Monogeneans from Catfishes in Lake Tanganyika. I: Two new species of Bagrobdella (Dactylogyridae) from Auchenoglanis occidentalis (Siluriformes: Claroteidae)

In the framework of the study of Siluriform fish monogeneans of Lake Tanganyika, we described two new species of Bagrobdella Paperna, 1969 from Auchenoglanis occidentalis (Valenciennes, 1840). Bagrobdella vanhovei sp. nov. is characterized by the morphology of its MCO which is unique among its congeners, presenting a non-terminal opening, whereas the other species have a terminal opening, and Bagrobdella vansteenbergei sp. nov. characterized by the size of its hooks, which are almost all of the same size, and its male copulating organ with a unique shape: a sub-terminal opening and no membrane surrounding. The Multivariate analysis done on morphometrical characters shows that the new and already described species are well individualized, except for Bagrobdella parauchenoglanii Akoumba, Pariselle, Tombi & Bilong Bilong, 2017 and Bagrobdella fraudulenta Euzet & Le Brun, 1990 (but these two species are easily distinguishable by their morphology), and that B. vanhovei sp. nov. has a great intra-specific morphometrical variation.

KEY WORDS:
Bagrobdella vanhovei sp. nov.; Bagrobdella vansteenbergei sp. nov.; Congo Basin; East Africa; intraspecific variation; over dispersion.

Authorship

Archimède Mushagalusa Mulega

Laboratory of Biodiversity, Ecology and Genome, Faculty of Sciences, Mohammed V University. 10000 Rabat, Morocco.Mohammed V UniversityMoroccoRabat, MoroccoLaboratory of Biodiversity, Ecology and Genome, Faculty of Sciences, Mohammed V University. 10000 Rabat, Morocco.

Département de Biologie, Centre de Recherche en Hydrobiologie. B.P. 73, Uvira, Democratic Republic of the Congo.Centre de Recherche en HydrobiologieDemocratic Republic of the CongoUvira, Democratic Republic of the CongoDépartement de Biologie, Centre de Recherche en Hydrobiologie. B.P. 73, Uvira, Democratic Republic of the Congo.

Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity & Toxicology. Diepenbeek, Belgium.Hasselt UniversityBelgiumDiepenbeek, BelgiumHasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity & Toxicology. Diepenbeek, Belgium.

http://orcid.org/0000-0003-3242-154X

Fidel Muterezi Bukinga

http://orcid.org/0000-0002-5459-5121

John Francis Akoumba

Laboratory of Parasitology and Ecology, Faculty of Science, University of Yaoundé I. P.O. Box 812, Yaoundé, Cameroon.University of Yaoundé ICameroonYaoundé, CameroonLaboratory of Parasitology and Ecology, Faculty of Science, University of Yaoundé I. P.O. Box 812, Yaoundé, Cameroon.

http://orcid.org/0000-0001-6295-6129

Pascal Masilya Mulungula

Unité d’Enseignement et de Recherche en Hydrobiologie Appliquée, Institut Supérieur Pédagogique de Bukavu. Bukavu, Democratic Republic of the Congo.Institut Supérieur Pédagogique de BukavuDemocratic Republic of the CongoBukavu, Democratic Republic of the CongoUnité d’Enseignement et de Recherche en Hydrobiologie Appliquée, Institut Supérieur Pédagogique de Bukavu. Bukavu, Democratic Republic of the Congo.

http://orcid.org/0000-0002-6205-2004

Antoine Pariselle

ISEM, CNRS, Université de Montpellier, IRD. 34095 Montpellier, France.Université de MontpellierFranceMontpellier, FranceISEM, CNRS, Université de Montpellier, IRD. 34095 Montpellier, France.

http://orcid.org/0000-0002-1591-7423

Corresponding author: Antoine Pariselle (antoine.pariselle@ird.fr)

Editorial responsibility

Walter A.P. Boeger

Author Contributions

AMM and AP designed and supervised this study. FMB and PMM contributed to sampling, the collection and identification of fish, and provided scientific background information on the fish. JFA provide raw data on Bagrobdella parauchenoglanii. AMM and AP analysed the data and wrote the paper.

