Caridina barakoma, Mazancourt & Boseto & Marquet & Keith, 2020

Mazancourt, Valentin de, Boseto, David, Marquet, Gerard & Keith, Philippe, 2020, 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, European Journal of Taxonomy 696, pp. 1-86: 8-11

publication ID

https://doi.org/10.5852/ejt.2020.696

publication LSID

lsid:zoobank.org:pub:265EDD08-7AA8-4835-B7F6-353E7992633E

DOI

http://doi.org/10.5281/zenodo.4336336

persistent identifier

http://treatment.plazi.org/id/E0FB6A6C-EDA8-4667-81F4-695A9632658D

taxon LSID

lsid:zoobank.org:act:E0FB6A6C-EDA8-4667-81F4-695A9632658D

treatment provided by

Valdenar

scientific name

Caridina barakoma
status

sp. nov.

Caridina barakoma   sp. nov.

urn:lsid:zoobank.org:act:E0FB6A6C-EDA8-4667-81F4-695A9632658D

Figs 2G View Fig , 3 View Fig

Caridina brevicarpalis   – Page et al., 2007: 649 (GenBank: DQ478485 View Materials ). — de Mazancourt et al. 2019a: 166, 169–170.

Etymology

This new species in named after the village near the type locality. The name is used as an apposition.

Material examined

Holotype

SOLOMON ISLANDS • ♂, cl 3.7 mm; Vella Lavella Island , Vala Kadju River; 07°49.860´S, 156°42.644´E; 18 m a.s.l.; 28 Oct. 2016; P. Keith and C. Lord leg.; MNHN-IU-2014-20805. GoogleMaps  

Paratypes

SOLOMON ISLANDS – Vella Lavella Island   1 ♂, cl 2.7 mm; same collection data as for holotype; DNA voucher: CA1942; MNHN-IU-2014-20810. – Choiseul Island GoogleMaps   1 ♀ ovig., cl 5.6 mm; Turipi River ; 07°00.661´S, 156°49.075´E; 50 m a.s.l.; 15 Sep. 2014; P. Keith, G. Marquet and M. Mennesson leg.; MNHN-IU-2014-20806 GoogleMaps   1 ♀ ovig., cl 5.6 mm; Lopakare River downstream; 07°01.834´S, 156°45.789´E; 14 m a.s.l.; 21 Sep. 2014; P. Gerbeaux, P. Keith and G. Marquet leg; DNA voucher: CA1364; MNHN-IU-2014-20807 GoogleMaps   1 ♀ ovig., cl 5.8 mm; same collection data as for preceding; MNHN- IU-2014-20808. – Kolombangara Island GoogleMaps   1 ♀, cl 3.6 mm; Vagé River ; 08°05.112´S, 156°59.867´E; 10 Nov. 2015; 21 m a.s.l.; P. Keith, C. Lord and G. Marquet leg.; DNA voucher: CA1521; MNHN- IU-2014-20809. – Isabel Island GoogleMaps   1 specimen; Suavanao, Rakata River ; 15 m a.s.l.; 07.64456° S, 158.71918° E; 27 Oct. 2019; P. Keith, C. Lord, R. Causse and D. Boseto leg.; DNA voucher: CA2511; MNHN GoogleMaps   1 specimen; same collection data as for preceding; DNA voucher: CA2512; MNHN GoogleMaps   1 specimen; same collection data as for preceding; DNA voucher: CA2515; MNHN GoogleMaps   1 specimen; same collection data as for preceding; DNA voucher: CA2516; MNHN GoogleMaps   .

INDONESIA • 1 ♀ ovig., cl 7.0 mm; West Papua, Kayumera , found in a fish’s gut content; 03°53.525´S, 134°28.621´E; 22 Oct. 2010; P. Keith leg.; MNHN-IU-2014-20820 GoogleMaps   .

PAPUA NEW GUINEA – New Britain Island • 1 ♀ ovig., cl 5.1 mm; Wara Creek ; 05°38.843´S, 150°39.012´E; 29 Oct. 2018; R. Causse, P. Keith and C. Lord leg.; MNHN-IU-2014-20811 GoogleMaps   1 ♀ ovig., cl 6.6mm; same collection data as for preceding; MNHN-IU-2014-20812 GoogleMaps   1 ♀, cl 6.1 mm; same collection data as for preceding; MNHN-IU-2014-20813 GoogleMaps   1 ♀ ovig., cl 5.4 mm; Walindi Creek ; 05°21.187´S, 150°02.693´E; 30 Oct. 2018; R. Causse, P. Keith and C. Lord leg.; MNHN-IU-2014-20814 GoogleMaps   1 ♀ ovig., cl 5.6mm; same collection data as for preceding; MNHN-IU-2014-20815 GoogleMaps   1 ♀ ovig., cl 5.3 mm; Vaavu River ; 05°22.584´S, 150°03.724´E; 30 Oct. 2018; R. Causse, P. Keith and C. Lord leg.; MNHN- IU-2014-20816 GoogleMaps   1 ♀ ovig., cl 5.9 mm; same collection data as for preceding; MNHN-IU-2014-20817 GoogleMaps   1 ♀ ovig., cl 6.2 mm; Crusher ; 05°38.603´S, 150°10.957´E; 31 Oct. 2018; R. Causse, P. Keith and C. Lord leg.; MNHN-IU-2014-20818 GoogleMaps   1 ♀ ovig., cl 6.5 mm; same collection data as for preceding; MNHN-IU-2014-20819 GoogleMaps   .

