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FIGURE 14 in Dactylogyrids (Platyhelminthes: Monogenea) from the gills of the African carp, Labeo coubie Rüppell (Cyprinidae), from Senegal, with descriptions of three new species of Dactylogyrus and the redescription of Dactylogyrus cyclocirrus Paperna, 1973
No full textFIGURE 14. Dogielius anthocolpos Guégan, Lambert & Euzet, 1989. A. anchor; B. ventral bar; C. hooks; D. needle; E. vagina; F. copulatory organ.Published as part of Musilová, Na Ď A, Ehulková, Eva Ř & Gelnar, Milan, 2009, Dactylogyrids (Platyhelminthes: Monogenea) from the gills of the African carp, Labeo coubie Rüppell (Cyprinidae), from Senegal, with descriptions of three new species of Dactylogyrus and the redescription of Dactylogyrus cyclocirrus Paperna, 1973, pp. 47-68 in Zootaxa 2241 on page 63, DOI: 10.5281/zenodo.19057
Parasitic flatworms infecting thorny skate, Amblyraja radiata: infection by the monogeneans Acanthocotyle verrilli and Rajonchocotyle emarginata in Svalbard
No full textParasite diversity above the Arctic circle remains understudied even for commercially valuable host taxa. Thorny skate, Amblyraja radiata, is a common bycatch species with a growing commercial value. Its natural range covers both sides of the North Atlantic including the Arctic zone. Svalbard is a Norwegian archipelago located on the northwest corner of the Barents Shelf which sustains a spectacular species diversity. So far, several monogenean species have been reported infecting thorny skate across the Atlantic Ocean. In the present study, we intend to fill in the knowledge gap on monogenean parasites infecting thorny skate in the northern part of its range and thus indirectly assess the connectivity between the thorny skate populations off the Svalbard coast and from previously studied locations. 46 monogenean individuals were recovered from 11 specimens of thorny skate. Following morphological and molecular assessment, two species of monogeneans, Acanthocotyle verrilli and Rajonchocotyle emarginata, were identified. The results serve as the northernmost record for both parasite genera and the first record of monogenean species off Svalbard. Detailed morphometric evaluation revealed a relatively high level of morphological variation in A. verrilli compared to its congeners. Phylogenetic reconstruction placed A. verrilli in a well-supported clade with A. imo. Our study also suggests high diagnostic significance of sclerotised structures in the identification of Rajonchocotyle. Even though the occurrence of two directly transmitted parasite species supports the previously suggested long-distance migration of A. radiata, future studies employing highly variable genetic markers are needed to assess the ongoing and historical migration patterns
Reduced host-specificity in a parasite infecting non-littoral Lake Tanganyika cichlids evidenced by intraspecific morphological and genetic diversity
No full textLake Tanganyika is well-known for its high species-richness and rapid radiation processes. Its assemblage of cichlid fishes recently gained momentum as a framework to study parasite ecology and evolution. It offers a rare chance to investigate the influence of a deepwater lifestyle in a freshwater fish-parasite system. Our study represents the first investigation of parasite intraspecific genetic structure related to host specificity in the lake. It focused on the monogenean flatworm Cichlidogyrus casuarinus infecting deepwater cichlids belonging to Bathybates and Hemibates. Morphological examination of C. casuarinus had previously suggested a broad host range, while the lake's other Cichlidogyrus species are usually host specific. However, ongoing speciation or cryptic diversity could not be excluded. To distinguish between these hypotheses, we analysed intraspecific diversity of C. casuarinus. Monogeneans from nearly all representatives of the host genera were examined using morphometrics, geomorphometrics and genetics. We confirmed the low host-specificity of C. casuarinus