A new species of Comephoronema (Nematoda: Cystidicolidae) from the squirrelfish Holocentrus adscensionis (Beryciformes: Holocentridae) off Brazil

Abstract

Abstract:A new nematode species, Comephoronema multipapillatum sp. n. (cystidicolidae), is described from the anterior intestine and caecum of the squirrelfish Holocentrus adscensionis (osbeck) (Beryciformes: Holocentridae) collected in Angra dos reis, state of rio de Janeiro, offshore Brazil. the new species was placed in Comephoronema layman, 1933 by having an oval oral aperture, four submedian labia, four bilobed submedian sublabia, two narrow lateral pseudolabia and four single cephalic papillae, but mainly by numerous precloacal papillae in males (more than six pairs), in which it differs from species of the otherwise morphologically similar genus Ascarophis van Beneden, 1871. Comephoronema multipapillatum sp. n. can be easily distinguished from other congeners based on the high number of precloacal papillae in males (18 pairs + one unpaired) and also by the bidentate plate structure on the inner margin of pseudolabia, mature eggs with two long filaments on a single pole, body length of male (9.4-11.5 mm) and female (10.2-19.9 mm), left spicule size (222-278 µm) and length ratio of spicules (1 : 2.2-2.8). this is the fifth nominal species of Comephoronema, the first nematode registered parasitizing H. adscensionis and the first species of the genus in the Neotropical part of the Atlantic ocean.

Genetic characterisation of Tanqua (von Linstow, 1879) (Nematoda: Gnathostomatidae) larval forms including new host and locality records

“…6 B of the publication. The entire body, of all of the 12 specimens used for DNA extraction in the present study, were heavily annulated and although characteristic of a number of other genera of nematodes ( Moravec et al, 2007 ; Pereira et al, 2014 ; Velarde-Aguilar et al, 2015 ; Ocampo-Salinas et al, 2021 ), are also described in adult Tanqua tiara ( Sou, 2020 ). Specimens identified as Tanqua sp.…”

Review of the parasitic nematodes of marine fishes from off the American continent

“…Timi and Sardella, 2002; Timi and Lanfranchi, 2006; Timi et al ., 2006, 2007, 2009; Rossin and Timi, 2009; Rossin et al ., 2012), Brazil (e.g. Santos et al ., 2004; Pereira et al ., 2012, 2013, 2014 a , 2014 b , 2014 c ; Paschoal et al ., 2014; Vieira et al ., 2015) and Mexico (e.g. González-Solís et al ., 2002 a , 2002 b , 2007 a , 2007 b ; Gopar-Merino et al ., 2005; Mejía-Madrid and Pérez-Ponce de León, 2007; López-Caballero et al ., 2009; Mejía-Madrid and Guillén-Hernández, 2011), as well as from USA in collaboration with the renowned Czech taxonomist of nematode parasites of fish Dr František Moravec (e.g.…”