Palatogobius grandoculus
A deepwater goby with exceptionally large eyes and a short snout.
Palatogobius grandoculus is a marine goby in the family Gobiidae and order Gobiiformes. Its genus name combines the Latin palatum (palate) and gobius (goby), referring to teeth that form on its palate. The species name grandoculus comes from grand and oculus (eye), highlighting its unusually large eyes. Although specimens were first collected in 1976 and initially called the Mauve Goby, it was not formally recognized as a distinct species until 2002.
This fish reaches 3.2 cm in total length and has 27 vertebrae. Its dorsal fin has 8 spines and 17–18 soft rays, while the anal fin has 1 spine and 18–19 soft rays. It closely resembles its relative, the Mauve Goby (Palatogobius paradoxus), but differs by having a much larger eye, a shorter snout, and a narrower band of skull between the orbits. Additionally, its body scales extend forward past the origin of the first dorsal fin, whereas other members of the genus have scales that only reach beneath the second dorsal fin.
P. grandoculus lives in marine waters at depths of 253 to 276 meters. It is found in the western Caribbean Sea, particularly near Mexico, and was originally collected near Cancún. It inhabits the sea bed, often above coral fragments or sandy bottoms.
Quick Facts
- Maximum total length
- 3.2 cm
- Number of vertebrae
- 27
- Dorsal fin spines
- 8
- Dorsal fin soft rays
- 17–18
- Anal fin spines
- 1
- Anal fin soft rays
- 18–19
- Depth range
- 253–276 m
Facts from the source article.
Lore & Background
The name Palatogobius grandoculus derives from Latin: palatum (palate) referring to teeth on the palate, and gobius (goby); the species name grandoculus combines grand and oculus, meaning large eye. Specimens were collected as early as 1976 and originally described as the Mauve Goby, but the species was not formally identified as separate and described until 2002. It is very similar in appearance to its relative Palatogobius paradoxus (the Mauve goby), but P. grandoculus has a much larger eye, a shorter snout, and a much narrower band of skull between the orbits. Its body scales extend forward on the sides past the origin of the first dorsal fin, whereas other members of its genus have scales only extending to beneath the second dorsal fin.
Reader's Guide
Palatogobius grandoculus represents a distinct lineage within the genus Palatogobius, distinguished primarily by its large eyes and short snout. Its formal description in 2002, decades after initial collection in 1976, highlights the slow pace of taxonomic resolution for deepwater gobies. The species inhabits depths between 253 and 276 m in the western Caribbean Sea, particularly near Mexico and originally near Cancún, living above coral fragments or sandy bottoms. Its morphological differences from the similar Mauve goby—especially the larger eye and narrower interorbital region—suggest adaptations to low-light environments at depth. The forward extension of body scales past the first dorsal fin origin is a key diagnostic trait separating it from congeners. As a relatively recently described species, its ecological role and population status remain minimally documented, but it contributes to the known diversity of deep-reef gobies in the Caribbean.
Did You Know?
- The species name grandoculus means 'large eye' in Latin.
- Specimens were collected as early as 1976 but not formally described until 2002.
- It has 27 vertebrae and reaches only 3.2 cm total length.
More in Wrasses and Gobies, Part 2 1-24
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