00a0\u00bb, Adv. Odonatol. 2:13-27, December, 1984.
3- Stanislav N. Gorb, Wing surface in the damselfly Mecistogaster ornata (Zygoptera,Pseudostigmatidae) : interactions between nanoscale wax and sticky spider webs, International Journal of Odonatology, 2019, Vol. 22, No. 1, 51\u201357.
4- Damselfly Genera of the New World, Annotated Key to the Zygoptera, Rosser W. Garrison, Natalia von Ellenrieder et Jerry A. Louton, Johns Hopkins University Press, 2010
5- M. P. Rambur, Histoire Naturelle des Insectes N\u00e9vropt\u00e8res, 1842.
6- Dictionary of Word Roots and Combining Form, compiled from the Greek, Latin and other languages with special reference to biological terms and scientific names, Donald J. Borror, 1960.
7- Description and natural history of the Costa Rican Odonata larvae Megaloprepus caerulatus (Drury, 1782 (Zygoptera, Pseudostigmatidae), A. Ram\u00edrez, Odonatologica 26(1) : 75-81, March I. 1997.
8- D\u00e9borah S. Soldati Lacerda & Angelo B. Monteiro Machado, The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839), Zootaxa 4668 (2) : 207\u2013228, 2019.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
Accueil P\u00e9rou<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Mecistogaster linearis est un spectaculaire Coenagrionidae, un g\u00e9ant, qui a appartenu \u00e0 la famille des Pseudostigmatidae, une famille qui n’a plus de membres, car ils ont tous rejoint les Coenagrionidae. Ces g\u00e9ants (Mecistogaster, Megaloprepus, etc.) sont regroup\u00e9s au sein de la sous-famille des Pseudostigmatinae.Il semble avoir les ailes courtes, mais c’est son abdomen qui est […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1308,1303],"tags":[],"class_list":["post-19123","post","type-post","status-publish","format-image","hentry","category-coenagrionidae-perou-2","category-perou","post_format-post-format-image"],"yoast_head":"\nMecistogaster linearis - 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