How to Identify Pacific Spiny Lumpsucker

To identify Pacific Spiny Lumpsucker (Eumicrotremus orbis), look at these key features.

Physical Characteristics

Body shape

rounded

Coloration

Highly variable, ranging from red, orange, yellow, green, to brown, often mottled or patterned. Coloration can change to match the substrate, providing excellent camouflage.

Scale type

none

Mouth position

superior

Distinctive features

Globular, almost spherical body shape, Body covered in numerous prominent, conical, bony tubercles (spines), Large, upward-pointing eyes, Prominent ventral suction disc formed by modified pelvic fins, Small, upturned mouth

Dorsal fin

Two dorsal fins; the first is typically low and often obscured by tubercles, the second is soft-rayed and relatively small.

Tail fin

Small, rounded caudal fin.

Pectoral fin

Large, fan-like pectoral fins.

Distinctive fins

Pelvic fins are modified into a large, powerful ventral suction disc.

Identification Tips

1. 1

   Body Shape and Tubercles

   Look for a distinctly globular, almost spherical body covered in numerous, prominent, conical, bony spines or tubercles. This is the most defining characteristic.

2. 2

   Suction Disc

   Observe the large, circular suction disc on its underside, which it uses to attach to surfaces. This is a key feature of all lumpsuckers.

3. 3

   Mouth and Eyes

   Note the small, upturned mouth and relatively large, upward-pointing eyes.

4. 4

   Coloration

   While variable, the mottled or patterned coloration helps it blend with its surroundings. Look for colors like red, orange, yellow, green, or brown.

5. 5

   Habitat

   Found in cold, rocky, shallow marine waters, often clinging to rocks or kelp.

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