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Aposematism/Lygistopterus anorachilus


Aposematism/Lygistopterus anorachilus
Photo Information
Copyright: Marcello Romano (marcellr) Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 208 W: 38 N: 1012] (3514)
Genre: Animals
Medium: Color
Date Taken: 2006-08-04
Categories: Insects
Camera: Olympus C-7070 Wide Zoom
Exposure: f/3.2, 1/60 seconds
Photo Version: Original Version
Date Submitted: 2007-12-05 8:36
Viewed: 4145
Points: 22
[Note Guidelines] Photographer's Note
NET-WINGED BEETLES

Coleoptera, Lycidae

Lygistopterus anorachilus Ragusa, 1883

Lenght: 10-12 mm.

Distribution: Endemic of Sicily and Sud Italy

*****

Lycidae is a family in the beetle order Coleoptera, members of which are commonly called net-winged beetles.
Lycid Beetles are elongated beetles and may be found on flowers or on plant surfaces. Some species adults are nectar-feeders, some are not feed at all. Their head is usually triangular in shape. Antennae are medium long , thick and in serrate form (saw-tooth-like segments). Most of them are in typical brick-red colour. Adults usually found on flowers or plants surface.
Larvae can be found under bark, in soil or in leaf litter. They prey on other insect larvae and pupae.
Most of them are brick-red in colour. The brick-red and black colours of of Lycid Beetle are a warning to predators that the beetle is highly toxic and distasteful. This could be the second most popular visual warning signal in the insects world, next to the yellow and black strips of wasps and bees.
Aposematism, perhaps most commonly known in the context of warning colouration, describes a family of antipredator adaptations where a warning signal is associated with the unprofitability of a prey item to potential predators. It is one form of "advertising" signal, with many others existing such as the bright colours of flowers which lure pollinators. The warning signal may take the form of conspicuous colours, sounds, odors or other perceivable characteristics. Aposematic signals are beneficial for both the predator and prey, who both avoid potential harm.
This tendency to become highly noticeable and distinct from harmless organisms is the antithesis of crypsis, or avoidance of detection.
Aposematism has been such a successful adaptation that harmless organisms have repeatedly evolved to mimic aposematic species.
Many other insects including moths, flies, wasps and other beetles, mimic its colours. Some of these are also toxic which enhance the warning signal (Müllerian mimicry).
But some are not toxic nor distasteful, they simply gain the same benefit by fraud (Batesian mimicry).
In Batesian mimicry the mimic shares signals similar to the model, but does not have the attribute that makes it unprofitable to predators (e.g. unpalatability). It is named after Henry Walter Bates, an English naturalist whose work on butterflies in the Amazon rainforest was pioneering in this field of study.


Note in italiano

I Lycidae costituiscono una piccola Famiglia di Coleotteri, che conta in Italia solo 6 specie.
Il Genere Lygistopterus comprende in Europa due specie molto simili, col capo prolungato a forma di rostro.
Il Lygistopterus anorachilus, che qui vi presento, è endemico dell'Italia meridionale
e della Sicilia, dove fu descritto nel 1883 dall'entomologo palermitano Enrico Ragusa.
Le sue dimensioni oscillano intorno ai 10 mm.
La caratteristica comune ai rappresentanti di questa Famiglia è quella di possedere un corpo depresso, spesso con vivaci colorazioni aposematiche.
Quando animali repellenti o inappetibili risultano tanto vistosamente colorati ed appariscenti da esssere facilmente riconoscibili dai loro predatori la loro colorazione assumerà il significato di dispositivo di avvertimento o di allarme. Il fenomeno prende il nome di aposematismo e le vistose colorazioni di avvertimento quello di colorazioni aposematiche.
A differenza di quelle criptiche, che fanno di tutto per "nascondersi", le specie aposematiche al contrario hanno abitudini diurne ed "ostentano" in modo deciso la loro presenza. Sono controllate nei movimenti, sfuggono difficilmente, e le loro colorazioni sono quasi sempre contrastanti con quelle del substrato. In tal modo conseguono una notevole protezione legata all'apprendimento del predatore, che sara' tanto piu' rapido quanto piu' vistosi saranno i segnali di avvertimento e "scioccante" l'esperienza negativa.

JORAPAVI, uleko, Silvio2006, Alex99, MMM, fiyo, Maite, jrobertop has marked this note useful
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Critiques [Translate]

  • Great 
  • lousat Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 6595 W: 89 N: 15659] (65489)
  • [2007-12-05 8:42]

grazie maestro,io non so piu' cosa dire..buona serata,Luciano

Hola Marcello,
Preciosa toma de este bonito escarabajo, gran definición y detalles en una bella composición, la luz y el fondo son fantásticos, la nota completísima, saludos
José Ramón

Buena composición, luz y colores, aunque
el enfoque es algo justo en algunas zonas.
A pesar de ello una magnífica toma tal como nos tienes acostumbrados.
Saludos.

  • Great 
  • uleko Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3396 W: 172 N: 3310] (10940)
  • [2007-12-05 10:25]

Hello Marcello,
Brilliant composition showing this colourful Beetle on a fern. Excellent sharp details and fine colours. I like the sot background too. Well done!!
Many thanks, Ulla

Marcello, tra un po' mi costringi a fare copia e incolla con le precedenti, nota interessantissima, dettagli perfetti, grande messa a fuoco, cerca di poostare qualcosa di sbagliato altrimenti che ti critico io?
BRAVISSIMO!
Ciao Silvio

  • Great 
  • MMM Gold Star Critiquer/Gold Note Writer [C: 1114 W: 0 N: 2546] (11425)
  • [2007-12-05 19:50]

Hello Marcello
Excellent close-up.Sharp image whit good POVand nice details.Colors and bG blur are very nice.
TFS Michel

Hello Marcello,

Nice sharp picture of this beetle. Well managed light and beautiful natural colours.
Cheers,
Mariki

  • Great 
  • fiyo Gold Star Critiquer/Gold Note Writer [C: 1053 W: 5 N: 3475] (15161)
  • [2007-12-06 3:33]

Hello Marcello,
Wonderful close up. Details are crisp clear.I liked POV,sharpness,lighting and framing a lot.

  • Great 
  • Alex99 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4072 W: 133 N: 7096] (23735)
  • [2007-12-06 8:50]

Hi Marcello.
Great close-up with tremendous details and sharpness of the insect and twig and amazing BG and composition. Superb done. Bravo.
Alexei.

Ciao Marcello,
Splendid capture! Wonderful coleopter!
Excellent coloration and contrast.
Very good perpective; shot rich in details.
Well done!
Thanks for sharing!
Best regards,
José Roberto

  • Great 
  • Maite Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 998 W: 65 N: 1270] (5199)
  • [2007-12-08 6:30]

Excellent macro of this curious and beautiful bug, Marcello! I like a lot the diagonal composition, the excellent details and the beautiful bg.
Congratulations and TFS
Greetings
Maite

P:)

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