Redescription of Allobenedenia dischizosepta (Suriano, 1975) n. comb. (Monogenoidea: Capsalidae: Trochopodinae) from the Gills of Argentine Sea Basses (Acanthistius) in the Southwestern Atlantic Ocean

ESTEFANÍA BAGNATO; STEPHEN ASH BULLARD; FLORENCIA CREMONTE

COMPARATIVE PARASITOLOGY

HELMINTHOLOGICAL SOC WASHINGTON, C/O ALLEN PRESS INC

Lugar: Kansas; Año: 2017 vol. 84 p. 111 - 118

1525-2647

We herein redescribe Allobenedenia dischizosepta (Suriano, 1975) n. comb. (Monogenoidea: Capsalidae) basedon light microscopic analysis of the holotype and 18 paratypes from the gill of Acanthistius brasilianus (Cuvier, 1828)(Perciformes: Serranidae) along with light and scanning electron microscopy of 25 newly collected specimens from thegill of Acanthistius patachonicus (Jenyns, 1842) (new host record) in the southwestern Atlantic Ocean off Argentina.Contradicting the original description of this species and its generic diagnosis, all specimens had 5 loculi (2 anterior plus 3posterior loculi) plus 5 corresponding haptoral septa only (central loculus absent). The original description of this specieserroneously specified 6 loculi, including 2 small anterolateral loculi. Because A. dischizosepta was the type species forTetrasepta Suriano, 1975 and because it fits the diagnosis of Allobenedenia Yamaguti, 1963, the genus therefore is regardeda junior synonym of Allobenedenia. Allobenedenia dischizosepta differs from its congeners by lacking a haptoral peduncleas well as by having 5 haptoral loculi, accessory sclerites that lack a conspicuous dorsal protuberance and that are weaklybifid, by posssesing robust anterior hamuli that are strongly recurved for half of their total length, by having a male accessorygland reservoir in the extreme posterior portion of the penis sac and lateral to the vitelline reservoir abutting the ovary, andby the presence of a straight (not coiled) proximal portion of the ejaculatory duct within the penis sac.