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. 2021 Sep 27:9:e70289.
doi: 10.3897/BDJ.9.e70289. eCollection 2021.

Taxonomy notes and new occurrence data of four species of atyid shrimp (Crustacea: Decapoda: Atyidae) in Vietnam, all described from China

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Taxonomy notes and new occurrence data of four species of atyid shrimp (Crustacea: Decapoda: Atyidae) in Vietnam, all described from China

Do Van Tu et al. Biodivers Data J. .

Abstract

Background: Freshwater shrimp of the family Atyidae De Haan, 1849 have been studied in Vietnam for more than a century. A total of 24 species of atyid shrimps from the genera Caridina H. Milne Edwards, 1837, Neocaridina Kubo, 1938, Atyopsis Chace, 1983 have been recorded from Vietnam. With 22 species, the majority are from the genus Caridina. In 2013, Karge and Klotz mentioned the occurrence of four yet undescribed species belonging to Paracaridina Liang, Guo & Tang, 1999 in Vietnam without taxonomic details.In general, studies of freshwater atyids in Vietnam are limited and most Vietnamese taxa await a taxonomic revision. The available data do not fully reflect their estimated species diversity in the country and distribution data are deficient. Here, we focus on four species of atyid shrimps from two genera, viz. Caridinacantonensis Yu, 1938, C.lanceifrons Yu, 1936, C.serrata Stimpson, 1860 and Neocaridinapalmata (Shen, 1948), all described from China and have been reported to occur in Vietnam. The previous reports on the occurrence of these species in Vietnam are largely unreliable due to taxonomic confusion. To contribute to the knowledge of these taxa, we provide the first verified distribution records of the four species in the country with some taxonomic remarks.

New information: This study shows the first taxonomically-verified distribution data of four atyid shrimp species originally described from China, but also reported from Vietnam, albeit under various species names and, in some cases, erroneously. These data allow the first meaningful discussion of the distribution in light of the reproductive strategy of these four species and, in conjunction with the taxonomic remarks, will contribute to the knowledge of these taxa. As a result of this research and data from previous studies, we now consider all four species as widespread and non-endemic, but land-locked (with a complete freshwater life cycle). In Vietnam, all four species are confined to the northern half of the country. Beyond Vietnam, we provide the first records for Caridinalanceifrons from southern Thailand, which suggests a major sampling gap in Indochina.

Keywords: Caridina; Neocaridina; distribution; freshwater fauna; taxonomy.

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Figures

Figure 1a.
Figure 1a.
Caridina cantonensis
Figure 1b.
Figure 1b.
Caridina lanceifrons
Figure 1c.
Figure 1c.
Caridina serrata
Figure 1d.
Figure 1d.
Neocaridina palmata palmata
Figure 2a.
Figure 2a.
Cephalothorax and cephalic appendages
Figure 2b.
Figure 2b.
Antennular peduncle
Figure 2c.
Figure 2c.
Scaphocerite
Figure 2d.
Figure 2d.
Telson
Figure 2e.
Figure 2e.
Uropodal diaeresis.
Figure 3a.
Figure 3a.
First pereiopod
Figure 3b.
Figure 3b.
Second pereiopod
Figure 3c.
Figure 3c.
Third pereiopod
Figure 3d.
Figure 3d.
Fifth pereiopod
Figure 3e.
Figure 3e.
Male first pleopod
Figure 3f.
Figure 3f.
Male second pleopod.
Figure 4.
Figure 4.
Live colouration of Caridinacantonensis Yu, 1938, collected on Cu Lao Cham Island, Hoi An City, Quang Nam Province.
Figure 5a.
Figure 5a.
Cephalothorax and cephalic appendages, lateral view
Figure 5b.
Figure 5b.
Antennular peduncle
Figure 5c.
Figure 5c.
Scaphocerite
Figure 5d.
Figure 5d.
Telson
Figure 5e.
Figure 5e.
Uropodal diaeresis.
Figure 6a.
Figure 6a.
First pereiopod
Figure 6b.
Figure 6b.
Second pereiopod
Figure 6c.
Figure 6c.
Third pereiopod dactylus of third pereiopod
Figure 6d.
Figure 6d.
Fifth pereiopod and dactylus of fifth pereiopod
Figure 6e.
Figure 6e.
Male first pleopod
Figure 6f.
Figure 6f.
Male second pleopod.
Figure 7a.
Figure 7a.
Body yellowish
Figure 7b.
Figure 7b.
Female body dark green with dorsal yellow stripe.
Figure 8a.
Figure 8a.
Cephalothorax and cephalic appendages, lateral view
Figure 8b.
Figure 8b.
Antennular peduncle
Figure 8c.
Figure 8c.
Scaphocerite
Figure 8d.
Figure 8d.
Telson
Figure 8e.
Figure 8e.
Uropodal diaeresis
Figure 9a.
Figure 9a.
First pereiopod
Figure 9b.
Figure 9b.
Second pereiopod
Figure 9c.
Figure 9c.
Third pereiopod and dactylus of third pereiopod
Figure 9d.
Figure 9d.
Fifth pereiopod and dactylus of fifth pereiopod
Figure 9e.
Figure 9e.
Male first pleopod
Figure 9f.
Figure 9f.
Male second pleopod.
Figure 10a.
Figure 10a.
Cephalothorax and cephalic appendages, lateral view
Figure 10b.
Figure 10b.
Antennular peduncle
Figure 10c.
Figure 10c.
Scaphocerite
Figure 10d.
Figure 10d.
Telson
Figure 10e.
Figure 10e.
Uropodal diaeresis.
Figure 11a.
Figure 11a.
First pereiopod
Figure 11b.
Figure 11b.
Second pereiopod
Figure 11c.
Figure 11c.
Third pereiopod
Figure 11d.
Figure 11d.
Third pereiopod (female, cl 5.4)
Figure 11e.
Figure 11e.
Fifth pereiopod.
Figure 12a.
Figure 12a.
Male first pleopod with appendix interna reduced as a small protrusion at base of inflated part
Figure 12b.
Figure 12b.
Male first pleopod with appendix interna as short finger at base of inflated part
Figure 12c.
Figure 12c.
Male second pleopod
Figure 12d.
Figure 12d.
Appendix masculina and interna of male second pleopod.
Figure 13.
Figure 13.
Live colouration of Neocaridinapalmatapalmata (Shen, 1948); collected from Phia Oac-Phia Den National Park, Cao Bang Province, details of the samples are given in the supplementary data.

References

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