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

Syphacia sp. (2)

Site of infection: Caecum and large intestine

Host species: Reithrodontomys gracilis

Localities: Kuncheil cattle ranch (Yucatan)

Specimens deposited: CNHE 12029‒30

Comments: The specimens found in R. gracilis had a cuticle with fine transverse striations, fields between transverse striations with shallow longitudinal depressions; a cephalic plate laterally-elongated in females; deirids present in females; cervical alae poorly developed ( Figure 5H ); lateral alae absent; male spicule 60 long; female tail 315‒550 long; females with not prominent vulva; and eggs 85‒108 long by 25‒ 35 wide ( Figure 5I ). Among the eight species of Syphacia with cervical alae ( Sy. carlitosi , Sy. alata , Sy. obvelata , Sy. peromysci , Sy. samorodini, Sy. p. rauschi, Sy. sigmodoni , and Sy. hodarae ), our specimens can be differentiated from Sy. carlitosi , Sy. alata , Sy. obvelata , Sy. samorodini , and Sy. hodarae by having deirids. In addition, the species from R. gracilis has a longer spicule than that of Sy. peromysci (57‒70), Sy. p. rauschi (56) and Sy. sigmodoni (64). Based on these findings, we consider that our specimens likely represent a new, undescribed Syphacia species.

This is the first helminthological record for R. gracilis .

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.