Disparalona ikarus Kotov & Sinev 2011
Creators: name: Kotov, Alexey A.
name: Jeong, Hyun Gi
name: Lee, Wonchoel
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Branchiopoda
Diplostraca
Disparalona
Disparalona ikarus

description: 13. Disparalona ikarus Kotov & Sinev, 2011
Figs 18–19
Synonymy. Disparalona ikarus Kotov & Sinev, 2011, p. 272–276, Figs 1–2.
? Disparalona rostrata (Koch) in Kim & Yoon 1987, p. 200–202, Fig. 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).
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 A, 19D). A lateral wing-like projection on each side of brood pouch (Fig. 18 B–C), in anterior view from rounded-triangular to acute (Fig 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 F). Labral keel relatively narrow, with widely rounded apex (Fig. 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 H). Postabdomen elongated in both adults in juveniles (Fig. 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 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 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 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.
description: Published as part of 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 *, pp. 50-90 in Zootaxa 3368 on pages 73-74, DOI: 10.5281/zenodo.214313