Caridina maeana, 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 : 54-57

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.4336351

persistent identifier

http://treatment.plazi.org/id/03D487FE-6B5E-556D-FDBA-77F4FAB68763

treatment provided by

Valdenar

scientific name

Caridina maeana
status

sp. nov.

Caridina maeana   sp. nov.

urn:lsid:zoobank.org:act:36785008-1E93-4AE5-8162-238D2560E30C

Figs 2O View Fig , 17 View Fig , 26 View Fig F–H

Caridina cf. weberi   sp. 4 – de Mazancourt et al. 2019a: 166 View Cited Treatment , 169–170.

Etymology

This new species is named after the local name of the type locality, River Maeana. The name is used as an apposition.

Material examined

Holotype

SOLOMON ISLANDS • ♂, cl 3.6 mm; Malaita Island, Maeana River ; 09°00.056´S, 160°51.893´E; 315 m a.s.l.; 23 Jun. 2015; D. Boseto leg.; DNA voucher: CA1509; MNHN-IU- 2018-2888. GoogleMaps  

Paratypes

SOLOMON ISLANDS – Malaita Island • 1 ♂, cl 3.1 mm; same collection data as for holotype; MNHN-IU- 2018-2889 GoogleMaps   1 ♂, cl 3.3 mm; same collection data as for holotype; MNHN-IU- 2018-2890 GoogleMaps   1 ♂, cl 3.4 mm; same collection data as for holotype; MNHN-IU- 2018-2891 GoogleMaps   1 ♂, cl 3.5 mm; same collection data as for holotype; MNHN-IU- 2018-2892 GoogleMaps   1 ♂, cl 3.5 mm; same collection data as for holotype; MNHN-IU- 2018-2893 GoogleMaps   1 ♂, cl 4.0 mm; same collection data as for holotype; MNHN- IU- 2018-2894 GoogleMaps   . – Choiseul Island • 1 specimen; Sicata River ; 07°22.477´S, 157°20.109´E; 46 m a.s.l.; P. Keith, C. Lord, R. Causse and D. Boseto leg.; DNA voucher: CA2495; MNHN GoogleMaps   1 specimen; same collection data as for preceding; DNA voucher: CA2496; MNHN GoogleMaps   .

Other material

VANUATU • 1 ♀ ovig., cl 5.3 mm; Santo Island , Pelouva River; 14°58.685´S, 166°38.757´E; 279 m a.s.l.; 15 Nov. 2006; P. Gerbeaux, P. Keith and C. Lord leg.; DNA voucher: CA1417; MNHN- IU- 2018-2895 GoogleMaps   .

Comparative material

Caridina weberi var. keiensis ( Roux, 1911)  

INDONESIA • lectotype (selected by Y. Cai, accepted here), ♀ ovig., cl 5.7 mm; Kei Besar, Warka; 5 June 1908; H. Merton leg.; NMB 6 View Materials .IV.b   2 paralectotypes, 2 ♂♂, cl 2.6 mm; same collection data as for lectotype; NMB 6 View Materials .IV.a   2 paralectotypes, 1 ♀, cl 5.5 mm, 1 ♂, cl 3.4 mm; same collection data as for lectotype; NMB 6 View Materials .IV.b   .

Caridina parvirostris ( De Man, 1892)  

INDONESIA • 2 syntypes, ♂♂, cl 3.1–3.2 mm; Flores Island , river near Bombang; Jan. 1889; M. Weber leg.; MHNN-IU-2015-1748   1 syntype, ♀, cl 4.2 mm; same collection data as for preceding; MNHN- IU-2015-1754   .

Description

CEPHALOTHORAX. Suborbital angle indistinguishably fused with antennal spine. Pterygostomian margin rounded. Rostrum ( Fig. 17m View Fig ): bent down, short, 0.3–0.5 of cl, reaching to base or middle of second segment of antennular peduncle, armed with 8–13 teeth on dorsal margin, all on rostrum considerably anterior to orbital margin, ventral margin with 2–5 teeth. Eyes well developed, anterior end reaching to 0.75 length of basal segment of antennular peduncle. Antennular peduncle 0.70 times as long as carapace. Anterolateral angle reaching 0.20 length of second segment, second segment longer than third segment. Stylocerite reaching to 0.62 length of basal segment of antennular peduncle.

