Mymarothecioides altamirensis Soares & Domingues 2019, n. sp.
Creators: name: Soares, Geusivam B.
name: Magalhães, Keila X.
name: Silva, Ana Carolina
name: Carneiro, Jânio S.
name: Barbosa, Lucineia L.
name: Costa, Nayna G. S.
name: Domingues, Marcus V.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Monogenoidea
Dactylogyridea
Dactylogyridae
Mymarothecioides
Mymarothecioides altamirensis

description: Mymarothecioides altamirensis Soares and Domingues n. sp.
(Figs. 18–26; 44)
Type host: Hydrolycus armatus (Jardine & Schomburgk).
Site: Gills.
Type locality: Volta Grande, Xingu River, municipality of Altamira, Pará State, Brazil (03°21’15,7’’S; 52°11’47,5’’W), collected on June 13, 2015.
Prevalence: 100% of three hosts examined.
Mean intensity: 13 parasites per infected host.
Specimens deposited: Holotype, MPEG nº 189; 9 paratypes, MPEG n° 190–198.
Etymology: The specific name refers to the municipality of Altamira, Pará State, Brazil, where the type host was collected.
Zoobank Life Science Identifier: (LSID) for Mymarothecioides altamirensis n. sp. is urn:lsid:zoobank.org: act: EAF4D327-06BA-4D87-A9A2-91F7D1872401
Comparative measurements: see Table 3.
Description (based on ten specimens, four mounted in Hoyer, six mounted in Gomori’s trichrome): Body fusiform, total length excluding haptor 310 (187–400; n= 6), total width at level of germarium 82 (62–95; n=6) (Fig. 18). Cephalic margin tapered; moderately developed terminal lobes; three to four bilateral pairs of head organs with rod-shaped secretion; cephalic glands not observed. Accessory chromatic granules absent. Pharynx ovate, 23 (19–27; n= 6) long, 19 (16–20; n=6) wide. Testis saculiform, 72 (47–103; n=4) long, 37 (32–37; n=4) wide. Prostatic reservoir subspherical, posterior to MCO. MCO, 27 (26–28; n=2) long, with distal portion subtly expanded; base of MCO with sclerotized margin (Fig. 19, 44). Accessory piece comprising straight rod, distal portion with subterminal flap with hook, thumb. Germarium fusiform, 41 (16–55; n=3) long, 23 (22–24; n=3) wide. Eggs, Mehlis’ glands, seminal receptacle, ootype not observed. Vaginal aperture marginal (dextral), opening at level of vitelline commissure. Uterus delicate. Vitelline follicles dense. Peduncle broad; haptor subhexagonal, 93 (82–100; n=6) long, 94 (70–117; n=6) wide. Anchors dissimilar. Ventral anchor, outer 48 (47–49; n=3) long, inner 56 (54–59; n=3) long; base 22 (22–24; n=3); root tips covered with sclerotized cap variable in shape; heavily depressed superficial root, prominent deep root; slightly curved shaft and point; point extending just past level of the tip of the superficial root; distinct hump on superficial surface of base (Fig. 25). Dorsal anchor, outer 33 (28–38; n=2) long, inner 36 (33–39; n=2) long; base 19 (n=2), with distinct hump on its superficial surface; slightly depressed superficial root, root tip covered with sclerotized cap variable in shape; prominent deep root; slightly curved shaft and point; point extending just past level of tip of superficial root (Fig. 26). Ventral bar 72 (70–76; n=3) long, 13 (11–16; n=2) wide, slightly curved rod with anteromedial projection, rounded ends (Fig. 23). Dorsal bar, 49 (47–50; n=3) long, 6 (5–6; n=3) wide, broadly U-shaped rod with rounded ends (Fig. 24). Hooks similar in shape, with upright thumb, rounded, short shaft, slightly curved shaft and point, shank divided into two units; filamentous hook loop not observed; hook pairs 1–4, 21 (20–27; n=21) long; hook pairs 6– 7 (Fig. 22), 25 (28–30; n=9) long (Fig. 20); hook pair 5, 20 (n=2) long, shank with proximal dilatation comprising approximately 1/3 of the shank length (Fig. 21) pairs 6– 7, 25 (28–30; n=9) long (Fig. 22).
Remarks: Mymarothecioides altamirensis n. sp. differs from all other congeneric species by having a ventral anchor with a distinct hump on the superficial surface of its base and a heavily depressed superficial root.
description: Published as part of Soares, Geusivam B., Magalhães, Keila X., Silva, Ana Carolina, Carneiro, Jânio S., Barbosa, Lucineia L., Costa, Nayna G. S. & Domingues, Marcus V., 2019, Monogenoids (Polyonchoinea, Dactylogyridae) from Hydrolycus armatus (Characiformes, Cynodontidae) with the description of a new species of Rhinoxenus and the proposal of a new genus from the Xingu River, Pará, Brazil, pp. 229-245 in Zootaxa 4700 (2) on pages 236-238, DOI: 10.11646/zootaxa.4700.2.3, http://zenodo.org/record/3548428