Disparalona ikarus Kotov & Sinev, 2011

Kotov, Alexey A., Jeong, Hyun Gi & Lee, Wonchoel, 2012, Cladocera (Crustacea: Branchiopoda) of the south-east of the Korean Peninsula, with twenty new records for Korea *, Zootaxa 3368, pp. 50-90 : 73-74

publication ID	https://doi.org/ 10.5281/zenodo.214313
DOI	https://doi.org/10.5281/zenodo.5680431
persistent identifier	https://treatment.plazi.org/id/03B687AA-FFA0-5A5A-25DC-999BFB7DFF11
treatment provided by	Plazi
scientific name	Disparalona ikarus Kotov & Sinev, 2011
status

Treatment

13. Disparalona ikarus Kotov & Sinev, 2011

Figs 18–19 View FIGURE 18 View FIGURE 19

Synonymy. Disparalona ikarus Kotov & Sinev, 2011 , p. 272–276, Figs 1–2.

? Disparalona rostrata (Koch) View in CoL in Kim & Yoon 1987, p. 200–202, Fig. 11 View FIGURE 11 c–e; Yoon 2010, p. 134–135, fig. 73.

Type locality. “Mouth of the Tom River (51°02.137ʹN, 127°53.370ʹE)" (Kotov & Sinev 2011), Amur Area, Russia. Localities in Korea. 2, 6a (see Fig. 1 and Table 1 View TABLE 1 ).

Parthenogenetic female. Body moderately elongated for the genus, postero-dorsal angle distinct, lacking any denticles, posterior margin straight, postero-ventral angle widely rounded ( Fig. 18 View FIGURE 18 A, 19D). A lateral wing-like projection on each side of brood pouch ( Fig. 18 View FIGURE 18 B–C), in anterior view from rounded-triangular to acute ( Fig 18 View FIGURE 18 D–E). Sculpture of low longitudinal folds well-expressed in dorsal portion, visible as longitudinal lines in lateral view. Compound eye 2 times larger than ocellus. Dorsal head pores typical for the genus ( Fig. 18 View FIGURE 18 F). Labral keel relatively narrow, with widely rounded apex ( Fig. 18 View FIGURE 18 G). In posterior portion of ventral margin, setae located slightly submarginally, no setules between them; a row setules submarginally at posterior margin ( Fig. 18 View FIGURE 18 H). Postabdomen elongated in both adults in juveniles ( Fig. 19 View FIGURE 19 A, E), fluently narrowing distally, its length about 3.5 width. Preanal margin straight, preanal angle distinct, anal margin convex, postanal margin regularly curved to the base of postabdominal claw; dorso-distal angle and distal margin not expressed. About 7–8 long and thin singular postanal teeth, rows of setules on anal margin; setules in lateral series short. Postabdominal claw somewhat curved, as long as preanal margin, with a very short basal spine and an additional setule. Antenna I ( Fig. 19 View FIGURE 19 B) and II typical for genus. Limb I with ODL bearing a single seta, IDL with two long setae setulated distally and a short seta with pointed tip ( Fig. 19 View FIGURE 19 C). Size in our material 0.35–0.48 mm.

Notes. This taxon was known from a single locality in the Amur basin. Now it is obvious that it is more widely distributed in the Far East, although the most common species there is D. cf. hamata (Birge, 1879) ( Fig. 20 View FIGURE 20 A–D). Disparalona ikarus differs from the latter in: (1) presence of lateral “wings”; (2) absent striae between reticulation lines; (3) weak dorso-distal angle and distal margin of postabdomen; (4) short basal spines on postabdominal claw; (5) absence of a strong hook-like seta on IDL. Although Kim & Yoon (1987) and Yoon (2010) illustrated their " Disparalona rostrata " only in lateral view, we can conclude that, most probably, they were dealing with D. ikarus , keeping in mind differences between these two species in shape and armature of the postabdomen.