Monoecocestus sp.1

Martins, Natalia Beatriz Guerreiro, Robles, María Del Rosario, Navone, Graciela Teresa & Callejón, Rocío, 2023, Monoecocestus (Cestoda: Anoplocephalidae) diversity in Sigmodontinae rodents characterized by morphology and molecular methods, Zootaxa 5380 (1), pp. 37-55 : 44-46

Monoecocestus sp.1

Description (based on two specimens): Scolex 0.10; 0.11 long by 0.14; 0.15 wide ( Fig. 1d ). Suckers 0.05 ± 0.01 (0.04–0.05) in diameter. Mature proglottids 0.51 ± 0.02 (0.50–0.53) long by 1.70 ± 0.01 (1.60–1.80) wide ( Fig. 1e ). Genital pores alternate irregularly. Testes number 45 per proglottid, each testis 0.06 ± 0.005 (0.05–0.06) long by 0.03 ± 0.008 (0.03–0.03) wide. Cirrus sac 0.37 long by 0.14 wide. Vitellarium 0.30 ± 0.02 (0.29–0.32) wide. Ovary 0.60 ± 0.01 (0.59–0.61) wide. Gravid proglottids 1.17 ± 0.01 (1.17–1.18) long by 1.85 ± 0.07 (1.79–1.92) wide. Eggs 45.5 ± 4.12 (41–51) μm long by 42.8 ± 3.86 (39–47) μm wide ( Fig. 1f ). Embryophore in form of a pyriform apparatus.

Taxonomic summary

Host: Holochilus vulpinus

Localities: Estancia San Juan Poriahú, Corrientes Province; Laguna Chascomús, Buenos Aires Province

Voucher specimens: MLP-He 7587, 8033

Comments. The morphological characteristics observed in these specimens allow them to be classified in the genus Monoecocestus i.e., single genitalia; genital pores irregularly alternate; internal and external seminal vesicles present; pyriform apparatus present ( Beveridge 1994). Among species with genital pores irregularly alternate, Monoecocestus sp.1 differs from Monoecocestus andersoni Haverkost & Gardner, 2010 , Monoecocestus machadoi ( Rêgo, 1964) , Monoecocestus mackiewiczi Schmidt & Martin, 1978 , Monoecocestus microcephalus Haverkost & Gardner, 2010 , Monoecocestus minor Rêgo, 1960 , M. myopotami and Monoecocestus sininterus Haverkost & Gardner, 2010 by testes number, and from Monoecocestus eljefe Haverkost & Gardner, 2010 and Monoecocestus diplomys Noble & Tesh, 1974 by size of scolex, suckers and eggs.

Figures

FIGURE 1. Morphological features of Monoecocestus threlkeldi: (a) scolex, (b) mature proglottids, (c) egg; Monoecocestus sp.1: (d) scolex, (e) mature proglottids, (f) egg; Monoecocestus sp.2: (g) scolex, (h) mature proglottids, (i) egg; Monoecocestus sp.3: (j) scolex, (k) mature proglottids, (l) egg.