Echiodon exsilium, pez-perla delgado – Aletas pectorales presentes. Mandíbulas superior e inferior con uno o varios colmillos sinfisales. (UCR 738-6, 14 cm CC, IC).

Encheliophis dubius, pez-perla común – Aletas pectorales presentes. Mandíbulas sin colmillos. (UCR 394-13, 10 cm CC, IC).

Encheliophis vermicularis, pez-perla sin aletas – Sin aletas pectorales. Mandíbulas sin colmillos. (UCR 25-4, 9 cm CC, IC).

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Echiodon exsilium, slender pearlfish – Pectoral fins present. Upper and lower jaws with one to several large symphyseal fangs.

Encheliophis dubius, Pacific pearlfish – Pectoral fins present. Upper and lower jaws without fangs.

Encheliophis vermicularis, worm pearlfish – Pectoral fins absent. Jaws without fangs.