Choricotyle sp. 2

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

Choricotyle sp. 2 Figure 7C, D, G

Present study.

Haemulon plumieri (new host)

Measurements (based on two specimens [one immature]).

Body, 1,500-2,100 long. Opisthaptor with eight narrow peduncles. Clamps 208 (175-250; 6) long, 235 (200-287; 8) wide with 8-9 concentric arcs of small skeletal rods in dorsal fields of clamp. Terminal lappet at posterior extremity with one pair (at least) of hooks, each 33-35 long, base 8 wide, with short filament (see Figure 4G) connecting shank and base. Genital atrium 45 long, 40-27 wide, armed with nine spines in a single concentric row. Vas deferens, Ootype and Mehli´s gland, seminal receptacle, genito-intestinal canal, oviduct and total number of testes not observed.

Comments.

Choricotyle sp. 2 has the characteristics and features of Choricotyle (i.e. species having four pairs of clamps and genital spines ranging from seven to twelve and exceptionally, from 28 to 30 in Choricotyle rohdei Cohen, Cardenas, Fernandes & Kohn, 2011). Choricotyle sp. 2 appears closest morphologically to Choricotyle sp. 1 based on the presence of concentric arcs of small skeletal rods in dorsal fields of clamp and terminal lappet with one pair of hooks of relatively similar size (i.e., 33-35 long vs. 27-33 in Choricotyle sp. 1) and having a filament connecting shank and base (see Figure 7F, G). Choricotyle sp. 2 differs from Choricotyle sp. 1 in the general morphology of clamps (subrectangular vs. rod-shaped posterior portion of the medial sclerite, see Mp in Figure 7C), hooks (robust vs. slender shanks, respectively, see Sh in Figure 7) on the terminal lappet, and number of spines of the genital atrium (9 vs. 10). Only two specimens of Choricotyle sp. 2 found on H. plumieri that were flattened and unstained with GAP precluded determination of internal anatomy and the consequent specific assignment of the specimens. A determination may be possible given a more extensive revision of specimens to formally describe this species.

Specimens deposited.

Two reference specimens, CNHE (10619).