The discovery of a new population of the non-marine heterotardigrade Novechiniscus armadilloides from Utah, USA, allowed us to re-analyze the species by means of scanning electron microscopy and differential interference contrast microscopy. This analysis confirmed the presence of bar-shaped, unpaired segmental plates and of a long filament E, other than the filament A always present in the class Heterotardigrada. It also provided additional information on characters not explicitly cited in the previous descriptions of this monotypic genus, such as details of the head cirri and clavae, details of the buccal tube and of the pharyngeal bulb, sculpture of the dorso-lateral and leg plates, details of the claws. The population is bisexual, but no secondary sexual dimorphism was observed. The male and female gonopore were described. New characters such as red eyes and red body color were used in analyzing the phylogeny of the family Echiniscidae. The phylogeny and biogeography of non-marine heterotardigrades provide intriguing questions for further research.
A new discovery of Novechiniscus armadilloides (Schuster, 1975) (Tardigrada, Echiniscidae) from Utah, USA with considerations on non-marine Heterotardigrada phylogeny and biogeography / Rebecchi, Lorena; Altiero, Tiziana; E., Jacobsen; Bertolani, Roberto; R. M., Kristensen. - In: ORGANISMS DIVERSITY & EVOLUTION. - ISSN 1439-6092. - STAMPA. - 8:1(2008), pp. 58-65. [10.1016/j.ode.2006.11.002]