Phaenocelis medvedica Marcus, 1952

Fig. 17

Material examined.

Campeche coast, Mexico • 1; Cayo Arcas; 20.2°N, 92.0°W; 6.2 m; 20 Aug. 2018; A. Hernández leg.; CRPPY -0109 • 1; Cayo Arcas; 20.2°N, 92.0°W; 3.3 m; 20 Aug. 2018; A. Hernández leg.; CRPPY -0112 .

Distribution.

Phaenocelis medvedica was recorded in Brazil (Marcus 1952; Bahia et al. 2015; Bahia and Schrödl 2018); Caribbean coast of Colombia (Quiroga et al. 2004 a, 2004 b). New record for the Campeche coast and Gulf of Mexico.

Description.

Body shape elongated with rounded anterior end and pointed posterior end, 0.45 cm in length and 0.2 cm in width. Translucent pinkish colouration, including two longitudinal dark brown rows parallel to the main body’s axis (Fig. 17 A). Two elongated clusters of cerebral eyes and two small groups of tentacular eyes sparsely distributed. Small marginal eyes along the entire body margin. (Fig. 17 B). Pharynx central, occupies 1 / 3 of the body size. Male and female reproductive organs located in the second 1 / 2 of the body with the morphological features of P. medvedica . Reproductive system. The male reproductive system consists of a large and muscular interpolated prostatic vesicle, a slightly muscular seminal vesicle, and a large, coiled cirrus. Female copulatory organ with a bulbous vagina and large Lang’s vesicle (Fig. 17 C, D).