Revision of freshwater shrimps belonging to Caridina weberi complex (Crustacea: Decapoda: Atyidae) from Polynesia with discussion on their biogeography Valentin de Mazancourt, Gérard Marquet, Philippe Keith
To cite this version:
Valentin de Mazancourt, Gérard Marquet, Philippe Keith. Revision of freshwater shrimps belong- ing to Caridina weberi complex (Crustacea: Decapoda: Atyidae) from Polynesia with discussion on their biogeography. Journal of Natural History, Taylor & Francis, 2019, 53 (13-14), pp.815-847. 10.1080/00222933.2019.1612959. hal-02171198
HAL Id: hal-02171198 https://hal.archives-ouvertes.fr/hal-02171198 Submitted on 2 Jul 2019
HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. 1 Revision of freshwater shrimps belonging to Caridina weberi complex
2 (Crustacea: Decapoda: Atyidae) from Polynesia with discussion on their
3 biogeography.
4 Valentin de Mazancourt1*, Gérard Marquet1 and Philippe Keith1
5 1 Muséum national d’Histoire naturelle, Département Adaptations du Vivant, UMR 7208
6 BOREA, CP026, 57, rue Cuvier, F-75231 Paris, Cedex 05
7 * Corresponding author. E-mail: [email protected]
8
1 9 Revision of freshwater shrimps belonging to Caridina weberi complex
10 (Crustacea: Decapoda: Atyidae) from Polynesia with discussion on their
11 biogeography.
12 Caridina weberi, an emblematic species of the ‘C. weberi complex’, was described by
13 De Man in 1892 from different localities in Indonesia. Until now, this species was
14 thought to have a wide distribution in Polynesia. Numerous specimens identified as C.
15 weberi were collected recently from various Polynesian islands. In the context of an
16 integrative taxonomy, they were morphologically and genetically studied. Three new
17 species allied to C. weberi are here described: C. marquesensis n. sp., C. futunensis n.
18 sp. and C. tupaia n. sp.. The occurence of C. rapaensis, another species part of the ‘C.
19 weberi’ complex is confirmed. Descriptions or redescription of these species are given
20 as well as their geographical and ecological distributions. The position of these species
21 in the complex is clarified. A key is provided to facilitate identification.
22 Keywords: 16S, genetic, morphology, integrative taxonomy, freshwater shrimp.
23
24 Introduction
25 The freshwater shrimp genus Caridina, comprising 298 species (WoRMS database, as
26 of May 2018) and mostly present in the Indo-Pacific region, is the most diversified genus of
27 the Atyidae (De Grave et al. 2015) and an important ecological component in the tropical
28 streams (Covich et al. 1999; Pringle et al. 1993). Its high diversity combined with the lack of
29 informative morphological characters has led to a confused taxonomy (Richard and Clark
30 2009). Indeed, until recently, the taxonomy of the genus was mainly based on morphological
31 characters. Some have been proven highly variable within a species (e.g. rostrum shape and
32 indentation or coloration) and so taxonomically non-informative, making it difficult to
2 33 establish boundaries between them (Rintelen and Cai 2009; Mazancourt et al. 2017). Thus,
34 there is a need for an integrative and standardized approach to improve the group’s
35 systematics, focusing on informative morphological features and using molecular characters
36 (Page et al. 2005; Page and Hughes 2011).
37 To illustrate this problem, we focus here on species of the troublesome ‘C. weberi
38 complex’. The taxonomic complexity within the genus Caridina has led previous authors to
39 create groups of species based on morphological characters they share. For example, Bouvier
40 (1925) defined 5 species group: C. nilotica group, C. laevis group, C. africana group, C.
41 brevirostris group and C. typus group. Some of these groups have been split to create new
42 ones as new species were described, such as C. serrata (Cai and Ng 1999; Karge and Klotz
43 2007), C. gracilirostris (Cai and Ng 2007) and C. weberi (Cai and Anker 2004; Cai et al.
44 2009) while others still exist to this day, like C. nilotica and C. typus groups (Karge and Klotz
45 2007).
46 Polynesia forms a triangle between Hawaii, New Zealand and Easter Island (Figure 1).
47 We can distinguish Northern Polynesia (Hawaii), Western Polynesia (Tuvalu, Tokelau, Wallis
48 and Futuna, Tonga, Niu, Samoa islands, Cook Islands) and Eastern Polynesia (French
49 Polynesia, Pitcairn Island and Eastern Island). The occurrence of C. weberi in Polynesia has
50 been reported by Edmondson (1935), Adamson (1935, 1939), Marquet (1988, 1991), Fossati
51 and Marquet (1998), Keith and Vigneux (2002), Keith et al. (2002), Keith and Marquet
52 (2011), and Keith et al. (2013).
53 Streams of Austral, Society and Marquesas Islands (French Polynesia) were
54 prospected by the Muséum national d’Histoire naturelle (MNHN, Paris) from 1983 to 2001
55 and recently in September and October 2017, rivers of Futuna (Territory of Wallis and Futuna
56 islands) in October 2004, rivers of Rarotonga (Cook islands) in July 2010, rivers of Upolu
57 (Samoa) in July 2008 and August 2014. One of the aims of the MNHN is to carry out
3 58 faunistic inventories of rivers in tropical islands in order to establish a better protection of
59 these fragile ecosystems and, in this context, to clarify the taxonomy of poorly known
60 organisms. As we collected more and more specimens from different islands from Polynesia,
61 we started to raise doubts regarding the validity of C. weberi in this area. Thereby, in
62 combining morphological data with a 16S mtDNA analysis, we identified three new species
63 and confirmed the presence of C. rapaensis. The aim of this study is to describe or re-describe
64 them and to compare them to type specimens of species belonging to the C. weberi complex.
65
66 Material and methods
67 Collection of specimens
68 Specimens from Polynesia were collected by electrofishing (portable Dekka 3,000
69 electric device, Germany or SAMUS 1,000, Poland: http://www.electro-fisher.net/). All
70 material preserved in 75%-95% alcohol has been deposited in the collections of the Muséum
71 national d’Histoire naturelle in Paris (MNHN). A total of 42 recent specimens (33 identified
72 as C. weberi from various Polynesian islands and 9 identified as C. rapaensis from Rapa and
73 Rurutu islands) were morphologically studied. As comparative material, syntypes of C.
74 weberi (MNHN-IU-2015-1755) and C. parvirostris (MNHN-IU-2015-1748 and MNHN-IU-
75 2015-1754) preserved in the MNHN collections and type specimens of C. rapaensis
76 (Holotype BPBM 53933 and paratype BPBM 53694) preserved in the Bernice Pauahi Bishop
77 Museum collections (BPBM, Hawaii, USA) were examined.
78
79 DNA extraction, amplification and sequencing
80 DNA was extracted from abdominal tissues fr