Caridina serrata Stimpson, 1860

Tu, Do Van, von Rintelen, Kristina, Klotz, Werner, Hung Anh, Le, Anh Tuan, Tran, Van Dong, Dang, Thi Yen, Phan, Tong Cuong, Nguyen, Ngoc Khac, Hoang, Dang, Phan Doan & von Rintelen, Thomas, 2021, Taxonomy notes and new occurrence data of four species of atyid shrimp (Crustacea: Decapoda: Atyidae) in Vietnam, all described from China, Biodiversity Data Journal 9, pp. 70289-70289 : 70289

Caridina serrata Stimpson, 1860

Caridina serrata Stimpson, 1860: 29. [Type locality: hill above Bekhers, Hong Kong Island, Hong Kong, China; neotype designation by Cai and Ng (1999)].

Caridina serrata - Ortmann (1894): 406; Bouvier (1905): 76; Bouvier (1925): 258, fig. 593; Kemp (1918): 289, fig. 12; Cai and Ng (1999): figs. 2, 3, 6B and 6G.

Caridina serrata Caridina serrata serrata Dang et al. (1980)

Caridina serrata Caridina serrata Liang and Yan (1983) Liang and Yan (1985) Liang and Yan (1986) Dudgeon (1985) Dudgeon (1987) Hung et al. (1993) Shy and Yu (1998)

