Metadata

Caecogobius personatus

Larson and Husana 2018

ORDERSUB-ORDERFAMILY
GobiiformesGobioideiGobiidae

Synonyms

None.

Country

Philippines

Types

Holotype: PNM 15353, ex ZRC 56329, 49 mm SL, male.

Paratypes: ZRC 56329 49 mm SL male, PNM 15354, 42mm SL female, AMS I.47860-001 39mm SL male.

Distribution

Known only from the type locality: Ugnop Cave, Mindanao Island, Phlippines. Detailed location data withheld in original description for conservation purposes.

Habitat

A vadose cave stream with water colder than average for area suggesting a large body of groundwater, confined for a long period, as habitat. Numerous epigean cyprinid fishes, troglobitic crabs and shrimps, and cave crickets are also found in the cave and probably form the food supply for the fishes. The cyprinid fish is larger than the cave goby and may prey on it.

Systematics

How closely, or not, Caecogobius personatus is related to Caecogobius cryptophthalmus is not settled as too few specimens of either species (4 only for each) are known. Larson and Husana (2018) suggest that they may even be separate genera. Tissue samples for molecular studies of C. personatus were taken and may provide further data in due course. In a detailed morphological study of Mugilogobius and allied genera Larson (2001) placed Caecogobius in the subfamily Gobionellinae and the Mugilogobius clade. She also provided a revised diagnosis of the genus and a drawing of the head of paratype CMK 7249 (which is ZSM 27189 on loan to CMK) of Caecogobius cryptophthalmus. Caecogobius appears to be close to Tamanka siitensis,  a freshwater goby from two crater lakes on Jolo Island, Sulu Archipelago, Philippines, and the two may share a common ancestor. The Sulu Archipelago is directly south east of Mindanao Island and it is very likely that they formed a common landmass at lowered sea level.

Conservation Status

TLO MuG [NE]

Museum Holdings

As above only.

Internet Resources

Zoobank registration

Key References

Berti, R. and Ercolini, A. Journal Article 1991 Caecogobius cryptophthalmus n. gen. n. sp. (Gobiidae: Gobiinae), the first stygobic fish from Philippines
Larson, H.K. Journal Article 2001 A revision of the gobiid fish genus Mugilogobius (Teleostei: Gobioidei), and its systematic placement
Larson, H.K. and Husana, D.E.M. Journal Article 2018 A new species of the blind goby Caecogobius (Gobioidei, Gobiidae, Gobionellinae) from a cave system on Mindanao Island, the Philippines