Table 1.
Ultrastructural characteristics of the mature spermatozoon in the Gorgoderoidea and Microphalloidea.
| Taxa | MaxCM | ASE | LE | SB | CM + EO | TEO | M | TPSE | PSC |
|---|---|---|---|---|---|---|---|---|---|
| Gorgoderoidea | |||||||||
| Dicrocoeliidae | |||||||||
| Dicrocoelium dendriticum [12] | 44 | 1Ax | − | − | − | ? | 1 | 3 | 1Ax |
| Dicrocoelium hospes [1] | 36 | 1Ax | + | + | + | 2 | 2* | 2 | N |
| Corrigia vitta [53] | 33 | 1Ax | − | − | − | ? | 1 | 3 | 1Ax |
| Paragonimidae | |||||||||
| Paragonimus ohirai [41] | 33 | ? | − | + | + | 2 | 2 | ? | 1Ax |
| Troglotrematidae | |||||||||
| Troglotrema acutum [30] | 34 | 1Ax | + | + | + | 2 | 2 | 3 | 1Ax |
| Microphalloidea | |||||||||
| Collyriclidae | |||||||||
| Collyricloides massanae (Present study) | 42 | 2Ax | − | + | + | 2 | 1 | 3 | 1Ax |
| Faustulidae | |||||||||
| Pronoprymna ventricosa [49] | 8 | 1Ax | − | − | − | 1 | 1 | 3 | 1Ax |
| Pleurogenidae | |||||||||
| Brandesia turgida [10] | 41 | 2Ax | − | − | + | 2 | 1 | 3 | 1Ax |
| Pleurogenes claviger [32] | 43 | 2Ax | − | + | + | 2 | 2* | 3 | 1Ax |
| Pleurogenoides medians [32] | 44 | 2Ax | − | + | + | 2 | 2* | 3 | 1Ax |
| Prosotocus confusus [32] | 39 | 2Ax | − | + | + | 2 | 2* | 3 | 1Ax |
| Phaneropsolidae | |||||||||
| Postorchigenes gymnesicus [14] | 36 | ? | − | − | + | 2 | 2 | 3 | 1Ax |
| Prosthogonimidae | |||||||||
| Mediogonimus jourdanei [5] | 40 | 2Ax | − | + | + | 2 | 1 | 3 | 1Ax |
| Zoogonidae | |||||||||
| Diphterostomum brusinae [29] | 39 | 1Ax | − | − | + | 1 | 1 | 2 | N |
ASE, anterior spermatozoon extremity; Ax, axoneme; CM + EO, association “cortical microtubules + external ornamentation”; LE, lateral expansion; M, number of mitochondria; MaxCM, maximum number of cortical microtubules; N, nucleus; PSC, posterior spermatozoon character; TEO, type of external ornamentation location according to Quilichini et al. [48]; TPSE, type of posterior spermatozoon extremity according to Quilichini et al. [46]; SB, spine-like bodies; +/−, presence/absence of considered character; ?, unknown character.
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