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FIGURE 6 in Two new species of Oregodasys (Gastrotricha: Macrodasyida: Thaumastodermatidae) from Carrie Bow Cay, Belize with ultrastructural observations of the epidermal glandular system

FIGURE 6. Ultrastructure of the bodywall of Oregodasys katharinae sp. nov. A Section through the dorsal epidermis (ep) at the level of the pharynx (ph). B Closeup of the apical region of the dorsal epidermis showing rod-like secretory inclusions (rd) below the plasma membrane. A single electron-dense element (ede) is present within the endocuticle. C Longitudinal section through two adjacent epidermal glands showing the apical pore (po) and numerous secretory vesicles (sv) with different staining characterstics. D Apical end of an epidermal gland showing the microvillar collar (mv) that forms the apical pore. The overlying exocuticle (ex) and endocuticle (ed) are generally thickest around the papillary glands. Note the presence of a portion of a striated rootlet (sr) at the base of the photograph. E Section through an insunk epidermal gland. Note the elongate gland neck (gn) between epidermal cells that leads to a small pore (po). Electron-dense elements are abundant in the endocuticle around insunk epidermal glands. F Longitudinal section through a portion of a papilla that contains two cell types: a porous cell with an apical opening and large nucleus (nu) on the left, and a sensory cell with a striated rootlet (sr) and apical cilium (out of the field of view) on the right.

FIGURE 1 in Two new species of Oregodasys (Gastrotricha: Macrodasyida: Thaumastodermatidae) from Carrie Bow Cay, Belize with ultrastructural observations of the epidermal glandular system

FIGURE 1. Habitus of Oregodasys norenburgi sp. nov., multiple specimens. A Dorsal view. Inset: closeup of a papilla containing secretory vesicles. B Dorsal view of head region showing ocelli (oc). C DIC image of the ventral mouth (mo) margin showing the anterior adhesive tubes (TbA). D Dark-field image of the midgut region showing several ova (ov) and numerous diatom frustules (di). E DIC image of the posterior pedicles (pd), ventral view. Lateral adhesive tubes (TbL) are present on either side of the pedicles that bear the posterior adhesive tubes (TbP); locomotory cilia (ci) and ventrolateral adhesive tubes (TbVL) are also shown.

FIGURE 4 in Two new species of Oregodasys (Gastrotricha: Macrodasyida: Thaumastodermatidae) from Carrie Bow Cay, Belize with ultrastructural observations of the epidermal glandular system

FIGURE 4. Oregodasys katharinae sp. nov., transmitted light images of the holotype after resin impregnation. A Dorsal view showing numerous epidermal glandulocytes (eg) and one-half of the caudal organ (co). B Ventral view showing the oral hood (oh), mouth region (mo), pharynx (ph), singular testis (te) and bipartite caudal organ.

FIGURE 3 in Two new species of Oregodasys (Gastrotricha: Macrodasyida: Thaumastodermatidae) from Carrie Bow Cay, Belize with ultrastructural observations of the epidermal glandular system

FIGURE 3. Habitus of Oregodasys katharinae sp. nov. A Ventral view showing lateral adhesive tubes (TbL) on the posterior body margin, and posterior adhesive tubes (TbP). B Closeup of the anterior end, ventral view, showing the mouth (mo), anterior adhesive tubes (TbA) and ventrolateral adhesive tubes (TbVL). C Closeup of the lateral body wall showing the triangle-shaped papillae (tp) and blunt papillae (bp). D Closeup of a triangular papilla from a specimen that was made into a permanent wholemount. The vesicles of the underlying glandulocyte stained darkly after osmium tetroxide fixation.

FIGURE 2 in Two new species of Oregodasys (Gastrotricha: Macrodasyida: Thaumastodermatidae) from Carrie Bow Cay, Belize with ultrastructural observations of the epidermal glandular system

FIGURE 2. Oregodasys norenburgi sp. nov. A Dorsal view of an adult as seen from below: mature ova (ov); posterior adhesive tubes (TbP). B Ventral view of an adult as seen from below: caudal organ (co); ocelli (oc); anterior adhesive tubes (TbA); lateral adhesive tubes (TbL); ventrolateral adhesive tubes (TbVL); testis (te).

FIGURE 17. Haltidytes crassus. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 17. Haltidytes crassus. A) Dorsal view. B) Ventral view showing insertion of spines. Scale bars: A and B, 20 µm.