Materials

Type status: Other material. Occurrence: catalogNumber: ZMB 30306 ; recordedBy: Pham The Cuong; disposition: in collection; Taxon : scientificName: Caridina serrata Stimpson , 1860; kingdom: Animal ; phylum: Arthropoda ; class: Malacostraca ; order: Decapoda ; family: Atyidae ; genus: Caridina ; specificEpithet: serrata; taxonRank: Species ; scientificNameAuthorship: Stimpson , 1860; vernacularName: atyid shrimp; nomenclaturalCode: ICZN; taxonomicStatus: accepted; Location : island: Cu Lao Cham ; country: Vietnam; countryCode: VN; stateProvince: Quang Nam; county: Hoi An ; locality: Stream running into reservoir, Cu Lao Cham Island ; decimalLatitude: 15.94303; decimalLongitude: 108.52297; geodeticDatum: WGS84; georeferenceProtocol: GPS; Identification: identifiedBy: Do Van Tu; dateIdentified: 2020; Event: samplingProtocol: hand net; eventDate: 2017-5-10; year: 2017; month: 5; day: 10; Record Level: type: PhysicalObject; institutionCode: ZMB; collectionCode: ZMB; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence : catalogNumber: OUMNH 201307023 ; recordedBy: Werner & Maria Klotz; disposition: in collection; Taxon : scientificName: Caridina serrata Stimpson , 1860; kingdom: Animal ; phylum: Arthropoda ; class: Malacostraca ; order: Decapoda ; family: Atyidae ; genus: Caridina ; specificEpithet: serrata; taxonRank: Species ; scientificNameAuthorship: Stimpson , 1860; vernacularName: atyid shrimp; nomenclaturalCode: ICZN; taxonomicStatus: accepted; Location: island: Hong Kong; country: China; countryCode: CN; stateProvince: Hong Kong; locality: Lantau Island, middle course of river ; decimalLatitude: 22.2267; decimalLongitude: 113.8801; geodeticDatum: WGS84; georeferenceProtocol: GPS; Identification: identifiedBy: Do Van Tu; dateIdentified: 2020; Event: samplingProtocol: hand net; eventDate: 2011-3-18; year: 2011; month: 3; day: 18; Record Level: type: PhysicalObject; institutionCode: OUMNH; collectionCode: OUMNH; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence : catalogNumber: ZMB 31764 ; recordedBy: Christoph D. Schubart, Larissa Kawasch , Brian H.Y. Ip; disposition: in collection; Taxon : scientificName: Caridina serrata Stimpson , 1860; kingdom: Animal ; phylum: Arthropoda ; class: Malacostraca ; order: Decapoda ; family: Atyidae ; genus: Caridina ; specificEpithet: serrata; taxonRank: Species ; scientificNameAuthorship: Stimpson , 1860; vernacularName: atyid shrimp; nomenclaturalCode: ICZN; taxonomicStatus: accepted; Location: island: Hong Kong; country: China; countryCode: CN; stateProvince: Hong Kong; locality: Lantau Island, Pui O Sanwai Tsuen ; decimalLatitude: 22.2452; decimalLongitude: 113.9769; geodeticDatum: WGS84; georeferenceProtocol: GPS; Identification: identifiedBy: Do Van Tu; dateIdentified: 2020; Event: samplingProtocol: hand net; eventDate: 2013-2-26; year: 2013; month: 2; day: 26; Record Level: type: PhysicalObject; institutionCode: ZMB; collectionCode: ZMB; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence : catalogNumber: ZMB 32189 ; recordedBy: Werner Klotz ; disposition: in collection; Taxon : scientificName: Caridina serrata Stimpson , 1860; kingdom: Animal ; phylum: Arthropoda ; class: Malacostraca ; order: Decapoda ; family: Atyidae ; genus: Caridina ; specificEpithet: serrata; taxonRank: Species ; scientificNameAuthorship: Stimpson , 1860; vernacularName: atyid shrimp; nomenclaturalCode: ICZN; taxonomicStatus: accepted; Location : island: Hong Kong; country: China; countryCode: CN; stateProvince: Hong Kong; locality: Tributary of the Pok Fu Lam Reservoir, close to mouth into reservoir ; decimalLatitude: 22.2662; decimalLongitude: 114.1422; geodeticDatum: WGS84; georeferenceProtocol: GPS; Identification: identifiedBy: Do Van Tu; dateIdentified: 2020; Event: samplingProtocol: hand net; eventDate: 2009-4-6; year: 2009; month: 4; day: 6; Record Level: type: PhysicalObject; institutionCode: ZMB; collectionCode: ZMB; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence: catalogNumber: ZMB 29473 ; recordedBy: Yixiong Cai ; disposition: in collection; Taxon : scientificName: Caridina serrata Stimpson , 1860; kingdom: Animal ; phylum: Arthropoda ; class: Malacostraca ; order: Decapoda ; family: Atyidae ; genus: Caridina ; specificEpithet: serrata; taxonRank: Species ; scientificNameAuthorship: Stimpson , 1860; vernacularName: atyid shrimp; nomenclaturalCode: ICZN; taxonomicStatus: accepted; Location : country: China; countryCode: CN; stateProvince: Guangdong; locality: Xiasliao stream, near Xishan Town , Nan'ao County ; decimalLatitude: 23.44215; decimalLongitude: 116.99551; geodeticDatum: WGS84; georeferenceProtocol: GPS; Identification: identifiedBy: Do Van Tu; dateIdentified: 2020; Event: samplingProtocol: hand net; eventDate: 2005-2-5; year: 2005; month: 2; day: 5; Record Level: type: PhysicalObject; institutionCode: ZMB; collectionCode: ZMB; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence : catalogNumber: ZMB 32190 ; recordedBy: Chris Lukhaup ; disposition: in collection; Taxon : scientificName: Caridina serrata Stimpson , 1860; kingdom: Animal ; phylum: Arthropoda ; class: Malacostraca ; order: Decapoda ; family: Atyidae ; genus: Caridina ; specificEpithet: serrata; taxonRank: Species ; scientificNameAuthorship: Stimpson , 1860; vernacularName: atyid shrimp; nomenclaturalCode: ICZN; taxonomicStatus: accepted; Location : island: Hong Kong; country: China; countryCode: CN; stateProvince: Hong Kong; locality: Lantau Island, North side ; decimalLatitude: 22.26679; decimalLongitude: 113.93352; geodeticDatum: WGS84; georeferenceProtocol: GPS; Identification: identifiedBy: Do Van Tu; dateIdentified: 2020; Event: samplingProtocol: hand net; eventDate: 2009-8-9; year: 2009; month: 8; day: 9; Record Level: type: PhysicalObject; institutionCode: ZMB; collectionCode: ZMB; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence : catalogNumber: ZMB 32306 ; recordedBy: Shen, C.J. (1948); disposition: in collection; Taxon : scientificName: Caridina serrata Stimpson , 1860; kingdom: Animal ; phylum: Arthropoda ; class: Malacostraca ; order: Decapoda ; family: Atyidae ; genus: Caridina ; specificEpithet: serrata; taxonRank: Species ; scientificNameAuthorship: Stimpson , 1860; vernacularName: atyid shrimp; nomenclaturalCode: ICZN; taxonomicStatus: accepted; Location: island: Hong Kong; country: China; countryCode: CN; stateProvince: Hong Kong; locality: Lantau Island, upper course of river ; decimalLatitude: 22.26214; decimalLongitude: 113.96688; geodeticDatum: WGS84; georeferenceProtocol: GPS; Identification: identifiedBy: Do Van Tu; dateIdentified: 2020; Event: samplingProtocol: hand net; eventDate: 2011-1-11; year: 2011; month: 1; day: 11; Record Level: type: PhysicalObject; institutionCode: ZMB; collectionCode: ZMB; basisOfRecord: PreservedSpecimen

