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From:

Lisandro Negrete, Francisco Brusa, 2016. First report of the genus Cratera (Platyhelminthes, Geoplanidae) in Argentina, with description of a new species and comments on the species of the genus. ZooKeys 610: 1-12.

Description:

Figure 4.

Schematic reconstruction, in sagittal view, of the copulatory apparatus of Cratera viridimaculata sp. n. (holotype). Abbreviations: cm, common muscle coat; co, common ovovitelline duct; ej, ejaculatory duct; fa, female atrium; fc, female genital canal; go, gonopore; ma, male atrium; od, ovovitelline duct; pp, penis papilla; pv, prostatic vesicle; sd, sperm duct; sg, shell glands. Scale bar: 500 µm.