Caridina dali, Wowor, Daisy, 2015

Wowor, Daisy, 2015, The atyid shrimps from Lake Lindu, Central Sulawesi, Indonesia with description of two new species (Crustacea: Decapoda: Caridea), Zootaxa 3957 (5), pp. 501-519 : 506-510

publication ID	https://doi.org/ 10.11646/zootaxa.3957.5.1
publication LSID	lsid:zoobank.org:pub:2AF44C7D-302B-4C4D-8B89-9ABB90E50AE8
DOI	https://doi.org/10.5281/zenodo.6112501
persistent identifier	https://treatment.plazi.org/id/B36387EF-AA09-FFD9-818F-DEC265E6FD46
treatment provided by	Plazi
scientific name	Caridina dali
status	sp. nov.

Treatment

Caridina dali View in CoL sp. nov.

( Figs. 3–4 View FIGURE 3 View FIGURE 4 , 8 View FIGURE 8 B)

Material examined. Holotype: ovigerous female (eggs with eyes), cl 4.7 mm ( MZB Cru 3806), Uwe Wobo at Jambu-Jambu, Lake Lindu, 01°20’30.3”S 120°05’17.2”E, on gravel, or roots of fern and grass, coll. Annawaty & D. Wowor, 21 Nov 2011. Paratypes: 11 females, cl 3.9–4.8 mm, 3 ovigerous females 4.2–4.9 mm ( MZB Cru 3807), same data as holotype; 1 male, cl 3.5 mm, 1 ovigerous female, cl 4.4 mm ( MZB Cru 3808), Uwe Poweroa, Lake Lindu, 01°20’05.6”S 120°05’55.2”E, on roots of macrophytes, coll. Annawaty & D. Wowor, 21 Nov 2011; 12 females, cl 3.8–4.5 mm ( MZB Cru 3809), at the mouth of Air Dingin stream, Lake Lindu, 01°20’07.2’’S 120°05’52.2’’E, on roots of macrophytes, coll. Annawaty & D. Wowor, 21 Nov 2011; 2 males, cl 3.2 mm, 1 female, cl 4.8 mm ( MZB Cru 3810), west side of mouth of Uwe Kati, Lake Lindu, 01°20’54.4”S 120°04’51.0”E, on roots of macrophytes, coll. Annawaty & D. Wowor, 18 Nov 2011; 2 females, cl 3.8 mm ( MZB Cru 3811), at east side of mouth of Uwe Kati, Lake Lindu, 01°20’54.4”S 120°04’51.0”E, on roots of macrophytes, coll. Annawaty & D. Wowor, 16 Nov 2011; 26 males, cl 3.7–4.8 mm, 13 females, cl 4.0– 5.3 mm, 5 ovigerous females, cl 4.8–5.4 mm, 1 male, cl 4.1 mm, dissected ( MZB Cru 3812), Uwe Kati, Lake Lindu catchment, 01°21’54.5”S 120°05’35.2”E, on roots of macrophytes, coll. Annawaty & D. Wowor, 21 Nov 2011; 1 male, 1 female, 1 ovigerous female ( ZRC), same data as MZB Cru 3812. Others: 29 juveniles, 8 males, 9 females, 1 ovigerous female ( MZB Cru 3974), Uwe Kati, Lake Lindu catchment, coll. Annawaty & D. Wowor, 21 Nov 2011.

Description. Rostrum short, overreach end of basal segment to half proximal of second segment of antennular peduncle, 0.4 times as long as carapace, dorsal margin bent downwards above orbit with tip directed anteriorly, dorsal with 1–9 (mode 6) teeth, without tooth behind orbital margin, no sub-apical tooth, ventral with 0–3 (mode 1) teeth. Antennal spine short, situated below inferior orbital angle. Pterygostomian margin rounded ( Fig. 3 View FIGURE 3 A).