Description

Material examined for description. 10 males, cl 3.1-4.7, 5 females, cl 4.0-4.6 (ZMB 30306), Vietnam: Quang Nam Province, Hoi An City, Cu Lao Cham Island, a small stream running into the reservoir, 15°56'34.9''N 108°31'22.7''E, coll. Pham The Cuong, 10 May 2017.

Cephalothorax and cephalic appendages. Carapace length 3.1-4.7 mm. Rostrum short, straight or slightly curved downwards, reaching to the end of basal segment of antennular peduncle, 0.38-0.46 (median 0.43) times as long as carapace, rostral formula: 0-4+3-10/0-2 (n = 10), teeth normal (Fig. 8 a). Suborbital angle acute, completely fused with antennal spine; pterygostomian margin rounded (Fig. 8 a). Eyes well developed with globular cornea, anterior end reaching to 0.6 times length of basal segment of antennular peduncle (Fig. 8 a). Antennular peduncle 0.48-0.51 (median 0.5) times as long as carapace; basal segment 1.83-2.0 (median 1.83) times as long as second segment, second segment 1.2-1.5 (median 1.33) times as long as third segment (Fig. 8 b). Stylocerite reaching to about middle (0.4 times length) of second segment of antennular peduncle (Fig. 8 b). Scaphocerite reaching beyond distal end of antennular peduncle, 3.57-3.64 (median 3.57) times as long as wide (Fig. 8 c).

Abdominal somites, telson and uropods. Sixth abdominal somite 0.41-0.49 (median 0.42) times length of carapace, 1.44-1.67 (median 1.52) times as long as fifth abdominal somite, 0.85-1.0 (median 0.9) times length of telson. Telson length 2.14-2.5 (median 2.36) times as long as proximal width, distal margin triangular, terminating in a short median projection, with 4-5 pairs of dorsal spiniform setae and one pair of dorso-subdistal spiniform setae; distal end with 4 pairs of spiniform setae, lateral pair slightly longer than intermediate pairs (Fig. 8 d). Pre-anal carina rounded, with few setae, lacking tooth or spine. Uropodal diaeresis with 20-22 movable spiniform setae, outermost one slightly shorter than lateral angle (Fig. 8 e).

