Solomon’s Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Author
Mazancourt, Valentin de
334E54F3-9FE1-4208-8861-1946579697A5
Unité Biologie des organismes et écosystèmes aquatiques (BOREA), Muséum national d’Histoire naturelle, Sorbonne Université, Université de Caen Normandie, Université des Antilles, CNRS, IRD, CP 26, 57 rue Cuvier 75005 Paris, France. & Museum f ̹ r Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany
valentin.demazancourt@laposte.net
Author
Boseto, David
E2AA5328-9578-4380-9254-3FA0B65807E6
Ecological Solutions in Solomon Islands, Western province, Gizo, Solomon Islands.
dboseto@ecologicalsolutions-si.com
Author
Marquet, Gerard
BB110358-4FA2-4F5B-BF3A-B51F69D81AA9
Unité Biologie des organismes et écosystèmes aquatiques (BOREA), Muséum national d’Histoire naturelle, Sorbonne Université, Université de Caen Normandie, Université des Antilles, CNRS, IRD, CP 26, 57 rue Cuvier 75005 Paris, France.
gmarquet@neuf.fr
Author
Keith, Philippe
FDDE84AB-E459-401C-A9BF-3F16CEEBFD7C
Unité Biologie des organismes et écosystèmes aquatiques (BOREA), Muséum national d’Histoire naturelle, Sorbonne Université, Université de Caen Normandie, Université des Antilles, CNRS, IRD, CP 26, 57 rue Cuvier 75005 Paris, France.
keith@mnhn.fr
text
European Journal of Taxonomy
2020
2020-08-04
696
1
86
journal article
10.5852/ejt.2020.696
5e1d0e63-c052-42fa-ba84-55f2166bfefd
2118-9773
3973435
265EDD08-7AA8-4835-B7F6-353E7992633E
Caridina choiseul
sp. nov.
urn:lsid:zoobank.org:act:
4C3B5DD9-C268-4876-AE84-5FF7CDD01DAE
Figs 2J
,
6
,
25E
Caridina
sp. 2 Solomon –
de Mazancourt
et al.
2019a: 166
, 169–170.
Etymology
Named after the island of
Choiseul
, where this new species occurs. The name is used as a noun in apposition.
Material examined
Holotype
SOLOMON ISLANDS
• ♂, cl
3.9 mm
;
Choiseul
Island
,
Creek
2;
06°59.027´S
,
156°47.913´E
;
93 m
a.s.l.
;
14 Oct. 2014
;
P. Gerbeaux
,
P. Keith
and
G. Marquet
leg.; MNHN-IU-2014-20821.
Paratypes
SOLOMON ISLANDS
–
Choiseul
Island
•
1 ♀
, cl
4.5 mm
; same collection data as for holotype; MNHN-IU-2014-20822
•
1 ♂, cl
3.8 mm
;
Lopakare River
;
07°01.613´S
,
156°46.567´E
;
20 Oct. 2014
;
P. Gerbeaux
,
P. Keith
and
G. Marquet
leg.; MNHN-IU-2014-20823
•
1 ♂, cl 4.0 mm; same collection data as for preceding; MNHN-IU-2014-20824
•
1 ♀
ovig., cl
4.5 mm
; same collection data as for preceding; MNHN-IU-2014-20825
•
1 ♀
ovig., cl
4.7 mm
; same collection data as for preceding; MNHN-IU-2014-20826
•
1 ♀
, cl
4.6 mm
; same collection data as for preceding; DNA voucher: CA1277; MNHN-IU-2014-20827
•
1 ♀
, cl
4.8 mm
; same collection data as for preceding;
MNHN-
IU-2014-20828
•
1 ♂, cl 4.0 mm;
Pisuku River
, sector 1;
06°58.951´S
,
156°46.582´E
;
15 m
a.s.l.
;
10 Oct. 2014
;
P. Gerbeaux
,
P. Keith
and
G. Marquet
leg.; MNHN-IU-2014-20829
•
1 ♂, cl
4.1 mm
; same collection data as for preceding; DNA voucher: CA1285; MNHN-IU-2014-20830
•
1 ♀
, cl
4.7 mm
; same collection data as for preceding; MNHN-IU-2014-20831
•
1 ♀
ovig., cl
5.1 mm
; same collection data as for preceding; MNHN-IU-2014-20832
•
1 ♀
ovig., cl
5.5 mm
; same collection data as for preceding; MNHN-IU-2014-20833
•
1 ♂, cl
4.2 mm
;
Pisuku River
, sector 2;
06°58.900´S
,
156°46.685´E
;
66 m
a.s.l.
;
10 Oct. 2014
;
P. Gerbeaux
,
P. Keith
and
G. Marquet
leg.; MNHN-IU-2014-20834
•
1 ♀
, cl
5.4 mm
; same collection data as for preceding; MNHN-IU-2014-20835
•
1 ♂,
4.2 mm
;
Pisuku River
, upstream;
06°58.965´S
,
156°46.718´E
;
12 Oct. 2014
;
P. Gerbeaux
,
P. Keith
and
G. Marquet
leg.;
MNHN-
IU-2014-20836
•
1 ♀
, cl
4.5 mm
; same collection data as for preceding; MNHN-IU-2014-20837
•
1 ♀
, cl
4.1 mm
; same collection data as for preceding; MNHN-IU-2014-20838
•
1 ♀
, cl
5.1 mm
; same collection data as for preceding; MNHN-IU-2014-20839
.
