| Family | Scientific Name | Author | Year | Common Name |
| Atherinopsidae | Membras martinica | (Valenciennes) | 1835 | Rough Silverside |
Membras martinica
Unique Characters: Posterior margins of scales with scalloped edges, rough to the touch. Dorsum peppered with melanophores. Rostral sensory system present with four large depressions at anterior margin of frontal bones. Lateral axillary scale of pelvic fin well developed, greater than or equal to 1/3, usually greater than or equal to 1/2 length of fin. Origin of spinous dorsal fin anterior or posterior to anal-fin origin.
Similar Species:
Atlantic Silverside
Menidia menidia
Inland Silverside
Menidia beryllina
Atlantic Silverside Menidia menidia. Spinous dorsal fin always anterior to origin of anal fin. Origin of spinous dorsal fin posterior to vertical through anus. Segmented anal-fin soft rays 20-27, rarely 19. Lateral scales 39-47, rarely 38. Anal fin weakly concave. Rostral sensory system absent, lacking pits, pores, or tubes. Lateral axillary scale of pelvic fin absent or poorly developed, less than or equal to 1/4 length of fin.
Inland Silverside Menidia beryllina. Spinous dorsal fin always anterior to origin of anal fin. Origin of spinous dorsal fin anterior to vertical through anus. Segmented anal-fin soft rays 8-19, rarely 20. Lateral scales 28-41, rarely 42 or 43. Anal fin margin strongly concave. Rostral sensory system absent, lacking pits, pores, or tubes. Lateral axillary scale of pelvic fin absent or poorly developed, less than or equal to 1/4 length of fin.
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