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FIGURES 24–29. Temnocephala caddisflyi n in Trichoptera — the newest insect order host of temnocephalans (Platyhelminthes, Temnocephalida) and the description of a new species of Temnocephala from Brazil

FIGURES 24–29. Temnocephala caddisflyi n. sp., prostatic bulb and introvert observed in different focusing planes with DIC. 24. Prostatic bulb showing the orifice entering prostatic secretion (arrow), prostatic secretion (ps), prostatic cells (pc), and the prostatic vesicle (pv). Scale bar = 50 µm. 25. Prostatic bulb (pb) and seminal vesicle (sv) with the ejaculatory duct (ej) entering the prostatic bulb. Scale bar = 50 µm. 26–29. Distal portion of the introvert, showing the large spines and the shorter swelling portion seen in different focusing planes. Scale bars = 10 µm.

FIGURES 16–17. Temnocephala caddisflyi n in Trichoptera — the newest insect order host of temnocephalans (Platyhelminthes, Temnocephalida) and the description of a new species of Temnocephala from Brazil

FIGURES 16–17. Temnocephala caddisflyi n. sp. (SEM). 16. Total body showing the posterior margin of the 'saddle-shaped', dorsolateral, 'excretory' syncytial plates (white arrows) and nephridiopores (white head arrows) (n). Scale bar = 200 µm. 17. Left, dorsolateral, 'excretory' syncytial plate (black head arrows) and the nephridiopore (white head arrow) (n). Scale bar = 20 µm.

FIGURES 9–10. Temnocephala caddisflyi n in Trichoptera — the newest insect order host of temnocephalans (Platyhelminthes, Temnocephalida) and the description of a new species of Temnocephala from Brazil

FIGURES 9–10. Temnocephala caddisflyi n. sp. juvenile cleared in lactophenol. 9. Juvenile showing rhabditogenic glands (black head arrows); disc glands (black arrows); limit between rhabditogenic glands and disc glands (white arrows); two large disc glands (paranephrocytes?) (white head arrows). Scale bar = 100 µm. 10. Testicular region showing the introvert already formed (white head arrow). Scale bar = 100 µm.

FIGURES 1–2 in Trichoptera — the newest insect order host of temnocephalans (Platyhelminthes, Temnocephalida) and the description of a new species of Temnocephala from Brazil

FIGURES 1–2. Diagram of the 'complex' cirrus and linear diagram of the 'complex' vagina. 1a. Entire cirrus (black head arrow indicates the limit between the shaft (s) and the introvert (i)); introvert angle (ia); shaft angle (sa). 1b. Higher magnification of the introvert: forward projecting retractor muscle (fprm); introvert inflation (ii); introvert-shaft limit (il); large spines (ls); retractor muscle (rm). 2. Female reproductive organs: ovary (ov); vitelline duct (vd); vesicula resorbens (vr); vesicula intermedia (vi); vagina proximal portion (pva); vagina middle portion (mva); vagina distal portion (dva); vaginal sphincter (vs).

FIGURES 3–5. Caddisfly larvae genus Baripenthus. 3 in Trichoptera — the newest insect order host of temnocephalans (Platyhelminthes, Temnocephalida) and the description of a new species of Temnocephala from Brazil

FIGURES 3–5. Caddisfly larvae genus Baripenthus. 3. Larva inside the case. Scale bar = 5 mm. 4. Anterior portion of a larva removed from the case, showing the dorsal area of egg deposition. Scale bar = 1 mm. 5. Another specimen removed from the case, dorsal view, showing in higher magnification, a larger number of eggs. Scale bar = 500 µm.

FIGURES 18–20 in Trichoptera — the newest insect order host of temnocephalans (Platyhelminthes, Temnocephalida) and the description of a new species of Temnocephala from Brazil

FIGURES 18–20. Cirrus of Temnocephala caddisflyi n. sp. from trichopterans, seen with Nomarski´s differential interference contrast microscopy (DIC). 18. Photomicrograph of the entire 'complex' cirrus, Scale bar = 100 µm. 19. Limit of the introvert portion with the shaft (black arrow), forward projecting dorsal retractor muscle (fprm), and ventral retractor muscle (rm). Scale bar = 50 µm. 20. Introvert´s swelling portion (ii) and the long spines which run along the inner wall, showing the rows of spines. Scale bar = 10 µm. FIGURES 21–23. Cirrus of Temnocephala curvicirri from belostomatid hemipterans, seen with DIC. 21. Entire 'complex' cirrus. Scale bar = 200 µm. 22. Limit of the introvert portion with the shaft (arrow), forward projecting dorsal retractor muscle (fprm), and ventral retractor muscle (rm). Scale bar = 50 µm. 23. Distal introvert´s swelling portion (ii), showing the rows of spines. Scale bar = 10 µm.