Comparative material
Caridina variabilirostris
(de
Mazancourt, Marquet & Keith, 2018
)
See
de Mazancourt
et al.
(2018a)
Caridina brachydactyla
(De Man, 1908)
INDONESIA
•
lectotype
(designated by
Richard & Clark 2010
),
♀
ovig., cl
4.8 mm
;
Flores Island
, river near
Reo
;
Nov. 1888
;
M. Weber
leg.;
RMNH
Crust D.
977
•
2 paralectotypes
,
♀♀
ovig., cl
5.3–5.4 mm
;
Flores Island
, river in
Mbawa
;
Jan. 1889
;
M. Weber
leg.;
RMNH 2552
•
1 ♀
, cl
5.8 mm
;
Bali
Island
;
NMB 1054
a
•
2 ♂♂, cl
2.7–3.7 mm
,
1 ♀
ovig., cl
4.3 mm
,
1 ♀
, cl
4.8 mm
;
Sulawesi
,
Palopo
,
Macaui
(locality code: 63.10);
W. Klotz
leg.; ZMB
•
1 ♀
ovig., cl 4.0 mm;
Sulawesi
,
Palopo
,
Tojo
(locality code: 64.10);
W. Klotz
leg.; ZMB
.
Caridina elongapoda
(
Liang & Yan, 1977
)
CHINA
• 3 ♂♂, cl
2.8–3.5 mm
,
1 ♀
, cl
4.2 mm
; Hong Kong, Pak Tam Chung and Kai Sai Chau (locality codes 14.11 and 22.09); W. Klotz leg.; ZMB.
MALAYSIA
• 1 ♂, cl
4.2 mm
,
1 ♀
, cl
4.3 mm
,
1 ♀
ovig., cl
4.3 mm
;
Pulau Tioman
,
Sungai Asah
;
24 Jun. 1997
; Ng et al. leg.;
ZRC 1998.0865
.
Caridina peninsularis
(
Kemp, 1918
)
MALAYSIA
•
lectotype
(designated by Cai
et al
. 2007), ♂, cl
3.2 mm
;
Penang
Island
,
Botanical Garden
;
Feb. 1916
;
N.Anandale
leg.; MNHN-IU-2015-1749
•
1 paralectotype
,
♀
ovig., cl
5.4 mm
; same collection data as for lectotype; MNHN-IU-2015-1750
•
1 paralectotype
,
♀
, cl
3.4 mm
,
1 paralectotype
,
♀
ovig., cl
5.2 mm
,
1 paralectotype
, ♂, cl
3.9 mm
; same collection data as for lectotype;
NHM
1919.11.1.12-21 (1761124)
.
SINGAPORE
•
1 ♀
ovig., cl
5.1 mm
, 1 ♂, cl
4.2 mm
;
Tanglin
[incorrectly spelt
Tangtum
in
NHM
register and on label, see
Richard
&
Clark
2014]; 1958;
Bedford
and
Lanchester
leg.;
NHM
1958.8.7.14–17 (1749569)
.
Caridina variabilis
(
de Mazancourt, Rogers & Keith, 2018
)
See
de Mazancourt et al. (2018b)
.
Caridina sundanella
(
Holthuis, 1978
)
INDONESIA
•
1 syntype
♂, cl
3.6 mm
,
1 syntype
,
♀
, cl
5.2 mm
;
Sumba Island
,
West Sumba
,
4 km
N of Waimangura
,
Waikamburu Brook
,
Station
450;
250 m
a.s.l.
;
19 Aug. 1949
;
E. Sutter
and A. B̹hler leg.;
NMB 989
a
.
Description
CEPHALOTHORAX. Carapace (
Fig.
6m
) smooth, glabrous, with sharp antennal spine placed at lower orbital angle. Pterygostomial margin subrectangular. Variable length rostrum, 0.5–1.2 of cl, 16–28 dorsal teeth closely set, leaving 0.0–0.35 unarmed distally, 1–4 post-orbital teeth present. 7–12 teeth present on ventral margin extending from proximal end either to tip or with short distal part unarmed. Number of dorsal teeth on rostrum before first ventral tooth 13–19. Eyes well developed, anterior end reaching to 0.72 times length of basal segment of antennular peduncle. Antennular peduncle 0.75 (
♀
) – 0.88 (♂) times as long as carapace. Anterolateral angle reaching 0.30 length of second segment, second segment distinctly longer than third segment. Stylocerite reaching to 0.83 length of basal segment of antennular peduncle.
