Platynosomum illiciens (Braun), 1916

Panti-May, Jesús Alonso, Chan-Casanova, Anyela Jackelin, Canche-Pool, Elsy, Tello-Martín, Raúl, Ruiz-Piña, Hugo, Concha-Guillermo, Henry, Guiascón, Oscar Retana-, Vega, Pedro Pablo Martínez, Chablé-Santos, Juan, Martínez, Erendira Estrella-, Moguel-Chin, Wilson Isaias, Hernández-Orts, Jesús S., Hernández-Mena, David I., Mendoza-Garfias, Berenit & García-Prieto, Luis, 2024, Morphological and molecular data on helminths of Didelphis virginiana and Philander vossi (Mammalia: Didelphidae) from the Yucatán Peninsula, southeast Mexico, Zootaxa 5463 (1), pp. 1-24 : 4-5

Platynosomum illiciens (Braun)

Site of infection: Liver.

Host species: Didelphis virginiana .

Locality: Mérida (Yucatán).

Prevalence: 16.7% (1/6).

Intensity: 1.

Specimen deposited: CNHE 12897.

Comments: Only one specimen was found, which conform to the morphological characteristics of P. illiciens reported by Nguyen et al. (2017) and Pinto et al. (2017). Body elongate (4,150 long by 1,240 in maximum width) ( Figure 1C ). Suckers subequal, situated in the anterior part of body; oral sucker 350 long by 330 wide, ventral sucker 340 long by 360 wide. Testes posterolateral to the ventral sucker; both testes anterior to midbody, left testis 320 long by 300 wide, right testis 440 long by 250 wide. Elongated cirrus sac, small (425 long by 110 wide), extending slightly posterior to margin of ventral sucker. Genital pore median, at level of the caecal bifurcation. Ovary dextral, small (190 long by 320 wide), immediately posterior to the right testis. Vitellaria in two lateral field, extending from the ovary to 3/4 of the body length. Eggs 32–33 long by 20–23 wide.

Platynosomum illiciens is a trematode with a worldwide distribution reported in several birds and mammals as definitive hosts ( Pinto et al. 2022), including D. virginiana ( Eckerlin & Leigh 1962) . Molecular studies have confirmed its wide geographic distribution and low host specificity.Previously described species in cats, primates, and birds, such as Platyonosomum fastosum Kossack, Platynosomum concinnum (Braun) , Platynosomum amazonensis Kingston & Cosgrove , and Platynosomum marmoseti Kingston & Cosgrove , are now considered synonyms of P. illiciens ( Pinto et al. 2022) . This is the first record of P. illiciens from D. virginiana in Mexico.

Figures

FIGURE 1. Brachylaima sp. and Platynosomum illiciens from Didelphis virginiana. A. Adult specimen of Brachylaima sp., ventral view. B. SEM micrograph of Brachylaima sp. anterior end, ventral view. C. Adult specimen of Platynosomum illiciens ventral view. Abbreviations: oral sucker (os), ventral sucker (vs), testis (t), vitellaria (v), ovary (o), genital pore (gp).