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Crocodile
flathead goby
Psammogobius biocellatus*
Family Gobiidae
updated
Sep 2020
Where
seen? These rather large gobies with flattened heads are
sometimes seen on some of our shores on sandy areas near seagrass
meadows, or sandy lagoon bottoms. One was seen snatching another goby!
Elsewhere, it is found in intertidal areas, estuaries, lagoons, coastal
rivers and common in mangroves.
Features: Up to
12cm, those seen about 6-8cm long. The head is big but not as flat
as in true flatheads, and rather triangular at the snout. Mouth
is large; with the lower jaw slightly longer than the upper jaw. Eyes
near the top of the head, large and placed close to one another. Some
have a pale bar 'joining' the eyes. Each eye with a single 'eyelid'.
Another of its common names is 'Sleepy goby' perhaps referring to
its lidded eyes. The long body is cylindrical and tapers towards the
tail. Various colours and patterns. Most have colours matching the
surroundings, with alternating dark and light bars on the body.
Sometimes mistaken for true flatheads (Family Platycephalidae).
Here's more on how to tell apart fishes
with flat heads.
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Changi, Jun 10 |
This
one caught another goby!
Sentosa, Jun 07 |
Changi, Jun 10 |
Lower jaw longer than upper.
Single tiny 'eyelid'.
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*Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of
display.
Crocodile
flathead gobies on Singapore shores |
Other sightings on Singapore shores |
Chek Jawa, Oct 08
Photo shared by Toh Chay Hoon on flickr. |
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East Coast Park, Aug 20
Photo shared by Toh Chay Hoon on facebook. |
Tanah Merah, May 09
Photo shared by Loh Kok Sheng on his
blog. |
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Pulau Hantu, Mar 22
Photo shared by James Koh on facebook. |
Links
References
- Larson, Helen
K and Kelvin K. P. Lim. 2005. A
Guide to Gobies of Singapore. Singapore Science Centre.
164pp.
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