A review and redefinition of the subgenus Aphyobranchius Wildekamp, 1977, in the seasonal killifish genus Nothobranchius Peters, 1868 (Teleostei: Nothobranchiidae), from ephemeral wetlands of eastern Tanzania Author Watters, Brian R. Author Nagy, Béla text Zootaxa 2025 2025-01-20 5570 3 401 446 https://doi.org/10.11646/zootaxa.5570.3.1 journal article 307895 10.11646/zootaxa.5570.3.1 c8b94793-0a82-4385-9777-48826f5c2c9d 1175-5326 14735232 7C1CE642-C779-40B8-A689-1C364888F500

TABLE 5. Morphometric and meristic data of Nothobranchius geminus. SD, standard deviation.

	males				females
	(n = 12)				(n = 7)
	range	mean	SD	range	mean	SD
Standard length (mm)	28.1–32.3			25.8–30.2
Percent of standard length
Total length	125.5–132.5	128	1.8	123.4–131.1	128	3.0
Body depth at pelvic-fin origin	25.3–30.2	28.6	1.5	22.0–26.7	24.7	1.8
Head length	27.9–32.4	29.1	1.3	23.2–30.2	26.5	2.2
Preanal length	52.5–59.8	56.1	1.8	58.2–63.1	60.9	2.2
Predorsal length	61.2–70.8	66.3	2.4	66.1–70.0	67.4	1.3
Prepelvic length	40.5–45.6	43.5	1.4	43.4–49.3	46.2	2.2
Prepectoral length	26.0–32.7	29.3	1.7	22.3–27.4	25.1	1.9
Caudal peduncle length	15.9–21.1	18.6	1.3	18.2–21.4	20.2	1.0
Caudal peduncle depth	13.0–16.2	14.7	1.0	11.6–13.6	12.7	0.6
Dorsal-fin base length	15.6–18.6	17.5	0.8	14.6–16.1	15.4	0.6
Anal-fin base length	25.6–28.3	26.9	0.9	17.9–21.3	20.0	1.2
Caudal-fin length	25.5–32.5	28.0	1.8	23.4–31.1	28.0	3.0
Percent of head length
Head width	51–60	53.8	2.4	45–52	48.9	2.7
Head depth	66–72	69.4	1.8	58–65	60.8	2.8
Interorbital width	41–50	44.3	2.7	38–45	41.2	3.0
Postorbital length	42–51	45.3	2.8	40–49	43.2	2.8
Suborbital depth	10–14	11.8	1.0	12–15	13.3	0.9
Eye diameter	28–34	30.4	2.2	28–35	32.4	2.3
Snout to eye end length	49–58	54.7	2.8	51–60	56.8	2.8
Snout length	21–28	25.3	2.1	22–29	25.9	2.8
Other morphometric ratios
Predorsal length in % of preanal length	112–125	118.3	3.6	106–114	110.7	3.8
Caudal peduncle length in % of its depth	121–130	127.2	3.3	157–164	158.6	2.5
Head width in % of its depth	73–83	77.6	3.3	78–85	80.4	2.5
Meristics	range	mode		range	mode
Dorsal-fin rays	11–13	11		11–13	12
Anal-fin rays	17–21	18		17–20	18
Scales mid-longitudinal series	26–28	27		26–28	27
Scales transverse	11–11	11		11–11	11
Scales circumpeduncular	12–12	12		12–12	12
	(n = 3)				(n = 2)
	range	mean	SD	range	mean	SD
Standard length	35.1–43.4			24.2–25.9
Percent of standard length	min–max	mean	SD	min–max	mean	SD
Total length	123.3–124.8	124.2	0.8	123.9–124.4 124.2		0.3
Body depth at pelvic-fin origin	32.5–35.3	33.6	1.5	31.7–33.1	32.4	1.0
Head length	30.4–33.6	32.5	1.9	33.2–37.2	35.2	2.8
Preanal length	52.3–55.5	53.6	1.7	62.2–66.9	64.6	3.4
Predorsal length	53.0–55.5	53.8	1.5	61.8–66.1	63.9	3.1
Prepelvic length	42.7–43.8	43.1	0.6	41.3–43.2	42.3	1.4
Prepectoral length	30.4–33.6	32.5	1.9	33.2–37.2	35.2	2.8
Caudal peduncle length	20.0–21.7	21.1	0.9	20.5–24.8	22.6	3.1
Caudal peduncle depth	13.1–14.8	14.0	0.8	13.1–16.5	14.8	2.4
Dorsal-fin base length	26.2–29.6	27.9	1.7	23.9–27.7	25.8	2.7
Anal-fin base length	24.3–26.7	25.8	1.3	18.5–21.9	20.2	2.4
Caudal-fin length	23.3–24.8	24.2	0.8	23.9–24.4	24.2	0.3
Percent of head length
Head width	55–58	56.9	1.8	59–63	60.8	2.8
Head depth	85–86	85.8	1.1	80–81	80.7	1.0
Interorbital width	45–49	46.7	2.3	45–48	46.6	1.7
Postorbital length	50–53	50.9	1.6	51–52	51.7	0.7
Suborbital depth	12–16	14.4	2.5	9–12	10.8	2.1
Eye diameter	33–36	34.0	1.4	32–36	34.1	2.7
Snout to eye end length	47–50	48.8	1.4	48–49	48.3	0.9
Snout length	14–18	16.1	2.2	17	17.1	0.5
Other morphometric ratios
Predorsal length in % of preanal length	100–101	100.4	0.8	99	99.1	0.4
Caudal peduncle length in % of its depth	146–153	150.6	3.8	150–156	152.9	4.2
Head width in % of its depth	64–69	66.3	2.7	74–77	75.4	2.5
Meristics	range	mode		min–max	mode
Dorsal-fin rays	15–16	16		15	15
Anal-fin rays	17–18	17		17	17
Scales mid-longitudinal series	25–26	26		25	25
Scales transverse	10	10		10	10
Scales circumpeduncular	12	12		12	12