Monommata maculata Harring & Myers, 1930

Min, Hee-Min Yang and Gi-Sik, 2023, New record of three monogononts (Rotifera: Monogononta) from islands of Korea, Journal of Species Research 12 (2), pp. 174-179 : 178

Monommata maculata Harring & Myers, 1930

( Figs. 3B , 4A, B ) ṚIJḍḆṴȐÊḝ (ṵḑ) Monommata grandis : Harring & Myers, 1924, pp. 538 -

540. Monommata maculata Harring & Myers, Myers, 1930 , p.

385.

Material examined. Reservoir in Balmae-ri , Shinan-gun (34°41′53.5″N, 125°56′02.4″E), 25 Sep. 2021, Geon Hyeok Lee. Voucher Number: HNIBRIV547 .

Diagnosis. Body soft. Vitellarium with eight nuclei. Foot glands sac-shaped. Two toes unequal in length. Right toe length 435 μm, left toe 345 μm. Trophi intermediate between virgate and forcipate. Fulcrum thick in lateral view and short. Manubrium with anteriorly expanded lamella and thin elongated rod. Uncus with three thin rod-shaped teeth. Rami with alulae. Inner margin of each ramus with 10 - 12 serrated teeth, 3 - 4 large teeth, and interlocking teeth.

Distribution. Cosmopolitan.

Remarks. Monommata maculata is easily confused with M. grandis because of the morphological similarities of their trophi. However, M. grandis has more than 25 comblike teeth on the inner margin of the ramus, whereas M. maculata has 12 - 14 serrated teeth ( Nogrady and Pourriot, 1995). Because the Korean specimens were found in a contracted state, previously documented external characteristics such as lateral antennae with two round pigmented spots were not observed in this study. However, the morphology of trophi is consistent with those reported in previous studies ( Harring and Myers, 1924; Nogrady and Pourriot, 1995).

Molecular data. A partial COI sequence (759 bp) was obtained from one specimen (GenBank accession number: OQ445413).

Figures

Fig. 3. Line drawings of rotifers. A. Lindia torulosa Dujardin, 1841, dorsal view. B. Monommata maculata Harring & Myers, 1930, lateral view. Scale bars=A, B: 100 μm.

Fig. 4. SEM images of the trophi. A, B. Monommata maculata Harring & Myers, 1930. A. ventral view. B. dorsal view. C, D. Lindia torulosa Dujardin, 1841. C. dorsal view. D. epipharynx. Scale bars=A, C: 10 μm, B, D: 5 μm.