First records of two species of snake eels, Aplatophis chauliodus and Ophichthus hyposagmatus (Actinopterygii: Anguilliformes: Ophichthidae), from Mexico Author Del Moral-Flores, Luis Fernando 0000-0002-7804-2716 Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México (UNAM), Tlalnepantla, Estado de México, Mexico Author Wakida-Kusunoki, Armando T. 0000-0002-7917-2651 Centro Regional de Investigación Acuícola y Pesquera de Yucalpetén, Instituto Mexicano de Investigación Pesquera y Acuacultura Sustentables, Yucalpetén, Progreso, Yucatán, Mexico Author Ramos-Hernández, Rafael 0000-0002-8592-1874 Centro Regional de Investigación Acuícola y Pesquera de Veracruz, Instituto Mexicano de Investigación Pesquera y Acuacultura Sustentable, Boca del Rio, Veracruz, Mexico Author George-Zamora, Arturo https://orcid.org/0009-0001-2084-4556 Centro Regional de Investigación Acuícola y Pesquera de Puerto Morelos, Instituto Mexicano de Investigación Pesquera y Acuacultura Sustentables, Puerto Morelos, Quintana Roo, Mexico text Acta Ichthyologica et Piscatoria 2024 2024-05-20 54 103 108 journal article 296597 10.3897/aiep.54.119085 ab51956e-291d-48eb-8472-0e5dab83ffc8 4673419C-6522-4F53-B29B-02D8C34CA701

Table 1. Comparative morphometrics data of Aplatophis chauliodus and Ophichthus hyposagmatus collected in Mexico with previous records.

Character	Aplatophis chauliodus				Ophichthus hyposagmatus
	Mexico	Western Atlantic	Venezuela	Brazil	Mexico	Western Atlantic, Type series
	n = 1	n = 10	n = 3	n = 1	n = 1	n = 6
Mexico = this study, Western Atlantic (for Aplatophis chauliodus) = McCosker et al. (1989), Venezuela = Cervigón (1991), Brazil = Sampaio et al. (2017), Western Atlantic (for Ophichthus hyposagmatus) = McCosker and Böhlke (1984); McCosker et al. (1989).
Absolute values [mm]
Total length (TL)	499.0	168.0–804.0	566.0–847.0	670.0	486.0	357.0
Predorsal length	130.7	—	—	180.0	64.8	53.0
Head length	72.8	—	—	103.6	51.7	40.0
Trunk length	187	—	—	342.0	168.0	122.0
Tail length	239	—	—	—	268.0	195.0
Preanal length	263	—	—	370.0	218.0	—
Snout length	8.5	—	—	22.5	10.6	9.5
Upper jaw length	30.5	—	—	40.9	22.7	—
Lower jaw length	32.4	—	—	42.3	21.0	—
Orbital diameter	2.1	—	—	4.1	6.2	5.2
Interorbital width	8.5	—	—	—	7.8	4.1
Pectoral fin length	10.8	—	—	16	14.3	11.9
Base of pectoral fin	—	—	—	—	4.6	3.3
Body depth at gill opening	26.2	—	—	32.6	21.3	11.0
Body depth at level of pectoral fins	23.6	—	—	38.6	20.9	—
Body depth at anus	25.2	—	—	38.3	20.3	13.0
Body width at anus	—	—	—	—	16.8	11.2
Gill opening length	—	—	—	—	8.9	6.8
Relative values [% of TL]
Head length	14.6	14.0–16.0	14.4–16.0	15.5	10.6	11.0–12.0
Trunk length	37.5	34.0–39.0	—	—	34.6	31.0–35.0
Tail length	47.9	46.0–49.0	—	—	55.1	53.0–57.0
Predorsal length	26.2	25.0–28.0	—	—	13.3	14.0–16.0
Body depth (pectoral fins)	4.3	—	5.4 – 5.6	5.8	4.3	—
Body depth (gill openings)	5.3	—	—	—	4.4	2.9–4.5
Body depth (anus)	5.1	—	4.8 – 5.1	5.7	4.2	—
Snout length	1.7	—	2.3 – 2.7	3.3	2.2	—
Orbital diameter	0.4	—	0.3 – 0.8	0.6	1.3	—
Upper jaw length	6.1	—	8.2	6.1	4.7	—
Lower jaw length	6.5	—	9.4	6.3	4.3	—
Pectoral fin length	2.2	—	2.3 – 2.6	2.4	2.9	—