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Appendix Morphometric parameters of Chaetonotus (Chaetonotus) antrumus Kolicka sp. nov. Abbreviations: N = number of specimens or structures analysed; Range = the smallest and the largest structure measurement found among all specimens measured; SD = standard deviation. All measurements are given in micrometers (μm); all indicators are given as a percentage (%) and italicized. in A new species of freshwater Chaetonotidae (Gastrotricha, Chaetonotida) from Obodska Cave (Montenegro) based on morphological and molecular characters
Appendix Morphometric parameters of Chaetonotus (Chaetonotus) antrumus Kolicka sp. nov. Abbreviations: N = number of specimens or structures analysed; Range = the smallest and the largest structure measurement found among all specimens measured; SD = standard deviation. All measurements are given in micrometers (μm); all indicators are given as a percentage (%) and italicized.
Fig. 38 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 38. Chaetonotus (Hystricochaetonotus) arcanus sp. nov., holotype (CU-FNS-29-09-20/HO), differential interference contrast. A. Dorsal trunk scales and spines. Arrows mark lateral denticles. B. Body overview. C. Head scales. D. Adhesive tubes curved underneath trunk. E. Mouth and boomeranglike hypostomial plate. Scale bars: A, D = 10 µm; B = 30 µm; C, E = 2 µm.
Fig. 33 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 33. Chaetonotus (Hystricochaetonotus) gulosus sp. nov. A. Dorsal overview showing the scale and spine pattern. B. Ventral overview showing the scale and ciliary pattern. Scale bar = 30 µm.
Fig. 36 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 36. Chaetonotus (Hystricochaetonotus) gulosus sp. nov., paratype (CU-FNS-28-10-19/PA), differential interference contrast. A. Scales of the ventral interciliary field. B. Dorsal trunk scales. C. Detail of the posterior body region. D. Posterior ventral keeled and spined scales. Scale bars: A, D = 5 µm; B–C = 10 µm.
Fig. 18 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 18. Chaetonotus (Hystricochaetonotus) optabilis sp. nov. A. Dorsal overview showing the scale and spine pattern. B–C. Details showing the distribution of head and trunk scales. D–E. Head and trunk scales, the schematic drawing of the scale base is shown above that of spined scales. F. Lateral view of a trunk spined scale. G. Dorsal furcal scales. Scale bar = 30 µm.
Fig. 15 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 15. Chaetonotus (Hystricochaetonotus) superbus sp. nov. A, H. Dorsal and lateral overviews showing the scale and spine pattern. B. Head scale. C. Neck scale. D. Trunk scale. E. Ventral scales. F. Upperfurcal dorsal scales. G. Lateral view of a trunk spined scale. I. Lateral view showing the connection of a transversal band to the base of a scale. J. Lateral overview showing the internal morphology. K. Lateral view of the anterior body region. Scale bars = 30 µm.
Fig. 24 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 24. Chaetonotus (Hystricochaetonotus) avarus sp. nov. A. Ventral overview showing the scale and ciliary pattern. B. Mouth region. C. Detail showing the transition region of two scale types in the interciliary field. D–E. Ventrolateral three-lobed scales. F. Ventral furcal three-lobed scales. G. Furcal cordiform scales. H. Detail of the terminal ventral region. Scale bars: A = 30 µm; H = 10 µm.
Fig. 12 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 12. Chaetonotus (Hystricochaetonotus) mirabilis sp. nov., holotype (CU-FNS-11-09-19/HO), differential interference contrast. A‒B. Optical sections showing the general body organization. C. Lateral overview. Arrows in (B) and (C) mark the lateral denticle of spines. Scale bars = 30 µm.
Fig. 10 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 10. Chaetonotus (Hystricochaetonotus) mirabilis sp. nov. A‒B. Dorsal and lateral overviews showing the scale and spine pattern. C. Detail showing the cuticular teeth protruding from the mouth ring. D. Elongated dorsal spines with a membrane. E. Terminal dorsal spines. F. Internal morphology of a strongly squeezed specimen (body shape hence not representative). G. Ventral overview. Scale bars: A = 30 µm; F–G = 20 µm.
Fig. 20 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 20. Chaetonotus (Hystricochaetonotus) optabilis sp. nov., differential interference contrast. A. Paratype (CU-FNS-05-03-20-3/PA-2). B–C. Holotype (CU-FNS-05-03-20-1/HO). A. Overview showing the general body organization. Asterisks mark the beginning of the ventral ciliary bands. B‒C. Surface views, showing the head and trunk scale patterns. Scale bars: A = 30 µm; B = 5 µm; C = 10 µm.
Fig. 8 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 8. Phylogenetic tree based on 18S, 28S, and COI sequences, showing the systematic positions of the Chaetonotus (Hystricochaetonotus) cluster (arrow). This clade is collapsed in the three, highlighted in the inset phylogram, and presented in detail in Fig. 9. ML bootstrap values and posterior probabilities were mapped onto the best ML tree.
