Three New Genera and Six New Species of Lecanicephalideans (Cestoda) from Eagle Rays of the Genus Aetomylaeus (Myliobatiformes: Myliobatidae) from Northern Australia and Borneo

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

“…Considering that most species of Squatina occur in small areas and transoceanic migrations are thought to be extremely unlikely (see Stelbrink et al 2010), and that, to date, Paraberrapex has been only reported from species of Squatina in the western hemisphere, it is possible that Paraberrapex is restricted to the waters surrounding North and South America. Curiously, the trypanorhynch species Grillotia (C.) carvajalregorum Menoret et Ivanov, 2009 has also been reported from S. californica and S. guggenheim in the northeastern Pacific and the southwestern Atlantic, respectively (see Menoret and Ivanov 2009, 2012, Beveridge and Campbell 2010. Actually, G. (C.) carvajalregorum co-occurs with P. atlanticus, being collected from the same host individuals.…”

“…The vast majority of lecanicephalidean diversity is in the Indo-Pacific region (Jensen 2005, 2006, Koch et al 2012, Mojica et al 2013, Cielocha et al 2014. Generic and species diversity is greatest in tropical waters, diminishing in temperate zones (Jensen 2005), and no records of lecanicephalideans exist in cold waters.…”

“…They have been found in all batoid orders, except in Rajiformes, with great generic diversity in Dasyatidae and Myliobatidae . Most batoids along the coast off Argentina are rajiform skates (69%) (Cousseau et al 2010 , 2006, Koch et al 2012, Paraberrapex is restricted to Squatiniformes (Jensen , 2006: Paraberrapex manifestus is a parasite of Squatina californica in the Gulf of California, and P. atlanticus was found in S. guggenheim off Argentina. Among the 22 valid species of Squatina Dumèril (see Vaz andDe Carvalho 2013, Froese andPauly 2015), only five species have been reported as parasite hosts.…”

“…Parabarrapex along with Aberrapex are unique lecanicephalideans in their scolex configuration; they lack an apical organ and apical modification of the scolex proper (Jensen , 2005. Despite their similarity in the scolex configuration, Paraberrapex can be distinguished from Aberrapex on the basis of a vagina that is medial in position rather than lateral throughout its length in the proglottid, an ovary that is bilobed rather than tetralobed in cross section, and acetabular surfaces covered with slender gladiate and coniform spinitriches rather than hastate spinitriches , 2005, Koch et al 2012.…”

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

“…The four species currently valid in Aberrapex parasitise myliobatiform batoids of the genera Taeniura Müller et Henle, Aetomylaeus Garman and Myliobatis Cuvier from tropical and temperate waters , 2005, 2006, Koch et al 2012. Among these host genera, only species of Myliobatis have been reported from Argentine waters (i.e.…”