Ophioderma teres (Lyman 1860)

Disk pentagonal (dd = 5.3 to 12.2 mm). Dorsal and ventral sides of the disk covered by fine and rounded granulation. Radial shields naked and oval (Fig. 6J, K). Oral shields heart-shaped, small and with three rounded lobes. Adoral shields covered by granulation. Madreporite evident. Eight to nine oral papillae on each side of the jaw (Fig. 6L). Dorsal arm plates wider than long and divided in several irregular pieces (two to four) (Fig. 6H). Ventral arm plates quadrangular and rounded. Reduced lateral arm plates. Six to seven short arm spines, all spines are closely equal in size, except the lowest which is longer. Two tentacle scales (Fig. 6I). Four bursal slits per interradius (Fig. 6K). Dorsal side uniformly chocolate-brown in color, with irregular black rings on the disk (Fig. 6G, J). Ventral side yellowish-cream in color (Fig. 6K).

Mexico, El Salvador, Nicaragua, Costa Rica, Panama, Ecuador, Colombia and Galapagos Islands (Ziesenhenne 1955, Neira and Cantera 2005, Alvarado et al. 2010). In Mexico, from the Gulf of California (Baja California Sur, Sonora, Sinaloa), in the Pacific side of Baja California and Baja California Sur, Nayarit, Jalisco, Guerrero and Oaxaca (Solís-Marín et al. 2005, Honey-Escandón et al. 2008). From intertidal to 46 m depth (Maluf 1988). In this study, Ophioderma teres was collected on coral reefs from Guerrero and Oaxaca; 9.1 to 10.7 m depth.