Chaetonotus (Chaetonotus) polyspinosus Greuter, 1917 (Table 11) Locality: Site 2, 3; session I, II, III. Material: 33 specimens (27 adult and 5 juvenile), 30 specimens photographed. Remarks: A very varied species with various morphological forms described by Kisielewski (1991). The specimens from the Poznań Palm House only partially (17 from all 30 measured specimens) fit into the ranges of the ones previously reported in the literature data. A part of the observed specimens have a different total number of longitudinal alternating rows (50–58 vs 38–47 given) and thus a different ratio of scales distribution (from 88.1% vs from 94%), and a and m pharynx formulas are lower than the reference (from 21.6% and 17.4% vs from 25% and 21%, respectively). The majority of specimens have longer neck and trunk scales (up to 7.7 Μm and up to 9.9 Μm vs up to 4 Μm and up to 7 Μm, respectively), and longer straight spines on the base of the furca (up to 23.3 Μm vs up to 18 Μm). However, it cannot be questioned that all of the recorded specimens belong to the species C.(C.) polyspinosus.

Published as part of Kolicka, Małgorzata, Kisielewski, Jacek, Nesteruk, Teresa & Zawierucha, Krzysztof, 2013, Gastrotricha from the Poznań Palm House — one new subgenus and three new species of freshwater Chaetonotida (Gastrotricha), pp. 231-279 in Zootaxa 3717 (2) on page 262, DOI: 10.11646/zootaxa.3717.2.7, http://zenodo.org/record/246596