Acanthoatractis xinguensis Jesus and Melo, 2024

Jesus, Ronald Ferreira, Nandyara, Bianca, Santos, Jeannie Nascimento dos & Melo, Francisco Tiago de Vasconcelos, 2024, Acanthoatractis xinguensis n. gen., n. sp. (Nematoda: Cosmocercoidea: Atractidae) parasite of yellow-spotted Amazon river turtle, Podocnemis unifilis Troschel (Testudines: Podocnemididae) in Brazilian Amazon, International Journal for Parasitology: Parasites and Wildlife 24, pp. 100961-100961 : 100961-

Family Atractidae Railliet, 1917 (Travassos, 1919).

Acanthoatractis xinguensis Jesus and Melo n. gen., n. sp. ( Figs. 1–3 )

Type-host: Podocnemis unifilis Troschel, 1848 (Chelonia: Testudinae).

Type-locality: Xingu River (“Volta Grande” region) (3 ◦ 23′12.682″S 51 ◦ 44′58.315″W), Municipality of Vitoria ´do Xingu, Par´a, Brazil .

Type-specimens: Holotype ( CHIOC 39197 a), allotype ( CHIOC 39197 b) and 28 paratypes ( CHIOC 39197 c-39197d) were deposited in the helminthological collection of Oswaldo Cruz Institute - Rio de Janeiro, Brazil.

Site of infection: Stomach.

Prevalence: 33% (1 infected/3 examined).

ZooBank registration: To comply with the regulations set out in article 8.5 of the amended 2012 version of the International Code of Zoological Nomenclature ( ICZN, 2012), details of the new species have been submitted to ZooBank. The Life Science Identifier (LSID) for Acanthoatractis xinguensis n. gen., n. sp. Is urn:lsid:zoobank.org:act:ABE15A5D-A805-49BE-A544-DCBBDBA20EF6 .

Etymology: The species was named after the Xingu River, the type locality.

Figures

Fig. 1. Line drawings of Acanthoatractis xinguensis n. gen., n. sp. (Male) (A) Cephalic extremity, apical view. (B) Cephalic extremity, apical view, highlighting the oral opening surrounded by sclerotized pieces and the distribution of open end wrench-shaped sclerotized structures. (C) Anterior extremity of body, ventral view. (D) Whole body, lateral view. (E) Details of spicules. (F) Posterior extremity of body, ventral view.

Fig. 2. Line drawings of Acanthoatractis xinguensis n. gen., n. sp. (Female) (A) Posterior extremity of body, region of vulva and anus, lateral view. (B) Reproductive tract showing monodelphic uterus, lateral view.

Fig. 3. Scanning electron micrographs of Acanthoatractis xinguensis n. gen., n. sp. (A) Male, cephalic extremity, subapical view. (B) Anterior extremity of body, ventrolateral view. Inset: Detail of deirid, lateral view (Scale-bar: 10 μm); Detail of excretory pore, ventral view (Scale-bar: 10 μm). (C) Posterior extremity of male, ventrolateral, distribution of caudal papillae (arrowheads). Detail of phasmid, ventrolateral view (Scale-bar: 5 μm); Postcloacal papillae, ventrolateral view (Scalebar: 10 μm). (D) Posterior extremity of female, ventrolateral view, lines indicate vulva and anus. Abbreviations: Amphid, Am; anus, An; deirid, De; excretory pore, Ep; single median papilla, Sm; vulva, Vu.