ἐξ ὀνύχων λέοντα τεκμαίρεσθαι → judge by the claws, judge by a slight but characteristic mark, small traits give the clue to the character of a person, deduce something from a small indication, identify a lion from its claws
piscĭcŭlus: i, m.
dim. piscis,
I a little fish, Varr. R. R. 3, 5: minuti, Ter. And. 2, 2, 32: parvi, Cic. N. D. 2, 48, 123; Vulg. Marc. 8, 7.
(1) piscĭcŭlus,¹⁴ ī, m., dim. de piscis, petit poisson : Ter. Andr. 369 ; Cic. Nat. 2, 123.