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    1. Species/
    2. Crustaceans/
    3. Paguristes cadenati

    Crustaceans · Diogenidae

    Paguristes cadenati

    Scarlet reef hermit crab

    Bright red, yellow-eyed hermit crab from Caribbean and Gulf of Mexico reefs. Prized in reef tanks for eating filamentous and slime algae and cyanobacteria; peaceful, it still needs empty shells available.

    • beginner level
    • Reef Safe
    Adult size
    ≤ 3 cm

    This sheet is still being written. Some sections are not filled in yet: they stay hidden while they are empty.

    On this sheet

    1. Water parameters
    2. Care and feeding
    3. Compatibility
    4. Description
    5. Conservation
    6. Classification
    7. Sources

    What it needs

    Water parameters

    • Temperature°C
      2230
      22.2–25.6 °C
    • SalinitySG
      1.021.03
      1.023–1.025 SG
    • pH

    Related species

    Other crustaceans

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    Left-handed hermit crab

    Calcinus laevimanus

    C

    Electric blue hermit crab

    7.6
    8.6
    8.1–8.4
  1. Alkalinity (KH)dKH
    513
    8–12 dKH
  2. Range recommended by the sheet

    Day to day

    Care and feeding

    • LevelBeginner
    • FoodDetritivore

    Care

    Acclimation: drip-acclimate it (one to two drops per second) until the salinity in the bucket matches the tank.

    Shells: it changes shells as it grows; leave several empty shells of various sizes. Like any hermit crab, if it finds no shell or is hungry it may kill a snail to take its shell; a moulting crab with no spare shell is very vulnerable.

    Aquascape: an established tank with plenty of rock, cracks and caves to graze. Easy to keep and peaceful, it suits beginners and reef tanks rich in invertebrates.

    Sensitivities: it does not tolerate copper treatments. Water: 22 to 25.5 °C, specific gravity 1.023 to 1.025, pH 8.1 to 8.4, alkalinity 8 to 12 dKH.

    Feeding

    In the wild it is a scavenger feeding on animal and plant detritus.

    In the aquarium it eats filamentous algae, slime algae and cyanobacteria, as well as detritus. If algae run short, add algae wafers; it also accepts frozen and flake food. Do not leave excess to rot in the tank.

    Decor

    • Empty shells of various sizes
    • Rockwork with cracks and caves to graze

    Tank mates

    Compatibility

    Goes well with

    • ✓Invertebrate-rich reef tank: considered suitable
    • ✓Peaceful fish and corals

    Avoid

    • ✕Snails, if the tank lacks empty shells: it may kill them for their shells
    • ✕Copper-based treatments

    In detail

    Description

    Identification: red body and antennae, long yellow to orange eyestalks, yellow-green corneas; smooth hairless legs and claws, the left claw slightly larger than the right. It measures about 3 cm (Quality Marine lists up to 3.8 cm). It resembles the orange-claw hermit (Calcinus tibicen), which is usually darker with white patches near the leg tips.

    In the wild it lives on coral reefs of southern Florida, the West Indies, the Caribbean and the Gulf of Mexico, from the intertidal zone down to about 80 m. It is a scavenger of animal and plant detritus. After settling, juveniles must find an empty shell of the right size, often from the genera Cerithium and Vasum.

    Reproduction: the sexes are separate and breeding takes place all year; the orange eggs hatch into planktonic larvae that later settle on the bottom. No source consulted describes captive breeding.

    Status: the species has not been evaluated by the IUCN and is not listed by CITES.

    Characteristics

    • Bright red body, yellow eyestalks.
    • Smooth legs and claws; left claw slightly larger.
    • About 3 cm.
    • Eats filamentous algae, slime algae and cyanobacteria.
    • From the intertidal zone down to about 80 m in the wild.
    • Needs spare empty shells.

    Origin

    • Tropical western Atlantic

    Distribution

    • Gulf of Mexico and Caribbean Sea, from southern Florida to the West Indies
    • From the intertidal zone to about 80 m

    Status

    Conservation

    IUCN Red List

    Not evaluated (NE)

    WoRMS

    Classification

    Kingdom
    Animalia
    └
    Phylum
    Arthropoda
    └
    Class
    Malacostraca
    └
    Order
    Decapoda
    └
    Family
    Diogenidae
    └
    Genus
    Paguristes
    └
    Species
    Paguristes cadenati

    AphiaID 368215 · See on WoRMS (opens in a new tab)

    Where this comes from

    Sources

    1. [1]WoRMSWoRMS — Paguristes cadenati Forest, 1954 (AphiaID 368215) (opens in a new tab) · accessed on November 11, 2026
    2. [2]WebGBIF — vernacular names of Paguristes cadenati (Catalogue of Life, ITIS) (opens in a new tab) · accessed on November 11, 2026
    3. [3]WebSeaLifeBase — Paguristes cadenati (species summary) (opens in a new tab) · accessed on November 11, 2026
    4. [4]WebGBIF — IUCN Red List category of Paguristes cadenati (Not Evaluated) (opens in a new tab) · accessed on November 11, 2026
    5. [5]CITESSpecies+ — search for Paguristes (no CITES taxon concept for Paguristes cadenati) (opens in a new tab) · accessed on November 11, 2026
    6. [6]WebWikipedia (en) — Paguristes cadenati (description, range, reproduction, aquarium) (opens in a new tab) · accessed on November 11, 2026
    7. [7]WebQuality Marine — Scarlet Reef Hermit Crab (Paguristes sp.; the catalogue lists P. cadenati under item 52518) (care data) (opens in a new tab) · accessed on November 11, 2026
    8. [8]WebThat Fish Place / That Pet Place — Hermit Crabs (care article: shells, snails, diet, molting) (opens in a new tab) · accessed on November 11, 2026
    9. [9]WebQuality Marine — How to 'Drip Acclimation' (opens in a new tab) · accessed on November 11, 2026
    UpdatedNov 11, 2026
    Versionv2
    Report an error on this sheet

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