Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin Author Jorissen, Michiel W. P. Research Group Zoology: Biodiversity, & Toxicology, Centre for Environmental Sciences, Hasselt University, & Royal Museum for Central Africa, Leuvensesteenweg 13, 3080 Tervuren, Belgium Author Pariselle, Antoine ISEM, Univ de Montpellier, CNRS, IRD, Montpellier, France Author Huyse, Tine Royal Museum for Central Africa, Leuvensesteenweg 13, 3080 Tervuren, Belgium & Laboratory of Biodiversity and Evolutionary Genomics, University of Leuven, Charles Deberiotstraat 42, 3000 Leuven, Belgium Author Vreven, Emmanuel J. Royal Museum for Central Africa, Leuvensesteenweg 13, 3080 Tervuren, Belgium & Laboratory of Biodiversity and Evolutionary Genomics, University of Leuven, Charles Deberiotstraat 42, 3000 Leuven, Belgium Author Snoeks, Jos Royal Museum for Central Africa, Leuvensesteenweg 13, 3080 Tervuren, Belgium & Laboratory of Biodiversity and Evolutionary Genomics, University of Leuven, Charles Deberiotstraat 42, 3000 Leuven, Belgium Author Decru, Eva Royal Museum for Central Africa, Leuvensesteenweg 13, 3080 Tervuren, Belgium & Laboratory of Biodiversity and Evolutionary Genomics, University of Leuven, Charles Deberiotstraat 42, 3000 Leuven, Belgium Author Kusters, Thomas Research Group Zoology: Biodiversity, & Toxicology, Centre for Environmental Sciences, Hasselt University, Author Lunkayilakio, Soleil Wamuini Institut Supérieur Pédagogique, Mbanza-Ngungu, B. P. 127, Democratic Republic of the Congo Author Bukinga, Fidel Muterezi Centre de Recherche en Hydrobiologie, Uvira, B. P. 73, Democratic Republic of the Congo Author Artois, Tom Research Group Zoology: Biodiversity, & Toxicology, Centre for Environmental Sciences, Hasselt University, Author Vanhove, Maarten P. M. Research Group Zoology: Biodiversity, & Toxicology, Centre for Environmental Sciences, Hasselt University, & Laboratory of Biodiversity and Evolutionary Genomics, University of Leuven, Charles Deberiotstraat 42, 3000 Leuven, Belgium & Department of Botany and Zoology, Faculty of Science, Masaryk University, Kamenice 735 / 5, 625 00 Brno, Czech Republic & Zoology Unit, Finnish Museum of Natural History, University of Helsinki, Pohjoinen Rautatiekatu 13, 00100 Helsinki, Finland text Parasite 2018 Paris, France 2018-12-07 25 64 1 21 http://dx.doi.org/10.1051/parasite/2018059 journal article 10.1051/parasite/2018059 1776-1042 PMC6284406 30526819 12628634 EEFEB392-86FC-40ED-B8C3-01936A04C892 Cichlidogyrus reversati Pariselle & Euzet, 2003 Type host: Tilapia cabrae Boulenger, 1899 (now Pelmatolapia cabrae ). Other hosts: Coptodon tholloni (Poll & Thys van den Audenaerde, 1960) . Infection site: Gills. Type locality: Mouth of Bas Kouilou River , Congo . Other localities: Congo River at Nganda Flash station 06° 02001.800 S 12° 31048.200 E. Table 5. Measurements of Onchobdella ximenae n. sp. and O. voltensis . All measurements in µm as the average ± standard deviation, count and range (in parentheses). Material: Eight whole-mounted specimens in Malmberg’s solution.

Species	O. ximenae n. sp.	O. voltensis
Host	H. stellifer , H.	H. fasciatus , H.
elongatus	bimaculatus
Locality	4, 6 & 7	Volta Lake
Reference	Present study	Paperna [26]
Number of	12	7
specimens
Ventral Anchor
f	11, 5 ( 8 – 12 )	15–20
Dorsal Anchor
a	51, 6 ( 49 –54)	60–90
b	43, 6 ( 40 – 46 )	/
c	2, 6 ( 1 – 3 )	/
d	19, 6 ( 17 – 21 )	10–15
e	22, 6 ( 21 – 23 )	/
Uncinuli
uncinuli 1	/	10
uncinuli 2	13, 2 ( 12 – 13 )	/
uncinuli 3	13, 3 ( 12 – 15 )	/
uncinuli 4	13, 3 ( 12 – 14 )	/
uncinuli 5	13, 4 ( 11 – 13 )	/
uncinuli 6	13, 6 ( 11 – 15 )	/
Ventral Bars
x	34, 6 ( 29 – 43 )	20–40
Dorsal Bar
x	50, 5 ( 31 –69)	70–100
h	33, 5 ( 29 – 41 )	/
w	5, 6 ( 4 – 6 )	2–5
MCO
pe	66, 7 (60–70)	30–50
ap	22, 6 ( 19 – 26 )	25–30
he	3, 7 ( 2 – 5 )	N.A.
Vg
L	33, 2 ( 21 – 40 )	N.A.
l	3, 2 ( 2 – 3 )	N.A.

Vouchers: M. T . 38308–09, KN10043–45 https://laji.fi/en/ view?uri=luomus:KN.10043, https://laji.fi/en/view?uri=luomus: KN.10044, https://laji.fi/en/view?uri=luomus:KN.10045. Remarks ( Table 3 , Fig. 10 ) The eight recorded specimens of C. reversati from the Congo River had a dorsal bar length that was 9 µm longer on average and a total length of half the size compared with the specimens from the type locality. In the original drawing (see [33]), the accessory piece connected with the heel through a thin filament. However, this connection was not observed in the specimens from Lower Congo. In three specimens , an extension of the heel in another focal plane was observed and could correspond with the thin filamentous connection of the original description. Additionally, in three specimens , the distal ends of the accessory piece and the penis did not meet. Also, in all specimens, it was observed that the accessory piece has a ridge, which separates the distal hook from the C-shaped part. This ridge continues towards the basal bulb as a filament. Most proximally, it forms a separate structure that attaches separately to the basal bulb. This ridge was also observed on one paratype of C. reversati on the slide RMCA37.402 . However , the paratypes lost transparency due to the fixation in Malmberg’s and were difficult to observe in detail. On the seven other paratypes and vouchers, all collected by Pariselle & Euzet (2003) and deposited at the Royal Museum for Central Africa , Tervuren , Belgium , these structures were not observable. Because of this, the holotype , prepared with the same fixative, was not ordered from the Muséum national d’Histoire naturelle in Paris .