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Género Lestes Clave De Especies Ref:Odo.13 (01/03/15)

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Género Lestes Clave De Especies Ref:Odo.13 (01/03/15) Género Lestes Clave de especies Ref:Odo.13 (01/03/15) Lestes: Género de los llamados “caballitos del diablo” (Zygoptera, Odonata) que se caracterizan por posarse casi siempre con las alas extendidas. Presentan coloración metálica, a menudo con alguna parte pruinosa azul en los machos y pterostigmas rectangulares notables. En la Península se encuentran citadas seis especies. Lestes barbarus Nota: la presente clave no es válida para individuos recién emergidos, en que la coloración no ha empezado a desarrollarse. A pesar de que las especies se pueden identificar con caracteres macroscópicos bien definidos, el género Lestes Leach, 1815 no es tan sencillo como parece inicialmente y las características descritas deben aplicarse con precaución, así como comprobar los caracteres secundarios que se indican en cada caso para confirmar la identificación. 1.- (1a) Pterostigmas de color pardo claro. Lateral del tórax con una marca distintiva en forma de cuña. Machos con apéndices anales claros.......................................................................................................Lestes viridis (Vander Linden, 1825) Foto 1: Lestes viridis, macho. Se señalan los pterostigmas de color Foto 2: Lestes viridis, macho. Se señalan la marca en forma de cuña pardo pálido (a) y los apéndices anales claros (b). del lateral del tórax (a) y los pterostigmas pardo pálido (b). Foto 3: Lestes viridis, hembra. Se señalan los pterostigmas de color Foto 4: Lestes viridis, hembra. Se señalan la marca en forma de pardo pálido. cuña del lateral del tórax (a) y los pterostigmas pardo pálido. 1 Género Lestes Clave de especies Ref:Odo.13 (01/03/15) (1b) Pterostigmas oscuros o bicolores. Marca en forma de cuña ausente...........................................................................2 2.- (2a) Banda antehumeral reducida o prácticamente inexistente. Pterostigmas completamente oscuros en los adultos, si bien pueden estar bordeados distal y proximalmente por una vena blanca..................................................................................3 Foto 5: Lestes sponsa, macho. Se aprecian la ausencia de banda Foto 6: Lestes dryas, macho. Se aprecian la ausencia de banda antehumeral (a) y los pterostigmas oscuros (b). antehumeral (a) y los pterostigmas completamente oscuros (b). Foto 7: Lestes dryas, hembra. Se aprecian las venas blancas que Foto 8: Lestes sponsa, macho. Se aprecian las venas blancas que bordean, distal y proximalmente, el pterostigma. bordean, distal y proximalmente, al pterostigma. 2 Género Lestes Clave de especies Ref:Odo.13 (01/03/15) (2b) Banda antehumeral presente, más o menos ancha. Pterostigmas bicolores................................................................7 Foto 9: Lestes barbarus, macho. Se señalan la banda antehumeral Foto 10: Lestes virens, hembra. Se aprecian claramente la banda (a) y los pterostigmas bicolores (b). antehumeral (a) y los pterostigmas bicolores (b). Comparar con las fotos 7 y 8. 3.- (3a) Ejemplares grandes y muy oscuros. Pterostigmas muy grandes. Individuos maduros con pruinosidad azul cubriendo cabeza, tórax y segmentos S1-S2 y S8-S10 del abdomen...........................................Lestes macrostigma (Eversmann, 1836) Foto 11: Lestes macrostigma, macho. Se señalan los grandes Foto 12: Lestes macrostigma, hembra. Se aprecian los grandes pterostigmas oscuros (a), y la pruinosidad azul en S1-S2 (b), y en pterostigmas (a), y la pruinosidad azul presente en cabeza, tórax y S8-S10 (c). segmentos abdominales S1-S2 (a) y S8-S10 (b). (3b) Sin estos caracteres......................................................................................................................................................7 3 Género Lestes Clave de especies Ref:Odo.13 (01/03/15) 4.- (4a) Presencia de genitalia secundaria y de apéndices anales (los superiores alargados y curvados hacia dentro). Pruinosidad azul ausente o presente únicamente en los segmentos S1-S2 y S9-S10.................................................(machos) 5 Foto 13: Lestes dryas, macho inmaduro. Se señalan la presencia de Foto 14: Lestes sponsa, macho. Se aprecia la presencia de genitalia genitalia secundaria (a), y de pruinosidad en los segmentos S1 (b) y secundaria (a) y la pruinosidad de los segmentos S1-S2 (b), y S9- S9-S10 (c). En S2 todavía se está desarrollando. S10 (c). (4b) Ausencia de genitalia secundaria y de apéndices anales. Presencia de ovopositor. Sin pruinosidad azul.................... …..................................................................................................................................................................................