Corresponding author: Walter A. Boeger (
Editorial responsibility: Antoine Pariselle
During a survey of monogenoid parasites from the freshwaters of the Peruvian Amazon, 20 specimens of a new genus and species were collected from the cichlid
Twenty fish specimens were collected in March 2018 by local fishermen in the “Shiruy Caño” in the Nanay River, in Iquitos, Peru. Symbiotypes (
Illustrations were prepared with the aid of a drawing tube and a micro-projector attached to an Olympus BX 50 microscope (both phase contrast and DIC). Measurements were made following the procedures of
The generic epithet derived from the genus of the host,
“Shiruy caño” in the Nanay River (
Holotype: INPA 785a. 16 Paratypes: INPA 785 b-g, INPA 797 a-j.
Gill filaments.
35% (7 fish parasitized of 20 sampled).
1.57.
(based on 17 specimens: 6 stained, 11 cleared): Body fusiform, 446 (418–496; n = 6) long, greatest width 124 (111–144, n = 6) at level of germarium. Cephalic region with two pairs of lobes, head organs. Eyespots 4, anterior pair smaller than posterior pair; granules small, ovate; accessory granules scattered in cephalic region. Pharynx spherical, 23 (18–27, n = 6) in diameter; esophagus short, inconspicuous. Testis ovate, 67 long (n = 1), posterior to germarium; vas deferens loops left intestinal caecum; seminal vesicle elongate; prostatic reservoirs 2, pyriform; smaller prostatic reservoir with thick walls. MCO 24 (20–27, n = 6) long, sclerotized, coiled, with about two clockwise rings, base with short sclerotized fringe, tip funnel-shaped. Accessory piece elongate, 19 (14–19, n = 6) long, with submedian thumb-like projection, articulated with MCO by delicate process. Germarium 39 long (n = 1), ovate. Uterus not observed. Vagina dextral, a sclerotized proximally funnel-shaped tube; atrium sclerotized; seminal receptacle immediately anterior to germarium, globose. Vitelline follicles dense, overlapping caeca, reaching peduncle. Haptor subcircular. Hooks of hook pair 1 more robust than remaining, with straight shaft, inconspicuous point, inconspicuous thumb, shank with fringe-like expansion on proximal, veil-like sclerotization on proximal portion of shank; hooks of hook pairs 2–7 with similar morphology of shaft, point, thumb (erected conspicuous thumb, slightly curved shaft, short point); shaft variably expanded among hook pairs through; hook pairs 2, 3, 6, 7 with sclerotized expansions on distal end, variable in length, especially long in hook pair 7 (longer than hook length); hook pairs 4, 5 lacking sclerotized expansions on proximal end; hook pair 5 comparatively more delicate than remaining hook pairs. Hook pair 1, 35 (32–37, n = 6) long (including cuticular expansion whenever present); hook pair 2, 23 (21–24, n = 6) long; hook pair 3, 15 (15–19, n = 6); hook pair 4, 15 (15–20, n = 6) long; hook pair 5, 14 (14–17, n = 6) long; hook pair 6, 20 (18–22, n = 6) long; hook pair 7, 42 (41–43, n = 6) long. Bars elongate, distinct. Ventral bar halter-shaped with anterior, posterior grooves, 54 (48–60, n = 6) long. Dorsal bar more delicate, with extremities slightly recurved posteriorly, 65 (62–68, n = 6) long. Ventral anchor 47 (42–51, n = 6) long, base 5 (3–6; n = 6) wide, with elongate superficial root, with slightly recurved tip, short round deep root, evenly curved shaft, point. Dorsal anchor, 30 (27–33, n = 6) long, base 17 (12–20, n = 6) wide, with robust superficial root with small digitiform tip, short deep root, shaft. Eggs not observed.
The specific epithet “
Species of five genera have been reported from native species of
The phylogenetic relationships of
As suggested by
Hence, there is a great possibility that the community of monogenoids in each geographic area derive from distinct processes resulting in a mosaic structure (
When
We thank the project Acuicultura of the Instituto de Investigaciones de la Amazonía Peruana for their assistance in the field study. The study was partially supported by a grant of the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil. WAB is a research associate of CNPq, Brazil.