| Main Ref. | Domínguez-Domínguez, O., D.M. Bernal-Zuñiga and K.R. Piller, 2016 |
| Utseende refererar till | |
| Bones in OsteoBase |
| specialiserade organ | |
| annat utseende | always different morphology between mature adults |
| andra färger | always different colors between mature adults |
| Anmärkningar | Coloration varies with respect to age and sex. |
| Särskilt slående egenskaper | |
| Lateral kroppsform | |
| Tvärsnitt | |
| Dorsal profil av huvudet | |
| Ögontyp | |
| Typ av mun/snyte | |
| Munnens placering | |
| Type of scales | |
| Diagnos |
Xenotoca lyonsi differs from the congeners occurring in the Pacific Coast drainages by the combination of the following characters (none unique to the species): females posses 13 dorsal rays (vs. 15 or 16 in X. melanosoma and 14 in X. doadrioi); for males and females the differences are as follows: 14 anal fin rays (vs. 15 or 16 in X. melanosoma), 12 pectoral fin rays (vs. 13 in Xenotoca eiseni), 8 caudal peduncle scales (vs. 9 in Xenotoca eiseni and X. melanosoma), 30-31 scales in a lateral series (vs. 32 in X. doadrioi), 9 transversal scales (vs. 11 or 12 in X. eiseni and X. doadrioi) and 11 suparorbital pores (vs. 10 in X. doadrioi). Both male and female have a smaller eye diameter (head lengthL/ eye diameter = 3.7 vs. 3.0 in X. doadrioi and 3.5 in X. eiseni for females, and head length/ eye diameter= 3.6 vs. 3.3 in X. eiseni in males), high dorsal fin base (standard length /dorsal fin base length = 6.5 vs. 6.9 in X. eiseni for females and and 5.5 vs. 5.9 in X. eiseni in males) (Ref. 117630). |
| Ease of Identification |
| Sidolinjer | avbruten: No |
| Fjäll längs sidolinje | |
| Porbärande fjäll längs sidolinje | |
| Fjäll i lateralserie | 30 - 31 |
| Antal rader fjäll ovan sidolinje | |
| Antal rader fjäll under sidolinje | |
| Fjäll runt stjärtfensspole | 7 - 9 |
| Skäggtömmar | |
| Gälspringor (endast hos hajar/rockor) | |
| Gälräfständer | |
| på undre del av gälbåge | |
| på övre del av gälbåge | |
| totalt | |
| Ryggkotor | |
| preanal | |
| totalt |
| Egenskaper | no striking attributes |
| Antal fenor | 1 |
| Antal småfenor | Dorsal |
| Ventral | |
| Totalt antal hårda fenstrålar | |
| Totalt antal mjuka fenstrålar | 12 - 14 |
| Fettfena | absent |
| Egenskaper | more or less truncate |
| Antal fenor | |
| Totalt antal hårda fenstrålar | |
| Totalt antal mjuka fenstrålar | 13 - 14 |
| Bröstfena | Egenskaper more or less normal |
| Fenstrålar hårda | |
| Fenstrålar mjuka 11 - 13 | |
| Bukfenor | Egenskaper more or less normal |
| Position abdominal before origin of D1 | |
| Fenstrålar hårda | |
| Fenstrålar mjuka |