(Hembras) 6 Foto 15: Lestes dryas, hembra. Se aprecia la ausencia de genitalia Foto 16: Lestes dryas, hembra. En vista dorsal no se aprecia la secundaria (a), de cercoides (b) y la presencia de ovopositor (c). ausencia de genitalia secundaria ni la presencia de ovopositor, pero se identifica como hembra por la ausencia de apéndices anales alargados y curvados (cercoides). 4 Género Lestes Clave de especies Ref:Odo.13 (01/03/15) 5.- (5a) La pruinosidad de S2 cubre todo el segmento. Apéndices anales inferiores rectos y estrechos.................................... …...........................................................................................................................Macho de Lestes sponsa (Hansemann, 1823) Foto 17: Lestes sponsa, macho. Se señalan los pterostigmas Foto 18: Lestes sponsa, macho. Se señalan los pterostigmas oscuros (a) y la pruinosidad en S1-S2 (b) y en S9-S10 (c). oscuros (a) y la pruinosidad en S1-S2 (b) y en S9-S10 (c). (5b) La pruinosidad azul de S2 cubre sólo la primera mitad del segmento. Apéndices anales inferiores terminados en curva, y con un ensanchamiento apical (como un “palo de golf”)..........................................Macho de Lestes dryas Kirby, 1890 Foto 19: Lestes dryas, macho. Se señala la pruinosidad azul (aún no Foto 20: Lestes dryas, macho. Se aprecia cómo la pruinosidad azul totalmente desarrollada) que cubre completamente S1 (a), y sólo sólo cubre parcialmente el segmento S2. parcialmente S2 (b). Nota: hay que tener precaución a la hora de separar los machos que no son totalmente adultos de Lestes sponsa y Lestes dryas, ya que los Lestes sponsa que no han desarrollado totalmente la pruinosidad pueden confundirse con Lestes dryas. En estos casos, la forma más fiable de separarlos es mediante los apéndices anales inferiores, como se aprecia en las dos siguientes fotografías. 5 Género Lestes Clave de especies Ref:Odo.13 (01/03/15) Foto 21: Lestes sponsa, macho. Se aprecian los apéndices anales Foto 22: Lestes dryas, macho inmaduro. Se señala la ausencia de inferiores rectos y estrechos, característicos de esta especie. pruinosidad azul en S1-S2, por ser inmaduro (a), pero los pterostigmas oscuros (b) y los apéndices anales con la punta ensanchada (c) lo identifican como Lestes dryas. 6.- (6a) Protórax con laterales metálicos, de color verde en individuos maduros. El extremo del ovopositor supera el segmento S10......................................................................................................................Hembra de Lestes dryas Kirby, 1890 Foto 23: Lestes dryas, hembra. Se señalan los laterales verde Foto 24: Lestes dryas, hembra. Se señalan los laterales verde metálico del protórax (a), y los pterostigmas oscuros (b). metálico del protórax (a), y los pterostigmas oscuros (b). 6 Género Lestes Clave de especies Ref:Odo.13 (01/03/15) (6b) Protórax con laterales no metálicos. El extremo del ovopositor no sobrepasa el segmento S10.................................. ….........................................................................................................................Hembra de Lestes sponsa (Hansemann, 1823) Foto 25: Lestes sponsa, hembra. Se señalan los laterales del Foto 26: Lestes sponsa, hembra. Se señalan los laterales del protórax no metálicos (a) y los pterostigmas oscuros (b). protórax no metálicos (a) y los pterostigmas oscuros (b). En vista lateral, un detalle del ovopositor permite diferenciar las hembras de estas dos especies por la longitud relativa entre el final del ovopositor y el final del segmento S10 del abdomen: Foto 27: Lestes sponsa, detalle del ovopositor. Se aprecia cómo el Foto 28: Lestes dryas, detalle del ovopositor. Se aprecia cómo el ovopositor (a), no sobrepasa la longitud del segmento S10 (b). extremo del ovopositor (a) sobrepasa el extremo de S10 (b). 7 Género Lestes Clave de especies Ref:Odo.13 (01/03/15) 7.- (7a) Pterostigmas con la mitad proximal oscura y la mitad apical clara. Laterales del final del abdomen pálidos en vista dorsal. Machos sin pruinosidad, o con pruinosidad muy leve en S10......................................Lestes barbarus (Fabricius, 1798) Foto 29: Lestes barbarus, macho. Se señalan los pterostigmas con Foto 30: Lestes barbarus, macho. Se señalan los pterostigmas con la mitad apical clara (a), los laterales del final del abdomen claros la mitad distal clara (a) y los laterales del final del abdomen claros (b), y la pequeña mancha de pruinosidad en S10 (c). también (b). Foto 31: Lestes barbarus, hembra. Se señalan los pterostigmas con Foto 32: Lestes barbarus, hembra. Se señalan los pterostigmas con la mitad distal clara (a) y los laterales del final del abdomen también la mitad distal clara (a) y los laterales del final del abdomen también claros (b). claros (b). 8 Género Lestes Clave de especies Ref:Odo.13 (01/03/15) (7b) Pterostigmas pardos en la parte central, y claros en los extremos. Macho maduro
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