Microcotyle sp.

Mendoza-Franco, Edgar F., Tun, Mariela del Carmen Rosado, Anchevida, Allan de Jesus Duarte & Rodriguez, Rodolfo E. del Rio, 2018, Morphological and molecular (28 S rRNA) data of monogeneans (Platyhelminthes) infecting the gill lamellae of marine fishes in the Campeche Bank, southwest Gulf of Mexico, ZooKeys 783, pp. 125-161 : 125

Microcotyle sp.

Present study.

Archosargus rhomboidalis .

Supplementary observations

(measurements based on three specimens). Body 3,927 (3,235-4,950; 3) long. Maximum width 493 (310-670; 3) at germarium level. Two oral suckers 67 (55-80; 6) long by 44 (38-49; 6) width. Opisthaptor with eight narrow peduncles. Anterior clamps 34 (32-36; 3) long, 64 (58-72; 5) wide. Genital atrium 161 (155-175; 3) wide, with two bilateral zones of small spines lying posterior to the armed genital atrium and 2 posterolateral cavities. Number of testes 21-22, each subspherical 62 (50-70, 7) long, 67 (62-75; 6) wide. Eggs, 195 (187-200; 3) long, 55-105 wide, each with 2 polar filaments.

Comments.

In this host species, A. rhomboidalis , a simultaneous infection with M. archosargi was found. Since all worms could not be identified, the data on infection rate relate to Microcotyle sp. and M. archosargi . The present specimens of Microcotyle sp. resembles those of M. archosargi and M. atriobursata [paratype (CNHE 0188) of Paramicrocotyle atriobursata ] in the general morphology of the genital atrium, 1) two bilateral zones of small spines lying posterior to the armed genital atrium; 2) two posterolateral cavities; 3) genital atrium elliptical, occupying all postbifurcal area; in ventral view, the anterior margin of the atrium is gently curved; posteriorly, the atrium expands into a triangular shape to form an internal cavity surrounded by ventral lips with spines; anterior margin is projected as an operculum on the posterior margin (present in current specimens and M. atriobursata ) (see figures 1 and 5 in Caballero y Caballero and Bravo-Hollis, 1972; Figure 5 in the present study); 4) number of testes, i.e. 21-22 vs. 20-35 in M. archosargi (MacCallum, 1913) and 20-25 in M. atriobursata . Microcotyle sp. differs from these two microcotylids in the width of the genital atrium, i.e. 155-175 vs. 211-242 in M. atriobursata and 80 in M. archosargi. Although current specimens are clearly members of the Microcotyle they were unsatisfactory to clarify details of internal organs for species identification. While intraspecific variation between individuals of Microcotyle sp. and M. archosargi might represent a single species, new collections of specimens of the former species are necessary for completing formal specific identification of this species.

Specimens deposited.

Three reference specimens in the CNHE (10610).