Eyes well developed, anterior end 0.6 times length of basal segment of antennular peduncle. Antennular peduncle 0.6–0.7 times as long as carapace, basal segment of antennular peduncle longer than second, third segment lengths, second segment distinctly longer than third segment, anterolateral angle of basal segment reaching 0.3 second segment of antennular peduncle. Stylocerite reaching 0.7 basal segment of antennular peduncle ( Fig. 3 View FIGURE 3 C). Scaphocerite 3.2 times as long as wide ( Fig. 3 View FIGURE 3 B).

Incisor process of mandible ending in 6 irregular teeth and 2 very fine granulated rows between teeth, molar process straight ( Fig. 3 View FIGURE 3 D–E). Lower lacinia of maxillula broadly rounded, upper lacinia elongated, with numerous distinct teeth on inner margin, palp slender ( Fig. 3 View FIGURE 3 F). Upper endite of maxilla subdivided, palp short, scaphognathite tapering posteriorly with numerous long, curved setae at posterior end ( Fig. 3 View FIGURE 3 G). Palp of first maxiliped ending in triangular projection ( Fig. 3 View FIGURE 3 H). Podobranch of second maxiliped reduced to a lamina ( Fig. 3 View FIGURE 3 I). Third maxiliped reaching end of scaphocerite with ultimate segment slightly longer than penultimate segment ( Fig. 3 View FIGURE 3 J).

Epipod present on first 2 pereiopods, reduced in size posteriorly, absent on last 3 pereiopods. Chela and carpus of first pereiopod distinctly stouter, broader than chela and carpus of second pereiopod.

First pereiopod stout, tip of chela not reaching basal segment of antennular peduncle; merus 2.2–2.5 times as long as wide, slightly shorter than carpus; carpus excavated anteriorly, distinctly shorter than chela, 1.7–2.5 times as long as wide, chela 2.0–2.4 times as long as wide; movable finger slightly longer than palm, finger tip round ( Fig. 4 View FIGURE 4 A).

Second pereiopod reach end of third segment of antennular peduncle; merus distinctly shorter than carpus, 4.1–4.8 times as long as wide; carpus slender, 1.3–1.4 times as long as chela, 6.1–6.7 times as long as wide; chela 3.2–3.5 times as long as wide; movable finger 1.4–1.6 times as long as palm, finger tip round ( Fig. 4 View FIGURE 4 B).

Third pereiopod slender, dactylus, half distal propodus overreach third segment of antennular peduncle; propodus 10.0–10.6 times as long as wide, 3.6–4.2 times as long as dactylus; dactylus 3.3–4.2 times as long as wide (terminal spine included, without spines of flexor margin), terminating in 1 large claw with 7–10 (mode 7) accessory spines on flexor margin, reducing in size proximally ( Fig. 4 View FIGURE 4 C–D). Sexual dimorphism present. Third and fourth pereiopods of male with numerous hooked spinules on inner, outer margins of propodus, carpus respectively.

Fifth pereiopod slender, one-third distal of dactylus overreach third segment of antennular peduncle; propodus 11.5–13.7 times as long as wide, 2.7–3.2 times as long as dactylus; dactylus 5.5–6.0 times as long as wide (terminal spine included, without spines of flexor margin), terminating in 1 large claw with 63–80 accessory spinules on flexor margin ( Fig. 4 View FIGURE 4 E–F).

Endopod of male first pleopod subrectangular, without appendix interna, 3.2 times as long as wide, 0.4–0.5 times length of exopod ( Fig. 4 View FIGURE 4 G).

Appendix masculina of male second pleopod very slender, 0.5–0.6 times length of endopod, with appendix interna 0.4–0.5 times length of appendix masculina ( Fig. 4 View FIGURE 4 H).

