Pseudocandona tenuirostris Hiruta & Mawatari, 2013

Smith, Robin James & Kamiya, Takahiro, 2015, Four new species of the subfamily Candoninae (Crustacea, Ostracoda) from freshwater habitats in Japan, European Journal of Taxonomy 136, pp. 1-34 : 23-24

Pseudocandona tenuirostris Hiruta & Mawatari, 2013

Fig. 6D

Pseudocandona tenuirostris Hiruta & Mawatari, 2013: 59–67 , 72–73, figs 7–11, 18.

Pseudocandona rostrata – Matzke-Karasz et al. 2004: 1637, 1638, 1656, appendix 1.

Material examined

2 ♂♂, 2 ♀♀, from Bense Marsh, Tsugaru City, Aomori Prefecture, 40º51’47.2” N, 140º17’51.5” E, collected on 23 Sep. 2004. Locality 5 on Fig. 1. 1 ♂, 2 ♀♀, from Higashidori, Shimokita District, Aomori Prefecture, 41º19’31” N, 141º18’14.44” E, collected on 27 Sep. 2004. Locality 4 on Fig. 1 .

Remarks

This species is very similar to P. rostrata , with small differences in the shape of the medial lobe of the hemipenis and male fifth limb palps. Pseudocandona rostrata was reported from Hokkaido, Japan by Matzke-Karasz et al. (2004), but after a comparison of their specimens and P. tenuirostris it is concluded that they are the same. In particular, the medial lobe is slightly hook-shaped and thinner in P. tenuirostris compared with P. rostrata .

Ecology and distribution

In addition to the site mentioned in Matzke-Karasz et al. (2004), additional specimens were recovered from two localities in Aomori Prefecture (see material examined section above). At Bense Marsh, specimens were collected from sodden ground with small pools of water below a wooden walkway over the marsh. Water chemistry data at time of collecting was as follows: pH 5.24, conductivity 27.5 μS/cm, temperature 20.1 ºC. The Higashidori site consisted of a small boggy area covered in a thick growth of reeds, and surrounded by trees. At time of collecting, there was very little standing water, although the ground was sodden and mossy. A small, shallow hole was made in the sodden ground in order to sample the water. Water chemistry data at time of collecting was as follows: pH 5.98, conductivity 24.1 μS/cm, temperature 16.9 ºC. Matzke-Karasz et al. (2004) reported this species from Kushiro Shitsugen National Park, which is a large marsh, and the nearby lower reaches of the Kottaro River, which flows through the marsh, in Hokkaido (locality 2 on Fig. 1 ). Also in Hokkaido, Hiruta & Mawatari (2013) collected this species from Sarobetsu Marsh, Rishiri Rebun Sarobetsu National Park (locality 3 on Fig. 1 ). This suggests that this species has a preference for marshy, boggy areas in cooler parts of Japan. It is currently known from Aomori Prefecture in the northern part of Honshu, and Hokkaido.

Figures

Fig. 6. A. Pseudocandona becca sp. nov. hemipenis (LBM 1430006264). B. Pseudocandona atmeta sp. nov. hemipenis (LBM 1430006270). C. Pseudocandona falcula sp. nov. hemipenis (LBM 1430006275). D. Pseudocandona tenuirostris Hiruta & Mawatari, 2013 hemipenis. E. Undulacandona colymba sp. nov. hemipenis (LBM 1430006279).

Fig. 1. Map of the main islands of Japan, showing the localities mentioned in the text.