FIGURES 11–15. Temnocephala caddisflyi n in Trichoptera — the newest insect order host of temnocephalans (Platyhelminthes, Temnocephalida) and the description of a new species of Temnocephala from Brazil

FIGURES 11–15. Temnocephala caddisflyi n. sp. 11. Incomplete diagram of juvenile specimen, dorsal view, showing rhabditogenic glands (rg), extending along the sides of intestinal sac, still uncovered by vitellaria, and ducts entering tentacles. Scale bar = 100 µm. 12. Incomplete diagram of the posterior region of a juvenile specimen, dorsal view, showing adhesive disc glands (dg), including the pair of larger glands (paranephrocytes?) between testes (ldg (p)). Scale bar = 100µm. 13. Incomplete diagram of an adult specimen showing adhesive disk (ad), anterior testes (at), excretory vesicle (ev), Haswell glands (hg), mouth (m), pharynx (ph), posterior testis (pt), vitelline glands (vg), and tentacles (t). Scale bar = 250 µm. 14. Female reproductive complex, showing anterior portion of the vaginal sphincter (avs), genital atrium (ga), posterior portion of the vaginal sphincter (pvs), vesicula resorbens (vr), ovary (ov), vagina proximal portion (pva), vagina middle portion (mva), vagina distal portion (dva), vesicula intermedia (vi), and vitelline duct (vd). Scale bar = 50 µm. 15. 'Complex' cirrus, showing shaft, introvert, and the path of movement that the dorsal retractor muscle is capable of doing (arrow), during the introduction in the vagina. Scale bar = 100 µm.

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Figure 2 in Distributions of two ectosymbionts, branchiobdellidans (Annelida: Clitellata) and scutariellids (Platyhelminthes: "Turbellaria": Temnocephalida), on atyid shrimp (Arthropoda: Crustacea) in southeast China

Figure 2. Distribution of Neocaridina spp. collection sites (numbered) in southeast China with pie charts depicting prevalence of branchiobdellidans (horizontal lines), scutariellids (dotted), both (solid), and absent (open); data from Table 1.

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Figure 1 in Distributions of two ectosymbionts, branchiobdellidans (Annelida: Clitellata) and scutariellids (Platyhelminthes: "Turbellaria": Temnocephalida), on atyid shrimp (Arthropoda: Crustacea) in southeast China

Figure 1. Photomicrographs of slide mounted ectosymbionts from Neocaridina spp. shrimp in southeast China: (A) Holtodrilus truncatus (Branchiobdellida); (B) Scutariella japonica (Temnocephalida).

FIGURE 6 in New species of Temnocephala (Platyhelminthes, Temnocephalidae) ectosymbiont on decapod crustaceans Aegla jarai (Aeglidae) from Brazil and Samastacus spinifrons (Parastacidae) from Chile

FIGURE 6. Photomicrographs of cirri of Temnocephala catarinensis sp. nov. from Samastacus spinifrons, seen with Nomarski's DIC microscopy. A. Entire cirrus (lateral view), showing the evident curvature. B. Entire cirrus (dorsal or ventral view), showing that the curvature is less evident when the cirrus is in this position and the proximal limit of the introvert (head arrow). Scale bars: 25 μm. C–H. Introvert seen in different focusing planes, showing the proximal limit of the introvert (arrow), scale bars: 10 μm.

FIGURE 3 in New species of Temnocephala (Platyhelminthes, Temnocephalidae) ectosymbiont on decapod crustaceans Aegla jarai (Aeglidae) from Brazil and Samastacus spinifrons (Parastacidae) from Chile

FIGURE 3. Line drawings of holotype of Temnocephala catarinensis sp. nov. from Aegla jarai. A. Adult specimen, ventral view, scale bar: 250 μm. B. Cirrus showing the proximal limit of the introvert (arrow), scale bar: 20μm. C. Partial line drawings of the male reproductive system. D. Partial line drawings of the female reproductive system. Scale bars: 50 μm. (adhesive disc (ad), anterior testes (at), anterior portion of the vaginal sphincter (avs), cirrus (c), deferent vessels (dd), excretory vesicle (ev), genital atrium (ga), genital pore (gp), Haswell glands (hg), intestine (i), mouth (m), ovary (ov), paranephrocytes (pa), prostatic bulb (pb), prostatic cells (pc), pharynx (ph), prostatic secretions (ps), posterior testis (pt), posterior portion of the vaginal sphincter (pvs), seminal vesicle (sv), tentacles (t), vagina (va), vitelline duct (vd), vitelline glands (vg), vesicula intermedia (vi), vesicula resorbens (vr)).

