Falcaustra sanjuanensis sp. nov. (Nematoda: Kathlaniidae) from Odontophrynus cf. barrioi (Anura: Cycloramphidae) from Argentina

Abstract

Here, we describe a new kathlaniid nematode, Falcaustra sanjuanensis sp. nov., from the large intestine of Odontophrynus cf. barrioi (Anura: Cycloramphidae), from San Juan Province, Argentina. The new species belongs to the Falcaustra group that possesses a pseudosucker. It resembles F. andrias in the distribution pattern of caudal papillae (six precloacal, four adcloacal, 12 postcloacal, one unpaired median anterior to the cloaca) but differs from F. andrias in the following characters: the longer size of males and females (11.17-13.45 mm and 10.1-15.5 mm, respectively); the longer size and form of the gubernaculum (0.17-0.23 mm, triangular form); the arrangement of postcloacal papillae (three pairs on the ventral side, two pairs on the lateral side, one pair on the subventral side) and unpaired papilla anterior to the cloaca located on the protuberance. The species description is based on light microscopy and scanning electron microscopy (SEM). Falcaustra sanjuanensis sp. nov. represents the 12th Neotropical species assigned to the genus. Also, we added a key to Neotropical species of Falcaustra.

A hundred-year-old mystery—the reproductive mode and larval morphology of the enigmatic frog genus Allophryne (Amphibia; Anura; Allophrynidae)

“…In tadpoles of Allophryne ruthveni , the m. levator mandibulae externus is present in two slips, with the superficialis inserting in the adrostral tissue mass, and the profundus inserting on the suprarostral ala. Given the presence of these two slips in leptodactylids (e.g., Haas 2003 ; Vera Candioti 2007 ; Vera Candioti et al 2007 ), odontophrynids (e.g., Haas 2003 ; Gonzalez et al 2014 ; Dias et al 2019 ; Dias 2020 ), and bufonids (e.g., Haas 2003 ; Vera Candioti 2007 ; Aguayo et al 2009 ; Haad et al 2014 ), the loss of the secondary slip of the m. levator mandibulae externus is a putative synapomorphy of Centrolenidae.…”

A new species of Aplectana (Nematoda: Cosmocercidae) parasite of Pleurodema nebulosum (Anura: Leptodactylidae) from the Monte desert, Argentina, with a key to Neotropical species of the genus Aplectana

“…The information available on metazoan parasites of the herpetofauna from the Monte desert in Argentina mostly refers to helminth species found in reptiles (Ramallo and Díaz, 1998;Ramallo et al, 2002a;2002b;2016a;2017;Goldberg et al, 2004). Regarding helminths found in amphibians, González et al (2013a) described the nematode Falcaustra sanjuanensis González, Sanabria and Quiroga, 2013 from the large intestine of Odontophrynus cf. barrioi and González et al (2013b) reported the nematode Aplectana hylambatis (Baylis, 1927) Travassos, 1931 from the large intestine of Rhinella arenarum Hensel, 1867.…”