Pauline Walsh Jacobson, USA
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Risor ruber (Rosén, 1911)
Risor ruber, the tusked goby, is a species of goby native to the reefs of the western Atlantic Ocean from southern Florida to the Bahamas and from south to northern Brazil. The small goby lives in reefs associated with large sponges, mostly barrel sponges. For example, in Brazil it was often found on or in the tube sponge Aplysina lacunosa, usually together with other fish, various invertebrates and crustaceans.
Risor ruber is currently the only known member of its genus. Etymology: Risor: Latin, risor, -oris = clownish.
It is an obligate sponge goby, which is characterized by a special mouth shape and a special dentition (canine teeth of the upper and lower jaw enlarged and bent back) as well as a reduction in the number of lateral line pores on the head (Böhlke & Robins).
1968). The colloquial term “tusked goby” also refers to this special set of teeth.
The body is elongated, the head is rounded, and the mouth is very blunt. The upper jaw has large, outwardly curved canines and the lower jaw has large, inwardly curved canines. The central canines of both jaws protrude from the mouth. The caudal fin is rounded. The body is scaled behind the anal fin. The tusked goby has 4-5 very coarse scales at the base of the caudal fin, but no lateral line.
The head and body are translucent to dark gray or reedy brown, covered with dense small dark brown dots. The body sometimes has about 4-5 internal irregular brown stripes, sometimes some elongated white spots along the spine.
In a study, this species was found in 55.6% of all sponges collected (70% of tube sponges).
Synonymised names
Garmannia rubra Rosén, 1911 · unaccepted
Jumping guard
A jumping guard prevents (nocturnal) fish from jumping out.
Wrasses, blennies, hawkfishs and gobies jump out of an unprotected tank in fright if their night rest is disturbed, unfortunately these jumpers are found dried up in the morning on carpets, glass edges or later behind the tank.
https://www.korallenriff.de/en/article/1925_5_Jump_Protection_Solutions_for_Fish_in_the_Aquarium__5_Net_Covers.html
A small night light also helps, as it provides the fish with a means of orientation in the dark!
Risor ruber, the tusked goby, is a species of goby native to the reefs of the western Atlantic Ocean from southern Florida to the Bahamas and from south to northern Brazil. The small goby lives in reefs associated with large sponges, mostly barrel sponges. For example, in Brazil it was often found on or in the tube sponge Aplysina lacunosa, usually together with other fish, various invertebrates and crustaceans.
Risor ruber is currently the only known member of its genus. Etymology: Risor: Latin, risor, -oris = clownish.
It is an obligate sponge goby, which is characterized by a special mouth shape and a special dentition (canine teeth of the upper and lower jaw enlarged and bent back) as well as a reduction in the number of lateral line pores on the head (Böhlke & Robins).
1968). The colloquial term “tusked goby” also refers to this special set of teeth.
The body is elongated, the head is rounded, and the mouth is very blunt. The upper jaw has large, outwardly curved canines and the lower jaw has large, inwardly curved canines. The central canines of both jaws protrude from the mouth. The caudal fin is rounded. The body is scaled behind the anal fin. The tusked goby has 4-5 very coarse scales at the base of the caudal fin, but no lateral line.
The head and body are translucent to dark gray or reedy brown, covered with dense small dark brown dots. The body sometimes has about 4-5 internal irregular brown stripes, sometimes some elongated white spots along the spine.
In a study, this species was found in 55.6% of all sponges collected (70% of tube sponges).
Synonymised names
Garmannia rubra Rosén, 1911 · unaccepted
Jumping guard
A jumping guard prevents (nocturnal) fish from jumping out.
Wrasses, blennies, hawkfishs and gobies jump out of an unprotected tank in fright if their night rest is disturbed, unfortunately these jumpers are found dried up in the morning on carpets, glass edges or later behind the tank.
https://www.korallenriff.de/en/article/1925_5_Jump_Protection_Solutions_for_Fish_in_the_Aquarium__5_Net_Covers.html
A small night light also helps, as it provides the fish with a means of orientation in the dark!
