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Table 1.

Ultrastructural characteristics of mature vitellocytes of Crepidostomum metoecus compared with those of other studied trematodes.

Families Species Cell size L L size G CER SG/SGC SGC SGC size References
Allocreadiidae Crepidostomum metoecus 19 10 1.4 + 32 30 1.8 Present study
Azygiidae Azygia lucii 15 5 1.5 + 50 19 2.7 [37]
Cryptogonimidae Aphallus tubarium 7 1 2 + + 35 3 2 [13]
Metadena depressa 8 2 1 + 45 4 3 [14]
Derogenidae Halipegus eccentricus 10 0 0 60 12 2 [22]
Dicrocoeliidae Dicrocoelium dendriticum 18 1 1.5 + + 42 12 3 [30]
Diplostomidae Pharyngostomoides procyonis / 1 1 / + 13 14 1.3 [30]
Fasciolidae Fasciola hepatica 20 0 0 + + 25 6 2 [24]
Gorgoderidae Gorgoderina vitelliloba 7 1 1.5 95 5 2 [23]
Phyllodistomum angulatum 10 3 2.5 + 100 11 2.7 [37]
Haploporidae Haploporus lateralis / 1 / + / / / [42]
Microphallidae Maritrema feliui 16 1 1 + 73 5 2 [46]
Maritrema linguilla 10 4 1 + / / 11 3 [21]
Plagiorchiidae Plagiorchis elegans 20 13 2 + + 30 20 2 [15]
Brandesia turgida 13 1 1 + 25 / 2.5 [38]
Schistosomatidae Schistosoma mansoni 13 14 1 + + 27 14 2 [7, 8]

CER: coiled endoplasmic reticulum; G: glycogen; L: lipid droplets; SG/SGC: number of globules per cluster; SGC: shell globule clusters; (+/−): presence/absence of considered character; (/): no data on the considered character. Families are given in alphabetical order. Sizes are in μm. Data are averages of measurements on 10 cells.

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