based on morphology and nuclear DNA. Yet, intraspecific variation of sclerotized structures was observed. Nevertheless, the highly variable mitochondrial DNA indicated recent population expansion, but no ongoing parasite speciation, confirming, for the first time in freshwater, reduced parasite host specificity in the deepwater realm, probably an adaptation to low host availability.sponsorship: The authors would like to thank the following people for their contribution to the field work: Andrea Vetesnikova-Simkova, Eva Rehulkova, Sarka Masova, Iva Prikrylova, Veronika Nezhybova, Radim Blazek, Gaspard Banyankimbona, Fidel Muterezi Bukinga, Constantin Amundala Shekani, Donatien Muzumani Risasi, Theophile Mulimbwa N'sibula, Joseph Mbirize Ndalozibwa, Axel Meyer, Christian Sturmbauer, Martin Reichard, the Schreyen-Brichard family and the technical staff of Fishes of Burundi. We are grateful to Ad Konings (Cichlid Press) for providing us with fish pictures. Daniel R. Brooks and Walter A. Boeger are acknowledged for useful comments on this study. We also thank Tine Huyse, Jos Snoeks, Miguel Parrent (RMCA) and people in the parasitological group, Masaryk University, Brno for their hospitality and the RMCA for providing access to the collections. Research was supported by the Czech Science Foundation (GBP505/12/G112 - ECIP). (Czech Science Foundation|GBP505/12/G112 - ECIP)status: Publishe
Parasitic flatworms infecting thorny skate, Amblyraja radiata: Infection by the monogeneans Acanthocotyle verrilli and Rajonchocotyle emarginata in Svalbard
No full textParasite diversity above the Arctic circle remains understudied even for commercially valuable host taxa. Thorny skate, Amblyraja radiata, is a common bycatch species with a growing commercial value. Its natural range covers both sides of the North Atlantic including the Arctic zone. Svalbard is a Norwegian archipelago located on the northwest corner of the Barents Shelf which sustains a spectacular species diversity. So far, several monogenean species have been reported infecting thorny skate across the Atlantic Ocean. In the present study, we intend to fill in the knowledge gap on monogenean parasites infecting thorny skate in the northern part of its range and thus indirectly assess the connectivity between the thorny skate populations off the Svalbard coast and from previously studied locations. 46 monogenean individuals were recovered from 11 specimens of thorny skate. Following morphological and molecular assessment, two species of monogeneans, Acanthocotyle verrilli and Rajonchocotyle emarginata, were identified. The results serve as the northernmost record for both parasite genera and the first record of monogenean species off Svalbard. Detailed morphometric evaluation revealed a relatively high level of morphological variation in A. verrilli compared to its congeners. Phylogenetic reconstruction placed A. verrilli in a well-supported clade with A. imo. Our study also suggests high diagnostic significance of sclerotised structures in the identification of Rajonchocotyle. Even though the occurrence of two directly transmitted parasite species supports the previously suggested long-distance migration of A. radiata, future studies employing highly variable genetic markers are needed to assess the ongoing and historical migration patterns.sponsorship: This study was supported by the Czech Science Foundation (P505/12/G112 (ECIP) and Masaryk University (MUNI/A/0918/2018). The fieldwork and SEM characterisation were supported by the Ministry of Education, Youth and Sports of the Czech Republic (projects CzechPolar2 LM 2015078 and ECOPOLARIS No. CZ.02.1.01/0.0/0.0/16_013/0001708). The research leading to results presented in this publication was partly carried out with infrastructure funded by EMBRC Belgium FWO project GOH3817N. (Czech Science Foundation (ECIP)|P505/12/G112, Masaryk University|MUNI/A/0918/2018, Ministry of Education, Youth and Sports of the Czech Republic|LM 2015078, Ministry of Education, Youth and Sports of the Czech Republic|CZ.02.1.01/0.0/0.0/16_013/0001708, EMBRC Belgium FWO project|GOH3817N)status: Publishe
