Rhynchodemus sylvaticus (Leidy, 1851) Figs. 24–26. External diagnosis (Ball & Reynoldson 1981; Ball & Sluys 1990). Anterior region flattened and narrowed into a proboscis-like appearance. Usually pale or brownish gray. Along the dorsal surface there are two dark longitudinal stripes which are often united with a dark saddle in the pharyngeal region; rarely, mostly in dark specimens, the stripes are inconspicuous. The ventral surface is pale. There are two large eyes situated distantly from the anterior tip. Very small, up to 15 mm, but usually smaller. The absence of a head plate differentiates it from both species of Bipalium and the paired eyes differ from all recorded Caenoplanini as well as Geoplana multipunctata. This species has a narrow anterior region, unlike Diporodemus yucatani which has a rounded one. Rhynchodemus sylvaticus is much smaller than both Dolichoplana and only has two dorsal stripes. Remarks. This species is found in the Holarctic region (Ball & Reynoldson 1981; Ball & Sluys 1990) and is considered European (Álvarez-Presas et al. 2014) iNaturalist Records. MEXICO: JALISCO: One specimen observed 16 October 2019; 20.5487, -104.0392; uploaded by chriss666 (#34503888).

Published as part of Luna, Manuel De & Boll, Piter Kehoma, 2023, An annotated checklist of terrestrial flatworms (Platyhelminthes: Tricladida: Geoplanidae) from Mexico, with new records of invasive species from a citizen science platform and a new nomen dubium, pp. 518-532 in Zootaxa 5297 (4) on pages 528-529, DOI: 10.11646/zootaxa.5297.4.3, http://zenodo.org/record/8009087