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

Abstract

Two species ofAcanthobothrium(Onchoproteocephalidea: Onchobothriidae) are described from the spiral intestine ofNarcineentemedorJordan & Starks, 1895, in Bahía de Acapulco, Acapulco, Guerrero, Mexico. Based on the four criteria used for the identification of species ofAcanthobothrium,A.soniaesp. nov.is a Category 2 species (less than 15 mm in total length with less than 50 proglottids, less than 80 testes, and with the ovary asymmetrical in shape).Acanthobothriumvidalisp. nov.is a Category 6 species (more than 15 mm in total length with more than 50 proglottids, fewer than 80 testes, and the ovary is asymmetrical). The new species differ from similar species from the Pacific Ocean by total length, the number of proglottids, diameter of the accessory sucker, the length of the cirrus sac, the number of testes per proglottid and the measurements of hooks. With the recognition ofA.soniaesp. nov.andA.vidalisp. nov., 42 species ofAcanthobothriumhave been reported from the Pacific coast of the Americas. This is the first report of species ofAcanthobothriumfrom a member ofNarcinefrom Mexico and it brings the number of species reported from elasmobranchs from the Pacific Coast of Mexico to 13.

Four new species of Acanthobothrium van Beneden, 1849 (Cestoda: Onchoproteocephalidea) from the spotted skate, Raja straeleni Poll, off the Western Cape, South Africa

“…The present study marks the first to report species of Acanthobothrium from South Africa. With the addition of these four species, a total of 207 valid species of Acan thobothrium are currently recognised worldwide , Franzese and Ivanov 2018, 2020, Maleki et al 2018, Rodríguez-Ibarra et al 2018, Zaragoza-Tapia et al 2019, 2020, making the taxonomic classification of new species, and intrageneric comparisons between congeners within this genus taxing (Ghoshroy and Caira 2001). Hence, in the interest of simplifying this matter, Ghoshroy and Caira (2001) have developed a category classification system on the basis of four morphological characteristics.…”

“…n. is identified as a category 2 species according to specifications set by Ghoshroy and Caira (2001). At present, 47 species of Acanthobothrium recognised as category 2 species were reported worldwide (Maleki et al 2013, Yang et al 2016, Zaragoza-Tapia et al 2019, 2020. Additionally, Franzese and Ivanov (2020) recognised two more species belonging to both category 1 and 2 as a result of intraspecific variability observed in ovarian symmetry.…”

Morphological variation in the hyperapolytic lecanicephalidean species Anteropora japonica (Yamaguti, 1934) (Eucestoda)

“…However, Pentaloculum macrocephalum Alexander, 1963, from the blind electric ray, Typhlonarke aysoni (Hamilton) (Torpediniformes, Narkidae), is euapolytic (Eudy et al 2019). Only six of the almost 200 valid species of Acanthobothrium (see Caira et al 2017, Franzese and Ivanov 2018, Maleki et al 2018, Rodríguez-Ibarra et al 2018, Zaragoza-Tapia et al 2019 are considered to be hyperapolytic (see Franzese and Ivanov 2018). Five of these six hyperapolytic species of Acanthobothrium, namely A. lintoni Goldstein, Henson et Schlicht, 1968, A. indicum Subhapradha, 1955, A. pearsoni Williams, 1962, A. stefaniae Franzese et Ivanov, 2018, and A. margieae Fyler, 2011, in fact, parasitise either torpediniform rays or orectolo- (Yamaguti, 1934).…”

“…However, there are two other species of Acanthobothrium in orectolobiform sharks (i.e., A. brayi Campbell et Beveridge, 2002 andA. edmondsi Campbell et Beveridge, 2002;Campbell and Beveridge 2002) and 13 additional species of Acanthobothrium in torpediniform rays (Baer 1948, Yamaguti 1952, Riser 1955, Yamaguti 1959, Brooks and Mayes 1978, Marques et al 1997, Caira and Burge 2001, Campbell and Beveridge 2002, Zaragoza-Tapia et al 2019, all of which are euapolytic.…”

Host relationships and geographic distribution of species of Acanthobothrium Blanchard, 1848 (Onchoproteocephalidea, Onchobothriidae) in elasmobranchs: a metadata analysis

“…Acanthobothrium Blanchard, 1848 (Onchoproteocephalidea) is the most diverse genus that has been reported as parasite of the spiral intestine of elasmobranchs (Caira and Jensen 2017). At the present time, 201 species of Acanthobothrium are considered to be valid (Maleki et al 2013;Caira and Jensen 2017;Rodríguez-Ibarra et al 2018;Franzese and Ivanov 2018;Maleki et al 2019;Zaragoza-Tapia et al 2019, 2020. The genus consists of species that exclusively parasitize elasmobranchs as adults and, in many cases, individual species are thought to parasitize only a single species of elasmobranch (Caira 2011;Caira and Jensen 2017).…”