FIGURE 1. Aegla jarai A in New species of Temnocephala (Platyhelminthes, Temnocephalidae) ectosymbiont on decapod crustaceans Aegla jarai (Aeglidae) from Brazil and Samastacus spinifrons (Parastacidae) from Chile

FIGURE 1. Aegla jarai A. Merus part of the cheliped showing unhatched (black head arrow) and hatched eggs (white head arrows) of Temnocephala catarinensis sp. nov. Scale bar: 1 mm. B. Posterior portion of the left side of the body showing posterior limit of the rhabditogenic glands (black head arrows) and the posterior limit of the disc glands (white head arrows) of Temnocephala catarinensis sp. nov., Scale bar: 250 μm. C. Ventral view of adult specimens of Temnocephala catarinensis sp. nov. from Aegla jarai. Scale bar: 250 μm.

FIGURE 2 in New species of Temnocephala (Platyhelminthes, Temnocephalidae) ectosymbiont on decapod crustaceans Aegla jarai (Aeglidae) from Brazil and Samastacus spinifrons (Parastacidae) from Chile

FIGURE 2. Dorsal view of Temnocephala catarinensis sp. nov. observed with SEM, showing details of the epidermal 'excretory' syncytial plates (EPs). A. Specimen from Aegla jarai showing right EP and nephridiopore (n). B. Specimen from Samastacus spinifrons showing EPs and nephridiopores (n). C. Detail of the right EP from Samastacus spinifrons showing its limits and nephridiopore (n). Scale bars: 100 μm.

FIGURE 4 in New species of Temnocephala (Platyhelminthes, Temnocephalidae) ectosymbiont on decapod crustaceans Aegla jarai (Aeglidae) from Brazil and Samastacus spinifrons (Parastacidae) from Chile

FIGURE 4. Partial reproductive system of an adult specimen of Temnocephala catarinensis sp. nov. from Aegla jarai. A. Partial female and male reproductive system B. Partial female reproductive system C. Partial male reproductive system. Scale bars: 50 μm. (anterior portion of the vaginal sphincter (avs), cirrus (c), genital atrium (ga), genital pore (gp), ovary (ov), prostatic bulb (pb), posterior portion of the vaginal sphincter (pvs), seminal vesicle (sv), vagina (va), vesicula intermedia (vi), vesicula resorbens (vr)).

Figure 4 from: Lenis C, Ruiz F, Muskus C, Marcilla A, Vélez I (2020) A new flatworm species of Temnocephala (Rhabdocoela, Temnocephalidae) ectosymbiont on the freshwater crab Valdivia serrata (Decapoda, Trichodactylidae) from Amazonas, Colombia. ZooKeys 918: 1-14. https://doi.org/10.3897/zookeys.918.38201

Figure 4 Details of the reproductive system of Temnocephala ivandarioi sp. nov. A, B partial female reproductive system, showing: anterior portion of the distal vaginal sphincter (advs), anterior portion of the proximal vaginal sphincter (apvs), distal vaginal sphincter (dvs), genital atrium (ga), posterior portion of the distal vaginal sphincter (pdvs), posterior portion of the proximal vaginal sphincter (ppvs), proximal vaginal sphincter (pvs), ovary (ov), vagina (va), and vesicula resorbens (vr) C, D partial male reproductive system, showing: cirrus (c), prostatic bulb (pb), seminal vesicle duct (svd), seminal vesicle (sv), and vasa deferentia (vd) E, F cirrus introvert observed in different focusing planes, view of the circle of sclerites (sp) in the distal portion of the introvert and the smooth portion (smp) in the proximal limit of the introvert (pli). Scale bars: 50 μm (A–D); 20 μm (E, F).

Figure 3 from: Lenis C, Ruiz F, Muskus C, Marcilla A, Vélez I (2020) A new flatworm species of Temnocephala (Rhabdocoela, Temnocephalidae) ectosymbiont on the freshwater crab Valdivia serrata (Decapoda, Trichodactylidae) from Amazonas, Colombia. ZooKeys 918: 1-14. https://doi.org/10.3897/zookeys.918.38201

Figure 3 Temnocephala ivandarioi sp. nov. details of epidermal excretory syncytial plates (DLSPs) and eggs A antero-lateral area observed with SEM showing leftmost tentacle and left DLSP, arrow showing contour and position of excretory pores (n) B line drawing of entire specimen showing the DLSPsC egg observed with SEM showing the filament (fi), peduncle (pe), and plane of fracture of the operculum (pf) D line drawing of a whole egg showing the oblique fracture plane to the longitudinal axis of the egg E live adult specimen showing red eyespot pigment F unhatched egg showing the filament (fi) G, H live eggs deposited on branchial chambers of V. serrata. Scale bars: 100 μm (A–F); 1mm (G, H).

