Nagmia rodmani n. sp., Nagmia cisloi n. sp., and Probolitrema richiardii (López, 1888) (Gorgoderidae: Anaporrhutinae) from Elasmobranchs in the Gulf of California, Mexico

Abstract

The generic diagnosis of Nagmia Nagaty, 1930, is emended to include species having some vitelline follicles extending into the extracecal space. Two new species belonging in the genus are described from the Gulf of California: Nagmia rodmani n. sp. from the body cavity of the giant electric ray, Narcine entemedor Jordan and Starks, 1895, and Nagmia cisloi n. sp. from the body cavity of the smoothtail mobula, Mobula thurstoni (Lloyd, 1908). Both species are distinguished from each other and the 13 other known congeners by the number of testicular follicles, ratio of widths of oral sucker to ventral sucker, and position of the vitelline follicles relative to the ceca. Nagmia rodmani is distinct based on the combined features: 12-17 follicles per testis, sucker width ratio of 1:1.7-2.0, vitelline follicles extending into the extracecal space, and the excretory vesicle being I-shaped and lacking perpendicular lateral branches along the main stem. Nagmia cisloi is distinct based on the combined features: 23-26 follicles per testis, body measuring 13.4 mm long by 14.6 mm wide, eggs measuring 47-48 lm long by 43-47 lm wide, and the excretory vesicle is I-shaped and has lateral perpendicular branches along the main stem. Supplemental data are provided for the anaporrhutine species Probolitrema richiardii (López, 1888) collected from a variety of rays in the Gulf of California. Our specimens are indistinguishable from those described as Probolitrema californiense Stunkard, 1935, and Probolitrema mexicana Markell (1956), both of which previously had been synonymized under P. richiardii. Checklists of parasites reported from N. entemedor and M. thurstoni are provided.

Integrative taxonomy of Anaporrhutum mundae sp. nov. (Trematoda: Gorgoderidae), a parasite of the Munda round ray Urotrygon munda (Urotrygonidae) in Costa Rica

“…The specimens described here agree well with the diagnostic morphological characters of the genus Anaporrhutum as described by Curran et al (2003) and Campbell (2008). In particular, the main characters used for their identification as belonging to Anaporrhutum were the caeca without diverticula, the testicular follicles traversing the caeca, the vitellaria medial or ventral to the caeca, and the H-shaped excretory vesicle.…”

“…Anaporrhutum mundae sp. nov. most closely resembles A. euzeti, which was described from the Gulf of California (Mexico) in Myliobatis longirostris Applegate & Fitch, Narcine entemedor Jordan & Starks, Hypanus dipterurus (Jordan & Gilbert) and Urobatis maculatus Garman (Curran et al 2003). However, A. mundae sp.…”

“…Members of the family Gorgoderidae infecting elasmobranchs belong to five genera within the subfamily Anaporrhutinae Loss, 1901. These are Anaporrhutum, Nagmia, Petalodistomum Johnston, 1913, Probolitrema Looss, 1902, and Staphylorchis Travassos, 1922(Curran et al 2003Cutmore et al 2010). In the most recent review of Gorgoderidae, most of genera of Anaporrhutinae were divided into a number of subgenera (see Campbell 2008); however, because none of the subgenera proposed have received general acceptance by the scientific community (Cutmore et al 2010(Cutmore et al , 2013, we follow in recognising them as full genera.…”

“…Currently, there are seven recognized species of Anaporrhutum. These are: A. albidum Brandes in Ofenheim, 1900, A. mantae Nagaty & Abdel-Aal, 1961, A. stunkardi Tandon, 1969, A. narayani Simha, Rao & Rao, 1971, A. sinicum Cao, 1990, A. torpedoense Khan & Begum, 1991, and A. euzeti Curran, Blend & Overstreet, 2003(von Ofenheim 1900Nagaty and Abdel 1961;Tandon 1969;Simha et al 1971;Cao 1990;Khan and Begum 1991;Curran et al 2003) Nagaty and Abdel 1961;Tandon 1969;Simha et al 1971;Cao 1990;Khan and Begum 1991). Anaporrhutum mundae sp.…”

Two new species of Acanthobothrium Blanchard, 1848 (Onchobothriidae) in Narcine entemedor Jordan & Starks, 1895 (Narcinidae) from Acapulco, Guerrero, Mexico

“…Five valid species of Acanthobothrium have been reported worldwide from three species of Narcine (Table 5) (Subhapradha, 1955; Goldstein et al 1969; Brooks and Mayes 1978; Marques et al 1997b), but no species of Acanthobothrium in Narcine have been reported from Mexico (Merlo-Serna and García-Prieto 2016). In Mexico, only two species of helminth have been reported previously from Narcine : Anaporrhutumeuzeti Curran, Blend & Overstreet, 2003 and Nagmiarodmani Curran, Blend & Overstreet, 2009 (Curran et al 2003; Curran et al 2009).…”