FIGURE 8. Heterolepidoderma macrops. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 8. Heterolepidoderma macrops. A) Habitus. B) Shape of pharynx and ocellar granules. C) Dorsal view of posterior trunk region showing distribution of scales. Scale bars: A, 20 µm; B, 15 µm; C, 10 µm.

FIGURE 5. Aspidiophorus tetrachaetus. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 5. Aspidiophorus tetrachaetus. A) Ventral view. B) Dorsal view of scales and spines of posterior trunk region. C) Shape of pharynx. Scale bars: A, 20 µm; B and C, 10 µm.

FIGURE 4. Aspidiophorus squamulosus. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 4. Aspidiophorus squamulosus. A) Habitus. B) Pharynx with cuticular reinforcements. C) Dorsal view of the furcal base showing distribution of scales and spines. Scale bars: A, 50 µm; B, 20 µm; C, 10 µm.

FIGURE 9. Heterolepidoderma ocellatum. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 9. Heterolepidoderma ocellatum. A) Habitus, arrowheads indicate spermatozoa. B) Dorsal view, showing distribution of scales. Scale bars: 15 µm.

FIGURE 1 in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 1. Map of Sweden showing the localities sampled in this study and by Kånneby et al. (2009). 1) Åhus, Skåne; 2) Nybro, Småland; 3) Islandsberg, Bohuslän; 4) Fiskebäckskil, Bohuslän; 5) Hållö and Skarvesäter, Bohuslän; 6) Saltö, Bohuslän; 7) Askö, Södermanland; 8) Lower Lake Rudan, Södermanland; 9) Runmarö, Stockholm archipelago; 10) Bergianska trädgården, Stockholm; 11) Lake Trösvattnet, Västmanland; 12) Lake Siljan, Dalarna; 13) Mount Snasahögarna, Jämtland; 14) Lake Ånnsjön, Jämtland; 15) Storlien W and Storlien E, Jämtland; 16) Highway E14 between Åre and Storlien, Jämtland; 17) Mount Njulla, Lapland; 18) Torneträsk and Abisko, Lapland; 19) Björkliden, Sphagnum spp. bogs and ditches at highway E10, Lapland.

FIGURE 16. Polymerurus rhomboides. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 16. Polymerurus rhomboides. A) Habitus. B) Shape of pharynx and cephalion. C) Dorsal view of mid-trunk showing scales. Scale bars: A, 50 µm; B and C, 20 µm.

FIGURE 7 in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 7. Schematic drawing of Heterolepidoderma joermungandri n. sp. Dorsal view to the left and ventral view to the right. Scale bar: 10 µm.

FIGURE 15. Polymerurus nodicaudus. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 15. Polymerurus nodicaudus. A) Habitus. B) Shape of pharynx, mouth and hypostomium. C) Ventral view showing ventrolateral spined scales and the spined scales of the interciliary area. Scale bars: A, 100 µm; B, 40 µm; C, 15 µm.

FIGURE 3. Aspidiophorus ophiodermus. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 3. Aspidiophorus ophiodermus. A) Habitus. B) Dorsal view showing distribution of stalked scales. C) Dorsal view showing distribution and shape of scales of the furcal base. Scale bars: A, 50 µm; B, 20 µm; C, 10 µm.

FIGURE 6. Heterolepidoderma joermungandri n in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 6. Heterolepidoderma joermungandri n. sp. A) Habitus. B) Dorsal view of distribution and shape of scales. C) Habitus, arrow indicates cuticular reinforcement of pharynx and arrow heads indicate scales of the furcal base. Scale bars: A– C, 10 µm.

FIGURE 14. Lepidodermella squamata. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 14. Lepidodermella squamata. A) Habitus. B) Ventral view of head and neck region showing the transverse scales of the interciliary area. C) Dorsal view of trunk showing shape and distribution of scales. Scale bars: A, 30 µm; B, 15 µm; C, 20 µm.

FIGURE 11 in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 11. Schematic drawing of Heterolepidoderma trapezoidum n. sp. Dorsal view to the left and ventral view to the right. Scale bar: 10 µm.

FIGURE 18. Stylochaeta scirtetica. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 18. Stylochaeta scirtetica. A) Habitus. B) Ventral view showing insertion of four of the five pairs of spine groups. Scale bars: A, 40 µm; B, 15 µm.

FIGURE 12. Lepidochaetus zelinkai. A in New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden

FIGURE 12. Lepidochaetus zelinkai. A) Habitus. B) Shape of pharynx and mouth. C) Dorsal view of mid-trunk region showing distribution of spined scales. Scale bars: A, 40 µm; B, 20 µm and C, 10 µm.