Marine life  /  Shrimps  /  Simplex shrimp
Reviewed 2026-09-06
Species entry

Simplex shrimp

Phyllognathia simplex

The second Phyllognathia, banded like the tiger shrimp and not separable from it in a photograph.

Size
To 1.5 cm
Depth
5–25 m
Habitat
Rubble and sponge
Active
Night
Range
Indo-Pacific
Rarity
Lembeh Strait
4 stars of 5, two or three a season
Simplex shrimp, Phyllognathia simplex

Small, to about 1.5 cm, white to cream with bold dark transverse bands and orange-red highlights, on rubble and sponge at night. It is the second of the two Phyllognathia in this region and it looks like the first: the same flattened, expanded second chelipeds, the same leaf-like antennules, the same banding.

The two are separated on the spines of the carapace and rostrum and on the eyestalk, and no character that separates them has been published in a form a photograph can be read against. So a shrimp of this kind photographed here is Phyllognathia unless somebody who has examined it says otherwise. The records on this page are named simplex on the identification of the diver who took the pictures, and that is the whole basis for them.

Nocturnal and cryptic on rocky and rubble reef, usually found as a male-female pair, and like the tiger shrimp it takes brittle stars rather than sea stars. Recorded across the same range as its congener, from the Maldives east through Indonesia and the Philippines.

Where to find:

LocationRarity Best monthsDepthHabitat
Lembeh Strait Indonesia editorial estimate
4 stars of 5, two or three a season
Year-round
5–25 m
Rubble and sponge
Anilao Philippines editorial estimate
4 stars of 5, two or three a season
Year-round
5–25 m
Rubble

Ratings are per location: 1 means found on most dives that look for it, 5 means a handful of records. Where enough dives have been logged the figure is calculated from them; otherwise it is an editorial estimate, and says so. We publish habitat and destination, not the dive site.

Related species

SP
banded coral shrimp
16:10
Banded coral shrimp
Stenopus hispidus
SP
bivalve shrimp
16:10
Bivalve shrimp
Conchodytes
SP
blue boxer shrimp
16:10
Blue boxer shrimp
Stenopus tenuirostris
SP
bubble coral shrimp
16:10
Bubble coral shrimp
Palaemonella philippinensis