Records of Polycladus gayi (Tricladida, Geoplanidae) preying on the invasive slug Limax maximus (Gastropoda, Limacidae) in Chile's temperate forests

By

Barahona-Segovia, Rodrigo M.
Quintanilla Iturra, Eduardo
Meneses Rubio, Camila
Silva-Reyes, Pablo
Hormazábal, Leonardo

Type

Article

Date of Publication

2025-8-29

Original Publication

Neotropical Biology and Conservation

Volume

20

Series / Issue

Issue: 3

Pages

247--254

Subjects

Land planarian , native forest , Platyhelminthes , predatory behaviour

Contributed by

Pensoft Publishers

Language

English

Published by

Brazil Universidade do Vale do Rio dos Sinos

Identifiers

DOI: https://doi.org/10.3897/neotropical.20.e159659

 

Abstract

Terrestrial planarians are important soil predators of a variety of invertebrate groups, including exotic and invasive mollusc species. However, data on prey in natural conditions are scarce. Polycladus gayi is a giant planarian from the forests of southern Chile whose predatory behaviour is poorly known. Here, we report two cases of predation on Limax maximus, an invasive slug recorded within native forests. We suggest that P. gayi displayed two distinct types of predatory behaviour: (1) helicoidal tube formation and (2) surrounding immobilisation. As the reported distributions of the invasive slug and P. gayi are similar, we suggest this predator-prey interaction might be common. Furthermore, depending on the prey type and size, P. gayi might exhibit different types of predatory behaviour. This knowledge reveals little-known aspects of P. gayi ecology, raising new questions about ecological and conservation issues.