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espanolLas especies taxonomicamente aisladas pueden aportar caracteres unicos a la diversidad biologica, particularmente en el ambito de la diversidad etologica. Para comprobar esta idea, analizamos el comportamiento territorial y reproductor de Pseudolestes mirabilis (Zygoptera, Pseudolestidae), una damisela endemica de la isla de Hainan, en China, y el unico representante de su familia. Nuestra hipotesis era que la singularidad de este taxon seria evidente en su comportamiento. Encontramos que los combates agonisticos entre machos fueron generalmente muy cortos (menos de 2 min) y consistieron en un vuelo de presentacion cara a cara a una distancia cercana usando unicamente las alas anteriores. Ningun otro odonato vuela solo con dos alas en luchas territoriales. Ademas, una pequena proporcion de las peleas se intensifico y duro alrededor de una hora; en estas peleas los machos mostraron de forma evidente sus alas posteriores coloreadas. Los machos tambien se enfrentaron de manera similar, aunque durante poco tiempo, a las avispas (Eustenogaster nigra) que utilizaron el mismo microhabitat. El hecho de que se encontraran pocas hembras limito la frecuencia de copula, lo que determino que la mayoria de los machos no se apareara durante todo el dia. A diferencia de lo que cabria esperar para una libelula con alas coloreadas, el cortejo anterior a la copula fue practicamente inexistente, lo que sugiere que la seleccion intrasexual esta detras de la evolucion de las alas coloreadas en esta especie. La copula duro un promedio de siete minutos y estuvo compuesta por una primera etapa de eliminacion del esperma de los rivales (64% de esperma retirado) y una segunda etapa de inseminacion. De acuerdo con nuestra hipotesis inicial, el comportamiento de copula fue unico: los machos no transfirieron el esperma a su vesicula antes de cada apareamiento, sino que lo hicieron despues de la copula, un comportamiento que no se puede explicar facilmente. Estas caracteristicas exclusivas apuntan a la importancia de esta especie como taxon excepcional que merece una alta prioridad de conservacion. EnglishTaxonomically isolated species may contribute unique characters to biological diversity, particularly at the level of ethodiversity. To test this idea, we analysed the territorial and reproductive behaviour of Pseudolestes mirabilis (Zygoptera, Pseudolestidae), an endemic damselfly from Hainan island, China, and the only representative of its family. Our hypothesis was that the uniqueness of this taxon would be evident in its behaviour. We found that the agonistic encounters between males were usually very short (less than 2 min) and consisted of a face–to–face display with both males maintaining a close distance while flying using only the forewings. No other odonate flies with only two wings in territorial contests. Furthermore, a small proportion of fights were escalated and lasted about one hour, with clear exhibition of the coloured hindwings. Males also confronted wasps (Eustenogaster nigra) that used the same microhabitat in a similar way, albeit for short time. Females were found in low numbers. This limited copulatory frequency and most males did not mate in the whole day. Unexpectedly for a damselfly with coloured wings, precopulatory courtship was almost absent, suggesting that intrasexual selection is behind the evolution of coloured wings in this species. Copulation lasted an average of seven minutes, with a first stage of rivals’ sperm removal (64% of sperm removed) and a second stage of insemination. In agreement with our initial hypothesis, copulatory behaviour was unique: males did not translocate sperm to their vesicle before each mating but translocated sperm after copulation, a behaviour that cannot be easily explained. These exclusive characteristics point to the relevance of this species as an exceptional taxon that merits high conservation priority.

Ethological uniqueness of a damselfly with no near relatives: the relevance of behaviour as part of biodiversity