2 literature references for Macrobiotus meridionalis Richters, 1909:

Author: Guidetti, Roberto, and Roberto Bertolani
Year: 2005
Title: Tardigrade taxonomy: an updated check list of the taxa and a list of characters for their identification
Source: Zootaxa, issue 845
Author: Thulin, Gustav
Year: 1928
Title: Über die Phylogenie und das System der Tardigraden
Source: Hereditas, vol. 11