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DESCRIPTION OF ILYOCRYPTUS NEVADENSIS (BRANCHIOPODA, ANOMOPODA), A NEW SPECIES FROM A HIGH ALTITUDE CRATER LAKE IN THE VOLCANO NEVADO DE TOLUCA, MEXICO

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[A new species of a cladoceran from a crater-lake, located at 4120 m a.s.l. in the volcano Nevado de Toluca, Mexico, is here described. It belongs to the genus Ilyocryptus, and is distinguished mainly by a combination of features, including an incomplete moulting; the anal opening is located on the distal end of the postabdomen, which is armed with moveable lateral spines along most of its length; and with no lobe formation. The shell bears bifurcate defensive spines. This record constitutes the first find of an ilyocryptid in a high altitude crater-lake. This record also increases the number of species known from Mexico to three, and to nine in the New World. Most of the American forms differ from the European ones, such confirming again the non-cosmopolitanism of most of these cladocerans.

Se describe una nueva especie de cladócero procedente de un lago cráter, localizado a 4120 metros sobre el nivel del mar en el volcán Nevado de Toluca, México. Pertenece al género Ilyocryptus y se distingue principalmente por una combinación de características que incluyen una muda incompleta; la abertura del ano localizada en el lado distal del postabdomen, el cual se encuentra armado con espinas móviles laterales a lo largo de la mayor parte de su longitud y sin formación de lóbulos dorsales. En la concha se observan espinas defensivas bifurcadas. Estos organismos constituyen el primer registro de un iliocríptido en un lago cráter de gran altitud e incrementan el número de especies conocidas para México a tres. En el caso del nuevo mundo alcanza nueve, la mayoría de ellas diferentes a las europeas, por lo que se confirma una vez más el no cosmopolitanismo de la mayoría de estos cladóceros., A new species of a cladoceran from a crater-lake, located at 4120 m a.s.l. in the volcano Nevado de Toluca, Mexico, is here described. It belongs to the genus Ilyocryptus, and is distinguished mainly by a combination of features, including an incomplete moulting; the anal opening is located on the distal end of the postabdomen, which is armed with moveable lateral spines along most of its length; and with no lobe formation. The shell bears bifurcate defensive spines. This record constitutes the first find of an ilyocryptid in a high altitude crater-lake. This record also increases the number of species known from Mexico to three, and to nine in the New World. Most of the American forms differ from the European ones, such confirming again the non-cosmopolitanism of most of these cladocerans.

Se describe una nueva especie de cladócero procedente de un lago cráter, localizado a 4120 metros sobre el nivel del mar en el volcán Nevado de Toluca, México. Pertenece al género Ilyocryptus y se distingue principalmente por una combinación de características que incluyen una muda incompleta; la abertura del ano localizada en el lado distal del postabdomen, el cual se encuentra armado con espinas móviles laterales a lo largo de la mayor parte de su longitud y sin formación de lóbulos dorsales. En la concha se observan espinas defensivas bifurcadas. Estos organismos constituyen el primer registro de un iliocríptido en un lago cráter de gran altitud e incrementan el número de especies conocidas para México a tres. En el caso del nuevo mundo alcanza nueve, la mayoría de ellas diferentes a las europeas, por lo que se confirma una vez más el no cosmopolitanismo de la mayoría de estos cladóceros.]

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/content/journals/10.1163/156854000504408
2000-03-01
2016-12-11

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