Description of a new species of freshwater shrimp (Decapoda: Caridea: Atyidae) from Mount Danxia, Guangdong, China, based on morphological and molecular evidence Author Wang, Yaqin 0000-0002-5294-0163 Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory of Biocontrol, School of Ecology, Sun Yat-Sen University, Shenzhen, China. Author Chu, Ka Hou Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China. & School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China. Author Ma, Ka Yan Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory of Biocontrol, School of Ecology, Sun Yat-Sen University, Shenzhen, China. text Zootaxa 2024 2024-07-04 5476 1 447 462 http://dx.doi.org/10.11646/zootaxa.5476.1.33 journal article 299627 10.11646/zootaxa.5476.1.33 4e961ee5-4686-4979-be35-32b0225b3760 1175-5326 12696573 DBC661F8-7400-4B8F-8FD3-E04F65C08000

TABLE 2. Key morphological differences between Caridina danxiaensis and morphologically similar species.

Species	Locality	Rostrum length	Stylocerite	Rostrum formula	Spiniform	Reference
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Note: Rostrum formula is presented as: number of dorsal teeth on the carapace posterior margin of orbital margin + number of dorsal teeth on the rostrum anterior to the orbital margin/number of ventral teeth of the rostrum; Spiniform setae are on uropodal diaeresis;*: species without 16S rRNA sequence data.
Caridina danxiaensis	Renhua County,	Reaching to midlength of	Mostly reaching beyond distal end of	5–8+7–8/0	19–23	this study
(this study)	Guangdong Province,	second segment of antennular	basal segment of antennular peduncle,
	China	peduncle	not to the middle of second segment of
			antennular peduncle
Caridina acuta *	Libo County,	Reaching to or slightly	Not reaching distal end of basal segment	0+0–2/0	17–18	Liang et al.
	Guizhou Province,	exceeding distal margin of	of antennular peduncle			(2005)
	China	basal antennular segment, not
		reaching as far as middle of
		second segment
Caridina baoting *	Hainan Province,	Reaching to or slightly	Mostly reaching distal end of basal	0+1–4/1	23	Cai (2014)
	China	exceeding distal margin of	segment of antennular peduncle
		basal antennular segment, not
		reaching as far as middle of
		second segment
Caridina breviata	Hailing Dao Island,	Reaching to or slightly	Reaching beyond distal end of basal	0–2+6/0	16–20	Liang (2004)
	Guangdong Province,	exceeding distal margin of	segment of antennular peduncle, not
	China	basal antennular segment	to the middle of second segment of
			antennular peduncle
Caridina cantonensis	Qingyuan,	Reaching to second segment	Reaching beyond distal end of basal	5–7+2–12/2–6	12–21	Liang (2004)
	Guangdong Province,	of antennular peduncle	segment of antennular peduncle, even
	China		to the middle of second segment of
			antennular peduncle
Caridina caobangensis	Northern Vietnam	Reaching to second	Mostly reaching beyond distal end of	5–7+7–11/3–4	21–22	Li & Liang
		segment or third segment of	basal segment of antennular peduncle,			(2002)
		antennular peduncle	not to the middle of second segment of
			antennular peduncle
Caridina cavernicola	Du’an County,	Overreaching to third	Not reaching distal end of basal segment	7–10+18–29/20–24	12–15	Liang (2004)
	Guangxi Province,	segment of antennular	of antennular peduncle
	China	peduncle
Caridina clinata	Northern Vietnam	Reaching to or slightly	Not reaching distal end of basal segment	2–5+10–10/2–5	14–17	Cai et al. (1999)
		exceeding distal margin of	of antennular peduncle
		basal antennular segment, not
		reaching as far as middle of
		second segment
Caridina conghuensis	New Territories,	Reaching to midlength or	Reaching beyond distal end of basal	3–5+7–9/2–4	17–21	Klotz & Von
	Hong Kong, China	end of second segment of	segment of antennular peduncle, not			Rintelen (2014)
		antennular peduncle	to the middle of second segment of
			antennular peduncle
Caridina cucphuongensis	Northern Vietnam	Just overreaching the eyes	Reaching to end of second segment of	1–3+5–7/0–2	18–21	Yen, et al.
