Syphacia sp.

Panti-May, Jesús Alonso, Moguel-Chin, Wilson Isaias, Hernández-Mena, David Iván, Cárdenas-Vargas, Miguel Humberto, Torres-Castro, Marco, García-Prieto, Luis, Digiani, Maria Celina, Hernández-Betancourt, Silvia F. & Vidal-Martínez, Víctor Manuel, 2023, Helminths of small rodents (Heteromyidae and Cricetidae) in the Yucatan Peninsula, Mexico: an integrative taxonomic approach to their inventory, Zootaxa 5357 (2), pp. 205-240 : 224-225

Syphacia sp. (4)

Site of infection: Caecum and large intestine

Host species: Ototylomys phyllotis

Localities: Ich ha lol xaan ecological park (Campeche) and Balam Nah eco-hotel (Quintana Roo)

Specimens deposited: CNHE 12034‒12035

GenBank accession number: OR271673

Comments: Only non-gravid females were found. Collected specimens had a cuticle with fine transverse striations, fields between transverse striations with shallow longitudinal depressions ( Figure 5N ); a cephalic plate laterally elongated ( Figure 5O ); deirids present ( Figure 5P ); cervical alae absent; lateral alae absent but different cuticular morphology occurs at the place where the former would be, and vulva slightly prominent. Although all these features are shared only with Syphacia sp. (1), genetic differences and phylogeny of the 28S gene (see results below) show that Syphacia sp. (1) from H. gaumeri and Syphacia sp. (4) from O. phyllotis are sufficiently distant to be considered two species. This suggests that specimens likely represent another new, undescribed Syphacia species, however, as mentioned above, new material, mainly males, should be collected to describe this species.

This finding extends the geographical range of the genus Syphacia to Campeche.

Figures

FIGURE 5. A. SEM micrograph of cephalic plate of female Syphacia peromysci from Peromyscus yucatanicus, apical view. B. SEM micrograph of anterior extremity of female Syphacia peromysci from Peromyscus yucatanicus showing the cervical alae (arrow), ventral view. C. SEM micrograph of complete male of Syphacia peromysci from Peromyscus yucatanicus showing the mamelons (arrows), lateral view. D. Caudal extremity of male Syphacia peromysci from Peromyscus yucatancus showing the caudal papillae (arrows), lateral view. E. Egg of Syphacia peromysci from Peromyscus yucatanicus, lateral view. F. Cephalic plate of female Syphacia sp. (1) from Heteromys gaumeri, apical view. G. Egg of Syphacia sp. (1) from Heteromys gaumeri, lateral view. Cephalic plate of female Syphacia sp. (2) from Reithrodontomys gracilis showing the cervical alae (arrow), apical view. I. Egg of Syphacia sp. (2) from Reithrodontomys gracilis, lateral view. J. SEM micrograph of cephalic plate of female Syphacia sp. (3) from Ototylomys phyllotis, apical view. K. Anterior extremity of female Syphacia sp. (3) from Ototylomys phyllotis showing the isthmus (arrow), ventral view. L. SEM micrograph of anterior extremity of Syphacia sp. (3) from Ototylomys phyllotis showing the lateral folds (arrow), lateral view. M. Egg of Syphacia sp. (3) from Ototylomys phyllotis, lateral view. N. SEM micrograph of the anterior section of female Syphacia sp. (4) from Ototylomys phyllotis showing the cuticle with transverse striations and shallow longitudinal depressions, lateral view. O. SEM micrograph of cephalic plate of female Syphacia sp. (4) from Ototylomys phyllotis, apical view. P. Anterior extremity of female Syphacia sp. (4) from Ototylomys phyllotis showing the deirids (arrow), ventral view.