Caridina gueryi Marquet, Keith & Kalfatak, 2009

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 : 43-46

Caridina gueryi Marquet, Keith & Kalfatak, 2009

Figs 2X , 13 , 26B

Caridina gueryi Marquet, Keith & Kalfatak, 2009: 159–166 , figs 1–3 (type locality: unnamed river, 15°17´45.30″ S, 167°9´35.98″ E, Santo, Vanuatu).

Caridina buehleri – Klotz et al. 2007: 3–7.

Material examined

Holotype

VANUATU • ♀ ovig., cl 6.8 mm; Santo Island , unnamed river; 15°17´45.30″ S; 167°9´35.98″ E; 22 Jul. 2003; P. Keith and G. Marquet leg.; MNHN-IU-2015-1768.

Paratypes

VANUATU • 1 ♂, cl 3.6 mm; same collection data as for holotype; DNA voucher: CA2428; MNHN- IU-2015-1769 • 1 ♀ ovig., cl 6.0 mm; same collection data as for holotype; MNHN-IU-2015-1771 • 1 ♀ ovig., cl 5.5 mm; same collection data as for holotype; MNHN-IU-2015-1775 .

Other material

SOLOMON ISLANDS – Kolombangara Island • 1 ♀ ovig., cl 4.3 mm; Jack Harbour River ; 08°03.085´S, 157°10.945´E; 11 Nov. 2015; P. Keith, C. Lord and G. Marquet leg.; DNA voucher: CA1519; MNHN-IU- 2015-19 • 1 ♀ ovig., cl 3.9 mm; Vagé River ; 08°5.112´S, 156°59.867´E; 10 Nov. 2015; P. Keith, C. Lord and G. Marquet leg.; MNHN-IU- 2015-17 • 1 ♀ ovig., cl 4.5 mm; Vanga 1 River ; 07°55.088´S, 156°57.624´E; 18 Nov. 2015; P. Keith, C. Lord and G. Marquet leg.; MNHN-IU- 2015-21 .

INDONESIA • 1 ♀ ovig., cl 6.4 mm; Sulawesi, Luwuk Peninsula, W of Ampana, freshwater spring in Mallontong , brackish water pool (field code 70–05); 00°53.125´S, 121°31.371´E; 27 May 2005; M. Glaubrecht, T. von Rintelen and K. Zitzler leg.; ZMB 29000 .

VANUATU • 3 ♀♀ ovig., cl 5–6 mm; Malekula Island , Brenwe River; 16°07.593´S, 167°16.779´E; 54 m a.s.l.; 20 Nov. 2008; P. Feutry, P. Keith, C. Lord and L. Taillebois leg.; MNHN-IU- 2015-23 .

Description

CEPHALOTHORAX. Antennal spine below suborbital angle. Pterygostomian margin sub rectangular. Rostrum ( Fig. 13k ): 0.5–1.4 of cl, reaching to or overreaching distal end of scaphocerite, armed with 9–17 teeth on dorsal margin, 3–5 of them situated on carapace behind orbital margin, ventral margin with 2–7 teeth. Eyes well developed, anterior end reaching to 0.63 length of basal segment of antennular peduncle. Antennular peduncle 0.56–0.57 (♀) times as long as carapace. Anterolateral angle reaching 0.33 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 sharp, long, reaching to about half of second segment of antennular peduncle.

PEREIOPODS. Epipods on first four pereiopods. P1 ( Fig. 13 a–b): chela about 1.9–2.4 times as long as wide, movable finger 2.1–2.7 times as long as wide, 0.4–0.8 times length of palm; carpus 1.2–1.7 times as long as wide. P2 ( Fig. 13c ) more slender and longer than first pereiopod, with chela 2.2–3.0 times as long as wide: movable finger 3.0–4.8 times as long as wide, 1.0–1.7 times length of palm; carpus slender, 4.2–6.7 times as long as wide. P3 ( Fig. 13d ): dactylus ( Fig. 13f ) 2.9–4.0 times as long as wide (terminal spiniform seta included), with 6–7 spiniform setae on flexor margin in addition to terminal one; propodus 8.1–14.0 times as long as wide, 3.5–5.3 times as long as dactylus. P5 ( Fig. 13e ): dactylus ( Fig. 13g ) 3.3–4.4 times as long as wide as with 26–31 spiniform setae on flexor margin; propodus 12.3–20.5 times as long as wide, 4.4–6.2 times as long as dactylus.