Sixth abdominal somite 0.5 times as long as carapace, 1.7–1.8 times as long as fifth somite, 0.9 times as long as telson. Telson 2.7 times as long as wide, distal margin rounded without posteromedian projection, with 4 pairs of dorsal spinules, 1 pair of dorsolateral spinules; distal end with 3–6 (mode 3) pairs of spine, lateral pair of spines distinctly longer than intermediate pairs ( Fig. 4 View FIGURE 4 I–J). Preanal carina subtriangular, without spine ( Fig. 4 View FIGURE 4 L).

Uropodal diaeresis with 13–15 (mode 15) movable spinules ( Fig. 4 View FIGURE 4 K).

Ovigerous females with with 39– 40 eggs (n = 2); egg size 1.1–1.2 × 0.7–0.8 mm in diameter (n= 40, eggs with eyes).

Habitat. Caridina dali sp. nov. dwells on roots of macrophytes (water grass and ferns) ( Fig. 9 View FIGURE 9 B). This species mainly occurs at the edge of inlet streams and the edge of the lake that have muddy-sandy substrates. It was found in streams of 0.5–3 m depth, with murky and slow running water that may be almost stagnant. The temperature of the habitat varies from 22.0–28.5°C.

Distribution. Caridina dali sp. nov. is endemic to Lake Lindu and the catchment area. So far, it was found only at the relatively flat southeastern shore of the lake and Uwe Kati. This species has not been encountered in the north and the west coasts of the lake ( Fig. 7 View FIGURE 7. A ).

Etymology. The species is named after its main habitat, dali , a local name for water grass, where this species mainly occur clinging around. The name is used as a noun in apposition.

Remarks. With regard to the shape of the rostrum, the absence of a tooth behind the orbital margin, the position of the antennal spine to the inferior orbital angle, the absence of a median projection at the terminal margin of the telson, the absence of a preanal carina spine, and the absence of an appendix interna at the terminal margin of the sub-rectangular endopod of the first pleopod of male, Caridina dali sp. nov. is similar to C. linduensis and C. parvidentata Roux, 1904 . However, the new species can be differentiated from C. linduensis by the shorter rostrum (ratio of rostrum length to carapace length 0.4 versus 0.5–0.7 in C. linduensis ), the less number of dorsal rostral teeth (1–9, mode 6 versus 7–12, mode 9 in C. linduensis ), the fewer number of ventral rostral teeth (0–3, mode 1 versus 0–6, mode 3 in C. linduensis ), the fewer number of irregular teeth of the incisor process of the mandible (6 versus 16–18 irregular teeth in C. linduensis ), and the larger number of accessory spinules on the flexor margin of the dactylus of the fifth pereiopod (63–80 versus 53–56, mode 54).

Caridina dali sp. nov. can also be distinguished from C. parvidentata by the position of the antennal spine (below inferior orbital angle versus fused with inferior orbital angle in C. parvidentata ), the brouder scaphocerite (3.2 times as long as wide versus 3.8 times in C. parvidentata ), the presence of epipod on the first two pereiopods (vs. on the first three pereiopods in C. parvidentata ), the stouter chela of the second pereiopod (3.2–3.5 times as long as wide versus 3.8 times in C. parvidentata ), the more slender dactylus of the fifth pereiopod (5.5–6.0 times as long as wide versus 4.1 times in C. parvidentata ), the lower ratio of appendix masculina to endopod of male second pleopod (0.5–0.6 times versus 0.8 times in C. parvidentata ), the proportionately broader telson (2.7 times as long as wide versus 3.0 times in C. parvidentata ), the smaller ratio of sixth abdominal somite to telson length (0.9 versus as long as in C. parvidentata ), and the relatively larger egg size (1.1–1.2 × 0.7–0.8 mm versus 0.9 × 0.6 mm in C. parvidentata ). In addition, C. dali sp. nov. can be distinguished from both C. linduensis and C. parvidentata by having more accessory spinules on the flexor margin of the fifth pereiopod (63–80 versus 53–56 in C. linduensis , 61 in C. parvidentata ).