Competing Interests

The authors have declared that no competing interests exist.

SCIMAGO INSTITUTIONS RANKINGS

ISEM, CNRS, Université de Montpellier, IRD. 34095 Montpellier, France.Université de MontpellierFranceMontpellier, FranceISEM, CNRS, Université de Montpellier, IRD. 34095 Montpellier, France.

Figures

Figures (8)

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Figure 1
Sampling sites localities.

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Figures 2-7
Measurement scheme of the sclerotized structures of Bagrobdella spp.: (2) anchor, a: total length; b: blade length; c: shaft length; d: guard length; e: point length. (3) Dorsal bar, x: horizontal length; y: vertical length; w: width. (4) Ventral bar, x: horizontal length; cx: length of median projection; cy: width of median projection; BL: length of outgrowth; Bl: width of outgrowth. (5) Trapezoidal piece, L: length; l: width. (6) Male copulatory complex, Pe: length of penis, AL: length of bulb; Al: width of bulb. (7) Length of hook.

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Figure 8
Bagrobdella vanhovei sp. nov. haptoral structure and MCO. Scale bar: 20 µm.

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Figures 9-14
Haptors of the six species belonging to Bagrobdella: (9) Bagrobdella vanhovei sp. nov.; (10) Bagrobdella vansteenbergei sp. nov.; (11) Bagrobdella auchenoglanii; (12) Bagrobdella fraudulenta; (13) Bagrobdella anthopenis; (14) Bagrobdella parauchenoglanii (Akoumba et al 2017Akoumba JF, Pariselle A, Tombi J, Bilong Bilong CF (2017) Description of two new ancyrocephalid (Quadriacanthus and Bagrobdella) monogenea from the gills of auchenoglanid catfishes (Pisces, Siluriformes, Claroteidae) in Cameroon. Vie et Milieu, Life and Environment 67(2): 59-64., Euzet and Le Brun 1990Euzet L, Le Brun N (1990) Monogènes du genre Bagrobdella Paperna, 1969 parasites branchiaux d’Auchenoglanis occidentalis Cuvier et Valenciennes, 1840) (Teleostei, Siluriformes, Bagridae). Journal of African Zoology 104: 37-48.). Scale bars: 20 µm.

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Figures 15-20
MCO of the six species belonging to Bagrobdella: (15) Bagrobdella vanhovei sp. nov.; (16) Bagrobdella vansteenbergei sp. nov.; (17) Bagrobdella auchenoglanii; (18) Bagrobdella fraudulenta; (19) Bagrobdella anthopenis; (20) Bagrobdella parauchenoglanii (Akoumba et al. 2017Akoumba JF, Pariselle A, Tombi J, Bilong Bilong CF (2017) Description of two new ancyrocephalid (Quadriacanthus and Bagrobdella) monogenea from the gills of auchenoglanid catfishes (Pisces, Siluriformes, Claroteidae) in Cameroon. Vie et Milieu, Life and Environment 67(2): 59-64., Euzet and Le Brun 1990Euzet L, Le Brun N (1990) Monogènes du genre Bagrobdella Paperna, 1969 parasites branchiaux d’Auchenoglanis occidentalis Cuvier et Valenciennes, 1840) (Teleostei, Siluriformes, Bagridae). Journal of African Zoology 104: 37-48.). Scale bar: 20 µm.

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Figures 21-26
(21) Bagrobdella vanhovei sp. nov. microphotograph in toto; (22) Bagrobdella vansteenbergei sp. nov. microphotograph in toto; (23) Microphotograph of the trapezoidal plate in the haptor of Bagrobdella vanhovei; (24) Button like structure; (25) Semi-circular structure; (26) Egg (B. vanhovei sp. nov). Scale bars: 21 = 100 µm, 22 = 200 µm, 23, 24, 26 = 20 µm, 25 = 50 µm.

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Figure 27
Bagrobdella vansteenbergei sp. nov., haptoral structure and MCO. Scale bar: 20 µm.