Dactylogyrus anthocolpos Guegan, Lambert & Euzet 1989
No full textDogielius anthocolpos Guégan, Lambert & Euzet, 1989 (Figure 14) Type host and locality: Labeo coubie, Niger River (Bamako), Mali. Other record: Labeo coubie, Baoulé River (Missira), Mali (Guégan et al. 1989). Present record: Labeo coubie, Mare de Simenti (13 º 01.790’N; 13 º 17.608 ’W), Niokolo-Koba National Park, Senegal. Site: Gill lamellae. Type specimen: Holotype MNHN HC 271. Material examined: 3 unflattened and 6 flattened specimens in GAP. Description: Body length 296 (273–312; n = 3); greatest width 92 (80–102; n = 3) usually near midlength. Haptor 79 (73–86; n = 3) long, 160 (158–164; n = 3) wide. Single pair of anchors (ventral): inner length 38 (37–39; n = 6); outer length 47 (45–49; n = 6); point length 27 (26–29; n = 6). One bar (ventral): 66 (63–68; n = 6) long, 8 (7–8; n = 6) wide. Hooks 7 pairs, slightly dissimilar in size; hook lengths (n = 6): pairs I, II = 17 (17–18); pairs III, IV, VI, VII = 22 (21–22); pair V = 19 (19–20). Vagina sclerotized, 43 (39–47; n = 6) long. Copulatory organ composed of a curved tube and articulated accessory piece; total length 50 (45–53; n = 6); tube trace-length 48 (43–50; n = 6). Remarks: The morphology and measurements of our specimens correspond well to the original description of D. anthocolpos by Guégan et al. (1989).Published as part of Musilová, Na Ď A, Ehulková, Eva Ř & Gelnar, Milan, 2009, Dactylogyrids (Platyhelminthes: Monogenea) from the gills of the African carp, Labeo coubie Rüppell (Cyprinidae), from Senegal, with descriptions of three new species of Dactylogyrus and the redescription of Dactylogyrus cyclocirrus Paperna, 1973, pp. 47-68 in Zootaxa 2241 on page 63, DOI: 10.5281/zenodo.19057
Dactylogyrus complicitus Guegan, Lambert & Euzet 1989
No full textDogielius complicitus Guégan, Lambert & Euzet, 1989 (Figure 17) Type host and locality: Labeo coubie, Niger River (Bamako), Mali. Other record: Labeo coubie, Baoulé River (Missira), Mali (Guégan et al. 1989). Present record: Labeo coubie, Mare de Simenti (13 º 01.790’N; 13 º 17.608 ’W), Niokolo-Koba National Park, Senegal. Site: Gill lamellae. Type specimen: Holotype MNHN HC 273. Material examined: 1 flattened specimen in GAP. Description: Dimensions of the body and haptor were not taken because of the poor quality of the only found specimen. Single pair of anchors (ventral): inner length 45; outer length 48; point length 26. One bar (ventral): 68 long, 7 wide. Hooks 7 pairs, slightly dissimilar in size; hook lengths: pairs I, VI = 18; pair II = 22; pair III = 23; pairs IV, VII = 24; pair V = 20. Needles (1 pair) located near hooks of pair V. Vagina sclerotized, 398 long. Copulatory organ composed of a meandering tube and slightly sclerotized articulated accessory piece; total length 69; tube trace-length 392. Remarks: This species was easily identified based on the presence of a long, proximally coiled vagina. Also all other diagnostic features are in accordance with the original description of this species by Guégan et al. (1989).Published as part of Musilová, Na Ď A, Ehulková, Eva Ř & Gelnar, Milan, 2009, Dactylogyrids (Platyhelminthes: Monogenea) from the gills of the African carp, Labeo coubie Rüppell (Cyprinidae), from Senegal, with descriptions of three new species of Dactylogyrus and the redescription of Dactylogyrus cyclocirrus Paperna, 1973, pp. 47-68 in Zootaxa 2241 on pages 65-66, DOI: 10.5281/zenodo.19057
Dactylogyrus retroversus Guegan, Lambert & Euzet 1988
