Anacanthorus acrophallus Santos Neto & Muriel-Cunha & Domingues 2019, sp. n.
Creators: name: Santos Neto, João F.
name: Muriel-Cunha, Janice
name: Domingues, Marcus V.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Monogenea
Dactylogyridea
Dactylogyridae
Anacanthorus
Anacanthorus acrophallus

description: Anacanthorus acrophallus sp. n.
(Figs. 23–25)
Type-host: Hoplerythrinus unitaeniatus (Spix & Agassiz), Erythrinidae.
Site of infection: Gills.
Type-locality: Igarapé Arinandeua—Guamá River, municipality of São Miguel do Guamá, State of Pará, Brazil (1°37’42.50”S 47°29’45.06”W).
Prevalence: 66% of three hosts examined.
Mean intensity: 1,5 parasites per host examined.
Specimens deposited: Holotype: CHIOC no. 40024. 2 paratypes: CHIOC nos. 40025 a–b.
ZooBank registration: The Life Science Identifier (LSID) urn: lsid:zoobank.org:act: DFCCF79B-0944-4AC9- A9DB-4391828B8C1B.
Etymology: The specific epithet derives from the Greek (acro = point + phallus = penis) and refers to the MCO morphology, based on the presence of a pointed flap in its distal portion.
Description: (Based on three specimens mounted in Hoyer’s). Body fusiform 468 (425–512; n=2) long, excluding the haptor, 117 (115–120; n=2) wide at the height of germarium. Four cephalic lobes developed; three groups of head organs; cephalic glands not observed. Two pairs of ocelli, posterior pair slightly bigger than the anterior pair; accessory granules not observed. Pharynx oval 45 (36–60; n=3) long; 34 (27–47; n=3) wide; oesophagus moderately elongated. Two intestinal caeca confluent and posterior to the gonads. Genital pore not observed. MCO 27 (26–29; n=3) long, 10 (9–11; n=3) wide, sclerotized and short, with a small pointed sinistral flap (ventral view) (Fig. 23); accessory piece absent (Fig. 23). Seminal vesicle, germarium, prostatic reservoir and testicles not observed. Uterus with anterior portion slightly sclerotized. Haptor 57 (50–65; n=3) long, 74 (47–95; n=3) wide. Peduncle short or elongated. Similar 4A hooks with portion posterior slightly dilated 14 (n=1) long (Fig. 24). Seven pairs of similar hooks 23 (22–24; n=3) long; blade relatively long and recurved, point short and curved, shank with proximal dilatation 6 (6–7; n=3) long, comprising 1/3 of the total shank length, thumb robust and depressed (Fig. 25). Hook filament delicate, extending until the half of the shank, proximal to the dilatation (Fig. 25).
Remarks: Anacanthorus acrophallus sp. n. is similar to Anacanthorus scyphophallus sp. n. and A. brevicirrus due to the presence of a short and tubular MCO. However, Anacanthorus acrophallus sp. n. differs from Anacanthorus scyphophallus sp. n. mainly by the hook morphology since Anacanthorus acrophallus sp. n. has hooks with shank showing a proximal and robust dilatation, comprising 1/3 of the shank length, and a short, extended and slightly depressed thumb. On the other hand, Anacanthorus scyphophallus sp. n. has hooks shank with shank showing a proximal dilatation comprising ½ of the shank length, and a rounded and short thumb. Anacanthorus brevicirrus differs from Anacanthorus acrophallus sp. n. also by the hook morphology since it has a small bulb with a translucid spot in the proximal portion of the shank, which is not found in Anacanthorus acrophallus sp. n.
description: Published as part of Santos Neto, João F., Muriel-Cunha, Janice & Domingues, Marcus V., 2019, New species of Anacanthorus (Dactylogyridae: Anacanthorinae) from the gills of Hoplerythrinus unitaeniatus and Erythrinus erythrinus (Characiformes: Erythrinidae) of the coastal drainage in the Eastern Amazon, Brazil, pp. 303-320 in Zootaxa 4615 (2) on page 315, DOI: 10.11646/zootaxa.4615.2.4, http://zenodo.org/record/3244704