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Figure 28
PCA-Biplot of species belonging to Bagrobdella.

Figure 1 Sampling sites localities.

Figures 2-7 Measurement scheme of the sclerotized structures of Bagrobdella spp.: (2) anchor, a: total length; b: blade length; c: shaft length; d: guard length; e: point length. (3) Dorsal bar, x: horizontal length; y: vertical length; w: width. (4) Ventral bar, x: horizontal length; cx: length of median projection; cy: width of median projection; BL: length of outgrowth; Bl: width of outgrowth. (5) Trapezoidal piece, L: length; l: width. (6) Male copulatory complex, Pe: length of penis, AL: length of bulb; Al: width of bulb. (7) Length of hook.

Figure 8 Bagrobdella vanhovei sp. nov. haptoral structure and MCO. Scale bar: 20 µm.

Figures 9-14 Haptors of the six species belonging to Bagrobdella: (9) Bagrobdella vanhovei sp. nov.; (10) Bagrobdella vansteenbergei sp. nov.; (11) Bagrobdella auchenoglanii; (12) Bagrobdella fraudulenta; (13) Bagrobdella anthopenis; (14) Bagrobdella parauchenoglanii (Akoumba et al 2017Akoumba JF, Pariselle A, Tombi J, Bilong Bilong CF (2017) Description of two new ancyrocephalid (Quadriacanthus and Bagrobdella) monogenea from the gills of auchenoglanid catfishes (Pisces, Siluriformes, Claroteidae) in Cameroon. Vie et Milieu, Life and Environment 67(2): 59-64., Euzet and Le Brun 1990Euzet L, Le Brun N (1990) Monogènes du genre Bagrobdella Paperna, 1969 parasites branchiaux d’Auchenoglanis occidentalis Cuvier et Valenciennes, 1840) (Teleostei, Siluriformes, Bagridae). Journal of African Zoology 104: 37-48.). Scale bars: 20 µm.

Figures 15-20 MCO of the six species belonging to Bagrobdella: (15) Bagrobdella vanhovei sp. nov.; (16) Bagrobdella vansteenbergei sp. nov.; (17) Bagrobdella auchenoglanii; (18) Bagrobdella fraudulenta; (19) Bagrobdella anthopenis; (20) Bagrobdella parauchenoglanii (Akoumba et al. 2017Akoumba JF, Pariselle A, Tombi J, Bilong Bilong CF (2017) Description of two new ancyrocephalid (Quadriacanthus and Bagrobdella) monogenea from the gills of auchenoglanid catfishes (Pisces, Siluriformes, Claroteidae) in Cameroon. Vie et Milieu, Life and Environment 67(2): 59-64., Euzet and Le Brun 1990Euzet L, Le Brun N (1990) Monogènes du genre Bagrobdella Paperna, 1969 parasites branchiaux d’Auchenoglanis occidentalis Cuvier et Valenciennes, 1840) (Teleostei, Siluriformes, Bagridae). Journal of African Zoology 104: 37-48.). Scale bar: 20 µm.

Figures 21-26 (21) Bagrobdella vanhovei sp. nov. microphotograph in toto; (22) Bagrobdella vansteenbergei sp. nov. microphotograph in toto; (23) Microphotograph of the trapezoidal plate in the haptor of Bagrobdella vanhovei; (24) Button like structure; (25) Semi-circular structure; (26) Egg (B. vanhovei sp. nov). Scale bars: 21 = 100 µm, 22 = 200 µm, 23, 24, 26 = 20 µm, 25 = 50 µm.

Figure 27 Bagrobdella vansteenbergei sp. nov., haptoral structure and MCO. Scale bar: 20 µm.

Figure 28 PCA-Biplot of species belonging to Bagrobdella.

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Monogeneans from Catfishes in Lake Tanganyika. I: Two new species of Bagrobdella (Dactylogyridae) from Auchenoglanis occidentalis (Siluriformes: Claroteidae)

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[1] Corresponding author: Antoine Pariselle (antoine.pariselle@ird.fr)