No full textDactylogyrus retroversus Guégan, Lambert & Euzet, 1988 (Figure 2) Type host and locality: Labeo coubie, Niger River (Bamako), Mali. Other record: Labeo coubie, Baoulé River (Missira), Mali (Guégan et al. 1988). Present record: Labeo coubie, Mare de Simenti (13 º 01.790’N; 13 º 17.608 ’W), Niokolo-Koba National Park, Senegal. Site: Gill lamellae. Type specimen: Holotype MNHN HC 265. Material examined: 2 flattened specimens in GAP. Description: Dimensions of the body and haptor were not taken because of the poor quality of the only 2 found specimens. Single pair of anchors (dorsal): inner length 42 (n = 2); outer length 29 (n = 2); inner root 18–19 (n = 2) long; outer root 2–3 (n = 2) long; point 17–18 (n = 2) long. One bar (dorsal): 23–24 (n = 2) long, 3 (n = 2) wide. Hooks 7 pairs, similar in shape and size; hook lengths 15–16 (n = 2). Needles (1 pair) located near hooks of pair V. Vagina nonsclerotized. Copulatory organ composed of tube and articulated accessory piece, total length 30–34 (n = 2), tube trace-length 34–35 (n = 2). Remarks: Dactylogyrus retroversus was adequately described by Guégan et al. (1988). This species closely resembles D. titus Guégan, Lambert & Euzet, 1988 as shown by similarities of the haptoral sclerites and the copulatory organ. However, D. retroversus differs from the latter species by the size of the anchor point (shorter with respect to the anchor size in D. titus) and the size of the copulatory organ (smaller in D. titus).Published as part of Musilová, Na Ď A, Ehulková, Eva Ř & Gelnar, Milan, 2009, Dactylogyrids (Platyhelminthes: Monogenea) from the gills of the African carp, Labeo coubie Rüppell (Cyprinidae), from Senegal, with descriptions of three new species of Dactylogyrus and the redescription of Dactylogyrus cyclocirrus Paperna, 1973, pp. 47-68 in Zootaxa 2241 on pages 49-50, DOI: 10.5281/zenodo.19057
Dactylogyrus clavipenis Guegan, Lambert & Euzet 1989
No full textDogielius clavipenis Guégan, Lambert & Euzet, 1989 (Figure 15) Type host and locality: Labeo coubie, Niger River (Bamako), Mali. Other record: Labeo coubie, Baoulé River (Missira), Mali (Guégan et al. 1989). Present records: Labeo coubie, Gambia River near the hotel Simenti (sand beach 13 ° 01.543’N; 13 º 17.471 ’W, gravel beach 13 º 01.395’N; 13 º 17.350 ’W), Mare de Simenti (13 º 01.790’N; 13 º 17.608 ’W), Gambia River near the Campement du Lion (13 º 01.493’N; 13 º 14.491 ’W), Niokolo-Koba National Park, Senegal. Site: Gill lamellae. Type specimens: Holotype MNHN HC 270. Material examined: 9 unflattened and 11 flattened specimens in GAP. Description: Body length 430 (360–496; n = 8); greatest width 114 (95–136; n = 9) usually near midlength. Haptor 97 (71–115; n = 7) long, 191 (178–223; n = 7) wide. Single pair of anchors (ventral): inner length 38 (35–39; n = 9); outer length 40 (38–42; n = 9); point length 29 (27–33; n = 9). One bar (ventral): 62 (57–65; n = 11) long, 10 (9–11; n = 11) wide. Hooks 7 pairs, slightly dissimilar in size; hook lengths (n = 10): pairs I, VI, VII = 20 (18–22); pair II = 23 (21–25); pairs III, IV = 22 (19–24); pair V = 21 (20–22). Needles (1 pair) located near hooks of pair V. Vagina sclerotized, 24 (19–28; n = 5) long. Copulatory organ composed of a relatively straight tube and articulated accessory piece; total length 41 (38–45; n = 10); tube trace-length 35 (34–36; n = 10). Remarks: The present material corresponds in morphometrical characteristrics to that described originally on the same host from Mali (Guégan et al. 1989).Published as part of Musilová, Na Ď A, Ehulková, Eva Ř & Gelnar, Milan, 2009, Dactylogyrids (Platyhelminthes: Monogenea) from the gills of the African carp, Labeo coubie Rüppell (Cyprinidae), from Senegal, with descriptions of three new species of Dactylogyrus and the redescription of Dactylogyrus cyclocirrus Paperna, 1973, pp. 47-68 in Zootaxa 2241 on pages 63-64, DOI: 10.5281/zenodo.19057
Dactylogyrus flagellatus Guegan, Lambert & Euzet 1989