Figure 6 from: Lenis C, Ruiz F, Muskus C, Marcilla A, Vélez I (2020) A new flatworm species of Temnocephala (Rhabdocoela, Temnocephalidae) ectosymbiont on the freshwater crab Valdivia serrata (Decapoda, Trichodactylidae) from Amazonas, Colombia. ZooKeys 918: 1-14. https://doi.org/10.3897/zookeys.918.38201

Figure 6 Diagrams of the cirrus of the species of Temnocephala associated with trichodactylid crabs. Terminology based on the cirrus structure (see comparative notes and Fig. 5). ATemnocephala ivandarioi sp. nov. (present study) BTemnocephala lanei Pereira & Cuocolo, 1941 CTemnocephala longivaginata Seixas, Amato & Amato, 2011 DTemnocephala lutzi Monticelli, 1913 (Amato et al. 2005) ETemnocephala microdactyla Monticelli, 1903 FTemnocephala pignalberiae Dioni, 1967 (Amato et al. 2010) GTemnocephala santafesina Dioni, 1967 HTemnocephala trapeziformis Amato, Amato & Seixas, 2006 ITemnocephala travassosfilhoi Pereira & Cuocolo, 1941. Key: Shaft [shape: CO–cone; FU–funnel]; [curvature: CU–curved up; ST–straight; CD–curved down]. Introvert [shape: CY–cylindrical; CO–cone; SC–scoop]; [armed with: UN–unarmed; SP–spines; SL–sclerites; RI–ridges; ND–not described]; [angle: NO–not oblique; VO–very oblique]; [curvature: NC–not curved; FC–forward curved; BC–backward curved].

Figure 5 from: Lenis C, Ruiz F, Muskus C, Marcilla A, Vélez I (2020) A new flatworm species of Temnocephala (Rhabdocoela, Temnocephalidae) ectosymbiont on the freshwater crab Valdivia serrata (Decapoda, Trichodactylidae) from Amazonas, Colombia. ZooKeys 918: 1-14. https://doi.org/10.3897/zookeys.918.38201

Figure 5 Diagrams showing the terminology used to describe the cirrus of the species of Temnocephala (terminology updated from Sewell et al. (2007), Seixas et al. (2011), Garcés et al. (2013), and Ponce de León et al. (2015); diagrams modified from Sewell et al. 2007: 205, fig. 2).

Figure 1 from: Lenis C, Ruiz F, Muskus C, Marcilla A, Vélez I (2020) A new flatworm species of Temnocephala (Rhabdocoela, Temnocephalidae) ectosymbiont on the freshwater crab Valdivia serrata (Decapoda, Trichodactylidae) from Amazonas, Colombia. ZooKeys 918: 1-14. https://doi.org/10.3897/zookeys.918.38201

Figure 1 Temnocephala ivandarioi sp. nov. and Valdivia serrataA paratype of Temnocephala ivandarioi sp. nov. showing an egg, ventral view B adult paratype stained in Meyer´s paracarmine C holotype stained in Borax carmine D male specimen of V. serrataE abdomen F gonopods, lateral view. Scale bars: 200 µm (A–C); 10 mm (D–F).

Figure 2 from: Lenis C, Ruiz F, Muskus C, Marcilla A, Vélez I (2020) A new flatworm species of Temnocephala (Rhabdocoela, Temnocephalidae) ectosymbiont on the freshwater crab Valdivia serrata (Decapoda, Trichodactylidae) from Amazonas, Colombia. ZooKeys 918: 1-14. https://doi.org/10.3897/zookeys.918.38201

Figure 2 Temnocephala ivandarioi sp. nov. A adult specimen diagram, showing adhesive disk (ad), anterior testes (at), cyanophilous glands (cg), disk glands (dg), excretory vesicle (ev), Haswell´s glands (hg), intestinal sac (i), mouth (m), pharynx (ph), posterior testes (pt), rhabditogenic glands (rg), tentacles (t), and vitellarium (v) B reproductive system, showing female reproductive complex: anterior portion of the distal vaginal sphincter (advs), anterior portion of the proximal vaginal sphincter (apvs), genital atrium (ga), genital pore (gp), posterior portion of the distal vaginal sphincter (pdvs), posterior portion of the proximal vaginal sphincter (ppvs), ovary (ov), vagina (va), and resorbens vesicle (vr); and male reproductive organs: cirrus (c), prostatic bulb (pb), prostatic vesicle (pv), seminal vesicle (sv), and vasa deferentia (vd) C line drawing of cirrus in different focusing planes, showing the sclerites portion of the introvert (sp), and proximal limit of the introvert (arrows). Scale bars: 200 µm (A); 100 µm (B); 20 μm (C).