Caridina mongziensis Liang, Yan and Wang, 1987

Cai, Y. & Ng, P. K. L., 2010, A revision of Caridina yunnanensis and its allied species (Crustacea: Decapoda: Caridea: Atyidae) from Yunnan, southern China, with description of one new species, Journal of Natural History 35 (2), pp. 213-227 : 221-222

Caridina mongziensis Liang, Yan and Wang, 1987

Caridina mongziensis Liang, Yan and Wang, 1987: 133 , figures 1-9 (type locality: Mengzi County, Yunnan).

Material examined

HOLOTYPE: ♀, cl. 6.8 mm ( SFU-77-40-1 ), Mengzi County, Yunnan, 1977 .

PARATYPE: One, ♂ cl. 6.6 mm ( SFU-77-40-2 ), data same as holotype.

Diagnosis

Rostrum short, reaching to middle of second segment or end of antennular peduncle. Rostral formula: 5-7 (mode 6) + 4-6/1-4 (mode 3), anterior half of dorsal margin unarmed. Antennular peduncle 0.5 times as long as carapace. Carpus of first pereiopod 1.8-2.3 times as long as high, chela 2.2-2.4 times as long as broad. Carpus of second pereiopod 4.4-4.9 times as long as high, chela 2.7 -3.0 times as long as broad. Propodus of third pereiopod 3.2-3.4 times as long as dactylus, dactylus with six spinules. Propodus of fi fth pereiopod 4.0-4.1 times as long as dactylus, dactylus with 35-40 spinules. Endopod of male first pleopod rectangular, 3.0 times as long as wide, appendix interna reaching slightly beyond distal end of endopod. Appendix masculina with two rows of strong spines; appendix interna short, about 0.25 times as long as appendix masculina. Uropodal diaeresis with 13-18 teeth. Egg size 1.35- 1.59 ✕ 0.93-1.07 mm in diameter.

Habitat

Unknown.

Distribution

Mengzi County, Yunnan ( figure 1 ).

Remarks

Considering the form of the rostrum and the structure of the sexual appendages, Caridina mongziensis closely resembles C. yunnanensis and C. disparidentata . Caridina mongziensis can be distinguished from C. yunanensis by the longer dactylus of the third pereiopod (propodus 3.2-3.4 times as long as dactylus vs 4.0-4.5 times in C. yunnanensis ) and the shorter appendix masculina (one-quarter as long as appendix interna vs one-third in C. yunnanensis ). Caridina mongziensis can be distinguished from C. disparidentata by the carpus of the second pereiopod being 4.4-4.9 times as long as high (vs 3.7-4.2 times in C. disparidentata ), the propodus of the third pereiopod being 3.2-3.4 times as long as the dactylus (vs 3.4-3.8 times in C. disparidentata ), the propodus of the fi fth pereiopod being 4.0-4.1 times as long as the dactylus (vs 3.5-3.9 times in C. disparidentata ), and the endopod of the male first pleopod being 3.0 times as long as wide (vs 3.5 times in C. disparidentata ).

The epiphet mongziensis was incorrectly adopted by the original description after the type locality━Mengzi County ( Liang, Yan and Wang, 1987). Since the name, Caridina mongziensis , has been used more than once in the original description, we thus, follow the code ( ICZN, 1985) to retain the name.

Figures

FIG. 1. Distribution of Caridina yunnanensis species group.

FIG. 2. Caridina yunnanensis. (A) Cephalothorax; female, cl. 6.0 mm (IZAS); (B) cephalothorax, male, cl. 5.1 mm (IZAS); (C) mandible; (D) maxillula; (E) maxilla; (F) first maxilliped; (G) second maxilleped; (H) third maxilliped. Scales: A, B, E, H = 1mm; C, D, F, G = 0.5 mm.

FIG. 3. Caridina yunnanensis. (A) Cephalothorax; male, cl. 4.3 mm (neotype, ZRC.1998.941); (B) cephalothorax, male cl. 4.5 mm (IZAS); (C) scaphocerite; (D) first pereiopod, female; (E) second pereiopod, female; (F) third pereiopod; (G) dactylus of third pereiopod; (H) fifth pereiopod; (I) dactylus of fifth pereiopod. Scales: A-F, H = 1 mm; G, I = 0.5 mm.

FIG. 4. Caridina yunnanensis. Male, cl. 5.1 mm (IZAS). (A) Antennular peduncle; (B) telson; (C) distal portion of telson; (D) first pereiopod; (E) second pereiopod; (F) endopod of male first pleopod, cl. 4.5 mm (IZAS); (G) endopod of male first pleopod, cl. 5.1 mm (IZAS); (H) masculina of male second pleopod, cl. 5.1 mm (IZAS); (I) uropodal diaeresis. Scales: A-E = 1 mm, C, F, G, H, I = 0.2 mm.

FIG. 5. Caridina disparidentata. (A) Anterior portion of cephalothorax, female, cl. 5.0 mm (IZAS); (B) telson; (C) first pereiopod; (D) second pereiopod; (E) third pereiopod. Scales: A-E = 1 mm.

FIG. 6. Caridina dianchiensis. (A) Cephalothorax, male, cl. 5.3 mm (ZRC.1998.905); (B) cephalothorax, female; cl. 4.1 mm; (C) cephalothorax, male, 4.7 mm; (D) second maxilliped; (E) male first pleopod; (F) male second pleopod; (G) endopod of male first pleopod; (H) appendix masculina of male second pleopod. Scales: A, B, C = 1 mm; D, E, F= 0.5 mm; G, H = 0.2 mm.

FIG. 7. Caridina disjuncta (holotype, male, cl. 4.8 mm, SFU; after Cai and Liang, 1999). (A)-(C) Anterior portion of cephalothorax and appendages; (D) distal portion of telson; (E) third maxilliped; (F) first pereiopod; (G) second pereiopod; (H) third pereiopod; (I) dactylus of third pereiopod; (J) fifth pereiopod; (K) dactylus of fifth pereiopod; (L) endopod of male first pleopod; (M) appendix masculina of male second pleopod. Scale: A, B, C = 2 mm; D, L, M = 0.2 mm; E, F, G, H, J = 1 mm; I, K = 0.3 mm.

FIG. 8. Caridina impensa, new species. (A) Anterior portion of cephalothorax, holotype, cl. 5.3 mm (IZAS); (B) cephalothorax, male, cl. 4.2 mm (ZRC.1998.906); (C) cephalothorax, ovigerous female, cl. 6.1 mm (ZRC.1998.907); (D) antennular peduncle; (E) scaphocerite; (F) second maxilliped; (G) third maxilliped; (H) preanal carina; (I) distal portion of telson; (J) uropodal diaeresis. Scales: A-G = 1 mm; I, J = 0.2 mm; H = 0.5 mm.

FIG. 9. Caridina impensa, new species, paratypes. (A) First pereiopod, male (ZRC.1998.906); (B) second pereiopod, male; (C) first pereiopod, female (ZRC.1998.907); (D) second pereiopod, female; (E) third pereiopod; (F) dactylus of third pereiopod; (G) fifth pereiopod; (H) dactylus of fifth pereiopod; (I) male first pleopod; (J) male second pleopod; (K) endopod of male first pleopod; (L) appendix masculina of male second pleopod. Scales: A-E, G = 1 mm; I, J = 0.5 mm; F, H, K, L = 0.2 mm.