Freshwater ostracods (Crustacea) from Tiantong National Forest Park and Dongqian Lake, eastern China, with descriptions of two new species
Author
Ma, Shunxin
Author
Yu, Na
text
Journal of Natural History
2018
2018-07-27
52
27 - 28
1825
1868
http://dx.doi.org/10.1080/00222933.2018.1489085
journal article
10.1080/00222933.2018.1489085
1464-5262
5175156
2D679051-CBA2-4B09-BCF0-E0152EBC2694
Fabaeformiscandona subacuta
(Yang, 1982, in
Hou et al., 1982
)
(
Figures 4a–c
,
5
)
Candona
(
Candona
)
subacuta
Yang
Hou et al., 1982: 71
, pl. 17, figs. 3–5.
Candona japonica
sp. nov.
Okubo, 1990
, 40–42, fig. 1(j–r).
Fabaeformiscandona japonica
comb. nov.
Schornikov and Trebukhova, 2001: 64
.
Fabaeformiscandona subacuta
comb. nov.
Schornikov, 2004: 458–465
.
Material examined
Three females (ECNU20140907/TT23, 25; ECNU20150419/TT42) and
three males
(ECNU20140907/TT24; ECNU20150419/TT48; ECNU20150418/TT49) dissected.
Dimensions
(Female,
n
= 3) Length,
0.96–1.06 mm
; height,
0.48–0.50 mm
; width,
0.41 mm
. (Male,
n
= 3) Length,
1.13–1.18 mm
; height,
0.58–0.60 mm
.
Brief description
Female
, height of carapace equal to half of length. In dorsal view, LV overlapping RV with flanges both anteriorly and posteriorly. Two setae present on the end of first endopodal segment of A2. The penultimate segment of L7 divided. Claw
Gp
on UR equalling threequarters the length of claw
Ga
. Seta
Sa
small. More than two branches present on UR attachment.
Male
, right palp of L5 large (
Figure 5a
). Left palp L-shaped with distal indentation (
Figure 5b
). Zenker organ with seven rows of chitinized rosettes. Outer lobe on Hp distally pointed (
Figure 5d
).
Distribution
This species is globally widespread and is thought to have originated in Asia (
Escrivà et al. 2012
). In
China
, living examples of
F. subacuta
have been reported from
Beijing
(
Zhai et al. 2017
),
Zhejiang
(
Escrivà et al. 2012
) and
Guizhou
(
Kong et al. 2013
).