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Type: Article
Published: 2019-04-16
Page range: 187–193
Abstract views: 73
PDF downloaded: 1

A new genus and species of a terrestrial cavernicolan planarian from Barro Colorado Island, Panama (Platyhelminthes, Tricladida, Cavernicola)

Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA Leiden, The Netherlands
EMBL-European Bioinformatics Institute, Wellcome Genome Campus, EMBL-EBI South Building, Hinxton CB10 1SD, United Kingdom
Platyhelminthes flatworm new genus new species Kawakatsua Sluys gen. nov. molecular phylogeny taxonomy


The paper provides a taxonomic description of a new genus and species of terrestrial cavernicolan triclad flatworm from Barro Colorado Island, Panama. Molecular sequences of this species were already deposited in GenBank several years ago under the provisional taxon name Cavernicola sp. Animals have the following characteristics: absence of pigmentation and eyes; mouth opening located halfway in the pharyngeal cavity; few, ventral testes extending from a position far posterior to the ovaries to directly behind the pharyngeal cavity; strongly recurving sperm ducts, thus forming a loop; horizontally oriented cone-shaped penis papilla; common oviduct oriented perpendicular to the bursal canal and opening into the latter shortly before the canal communicates with the copulatory bursa; sac-shaped copulatory bursa lacking a distinct, single lumen and filled with a mass of syncytial cells, with interspersed nuclei.



  1. Harrath, A.H., Mansour, L., Lagnika, M., Sluys, R., Boutin, C., Alwasel, S., Poch, A. & Riutort, M. (2016) A molecular analysis of the phylogenetic position of the suborder Cavernicola within the Tricladida (Platyhelminthes), with the description of a new species of stygobiont flatworm from Benin. Zoological Journal of the Linnean Society, 178, 482–491.

    Hyman, L.H. (1941) Terrestrial Flatworms from the Canal Zone, Panama. American Museum Novitates, 1105, 1–11.

    Laumer, C.E. & Giribet, G. (2014) Inclusive taxon sampling suggests a single, stepwise origin of ectolecithality in Platyhelminthes. Biological Journal of the Linnean Society, 111 (3), 570–588.

    Leal-Zanchet, A.M., de Souza, S.T. & Ferreira, R.L. (2014). A new genus and species for the first recorded cave-dwelling Cavernicola (Platyhelminthes) from South America. ZooKeys, 442, 1–15.

    Pressnell, J.K. & Schreibman, M.P. (1997). Humason's Animal Tissue Techniques, 5th Edition. Johns Hopkins University Press, XIX + 572 pp.

    Sluys, R. (1989) A monograph of the marine triclads. A. A. Balkema, Rotterdam & Brookfield, XII + 463 pp.

    Sluys, R. (1990) A monograph of the Dimarcusidae (Platyhelminthes, Seriata, Tricladida). Zoologica Scripta, 19, 13–29.