Review of North American Verrucoentomon species (Protura: Acerentomidae, Nipponentominae), with a key to species of the related genus Imadateiella Rusek
Keywords:
redescription, chaetotaxy, porotaxy, Alaska, northern CanadaAbstract
Type material of 3 North American Verrucoentomon (Protura: Acerentomidae, Nipponentominae) species was studied: Verrucoentomon imadatei Nosek, 1977 from Alaska, Verrucoentomon mixtum Nosek, 1981 from Alaska and Verrucoentomon canadensis (Tuxen, 1955) from northern Canada. Additional morphological characters for V. imadatei and V. canadensis are provided. Verrucoentomon mixtum is redescribed and transferred to the genus Imadateiella Rusek, 1974 due to the presence of 4 pairs of A-setae on the metanotum rather than 3 and the absence of teeth on the hind margins of segments IX–XI. Imadateiella mixta (Nosek, 1981) is characterized by the presence of P1a setae on tergites I–VII, 4 A-setae on tergite VIII and only 4 setae on sternite VIII. The species is unique within the Nipponentominae in having only one long terminal spine on the labial palp. Imadateiella is redefined and a key to its species is provided.
Resumen
Se estudió el material tipo de tres especies de Verrucoentomon de América del Norte: V. imadatei del estado de Alaska, V. mixtum de Alaska y V. canadensis del norte de Canadá. Se aportan caracteres morfológicos adicionales para V. imadatei y V. canadensis. Se re-describe Verrucoentomon mixtum y se transfiere al género Imadateiella debido a la presencia de cuatro pares de setas- A sobre el metanoto en lugar de tres y por la ausencia de dientes en los márgenes posteriores de los segmentos IX-XI. Se caracteriza Imadateiella mixtum por la presencia de setas P1a en los tergitos I-VII, 4 setas- A en el tergito VIII y sólo 4 setas en el esternito VIII. La especie es única entre las Nipponentominae por tener una sóla espina terminal larga en el palpo labial. Se re-define el género Imadateiella y se aporta una clave de sus especies.
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