Hassalstrongylus aduncus (Chandler)

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 : 220

Hassalstrongylus aduncus (Chandler)

(= Longistriata adunca Chandler ; = Longistriata norvegica Dikmans )

Site of infection: Small intestine

Host species: Sigmodon toltecus

Localities: Hobonil ranch, Vallazoo, Kuncheil cattle ranch (Yucatan), Ich ha lol xaan ecological park, Zoh Laguna community (Campeche), and Balam Nah eco-hotel (Quintana Roo)

Specimens deposited: CNHE 12016‒120221

GenBank accession numbers: OR271669, OR271677, OR271679

Comments: The specimens collected in the Yucatan Peninsula presented morphological characteristics in accordance with the original description given by Chandler (1932) for parasites of S. hispidus and the re-description by Durette-Desset (1972) from the same host, i.e., 23 cuticular ridges in the synlophe at midbody ( Figure 4G ); subsymmetrical bursa, with two well-developed lateral lobes and small dorsal lobe, bursal pattern type 1-4 with ray 2 well separated and divergent from the ray 3; dorsal ray with a thick trunk at the base and forking in the shape of an inverted U; and spicules 330–600 long with sigmoid tips.

In Mexico, Ha. aduncus has been reported from S. hispidus in Hidalgo and Jalisco ( García-Prieto et al. 2012) and from S. toltecus and Rat. rattus in Yucatan ( Panti-May et al. 2018). This is the first record of Ha. aduncus in Campeche and Quintana Roo. This finding extends the geographical range of Ha. aduncus in the Yucatan Peninsula.

Figures

FIGURE 4. A. Posterior end of male specimen of Trichuris silviae from Heteromys gaumeri showing the slightly campanulate spicular sheath (arrow), lateral view. B. SEM micrograph of the anterior extremity of Monodontus sp. from Sigmodon toltecus showing the mouth opening, paired cutting plates and cervical papillae (arrow), ventral view. C. Cross section at midbody showing features of the synlophe of female Vexillata vexillata from Heteromys gaumeri. D. Male caudal bursa of Vexillata vexillata from Heteromys gaumeri, ventral view. E. Cross section at midbody showing features of the synlophe of male Heligmosomoidea gen. sp. cf. Vexillata from Ototylomys phyllotis. F. Cross section at midbody showing features of the synlophe of female Carolinensis sp. from Peromyscus yucatanicus. G. Cross section at midbody showing features of the synlophe of male Hassalstrongylus aduncus from Sigmodon toltecus. H. Cross section at midbody showing features of the synlophe of female Hassalstrongylus musculi from Oligoryzomys fulvescens. I. Male caudal bursa of Hassalstrongylus musculi from Ototylomys phyllotis, dorsal view. J. SEM micrograph of female Heligmostrongylus sp. from Peromyscus yucatanicus showing the discontinuous ridges, lateral view. K. Male caudal bursa of Heligmostrongylus sp. from Peromyscus yucatanicus, ventral view. L. Cross section at midbody of female Heligmonellidae gen. sp. from Sigmodon toltecus showing the absence of synlophe. Abbreviations: r, right side; v, ventral side. All cross sections of the synlophe orientated as in figure C.