		to reaching to the base of	antennular peduncle or at least 0.7 times			(2021)
		second segment of antennular	of it
		peduncle
Caridina formosae	Taiwan Province,	Not reaching to distal	Not reaching distal end of basal segment	0/0	19–22	Liang (2004)
	China	margin of basal segment of	of antennular peduncle
		antennular peduncle
Caridina haivanensis	Thua Thien-Hue, Hai	Reaching to or slightly	Not reaching to distal end of basal	0+4–11/1–3	13–16	Tan (1990)
	Van, Vietnam	exceeding distal margin of	segment of antennular peduncle
		basal antennular segment, not
		reaching as far as middle of
		second segment
Caridina huananensis	Guangdong Province,	Not reaching to distal	Nearly reaching to distal end of basal	0/1	21–24	Liang (2004)
	China	margin of basal segment of	segment of antennular peduncle
		antennular peduncle
Caridina jiangkou *	Jiangkou County,	Short, straight, reaching to	Reaching 0.75 basal segment length of	0–5+4–7/1–5.	13	Cai & Ng (2018)
	Guizhou Province,	distal end of basal segment of	antennular peduncle
	China	antennular peduncle
Caridina lanceifrons	Southern China	Overreaching to third	Not reaching to distal end of basal	4+10–19/2–5	15–19	Liang (2004)
		segment of antennular	segment of antennular peduncle
		peduncle
Caridina logemanni	New Territories,	Reaching to end of basal	Reaching to 0.40–0.50 times of second	3–7 + 7–15 / 0–6	17–22	Klotz & Von
	Hong Kong, China	segment of antennular	segment of antennular peduncle			Rintelen (2014)
		peduncle, 0.30–0.48 (median
		0.37) times as long as
		carapace
Caridina longshan	Longshan County,	Long, reaching from end of	Not reaching to distal end of basal	6–7+12–15/12–17	11–12	Cai & Ng (2018)
	Hunan Province,	antennular peduncle to end of	segment of antennular peduncle
	China	scaphocerite
Caridina maculata	Yingde County,	Short, nearly reaching the end	Reaching beyond distal end of basal	1–3+6–11/2–3	22	Wang et al. 2008
	Guangdong Province,	of 1st segment of antennal	segment of antennular peduncle
	China	peduncle
Caridina macauensis *	Macau, China	Never reaching beyond distal	Reaching beyond distal end of basal	0+0–3/1–3	18–20	Zhou et al.
		end of basal segment of	segment of antennular peduncle, even			(2021)
		antennular peduncle in lateral	to the middle of second segment of
		view	antennular peduncle
Caridina mariae	New Territories,	Reaching to midlength of	Mostly reaching to end of second	4–6 + 6–9/1–2	16–20	Klotz & Von
	Hong Kong, China	second segment of antennular	segment of antennular peduncle or at			Rintelen (2014)
		peduncle or less frequent to	least 0.7 times of it
		begin or end of this segment
Caridina namdat	Bac Kan Province,	Reaching to middle of	Reaching to 0.8 times length of basal	0/0	15–18	Do et al. (2021a)
	Northeast Vietnam	basal segment of antennular	segment of antennular peduncle
		peduncle
Caridina nanaoensis	Guangdong Province,	Reaching as far as middle of	Reaching as far as middle of second	5–8+5–18/2–6	18–24	Liang (2004)
	China	second segment	segment antennular peduncle
Caridina nguyeni	Cao Bang, Ha Quang,	Reaching to second	Reaching as far as middle of second	9–12+8–16/4–6	12–18	Li & Liang
	Truong Ha, Pac Bo,	segment or third segment of	segment antennular peduncle			(2002)
	Vietnam	antennular peduncle
Caridina pacbo	Cao Bang, Ha Quang,	Short, reaching beyond	Mostly reaching beyond the end of basal	2–6+5–12/0–3	19–20	Do et al. (2020)