No full textDogielius flagellatus Guégan, Lambert & Euzet, 1989 (Figure 18) Type host and locality: Labeo coubie, Niger River (Bamako), Mali. Other record: Labeo coubie, Baoulé River (Missira), Mali (Guégan et al. 1989). Present record: Labeo coubie, Gambia River near the Campement du Lion (13 º 01.493’N; 13 º 14.491 ’W), Niokolo-Koba National Park, Senegal. Site: Gill lamellae. Type specimen: Holotype MNHN HC 272. Material examined: 2 unflattened and 4 flattened specimens in GAP. Description: Body length 326 (270–410; n = 2); greatest width 78 (69–86; n = 2) usually near midlength. Haptor 62 (53–71; n = 2) long, 129 (111–148; n = 2) wide. Single pair of anchors (ventral): inner length 40 (40–41; n = 3); outer length 42 (40–43; n = 3); point 32 (31–33; n = 3) long. One bar (ventral): 65 (64–67; n = 3) long, 7 (6–8; n = 3) wide. Hooks 7 pairs, slightly dissimilar in size; hook lengths (n = 2): pairs I, III, IV, V = 19–21; pair II = 18–19; pairs VI, VII = 22–23. Needles (1 pair) located near hooks of pair V. Vagina sclerotized, 139 (116–157; n = 4) long. Copulatory organ composed of a long slender tube and articulated accessory piece; total length 48 (47–49; n = 4); tube trace-length 156 (151–164; n = 4). Remarks: The present specimens of D. flagellatus correspond in most morphological and metrical characters to those described originally (see Guégan et al. 1989). Only minor differences could be detected in the outer lengths of anchors, which were slightly longer in our specimens found on L. coubie from Senegal (40–43 vs. 34–38). However, we do not consider these differences to be significant because of the poorly defined nodal point for measuring the outer and inner anchor lengths on the outer surface of the concave part of the shaft (see Fig. 1).Published as part of Musilová, Na Ď A, Ehulková, Eva Ř & Gelnar, Milan, 2009, Dactylogyrids (Platyhelminthes: Monogenea) from the gills of the African carp, Labeo coubie Rüppell (Cyprinidae), from Senegal, with descriptions of three new species of Dactylogyrus and the redescription of Dactylogyrus cyclocirrus Paperna, 1973, pp. 47-68 in Zootaxa 2241 on page 66, DOI: 10.5281/zenodo.19057
Dactylogyrus harpagatus Guegan, Lambert & Euzet 1989
No full textDogielius harpagatus Guégan, Lambert & Euzet, 1989 (Figure 16) Type host and locality: Labeo coubie, Niger River (Bamako), Mali. Other record: Labeo coubie, Baoulé River (Missira), Mali (Guégan et al. 1989). Present records: Labeo coubie, Gambia River near the hotel Simenti (sand beach 13 ° 01.543’N; 13 º 17.471 ’W, gravel beach 13 º 01.395’N; 13 º 17.350 ’W), Mare de Simenti (13 º 01.790’N; 13 º 17.608 ’W), Gambia River near the Campement du Lion (13 º 01.493’N; 13 º 14.491 ’W), Niokolo-Koba National Park, Senegal. Site: Gill lamellae. Type specimen: Holotype MNHN HC 269. Material examined: 4 unflattened and 10 flattened specimens in GAP. Description: Body length 295 (215–339; n = 4); greatest width 84 (66–121; n = 4) usually near midlength. Haptor 72 (52–99, n = 4) long, 143 (112–155; n = 4) wide. Single pair of anchors (ventral): inner length 32 (31–33; n = 10); outer length 39 (38–41; n = 10); point length 22 (18–25; n = 10). One bar (ventral): 52 (50–55; n = 10) long, 10 (9–10; n = 10) wide. Hooks 7 pairs, slightly dissimilar in size; hook lengths (n = 5): pairs I, II, III, IV, V = 21 (19–22); pair VI = 22 (21–23); pair VII = 23 (23–24). Needles (1 pair) located near hooks of pair V. Vagina sclerotized, 17 (15–18; n = 10) long. Copulatory organ composed of a relatively straight tube and articulated accessory piece; total length 34 (33–35; n = 10); tube trace-length 29 (27–30; n = 10). Remarks: The sclerotized structures reported in the original description of Dogielius harpagatus and those found on the present specimens correspond both in morphology and size. This species closely resembles Dogielius clavipenis in the morphology of the haptoral structures and the copulatory organ. However, it differs from it by having a simple copulatory base, i.e. without flap. Guégan et al. (1989) erroneously depicted this structure as proximal part of the accessory piece.Published as part of Musilová, Na Ď A, Ehulková, Eva Ř & Gelnar, Milan, 2009, Dactylogyrids (Platyhelminthes: Monogenea) from the gills of the African carp, Labeo coubie Rüppell (Cyprinidae), from Senegal, with descriptions of three new species of Dactylogyrus and the redescription of Dactylogyrus cyclocirrus Paperna, 1973, pp. 47-68 in Zootaxa 2241 on pages 64-65, DOI: 10.5281/zenodo.19057
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