ABDOMEN. Third abdominal somite with moderately convex dorsal profile. Sixth abdominal somite 0.48 as long as carapace, 1.5 times as long as fifth somite, shorter than telson.

TELSON ( Fig. 13j ). 2.5 times as long as wide, with 5–6 pairs of dorsal spinules and one pair of dorsolateral spinules; posterior margin with a median process, broadly convex with 7–12 plumose intermediate setae much longer than lateral.

MALE PLEOPODS. Pl1: endopod subtriangular, 2.9 times as long as wide, reaching 0.37 times length of endopod, with an appendix on subdistal outer margin which reaches beyond distal end of endopod with most of its length. Pl2: appendix masculina reaching 0.57 times length of endopod; appendix interna reaching 0.60 of appendix masculina.

PRE- ANAL CARINA ( Fig. 13h ). High, unarmed.

UROPODAL DIAERESIS ( Fig. 13i ). With 17–19 spinules.

EGGS. Size: 0.21–0.33 × 0.33–0.49.

Habitat

This species lives in a typical brackish water environment (brackishwater pools or lower part of rivers, near the estuary). The species is rarely found over the superior limit of the tide-influenced zone, and was not found in the true freshwater zone.

Colour pattern ( Fig. 26B )

Body usually dark red to black, with a lighter dorsal band from the rostrum to the telson and sometimes white stripes on each abdominal somite.

Distribution

This species occurs in the Solomon Islands (Kolombangara), in the Vanuatu archipelago (Malekula and Santo Islands) and in Indonesia (Sulawesi).

Remarks

Our specimens are distinguished from the holotype of C. buelheri from New Ireland by its long P5 propodus, 12.3–20.5 times as long as wide (vs short P5 propodus 9.4 in the holotype of C. buehleri ) and 4.4–6.2 times as long as the dactylus (vs 3.8). In contrast, they fit well with the holotype of C. gueryi from Santo (vs 12.3–15.9 and 4.6–5.2 in the holotype of C. gueryi , respectively). However, if we include other specimens of C. buehleri , the characters overlap, which is the reason why we previously mistakenly placed them in synonymy ( de Mazancourt et al. 2017a). These two species can thus be considered to be cryptic.

According to our molecular results, studied specimens from Sulawesi, the Solomon Islands and the Vanuatu archipelago belong to C. gueryi .

Figures

Fig. 2. Bayesian inference phylogenetic tree of the species studied. Numbers above branches are Bayesian posterior probabilities, numbers under branches are Maximum Likelihood bootstrap values. Results of the three species delimitation methods are indicated by the black bars on the right of the tree. Each bar represents a species recognized by the analysis.

Fig. 13. Caridina gueryi Marquet, Keith & Kalfatak, 2009. a. Details of the fingers of the first pereiopod. b. First pereiopod. c. Second pereiopod. d. Third pereiopod. e. Fifth pereiopod. f. Dactylus of third pereiopod. g. Dactylus of fifth pereiopod. h. Pre-anal carina. i. Uropodal diaeresis. j. Telson. k. Cephalothorax. MNHN-IU-2015-19 (a–k).

Fig. 26. Live colourations. A. Caridina buehleri Roux, 1934 (MNHN-IU-2015-20). B. Caridina gueryi Marquet, Keith & Kalfatak, 2009 (MNHN-IU-2015-19). C. Caridina weberi De Man, 1892 (Kolombangara Island). D. Caridina serratirostris De Man, 1892 (MNHN-IU-2018-2931). E. Caridina papuana Nobili, 1905 (Choiseul Island). Habitats in the Solomon Islands. F. Caridina maeana sp. nov. (Choiseul Island). G. Lentic mode, Lodumoe river, Kolombangara Island. H. Lotic mode, Sulumuni river, Kolombangara Island. Photopgraphs by P. Keith (A, D–F, H) and C. Lord (B–C, G).