	Truong Ha, Pac Bo,	middle or close to end of	segment, sometimes to the middle of
	Vietnam	basal segment of antennular	second segment of antennular peduncle
		peduncle
Caridina pingi *	Jiangsu Province,	Overreaching the distal	Not reaching distal end of basal segment	0+9–16/0–4	16–20	Liang (2004)
	China	margin of second antennular	of antennular peduncle
		segment
Caridina pseudoserrata	Cao Bang, Quang	Reaching the middle of the	/	5–6+5–13/1–2	19–21	Dang & Do
	Yen, Tu Do, Vietnam	second antennular segment				(2007)
Caridina rubropunctata	Thai Nguyen, Dong	Overreaching the 2nd	Reaching as far as middle of second	5–7+5–11/2–4	16–19	Dang & Do
	Hy, Van Lang,	segment to the middle of	segment antennular peduncle			(2007)
	Vietnam	the 3nd segment of the
		antennular peduncle
Caridina serrata	New territories, Hong	Reaching to base of second	Nearly reaching the middle of second	0–5+5–12/0–6	18–21	Cai & Ng (1999)
	Kong, China	segment of antennular	segment antennular peduncle
		peduncle or nearly to distal
		end of this segment
Caridina sinanensis	Pengjiaao, Tangtou	Reaching to the end of the	Short, reaching 0.75–0.88 length of basal	4–10+10–16/3–11	10–12	Xu et al. (2020)
	Town, Sinan County,	2nd segment of antennular	segment
	Guizhou Province,	peduncle
	China
Caridina songtaoensis *	Guizhou Province,	Exceeding distal margin of	Not reaching to distal end of basal	2–4 (usually2–	16–19	Liang (2004)
	China	basal antennular segment or	segment of antennular peduncle	3)+5–11/3–5
		reaching to middle of second
		segment
Caridina spinicrus *	Beiliu County,	Straight, reaching anterior	Reaching 0.7 basal segment length of	7+10/1	13	Cai & Ng (2018)
	Guangxi Province,	half of second segment of	antennular peduncle
	China	antennular peduncle,
Caridina tetrazona *	Guizhou Province,	Nearly reaching to or slightly	Mostly reaching beyond the end of basal	3–8 (usually 5–	18–20	Chen et al.
	China	reaching beyond end of	segment, sometimes to the middle of	7)+4–6/1–2		(2020)
		1st segment of antennular	second segment of antennular peduncle
		peduncle
Caridina thachlam	Northern Vietnam	Never reaching beyond	Not reaching to distal end of basal	0–1/0–1	9	Do et al.
		end of basal segment of	segment of antennular peduncle			(2021b)
		antennular peduncle
Caridina tricincta	Northern Vietnam	Reaching to middle or	Reaching distal end of basal segment of	0–3+0–6/0–5	12–18	Do et al. (2020)
		slightly falling short of distal	antennular peduncle
		end of basal segment of
		antennular peduncle
Caridina trifasciata	Henquin Island near	Reaching near to end of	Reaching beyond end of basal segment	4+7–10/1–4	18–20	Yam & Cai
	Zhuhai, Guangdong	second segment of antennular	of antennular peduncle, not extending to			(2003)
	Province & Hong	peduncle, or slightly beyond	middle of second segment
	Kong, China	it
Caridina venusta	Yingde County,	Only reaching to mid or often	Slightly beyond basal segment of	0/0	21–24	Wang et al.
	Guangdong Province,	to end of eyes, occasionally	antennular peduncle			(2008)
	China	extending to near distal end
		of 1 st segment of antennular
		peduncle
Caridina yunnanensis	Yunnan Province,	Reaching to second segment	Not reaching distal end of basal segment	5–7+4–12/2–8	13–14	Liang (2004)
	China	of antennular peduncle	of antennular peduncle