A new species of Paraberrapex Jensen, 2001 (Cestoda: Lecanicephalidea) from Squatina guggenheim Marini (Squatiniformes: Squatinidae) off Argentina

Abstract

Paraberrapex atlanticus sp. n. (Cestoda: Lecanicephalidea) is described from the spiral intestine of the angel shark Squatina guggenheim Marini from coastal waters off Buenos Aires Province, Argentina. Paraberrapex atlanticus sp. n. can be distinguished from the only species described in the genus, P. manifestus Jensen, 2001 in having cocoons 5-6 times longer with more eggs per cocoon, the extension of the uterine duct, the distribution of vitelline follicles, and the size and density of microtriches on the bothridial surfaces. The presence of P. atlanticus sp. n. in S. guggenheim confirms the specificity of Paraberrapex Jensen, 2001 for squatiniform sharks.

Tapeworms (Platyhelminthes, Cestoda) from marine chondrichthyans of the Southwestern Atlantic Ocean, and the sub-Antarctic and Antarctic islands: a checklist

“…Cestodes as parasites of chondrichthyans have been mostly recorded in the Northern Hemisphere ( Caira et al 2022 ). However, reports in southern latitudes have remarkably increased in the last decades due to focused sampling efforts in the area ( Menoret and Ivanov 2012a , b , 2014 , 2015 , 2021 ; Pickering and Caira 2012 ; Caira et al 2013a ; Abbott and Caira 2014 ; Mutti and Ivanov 2016 ; Menoret et al 2017 ; Franzese and Ivanov 2018 , 2020a , b , 2021 ; Palm et al 2019 ; Oosthuizen et al 2021 ; Franzese et al 2022 ; Van Der Spuy et al 2022 ). The present annotated checklist comprises 57 valid cestode species of 28 genera in nine orders, registered in the Río de la Plata estuary, Southwestern Atlantic off Argentina and the surrounding waters off Antarctica.…”

Annotated checklist of fish cestodes from South America

“… Squatina guggenheim ( Elasmobranchii : Squatinidae ); marine; spiral valve; adult; Magellanic, WTSA ; Argentina ( Mutti and Ivanov 2016 ).…”

New species of Aberrapex Jensen, 2001 (Cestoda: Lecanicephalidea) from eagle rays of the genus Myliobatis Cuvier (Myliobatiformes: Myliobatidae) from off Argentina

“…between latitudes of 40°N and 40°S) (Caira and Jensen 2014). At the southern limit of their distribution in the western Atlantic Ocean, only two species have been reported, Aberrapex arrhynchus (Brooks, Mayes et Thorson, 1981) from Myliobatis goodei Garman and Paraberrapex atlanticus Mutti et Ivanov, 2016 from Squatina guggenheim Marini (see Brooks et al 1981, Mutti and Ivanov 2016. Aberrapex arrhynchus was originally described as Discobothrium arrhynchum Brooks, Mayes et Thorson, 1981 redescribed this species based on type specimens and transferred it to Aberrapex .…”