Pereiopods. Epipod present on first four pereiopods. First pereiopod short, robust, reaching beyond end of basal segment of antennular peduncle; chela 1.69-2.0 (median 1.92) times as long as wide, 1.39-1.56 (median 1.47) times length of carpus; tips of fingers rounded, with hook; dactylus shorter than palm, 0.67-0.92 (median 0.75) times as long as palm; carpus excavated anteriorly, 1.67-1.80 (median 1.73) times as long as wide, 0.78-0.9 (median 0.79) times length of merus; merus 2.11-2.56 (median 2.22) times as long as wide, longer than ischium (Fig. 9 a). Second pereiopod long, slender, reaching beyond end of scaphocerite; chela 2.25-2.79 (median 2.56) times as long as wide, 0.58-0.9 (median 0.64) times length of carpus; tips of fingers rounded, without hook; dactylus 1.33-1.57 (median 1.5) times as long as palm; carpus 5.0-6.67 (median 5.78) times as long as wide, 1.14-1.13 (median 1.14) times as long as merus; merus 5.11-5.83 (median 5.75) times as long as wide, longer than ischium (Fig. 9 b). Third pereiopod slender, reaching beyond end of scaphocerite by its dactylus, terminating in two claws, with four to five accessory spiniform setae on flexor margin, dactylus 3.0-4.0 (median 3.5) times as long as wide (terminal claw and spiniform setae on flexor margin included), propodus 9.0-9.7 (median 9.0) times as long as wide, 3.75-4.86 (median 3.75) times as long as dactylus; carpus 4.2-5.0 (median 4.43) times as long as wide, 0.62-0.78 (median 0.69) times as long as propodus, 0.46-0.64 (median 0.57) times as long as merus; merus 5.5-6.57 (median 6.0) times as long as wide, bearing four strong, movable spiniform setae on posterior margin of outer surface; ischium with one movable spiniform seta (Fig. 9 c). Fifth pereiopod slender, reaching to end of basal segment of antennular peduncle, dactylus 2.17-2.67 (median 2.42) times as long as wide (terminal claw and spiniform setae on flexor margin included), terminating in one large claw, with 37-42 spiniform setae on flexor margin; propodus 10-12 (median 10.72) times as long as wide, 6.25-8.31 (median 7.17) times length of dactylus; carpus 3.8-5.0 (median 4.5) times as long as wide, 0.36-0.46 (median 0.42) times as long as propodus, 0.51-0.65 (median 0.61) times as long as merus; merus 5.83-6.2 (median 5.59) times as long as wide, bearing 3-4 strong, movable spiniform setae on posterior margin of outer surface (Fig. 9 d).

Pleopods. Endopod of male first pleopod extending to 0.7 times length of exopod, sub-rectangular in shape, 2.45-2.75 (median 2.6) times as long as proximal width, inner margin concave, outer margin slightly convex, rounded distally, long plumose setae on outer and distal margins, medium-length setae on inner margin; with appendix interna exceeding terminal margin of endopod by 0.4 times its length (Fig. 9 e). Appendix masculina of male second pleopod slender, finger-shaped, not widened distally, reaching to proximal 0.7 times endopod length, 3.8 times as long as distal width, some short spiniform setae on outer surface and some long spiniform setae on distal surface; appendix interna at the middle of appendix masculina, extending about 0.5 times length of appendix masculina (Fig. 9 f).

Diagnosis

Distribution

Caridina serrata Stimpson, 1860 was recorded from Hong Kong Island only by Cai and Ng (1999), but was later also reported from Lantau island, Hong Kong and (as C. nanaoensis ) from Nanao Island, China ( Klotz and von Rintelen 2014). Here, we present the first record of this species in Cu Lao Cham Island from central Vietnam (Fig. 1 c).

Ecology

Although this species up to now was only recorded from streams on small islands (which are on the continental shelf, i.e. would have been connected to the mainland during glacial maxima; see, for example, Voris 2000), it can be considered a land-locked species, based on egg-size (Table 1 ).

Taxon discussion

Dang et al. (1980) recorded two subspecies of Caridina serrata , namely C. serrata serrata and C. serrata cucphuongensis . In 1999, Cai and Ng revised the C. serrata species group and stated that Caridina serrata serrata Dang, 1980 does not belong to this species because of the length of the rostrum and it is also not a member of the C. serrata species group as the stylocerite is not over-reaching the basal segment of the antennular peduncle. Caridina serrata cucphuongensis was discussed as being different from C. serrata ( Cai and Ng 1999) and was elevated to full species rank ( Cai et al. 1999). Dang and Do (2007a) described C. pseudoserrata from North Vietnam and assigned the specimens identified as C. serrata serrata by Dang et al. (1980) to their new species.