Tresuncinidactylus wilmienae, Přikrylová & Barson & Shinn, 2021

Přikrylová, Iva, Barson, Maxwell & Shinn, Andrew P., 2021, Description of Tresuncinidactylus wilmienae gen. et sp. n. (Monogenea: Gyrodactylidae), from the gills of the bulldog, Marcusenius macrolepidotus (Peters) from Lake Kariba, Zimbabwe, Folia Parasitologica (025) 68, pp. 1-12 : 4-5

Tresuncinidactylus wilmienae gen. et sp. n Figs. 1 , 2

ZooBank number for species:

urn:lsid:zoobank.org:act:E36CE744-A54F-4531-8BA5-ECAFD4A4DFE3

Description. Coverslip-flattened specimens 550–755 (606, n = 6) long, 103–127 (114, n = 6) wide at level of the uterus. Pharynx muscular bulb 35–48 (43, n = 7) long and 38–45(41) wide; anterior bulb of pharynx with eight, short pharyngeal processes. Excretory bladders present. MCO observed in three specimens; MCO muscular pouch, 19–24 (21, n = 3) long, 13–14 (13, n = 3) wide, armed with 30 gracile spines. Hamuli total length 140–154 (146, n = 8), point length 45–53 (50, n = 8), shaft length 125–134 (129, n = 8), root length 28–32 (30, n = 8). Dorsal bar 16–19 (18, n = 6) long and 2–3 (2, n = 6) width. Ventral bar 13–16 (14, n = 7) wide, 7–10 (8, n = 7) long. Marginal hooks (large anterior positioned pairs): handle length 19–23 (22, n = 21); sickle length 20–23 (21 n = 22); ratio handle: sickle 1.0–1.1 (1.0); sickle loop length 25–28 (26, n = 22); sickle proximal width 12–16 (14, n = 22); sickle point length 10–12 (11, n = 22). Marginal hooks (median lateral positioned pairs): handle length 13–17 (15, n = 16); sickle length 14–16 (15, n = 18); ratio handle: sickle 1.0–1.1 (1.0); sickle loop length 18–21 (19, n = 17); sickle proximal width 9–12 (10, n = 17); sickle point length 7–9 (8, n = 16). Marginal hooks (small posterior positioned pairs): handle length 11–13 (12, n = 17); sickle length 11–13 (12, n = 16); ratio handle: sickle 1–1.1 (1.0); sickle loop length 15–17 (16, n = 17); sickle proximal width 8–12 (9, n = 17); sickle point length 6–7 (7, n = 17).

T y p e h o s t: Marcusenius macrolepidotus (Peters) ( Osteoglossiformes : Mormyridae ).

Ty p e l o c a l i t y: Lake Kariba, Zimbabwe (-16.5270, 28.847344)

T y p e m a t e r i a l: Holotype, one paratype and one hologenophore deposited in the Helminthological Collection of the Institute of Parasitology , the Biology Centre of the Czech Academy of Sciences , České Budějovice , Czech Republic (M-758). Another two specimens, one paratype and one hologenophore, in the parasitological collection in the National Museum , Bloemfontein , South Africa ( NMB P 798 and 799), and two additional paratype specimens deposited in the parasite collection of the Royal Museum for Central Africa, Tervuren, Belgium ( RMCA VERMES 43423 and 43424).

S i t e o n t h e h o s t: Gill filaments.

M o l e c u l a r s e q u e n c e d a t a: Three specimens were successfully sequenced and the longest sequence for each region was deposited in the nucleotide database GenBank under accession numbers MZ479697 and MZ474665 for ITS and 18S rDNA , respectively. The 18S rDNA sequence was 1,864 bp long and ITS rDNA 669 bp; the latter consists of partial ITS1- 291 bp, 5.8S- 157 bp, and partial ITS2-221bp.

E t y m o l o g y: The species is named in honour of Wilmien Luus-Powell from the University of Limpopo, a close friend and colleague of the principal author, for her endless support and enormous contribution to research on the Monogenea in African freshwater fishes.

Figures

Fig. 1. Line drawings of Tresuncinidactylus wilmienae gen. et sp. n. from Marcusenius macrolepidotus (Peters).A – hamuli; B – ventral bar; C – details of hamuli roots and dorsal bar; D – pharynx; E – marginal hooks; F – male copulatory organ.

Fig. 2. Light microscope photographs of Tresuncinidactylus wilmienae gen. et sp. n from Marcusenius macrolepidotus (Peters). A – opisthaptor; B – hamuli root, ventral and dorsal bars details; C – male copulatory organ.