Girardia tigrina (Girard, 1850)

Ji, Su-Jung, Jung, Jongwoo, Kim, Sa Heung, Ahn, Dong-Ha, Kim, Min-Seop, Lee, Jeounghee, Yang, Hee-Min, Lee, Geon Hyuk, Nam, Eunjung, Park, Taeseo, Jöst, Anna B., Pham, Huyen T. M., Park, Jina, Park, Joohee, Keum, Seoyoung, Karanovic, Ivana, Karanovic, Tomislav, Park, Joong-Ki, Jung, Chuleui & Min, Gi-Sik, 2023, Unrecorded species of Korean invertebrates discovered through the project of ‘ Discovery of Korean Indigenous Species’ III, Journal of Species Research 12 (4), pp. 341-354 : 343

2. Girardia tigrina (Girard, 1850) ( Fig. 2 )

Ḁäū4나ƞď (ṳḡ)

Material examined. Suncheon-si (34°56′37.52″N, 127° 29′54.36″E), Korea; collected by DH Ahn on 15 August 2021; freshwater .

Deposition. NIBRIV0000901588.

GenBank accession No. OR178933 for CO1.

World distribution. Endemic to the Americas (from Argentina to Canada), having been introduced in other continents (Europe, Australia, and Asia) and islands. Korea (this study).

Diagnosis. Size about 4 - 6 mm (length) × 2 mm (width); Head triangular, with bluntly pointed anterior tip. Two eyes present at the middle of the head at the level of au- ricles, positioned close together and located in broad pigment-free patches. Unpigmented auricular grooves marginally placed just posteriorly to the eyes. The dorsal surface with black-spotted pigmentation pattern.

Remarks. Girardia tigrina is anatomically very similar to G. dorotocephala . In both species, the shape of the penis papilla is rather variable and the same holds true for the course and the shape of the intrapenial sections of the sperm ducts. Usually, specimens of G. tigrina have a distinctly angled bursal canal, whereas in G. dorotocephala the canal generally curves smoothly anteriad.

Figures

Fig. 2. Girardia tigrina (Girard, 1850). A. Some individuals of G. tigrina(preserved); B. dorsal view (preserved). Scale bars=5 mm.