PEREIOPODS. Slender P1 (
Fig. 6a
): chela about 1.8–2.3 times as long as wide, dactylus 3.3–4.8 times as long as wide, 1.3–1.8 length of palm; carpus 1.9–2.4 times as long as wide with shallow excavation on anterior margin. P2 (
Fig. 6b
) more slender and longer than first pereiopod: chela 2.0–27 times as long as wide, dactylus 3.8–6.3 times as long as wide, 1.3–1.8 times length of palm; carpus 4.6–7.7 times as long as wide. P3 (
Fig. 6c
): dactylus (
Fig. 6e
) 2.7–3.8 times as long as wide (terminal spiniform setae included) with 5–6 spiniform setae on flexor margin in addition to terminal one; propodus 13.0–19.6 times as long as wide, 5.0–6.8 times as long as dactylus. P5 (
Fig. 6d
): dactylus (
Fig. 6f
) 3.3–4.9 times as long as wide, with 28–41 spiniform setae on flexor margin; propodus 13.6–25.5 times as long as wide, 4.8–6.5 times as long as dactylus.
ABDOMEN. A typical dorsal hump over third abdominal somite. Sixth abdominal somite 0.7 as long as carapace, 1.9 times as long as fifth somite, slightly shorter than telson.
TELSON (
Fig. 6i
). 2.9–3.2 times as long as wide, with four pairs of dorsal spinules and one pair of dorsolateral spinules; posterior margin with a median process, distal setae short, lateral pair slightly longer than intermediate setae (4–7).
MALE PLEOPODS. Pl1 (
Fig. 6j
): endopod subtriangular, 2.1 times as long as wide, 0.15 times as long as exopod, with an appendix interna placed at distal end. Pl2 (
Fig. 6k
): appendix masculina reaching 0.56 times length of endopod; appendix interna reaching 0.70 of appendix masculina.
PRE- ANAL CARINA (
Fig.
6g
). With a spine or not.
UROPODAL DIAERESIS (
Fig. 6h
). With 9–14 spinules.
EGGS (
Fig. 6l
). Size: 0.40–0.45 ×
0.24–0.28 mm
.
Habitat
This species prefers fresh and well-oxygenated waters. It is found from the lower to the higher course. It is more abundant in the areas situated above waterfalls, where predators are less numerous.
Colour pattern
(
Fig. 25E
)
The colour of the body is hyaline with many red dots.
Distribution
As far as we know, this species is known only from
Choiseul
Island.
Fig. 6.
Caridina choiseul
sp. nov.
a
. First pereiopod.
b
. Second pereiopod.
c
. Third pereiopod.
d
. Fifth pereiopod.
e
. Dactylus of third pereiopod.
f
. Dactylus of fifth pereiopod.
g
. Pre-anal carina.
h
. Uropodal diaeresis.
i
. Telson.
j
. First male pleopod.
k
. Second male pleopod.
l
. Eggs. m–n. Rostrum variations.
o
. Cephalothorax. MNHN-IU-2014-20833 (a–g (top, with spine), h, l), MNHN-IU-2014-20836 (g (botom, without spine)), MNHN-IU-2014-20831 (i), MNHN-IU-2014-20829 (j–k), MNHN- IU-2014-20827 (m), MNHN-IU-2014-20837 (n) and MNHN-IU-2014-20826 (o).
Remarks
In this new species, rostrum length is variable (cl 0.5–1.2), being longer in the lower course and shorter in the upper course, as recently found by
de Mazancourt
et al.
(2017b)
who highlighted the “Pinocchioshrimp effect” on
C. variabilirostris
de
Mazancourt, Marquet & Keith, 2018
from Pohnpei. When the rostrum is short, the general appearance resembles that of
C. mertoni
Roux, 1911
, whereas when the rostrum is long, the general appearance is similar to that of
C. brachydactyla
De Man, 1908
. Similarly,
C. variabilis
de Mazancourt, Rogers & Keith, 2018
from
Guam
and
Palau
shows a longer or a shorter rostrum depending on the altitude.
Caridina choiseul
sp. nov.
looks like
C. variabilis
and
C. variabilirostris
from
Micronesia
by the number of teeth and their placement on the rostrum, the proportions between the joints of pereiopods and egg size. However, it can be differentiated by the pre-anal carina that sometimes has a spine (vs always unarmed in
C. variabilis
and
C. variabilirostris
) and the P5 dactylus that has more spiniform setae on the flexor margin: 28–41 (vs 13–30 and 18–29, respectively).
Caridina choiseul
sp. nov.
is most similar to
C. brachydactyla
De Man, 1908
and
C. peninsularis
Kemp, 1918
, but its P2 chela is stouter (2.0–2.7 times as long as wide vs 2.7–3.2 and 2.8–3.0, respectively) and the pre-anal carina which has a spine or not (vs always armed).
Caridina choiseul
sp. nov.
looks like
Caridina elongapoda
Liang & Yan, 1977
, but the pre-anal carina has a spine or not (vs always unarmed) and its P3 dactylus with 5–6 spiniform setae on the flexor margin in addition to the terminal one (vs 6–7).
Caridina choiseul
sp. nov.
looks like
C. mertoni
Roux, 1911
and
C. sundanella
Holthuis, 1978
, but the pre-anal carina has a spine or not (vs always unarmed) and its rostrum has 7–12 ventral teeth (vs 4–9 and 7–9, respectively).