PEREIOPODS. Epipods on first four pereiopods. P1 ( Fig. 17a View Fig ): chela about 2.0–2.2 times as long as wide, movable finger 3.1–3.93 times as long as wide, 1.0–1.3 times length of palm; carpus 1.4–1.8 times as long as wide. P2 ( Fig. 17b View Fig ) more slender and longer than first pereiopod, with chela 2.3–2.6 times as long as wide: movable finger 4.6–4.9 times as long as wide, 1.6–2.0 times length of palm; carpus slender, 5.0–5.4 times as long as wide. P3 ( Fig. 17c View Fig ): stout, dactylus ( Fig. 17e View Fig ) 2.4–3.1 times as long as wide (terminal spiniform seta included), with 5–7 spiniform setae on flexor margin in addition to terminal one; propodus 8.6–9.2 times as long as wide, 3.9–5.2 times as long as dactylus. P5 ( Fig. 17d View Fig ): dactylus ( Fig. 17e View Fig ) 2.4–4.4 times as long as wide, ending in two large claws, with 35–47 spiniform setae on flexor margin; propodus 13.0–17.7 times as long as wide, 4.4–6.0 times as long as dactylus.

ABDOMEN. Third abdominal somite with moderately convex dorsal profile. Sixth abdominal somite 0.49 times as long as carapace, 1.6 times as long as fifth somite, slightly shorter than telson.

TELSON ( Fig. 17i View Fig ). 3 times as long as wide, with four or five pairs of dorsal spinules and one pair of dorsolateral spinules; posterior margin with median process, rounded, with 6 very long intermediate setae longer than lateral.

MALE PLEOPODS. Pl1 ( Fig. 17j View Fig ): endopod subrectangular, 2.5 times as long as wide, reaching 0.41 lenght of endopod, with appendix on subdistal outer margin which reaches beyond distal end of endopod on short length. Pl2 ( Fig. 17k View Fig ): appendix masculina reaching 0.70 times length of endopod; appendix interna reaching 0.64 times length of appendix masculina.

PRE- ANAL CARINA ( Fig. 17g View Fig ). High, unarmed.

UROPODAL DIAERESIS ( Fig. 17h View Fig ). With 16–19 spinules.

EGGS ( Fig. 17l View Fig ). Size: 0.49–0.50 × 0.29–0.30 mm.

Habitat

This new species is largely rheophile and prefers fresh and well-oxygenated waters in the higher course of rivers (279–315 m a.s.l.).

Colour pattern ( Fig. 26F View Fig )

The general colour is blueish overall, reddish on the cephalothorax with many red dots all over the body.

Distribution

This species occurs in the Solomon Islands (Malaita and Choiseul) and Vanuatu (Santo Island).

Remarks

This species looks like C. weberi keiensis   from Kei Besar Island ( Indonesia) by its rostrum with 8–13 dorsal teeth (vs 2–13 in C. w. keiensis), all of them on the rostrum, considerably anterior to the orbital margin, and its P5 dactylus ending in two large claws. However, the P2 dactylus is longer, 4.6–4.9 times as long as wide (vs 3.2–4.1), as is the P2 carpus, 5.0–5.4 (vs 3.5–4.5).

This species also looks like C. parvirostris ( De Man, 1892)   from Flores (Indonesia) by its rostrum with 8–13 dorsal teeth (vs 8–10 in C. parvirostris   ), but the P2 carpus is shorter, 5.0–5.4 times as long as wide (vs 6.0–7.4), as is the P2 chela, 2.3–2.6 (vs 2.6–3.0), and its P5 ends in two large claws (vs one claw).

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Atyidae

Genus

Caridina

Loc

Caridina maeana

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