The Sri Lankan spiny eel, Macrognathus pentophthalmos (Teleostei: Mastacembelidae), and its enigmatic decline Author Pethiyagoda, Rohan Author Silva, Anjana Author Maduwage, Kalana Author Kariyawasam, Lalith text Zootaxa 2008 1931 37 48 journal article 48521 10.5281/zenodo.184847 e9f33122-3020-4c1f-9b18-ee9a5de34ffe 1175-5326 184847

TABLE 1. Measurements (as a proportion of head length or standard length) and meristics of Macrognathus pentophthalmos (3 ex., NMSL FF 137, NMSL FF 196, 138.8–221.6 mm SL); M. aral (18 ex., WHT 7510, 130–181 mm SL); and M. guentheri (3 ex. 156–253 mm SL).

Measurements (% of HL)	Range Mean	SD	Range	Mean	Range	Mean
Eye diameter	10.3–13.8 11.7	1.1	9.9–11.0	10.7	8.9–9.9	9.4
Nostril-eye distance Internarial width	7. 7–10.4 8.7 5.8–7.3 6.7	0.9 0.4	8.2–9.7 6.3–6.7	9.1 6.5	7.5–9.8 7.9–8.9	8.4 8.6
Head depth	26.1–29.7 27.7	0.9	25.6–27.0	26.3	25.6–28.5	26.8
Extended head length (% of SL)	117.1–130.3 124.2	3.6	117.8–125.7	121.8	119.1–123.3	120.1
Head length	16.1–18.2 16.9	0.5	16.4–18.4	17.3	12.8–14.5	13.8
Total length Extended pre-dorsal length	106.1–107.7 106.8 31.1–38.0 34.4	0.5 1.9	106.8–108.6 39.2–43.5	107.7 41.0	105.9–110.6 23.3–26.3	107.5 24.5
Pre-dorsal length Post-dorsal length	35.5–40.8 38.3 56.8–63.3 60.0	1.7 1.7	43.3–46.8 51.5–58.4	45.0 54.6	20.7–23.6 74.3–79.5	21.7 76.5
Pre-anal length	53.7–58.4 55.8	1.3	60.0–64.6	61.9	48.6–54.5	52.5
Dorsal-fin breadth Anal-fin breadth	30.4–37.6 32.5 31.0–33.9 32.6	1.6 0.8	32.7–33.1 31.9–34.0	33.0 33.0	37.4–38.8 40.2–41.7	38.0 40.9
Pectoral-fin length	5.5–6.7 6.0	0.3	5.4–6.8	6.1	4.9–5.2	5.0
Caudal-fin length Meristics	6.8–8.0 7.3	0.3	6.9–8.4	7.6	5.4–6.8	6.3
Rostral toothplates	22–27		24		-
Dorsal spines Dorsal-fin rays	18–22 47–52		14–15 50–52		28–30 65–70
Anal spines	2–3		3		3
Anal-fin rays Pectoral-fin rays	47–57 17–20		46–47 20–21		70–72 20
Caudal-fin rays	14–15		14–15		12