Abstract
The Sierra Nevada de Santa Marta (SNSM) is a mountain range in northern Colombia, recognized for its high biological richness. To date, the existence of 27 species of tardigrades is known for this particular region. Morphological and morphometric analysis of 51 specimens, found in 16 samples of bryophytes and lichens collected at the SNSM, and deposited in the tardigrade collection of the "Centro de Colecciones Científicas de la Universidad del Magdalena" between 2011 and 2016 was carried out. The species Mixibius gibbosus sp. nov. is described based on the following main traits: presence of gibbosities (up to date never reported for any species of the genus Mixibius), isodiametric tubercles and relevant morphometric differences with respect to the most similar congeneric species. Additionally, the species Diphascon pingue pingue sensu lato, Hypsibius cf. allisoni and Adropion onorei are, for the first time, recorded for Colombia and the latter is recorded for the first time out of Ecuador. All records are new for the SNSM.
Highlights
In the last decade, the number of scientific publications with descriptions of species and records of tardigrades has increased markedly in South America
As a result of reviewing some of the material in this collection, the aim of the present study is to describe a new species of the genus Mixibius Pilato, 1992 and to add new species records of Adropion Pilato, 1987, Diphascon Plate, 1888, Fractonotus Pilato, 1998 and Hypsibius Ehrenberg, 1848 genera, found in bryophytes and lichens collected in the northwestern side of the Sierra Nevada de Santa Marta (SNSM)
The photographic and morphometric work for the Colombian material was carried out using a Phase Contrast Microscope (PCM) Zeiss Axiolab A1 with an adapted digital camera Zeiss AxioCam ERc5s and the software Zeiss Zen 2.3 (Blue edition)
Summary
The number of scientific publications with descriptions of species and records of tardigrades has increased markedly in South America. 9 species (Bryodelphax kristenseni, Crenubiotus revelator, Doryphoribius rosanae, Itaquascon pilatoi, Meplitumen aluna, Milnesium kogui, Minibiotus pentannulatus, Paramacrobiotus lachowskae, Pam. sagani) have been described, and 18 have been recorded, for. Minibiotus pseudostellarus Roszkowska, Stec, Ciobanu & Kaczmarek, 2016 Bryodelphax kristenseni Lisi Daza, Londoño & Quiroga, 2017 Crenubiotus revelator Lisi, Londoño & Quiroga, 2020 Doryphoribius rosanae Daza, Caicedo, Lisi & Quiroga, 2017 Itaquascon pilatoi Lisi, Londoño & Quiroga, 2014 Meplitumen aluna Lisi, Daza, Londoño, Quiroga & Pilato, 2019. Colombia is one of the countries in which knowledge of the biodiversity of tardigrades has increased most rapidly, going from 30 known species in 2009 to 59 by 2020 (Caicedo et al 2014, Lisi et al 2014a, 2017, 2019, 2020, Melo et al 2015, Stec et al 2018, Daza et al 2017, Londoño et al 2015, 2017). 9 species (Bryodelphax kristenseni, Crenubiotus revelator, Doryphoribius rosanae, Itaquascon pilatoi, Meplitumen aluna, Milnesium kogui, Minibiotus pentannulatus, Paramacrobiotus lachowskae, Pam. sagani) have been described, and 18 have been recorded, for
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