Palaemon floridanus Chace, 1942

Herrera-Barquín, Hiram, Leija-Tristán, Antonio & Favela-Lara, Susana, 2018, Updated checklist of estuarine caridean shrimps (Decapoda: Caridea) from the southern region of Laguna Madre, Tamaulipas, Mexico, with new records and a key for taxonomic identification, Check List 14 (2), pp. 479-494 : 481

Palaemon floridanus Chace, 1942

Figure 2A, B

Material examined (46 specimens). Among seagrass meadows. 5 August 2014 (UANL-FCB-C17-8143), S2 (24°29.1833ʹ N, 097°41.9667ʹ W), 11 specimens (9♀, 2♂); 5 August 2014 (UANL-FCB-C17-8147), S3 (24°29.2667ʹ N, 097°45.9833ʹ W), same habitat, 35 specimens (16♀, 19♂); 18 February 2017 (UANL-FCB- C17-8161), S3 (same previous point), 1 specimen (♂).

Distribution. Florida, Panama, Belize, Texas, Mexico (Laguna Madre, Tamaulipas [this study, new record]) ( Chace 1972; Holthuis 1952; Coen et al. 1981; Strenth and Chace 1995; Baeza and Fuentes 2012).

Previous records from Laguna Madre: None. New record.

Remarks. This species is closely related with Palaemon northropi (Rankin, 1898) , from which it was differenti- ated by Chace (1942) by the shape and dentition of the rostrum, the second legs, which have distinctly longer fingers, and the more slender and longer dactyli of the third pereopods ( Holthuis 1952). Nevertheless, the most consistent identification character is the shape of the rostrum, which is slender and possesses more teeth on the ventral margin than in P. northropi ( Holthuis 1952) ( Fig. 2A). Our specimens typically showed 5 teeth on the ventral margin of rostrum.