Momonia (Orientmomonia) koreana Pešić, 2014 (Pesic, 2014)

AbéK, Hiroshi, IwasaK, Masahiro A. & Morimoto, Shizuko, 2024, Synonymy of the water mite subgenera Orientmomonia and Kondia in the genus Momonia (Momoniidae, Acari): an evaluation based on morphology and molecular data, Acarologia 64 (2), pp. 353-362 : 356-357

Momonia (Orientmomonia) koreana Pešić, 2014

Specimens examined — One male, from the Otani River, Nov. 19, 2021, K. Inada leg.; thirty-eight males, the same locality as above, Nov. 20, 2021, and Jan. 23, 2022, K. Inada and S. Morimoto leg.

Characteristics — Light green body with dark red eyes ( Fig. 2A ). Idiosoma oblong and flatback; Pl-1–7 surrounding anterior and posterior dorsal plates; posterior end of anterior dorsal plate with a depression; middle of the anterior margin of the posterior dorsal plate with a pair of long setae ( Fig. 3A ). Cx-IV surrounding the genital field, gonopore with three pairs of acetabula ( Fig. 3B ). P-1–5 with 1, 5, 4, 8, 6 setae (including spine and claw) ( Fig. 3C ); P-4 with two ventral spines and one anterodorsal peg-like spine; distal two filiform setae on P-3 and most filiform setae on P-4 long and slender. I-L-5 nearly three times longer than I-L-6, 1.28–1.41 times higher than I-L-4; ratio of length to height 6.78–7.65 in I-L-5, 1.81–2.27 in I-L-6 ( Fig. 3D ); III-L-3–5 and IV-L-3–5 each with 1–3, 3–5, 2–3 distal, long swimming setae and sometimes also with plumose spines ( Fig. 3E ).

Measurements (n = 6) — Idiosoma ventral L/W 472–504/365–410, dorsal L 443–467; anterior dorsal plate L/W 57–65/189–217; posterior dorsal plate L/W 287–303/267–295. Pl-

1–7 L: 69–78, 70–90, 33–45, 66–78, 62–78, 66–74, 53–70. P-1–5 L: 25–34, 63–69, 42–46,

69–80, 40–53. Cx-I–II L/W 123–144/193–209. Gonopore L/W 62–77/42–53. Gnathosoma

L 111–126. Chelicera L 105–120. I-L-1–6 L: 33–49, 86–115, 144–152, 152–160, 278–303,

94–107; I-L-4–6 H: 29, 37–41, 43–57; I-L-5 L/I-L-6 L ratio 2.59–3.05, I-L-5 H/I-L-4 H ratio

1.28–1.41, I-L-5 L/I-L-5 H ratio 6.78–7.65, I-L-6 L/I-L-6 H ratio 1.81–2.27; IV-L-3–6 L:

94–103, 119–131, 145–152, 123–144.

Remarks — The outstanding characteristic of the male is the presence of seven pairs of platelets surrounding the anterior and posterior dorsal plates. This feature is applicable to the monotypic subgenus Orientmomonia established by Pešić (2014) based on a single male specimen of Momonia (Orientmomonia) koreana Pešić, 2014 . Characteristics of the present males accord well with those of M. (O.) koreana , except for a somewhat smaller body size. Length and height ratios of I-L-5 to I-L- 6 in the present males almost agree with those in the male of M. (O.) koreana . The present males have a pair of long setae on the anterior margin of the posterior dorsal plate that were not shown in the original figure (Fig. 8A) M of. (O.) koreana by Pešić (2014). However, after confirming this matter with Dr Pešić, it is proven that these long setae are probably present also in M. (O.) koreana . As a result of morphological examination, it can be concluded that the present male is M. (O.) koreana Pešić, 2014 .

Figures

Figure 2 Dorsal aspect of the unmountedMomoniaspecies. A – male of Momonia(Orientmomonia) koreana; B – female of Momonia(Kondia) sp. Scale bar: 200 μm.

Figure 3 Male of Momonia(Orientmomonia) koreana. A – dorsal view of idiosoma; B – ventral view of idiosoma; C – left palp; D – I-L-1–6. E – IV-L-3–6. Scale bars: 100 μm.