Thalassina Latreille 1806
Creators: name: Lin, Feng-Jiau
name: Komai, Tomoyuki
name: Chan, Tin-Yam
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Thalassinidae
Thalassina

description: Key to the extant species of Thalassina   
1. Rostrum with blunt tip; posterodorsal median process of carapace long or short; sternites of pleomeres 2–5 each with median or lateral tubercles........................................................................2  
– Rostrum with acute or subacute tip; posterodorsal median process of carapace short; sternites of pleomeres 2–5 only with lateral tubercles on either side of midline..............................5  
2. Lateral margin of rostrum and dorsolateral carina of pereopod 1 palm with conspicuous tubercles.........................................3  
 – Lateral margin of rostrum and dorsolateral carina of pereopod 1 palm without conspicuous tubercles or at most with obsolescent tubercles [posterodorsal median process of carapace long; tergites of pleomeres 2–5 each with median tubercles]............................................................................................. T. krempfi   
3. Posterodorsal median process of carapace long; dorsolateral carina of pereopod 1 palm extending over entire length.......4  
– Posterodorsal median process of carapace small; dorsolateral carina of pereopod 1 palm extending to half or proximal threefourths length...........................................................................6  
 4. Cervical groove of carapace unarmed or bordered with a few tubercles; merus of pereopod 3 with minute spines on dorsal margin in limited extent......................................... T. anomala   
– Cervical groove of carapace bordered with spines at least laterally; merus of pereopod 3 with row of conspicuous spines on dorsal margin over entire length.......................................5  
 5. Postcervical carapace covered with numerous spines; cervical groove bordered by row of spines entirely............. T. spinosa   
 – Postcervical carapace only armed with a few spines adjacent to linea thalassinica; cervical groove bordered by spines only laterally................................................. T. pratas, new species   
 6. Postrostral median groove extending beyond posterior ends of rostral lateral carinae; male gonopod 1 generally slender with 3 or 4 conspicuous teeth on lateral margin proximally........................................................................................... T. kelanang   
 – Postrostral median groove not reaching posterior ends of rostral lateral carinae; male gonopod 1 generally broad, unarmed on lateral margin..................................................... T. squiamifera   
7. Lateral margins of rostrum with tubercles only.....................8  
 – Lateral margins of rostrum and anterolateral margins of carapace with tubercles and spines [pereopod 1 merus with large spines on ventral margin proximally, palm with dorsolateral carina extending almost over entire length, lateral ventral carina with spiniform tubercles and spines; sternites of pleomeres 2–5 with lateral tubercles only in males, no lateral tubercles in females].......................................................... T. spinirostris   
 8. Pereopod 1 merus with large spines on ventral margin proximally, palm with dorsolateral carina extending nearly over entire length; sternites of pleomeres 2–5 with faint lateral tubercles in males, no lateral tubercles in females.................................................................................................... T. gracilis   
– Pereopod 1 merus without large spines on ventral margin proximally, palm with dorsolateral carina extending to about midlength; sternites of pleomeres 2–5 with lateral tubercles and often numerous anterior tubercles...................................9  
 9. Pereopod 1 palm with covering of granules on space between dorsolateral and dorsomesial carinae, latter carina with 14–16 spiniform tubercles.............................................. T. saetichelis   
 – Pereopod 1 palm without covering of granules on space between dorsolateral and dorsomesial carinae, latter carina with 18–23 blunt tubercles.................................................. T. australiensis
description: Published as part of Lin, Feng-Jiau, Komai, Tomoyuki & Chan, Tin-Yam, 2016, A new mud lobster of the genus Thalassina Latreille, 1806 (Crustacea: Decapoda: Gebiidea: Thalassinidae) from marine seagrass beds in Dongsha (Pratas) Island, South China Sea, pp. 98-104 in Raffles Bulletin of Zoology 64 on pages 103-104, DOI: 10.5281/zenodo.4504421