Summary description from Wikipedia:

Prosthiostomidae in languages:

Japanese

ホソヒラムシ科

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©劉佳勳, some rights reserved (CC-BY-NC)

©劉佳勳, some rights reserved (CC-BY-NC)

©Damien Brouste, some rights reserved (CC-BY-NC)

©Damien Brouste, some rights reserved (CC-BY-NC)

©Damien Brouste, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

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©adurbano, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

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©Johan Bas, some rights reserved (CC-BY-NC)

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©Karolle Wall, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

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©Olivia Bañez, some rights reserved (CC-BY-NC)

©Olivia Bañez, some rights reserved (CC-BY-NC)

©Alex Bairstow, some rights reserved (CC-BY-NC)

©smithsonian_marinegeo, some rights reserved (CC-BY-NC-SA)

©smithsonian_marinegeo, some rights reserved (CC-BY-NC-SA)

©Johan Bas, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

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©Johan Bas, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Karolle Wall, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©Nick Shaw, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

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©Johan Bas, some rights reserved (CC-BY-NC)

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©Johan Bas, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

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©Karolle Wall, some rights reserved (CC-BY-NC)

©Johan Bas, some rights reserved (CC-BY-NC)

©smithsonian_marinegeo, some rights reserved (CC-BY-NC-SA)

©Johan Bas, some rights reserved (CC-BY-NC)

Parent Taxon

• Polycladida

Sibling Taxa

• Amyellidae
• Anonymidae
• Boniniidae
• Cestoplanidae
• Chromoplanidae
• Dicteroidae
• Diposthidae
• Ditremageniidae
• Euryleptidae
• Euryleptididae
• Laidlawiidae
• Opisthogeniidae
• Prosthiostomidae
• Pseudocerotidae
• Theamatidae

Child Taxa

• Enchiridium
• Enterogonimus
• Euprosthiostomum
• Lurymare
• Prosthiostomum

Top Observation Places

• Nouméa