Description

CEPHALOTHORAX. Antennal spine below suborbital angle. Pterygostomian margin sub rectangular. Rostrum ( Fig. 3m View Fig ) long, 0.9–1.2 of cl, passing end of scaphocerite, armed with 12–16 teeth on dorsal margin, without apical teeth, 0–1 of them situated on carapace behind orbital margin, ventral margin with 5–10 teeth. Eyes well developed, anterior end reaching to 0.50–0.60 length of basal segment of antennular peduncle. Antennular peduncle 0.72 (♀) or 0.88 (♂) times as long as carapace. Anterolateral angle reaching 0.20 length of second segment, basal segment of antennular peduncle longer than sum of second and third segment lengths, second segment distinctly longer than third segment. Stylocerite reaching 0.75–0.78 length of basal segment of antennular peduncle.

PEREIOPODS. Epipods on first four pereiopods. P1 ( Fig. 3a View Fig ): chela about 1.9–2.1 times as long as wide, movable finger 2.3–2.9 times as long as wide, 0.7–1.0 times length of palm; carpus 1.1–1.6 times as long as wide. P2 ( Fig. 3b View Fig ) more slender and longer than first pereiopod, with chela 1.8–2.1 times as long as wide: movable finger 3.1–3.8 times as long as wide, 1.2–1.3 times length of palm; carpus stout 2.8–3.7 times as long as wide. P3 ( Fig. 3c View Fig ): stout, very short dactylus ( Fig. 3e View Fig ) 2.1–2.8 times as long as wide (terminal spiniform seta included) with 5–6 spiniform setae on flexor margin including terminal one; short propodus 2.1–2.8 times as long as wide, 4.3–5.4 times as long as dactylus. P5 ( Fig. 3d View Fig ): dactylus ( Fig. 3f View Fig ) very short, 2.0–2.5 as long as wide with 6–17 spiniform setae on flexor margin; propodus 2.0–2.5 times as long as wide, 5.1–9.0 times as long as dactylus.

ABDOMEN. Third abdominal somite with moderarely convex dorsal profile. Sixth abdominal somite 0.58 times cl, 1.6 times as long as fifth somite, shorter than telson.

TELSON ( Fig. 3h View Fig ). 3.2–3.4 times as long as wide, with four to six pairs of dorsal spinules and one pair of dorsolateral spinules; posterior margin with a median process, it is rounded with 4 intermediate setae shorter than lateral ones.

MALE PLEOPODS. Pl1 ( Fig. 3j View Fig ): endopod subtriangular, 2.3 times as long as wide, reaching 0.29–0.41 length of exopod, with an appendix on subdistal outer margin which reaches beyond distal end of endopod with most of its length. Pl2 ( Fig. 3k View Fig ): appendix masculina reaching 0.54–0.56 times length of endopod; appendix interna reaching 0.77 of appendix masculina.

PRE- ANAL CARINA ( Fig. 3g View Fig ). High, armed with a spine.

UROPODAL DIAERESIS ( Fig. 3h View Fig ). With 8–10 spinules.

EGGS ( Fig. 3l View Fig ). Size: 0.21–0.25 × 0.37–0.40 mm.

Habitat

In the vegetation at the edge of the rivers in flowing water in the lower course of rivers.

Colour pattern

Unknown.

Distribution

Only collected in the Solomon Islands (Choiseul, Kolombangara, Vella Lavella, Isabel and Guadalcanal).

Remarks

This new species looks like the type specimens of C. brevicarpalis   and C. endehensis   both described by De Man (1892), with their very long rostrum, passing the end of the scaphocerite, without apical tooth and its P1 carpus deeply excavated. It can, however, easily be distinguished from C. brevicarpalis   by its rostrum armed with more teeth on the dorsal margin, 12–16 (vs 11–14 for C. brevicarpalis   ) and on the ventral margin 5–10 teeth (vs 4–7), by its P3 propodus 4.3–5.4 times as long as dactylus (vs 4), by its P5 dactylus with fewer spiniform setae on flexor margin 6–17 (vs 20) and by its P5 propodus 5.1–9.0 times as long as dactylus (vs 5). Egg sizes are smaller, 0.21–0.25 × 0.37–0.40 (vs 0.33 × 0.53 according to Bouvier 1925). From C. endehensis   , it can easily be separated by its rostrum slightly overreaching the antennal peduncle (vs far overreaching antennal scale for C. endehensis   ), dorsal margin nearly horizontal (vs ascendant in anterior ½), armed with 12–16 teeth on posterior ¾ (vs 9–23 in posterior ½), armed ventrally with 5–10 teeth (vs 4–24).

In the litterature on C. brevicarpalis   , we only find 3 drawings: in De Man (1892), Bouvier (1925) and Edmondson (1935). The latter studied specimens from Viti Levu ( Fiji) which seem different from our species by their rostrum armed with 18 teeth on the dorsal margin and 7 on the ventral margin (vs respectively 12–16 and 5–10 in C. barakoma   sp. nov. and 11–14 and 4–7 in the type specimens of C. brevicarpalis   ). By their uropodal diaeresis, 10–13, it also seems different from our new species (8–10) and the type specimens (8–9 according Bouvier 1925). Fiji is the easternmost limit of the C. brevicarpalis   complex in the Pacific, as no species of this group occur in Futuna, Samoa or French Polynesia ( Keith et al. 2013). In this paper we postulate that the C. brevicarpalis   group includes several different species allied to C. brevicarpalis   like C. barakoma   sp. nov., C. endehensis   and the Fijian species.

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Atyidae

Genus

Caridina

Loc

Caridina barakoma

Mazancourt, Valentin de, Boseto, David, Marquet, Gerard & Keith, Philippe 2020
2020
Loc

Caridina brevicarpalis

de Mazancourt V. & Klotz W. & Marquet G. & Mos B. & Rogers D. C. & Keith P. 2019: 166
Page T. J. & von Rintelen K. & Hughes J. M. 2007: 649
2007