Ilyocryptus spinifer Herrick 1882
Creators: name: Kotov, Alexey A.
name: Jeong, Hyun Gi
name: Lee, Wonchoel
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Branchiopoda
Diplostraca
Ilyocryptidae
Ilyocryptus
Ilyocryptus spinifer

description: 8. Ilyocryptus spinifer Herrick, 1882
Fig. 10
Synonymy. Ilyocryptus spinifer Herrick, 1882, p. 246, Pl. 8: Figs 2–6; Herrick 1885, p. 39–41, Pl. 9: Figs 1–3; Chiang & Du 1979, p. 182–183, Fig. 119; Kotov & Dumont 2000, p. 88–102, Figs 1–149; Tanaka 2001, p. 221–222, Figs 4 A–E; Kotov & Štifter 2006, p. 139–144, Figs 1, 3, 6–7, 9–11, 69–70; Kotov et al. 2011b, p. 133–135, Fig. 2.
Ilyocryptus agilis Kurz in Kim 1988, Figs 45–46.
Ilyocryptus sordidus (Liévin) in Chiang & Du 1979, Fig. 117; Mizuno & Takahashi 1991, p. 159, text-fig.
Neotype locality. "A small bog located in an inlet stream of Lake Alice, Hubbard County, Minnesota, USA ” (Kotov & Williams 2000). Coordinates are 47º13’30”N, 95º05’00”W.
Localities in Korea. 6a, 8, 14 (see Fig. 1 and Table 1).
Parthenogenetic female. Body triangular-ovoid, high, dorsum almost straight, postero-dorsal angle developed (Fig. 10 A). Body compressed laterally, with well-developed dorsal keel, without lateral horns. Moulting incomplete. Head small, its ventral margin straight (Fig. 10 B). Setae at postero-ventral valve portion also very long. Each seta of ventral margin plumose, each seta posterior edge with stout spine-like setule at base and long setules distally (Fig. 10 C). Postabdomen elongated, anus opening more closely to base than to distal extremity of postabdomen (Fig. 10 D). Preanal teeth 5–11, single, relatively large, increasing in size proximally, located at approximately right angle with margin, sometimes slightly bent. A group of setules near each of teeth. Numerous, relatively robust denticles on postabdomen base. Paired spines numerous, relatively small, reaching preanal margin. Lateral setae 5–7, long, a big gap between basalmost seta and anus. Postabdominal claws long, slightly bent and with tiny denticles in distal portion (Fig. 10 E). Distal spine on claw base longer than proximal one. Setules ventrally on claw basal border short. Postabdominal setae shorter than body. Antennae I long and thin, proximal segment with big finger-like projection and system of hillocks (Fig. 10 B). Distal segment with 5–6 transverse rows of denticles, but without denticles at distal end. Two aesthetascs longer than others and longer than half the distal segment, one of them at a short distance from the rest. Antenna II long. Distal sensory seta and distal burrowing spine long, projecting behind distal end of basal segment (Fig. 10 F). Apical swimming setae long, with short setules. Both lateral setae asymmetrically feathered by short setules, with small hooks on tips. Apical spine on exopod approximately equal to spine on endopod. Length of spine on second segment of exopod shorter or equal to length of third segment. Limbs as described by Kotov & Dumont (2000). Size in our material 0.81–1.04 mm.
Notes. The species was initially described from Minnesota, U.S.A. (Herrick 1882a, b) and then found in many tropical and subtropical localities (Smirnov 1976; Kotov & Dumont 2000). It also penetrates the Nearctic up to 47ºN (Kotov & Williams 2000). The species was known from Japan (Tanaka 2001; Kotov & Štifter 2006). Recently it was found in the Amur basin (51ºN), which probably is the northernmost area of its distribution in the Far East (Kotov et al. 2011a, b). Korean specimens were morphologically undistinguishable from those found in the Amur basin (Kotov et al. 2011b). From illustrations of Kim (1988), it is obvious that he misidentified this taxon from Korea as I. agilis.
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 64-65, DOI: 10.5281/zenodo.214313