Fig. 29 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 29. Chaetonotus (Hystricochaetonotus) luxus sp. nov. A. Ventral overview showing the scale and ciliary pattern. B. Ventrolateral scale. C. Ventral furcal scale. D. Internal morphology. E. Detail of the ventral terminal body region. Scale bars: A = 30 µm; D = 20 µm; E = 10 µm.
Fig. 7 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 7. Secondary structure of the first two domains of the 5.8‒28S rRNA molecule of Chaetonotus (Hystricochaetonotus) mirabilis sp. nov. Diagnostic molecular autapomorphies are marked by red arrows. The reference 28S secondary structure map of Saccharomyces cerevisiae Meyen ex E.C.Hansen (inset) is from http://apollo.chemistry.gatech.edu/RibosomeGallery (Petrov et al. 2014).
Fig. 6. ITS2 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 6. ITS2 of the subgenus Hystricochaetonotus Schwank, 1990. A. Putative consensus secondary structure. The central loop radiates four unequally long helices. The first two helices are highly conserved, while the two following helices are much less conserved. For localization of helix 10, which is made by the interaction of 3'-end of 5.8S and 5'-end of 28S, see Fig. 7. B. Two different views on the tertiary structure, showing that helices II and IV run in parallel. C. Structure logos of helices I‒IV. The height of a base is proportional to its frequency in the multiple sequence alignment.
Fig. 5 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 5. Secondary structure of the 18S rRNA molecule of Chaetonotus (Hystricochaetonotus) mirabilis sp. nov. The single diagnostic molecular autapomorphy (red arrow) is situated in the terminal loop of helix 21es6c in the V4 region of the C domain. Note the long-range tertiary contacts between the V2 and V4 regions (highlighted in pink). The reference 18S secondary structure map of Saccharomyces cerevisiae Meyen ex E.C.Hansen (inset) is from http://apollo.chemistry.gatech.edu/RibosomeGallery (Petrov et al. 2014).
Fig. 32 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 32. Chaetonotus (Hystricochaetonotus) iratus sp. nov., holotype (CU-FNS-21-09-20/HO), differential interference contrast. A. Overview showing the internal morphology. B. Pharynx. C. Mouth. D. Head scales. E. Detail showing the posterior section of the pharynx, the pharyngeal-intestinal junction, and the differentiated anterior section of the intestine. F. Detail of the mouth region. Arrows mark the hypostomial structures, asterisks mark the beginning of ciliary bands. Scale bars: A = 30 µm; B = 10 µm; C–D = 2 µm; E–F = 5 µm.
Fig. 4 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 4. Histograms showing intra- and interspecies p-distances of four molecular markers studied in nine new gastrotrich species. A. Barcoding analysis of 18S rRNA gene sequences. The black arrow marks the overlap between intra- and interspecies p-distances. B. Barcoding analysis of ITS2 molecules. Sequences are identical within species (red arrow), while interspecies p-distances range from 5.88% to as much as 34.76%. C. Barcoding analysis of the first two domains of 28S rRNA gene. Although there is no overlap between intra- and interspecies p-distances, no distinct barcoding gap is recognizable. D. Barcoding analysis of COI showing the distinct gap between intra- and interspecies p-distances (red arrow).
Fig. 14 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 14. Chaetonotus (Hystricochaetonotus) mirabilis sp. nov., differential interference contrast. A–B, E. Paratype (CU-FNS-25-10-19/PA-1). C–D, F–G. Paratype (CU-FNS-02-10-19/PA-2). A. Dorsal view showing the scale and spine pattern. B. Head scales. C. Neck and upper trunk dorsolateral scales. D. Terminal dorsal trunk scales with a lateral denticle (arrows). E. Ventral ciliary bands. White dashed lines mark upper-furcal scales. F. Lateral trunk scales. G. Dorsal trunk spines with a membrane. White double arrowheads mark the highly refractive bodies in the intestine. Scale bars: A = 30 µm; B–F = 5 µm; G = 10 µm.
Fig. 11 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 11. Scales of Chaetonotus (Hystricochaetonotus) mirabilis sp. nov. A. Head lateral scales. B. Head dorsal scales. C. Neck dorsal scales. D. Trunk lateral scale. E. Trunk dorsolateral scale. F. Trunk dorsal scale. G. Terminal dorsal scale. H. Furcal ventral three-lobed scales. I. Furcal ventral oblong scales.
Fig. 28 in A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Central Europe
Fig. 28. Chaetonotus (Hystricochaetonotus) luxus sp. nov. A, H. Dorsal and lateral overviews showing the scale and spine pattern. B. Head scale. C. Neck and upper-trunk scale. D–E. Frontal and lateral views of a trunk spined scale. F. Posterior trunk scale. G. Dorsal furcal scale. Scale bars = 30 µm.
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