Crustaceana 85 (11) 1339-1376 A REVIEW OF THE SPECIES OF THE GENUS THALASSINA (THALASSINIDEA, THALASSINIDAE) BY KATSUSHI SAKAI1,3) and MICHAEL TÜRKAY2,4) 1) Shikoku University, Tokushima, Japan 2) Senckenberg Forschungsinstitut, Senckenberganlage 25, DE-60325 Frankfurt am Main, Germany ABSTRACT The genus Thalassina Latreille, 1806, recently dealt with by Ngoc-Ho & De Saint Laurent (2009) was reviewed including one additional species described by Moh & Chong (2009), and has turned out to be currently composed of nine species including two new species: Thalassina anomala (Herbst, 1804); Thalassina australiensis sp. nov.; Thalassina gracilis Dana, 1852 [sensu Ngoc-Ho & De Saint Laurent, 2009]; Thalassina kelanang Moh & Chong, 2009; Thalassina krempfi Ngoc-Ho & De Saint Laurent, 2009; Thalassina saetichelis sp. nov.; Thalassina spinirostris Ngoc-Ho & De Saint Laurent, 2009; Thalassina spinosa Ngoc-Ho & De Saint Laurent, 2009; and Thalassina squamifera De Man, 1915, which are distributed in the subtropical and tropical regions of the Indo-West Pacific Ocean system. ZUSAMMENFASSUNG Die Gattung Thalassina Latreille, 1806, wurde zuletzt von Ngoc-Ho & De Saint Laurent (2009), behandelt. Die gegenwärtige Revision erfolgt unter Einschluss einer weiteren Art die von Moh & Chong (2009) beschrieben wurde. Es hat sich herausgestellt daß die Gattung neun Arten einschließlich zwei neuer Arten umfasst: Thalassina anomala (Herbst, 1804); Thalassina australiensis sp. nov.; Thalassina gracilis Dana, 1852 [sensu Ngoc-Ho & De Saint Laurent, 2009]; Thalassina kelanang Moh & Chong, 2009; Thalassina krempfi Ngoc-Ho & De Saint Laurent, 2009; Thalassina saetichelis sp. nov.; Thalassina spinirostris Ngoc-Ho & De Saint Laurent, 2009; Thalassina spinosa Ngoc-Ho & De Saint Laurent, 2009; und Thalassina squamifera De Man, 1915, die weit in den Tropen und Subtropen des Indo-West Pazifischen Ozeans verbreitet sind. INTRODUCTION Ngoc-Ho & De Saint Laurent (2009) published an account presenting new data on seven species of the genus Thalassina Latreille, 1806, i.e., Thalassina anomala 3) e-mail: [email protected] 4) e-mail: [email protected] © Koninklijke Brill NV, Leiden, 2012 DOI:10.1163/15685403-00003114 1340 KATSUSHI SAKAI & MICHAEL TÜRKAY (Herbst, 1804); Thalassina gracilis Dana, 1852; Thalassina emerii Bell, 1844; Thalassina krempfi Ngoc-Ho & Saint Laurent, 2009; Thalassina spinirostris Ngoc- Ho & de Saint Laurent, 2009; Thalassina spinosa Ngoc-Ho & De Saint Laurent, 2009; and Thalassina squamifera De Man, 1915. In the same year, an additional species, Thalassina kelanang Moh & Chong, 2009, was reported from Malaysia (Moh & Chong, 2009). These species have been reviewed, and it has turned out that the genus Thalassina is composed of nine species, including two new species, and a new classification is proposed with a key for the identification of the species. MATERIAL AND METHODS In this study we have reviewed the original material of Ngoc-Ho & De Saint Laurent (2009) and compared it with additional material, as stated in the sections “Material examined”, of the various species treated under “Systematics”. Abbreviations used in the text. — NHM (= NHML), Natural History Museum, London; MNHN, Muséum National d’Histoire Naturelle, Paris; RMNH, Nether- lands Centre for Biodiversity Naturalis, Leiden; SMF, Forschungsinstitut und Naturmuseum Senckenberg, Frankfurt am Main; ZMB, Museum für Naturkunde an der Humboldt-Universität zu Berlin; ZRC, Zoological Reference Collection, Singapore. D, Dana, 1852; N & S, Ngoc-Ho & De Saint Laurent (2009); S & T, K. Sakai & M. Türkay (present paper); TL, total length; CL, carapace length. RESULTS AND DISCUSSION The present authors have reviewed the descriptions of Ngoc-Ho & De Saint Laurent (2009), and found that (1) Thalassina emerii Bell, 1844 is to be defined as a nomen dubium, and the material identified by them as Thalassina emerii Bell, 1844 has turned out to consist of two kinds of specimens, both of which are to be described as new species, viz., Thalassina australiensis sp. nov. and T. saetichelis sp. nov.; (2) Thalassina gracilis Dana, 1852 was redescribed by Ngoc-Ho & De Saint Laurent (2009: 140), and they designated a young male chosen from among recent specimens from Singapore as its neotype. However, the male specimen should not have been designated as the neotype of T. gracilis Dana, 1852, because of its differences with Dana’s concept of T. gracilis, so that in the present paper it is referred to as T. gracilis Dana, 1852 [sensu Ngoc-Ho & De Saint Laurent, 2009]. Accordingly, the nominal species Thalassina squamifera De Man, 1915, is now considered to be a synonym of T. gracilis Dana, 1852, and has now become a valid name, to be used for the specimens that are in accordance with the original description of Dana (1852)..