Isonychia ignota
Creators: name: Martynov, Alexander V.
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Isonychiidae
Isonychia
Isonychia ignota

description: Isonychia ignota (Walker, 1853)
This species was given for Ukraine in Godunko & Kłonowska- Olejnik (2003) basing on data of Mikulski (1936). The latter article was devoted to Ephemeroptera of Poland that previously included some regions of modern Western Ukraine and Belarus. Mikulski (1936) declared I. ignota for tributaries of the Prypyat’ River without precise points. Basin of this river falls within territory of modern Ukraine and Belarus. During the revision of the collections housed at the Institute of Systematics and Evolution of Animals PAS (Kraków), where the materials of J.S. Mikulski is housed, none specimen of I. ignota from the basin of Prypyat’ River was found (Kłonowska- Olejnik et al. 2005; Godunko R.J. personal communication). Thus, up to know there were no confident records of I. ignota for Ukraine.
We registered I. ignota (Fig. 9) in potamal zone of meddle-sized Horyn’, Styr and Sluch Rivers within Rivne Region (Figs 3, 14, 15). These rivers are the right tributaries of the Prypyat’ River of the first or second orders. We found fresh exuvia of I. ignota at the Styr River in the first decade of August; this confirms that a part of population of I. ignota emerges at this period.
Habitat: In all rivers the larvae were registered at microhabitats with sand, sometimes with small stones or/and pieces of bog iron ore, or silted sand bottom and current velocity from 0.2 to 0.3 m /s. Larvae were collected from bottom and vascular aquatic plants, Potamogeton natans Linnaeus, 1758 and P. pectinatus Linnaeus, 1758 mainly. The additional parameters of waterbodies in collecting places measured during the sampling were: water temperature 23–30°C, water hardness 210–270 ppm, pH 8.6–9.0.
Material: Ukraine, Rivne Region: 15 larvae, vicinity of Zbuzh village, Horyn’ River, 50.990300, 26.320683, h – 154 m a.s.l., Martynov A. V. leg., 7.07.2017 – IN Riv2Isoign/1–2; 1 larva, vicinity of Horodets’ village, Horyn’ River, 51.284421, 26.366363, h – 149 m a.s.l., Martynov A. V. leg., 2.08.2017 – IN Riv8Isoign; 1 larva, 1 exuviae, vicinity of Stara Rafalivka village, Styr River, 51.378866, 25.863339, h – 156 m a.s.l., Martynov A. V. leg., 2.08.2017 – IN Riv7Isoign; 1 larva, vicinity of Sarny town, Sluch River, 51.317445, 26.635826, h – 148 m a.s.l., Martynov A. V. leg., 2.08.2017.
Threats and recommendations for conservation: Water pollution is the most obvious threat to I. ignota. In common with other Ephemeroptera, this species relies upon good water quality. Other concrete threats for I. ignota within Ukraine are not defined. We consider that it deserves to be included in the Red Data Book of Ukraine because of the restricted distribution within the country, its rarity within the whole areal and stenobiotic nature. Detailed investigation (also genetic affinity to other populations) of Ukrainian populations of the species continues.
description: Published as part of Martynov, Alexander V., 2018, New records of some rare mayflies (Insecta, Ephemeroptera) from Ukraine, pp. 48-57 in Ecologica Montenegrina 16 on page 52, DOI: 10.37828/em.2018.16.6, http://zenodo.org/record/8028193