Enchiridium periommatum Bock 1913

Enchiridium periommatum Bock, 1913 Fig. 5 B Material examined. Yucatan coast, Mexico • 1; Arrecife Alacranes; 22.4°N, 89.7°W; 1 m; 3 Nov. 2017; A. Hernández leg.; CRPPY -0001 • 1; Arrecife Alacranes; 22.4°N, 89.7°W; 1 m; 3 Nov. 2017; A. Hernández leg.; CRPPY -0003 • 2; Arrecife Alacranes; 22.4°N, 89.7°W; 1 m; 4 Nov. 2017; A. Hernández leg.; CRPPY -0005 • 1; Arrecife Alacranes; 22.4°N, 89.7°W; 2 m; 4 Nov. 2017; A. Hernández leg.; CRPPY -0007; Quintana Roo coast, Mexico • 1; Mahahual; 18.6°N, 87.7°W; 15 m; 18 Mar. 2018; A. Hernández leg.; CRPPY -0042; Yucatan coast, Mexico • 1; Dzilam; 21.5°N, 88.9°W; 13 m; 10 May 2018; A. Hernández leg.; CRPPY -0098. Distribution. The species was originally described in Thatch Island, US Virgin Islands (Bock 1913), later collected in Jamaica (Hyman 1955), and also known from Texas to Florida, Gulf of Mexico (Hyman 1955). This is a new record for the coasts of Campeche and Quintana Roo (Mexico). Description. Body elongated, 1.5 cm in length and 0.5 cm in width, with a rounded anterior end and a tapered posterior end. Marginal eyes densely distributed along the anterior margin; cerebral eyes in a heart-shaped cluster. Translucent white background speckled with dense brown to orange spots that gradually decrease in number towards the edges (Fig. 5 B). Pharynx, male and female reproductive organs, as well as the sucker are located in the anterior 1 / 2 of the body, a distinctive feature of this species.