Little Sea Isopods (Cubaris murina)

Look down the Cubaris on this site and nearly every one is a Cubaris sp. - an animal the science has not formally named yet, sold under a hobby label someone coined. The Little Sea is the exception. It is Cubaris murina, a formally described species, the animal the genus itself is built around, and the one that gave every rubber ducky and panda king its reputation for being worth the trouble.

Introduction

This is the wild-type of the genus, traded as the Little Sea, the Little Sea Isopod, the Sea Pillbug or simply Cubaris murina, and the common name comes from the smooth, domed shell, which looks enough like a small marine creature to have fooled people for a long time. Unlike the cave specialists that dominate the premium end of the hobby, murina has spread across the warm regions of the world and turns up on several continents, and that adaptability is exactly what makes it the sensible first Cubaris. Its own colour morphs have gone on to become popular animals in their own right, among them the pink Marina Papaya and the all-white Murina Glacier.

Appearance

Around a centimetre long, smooth-shelled and neatly domed, in muted greys and browns that occasionally lean purple, with a small flush of pink or peach at the tail end that is the easiest way to recognise them. They will not compete across a room with a designer morph, and they are not trying to: the appeal is in the shape and the detail up close, that armoured, helmeted profile in miniature. Disturb one and it draws itself into a closed ball and waits you out.

Care

Easy, by Cubaris standards, and forgiving in a way the cave species are not. Keep the enclosure warm and humid with moderate ventilation, damp throughout rather than bone dry anywhere, and let one corner sit a little wetter as a retreat. A heated UK room covers most of the year, with a thermostat-controlled mat on the side of the tub through the colder months. Give them depth to burrow into and a substrate that feeds them as it breaks down: flake soil, white-rotted hardwood and organic topsoil, with crushed limestone mixed right through, because calcium is the one thing a Cubaris cannot moult without. One change worth making if you are working from older advice: do not build the base around coconut coir. It holds water beautifully and feeds nothing, and a substrate that cannot be eaten is a wasted layer. Pack hardwood leaf litter over the top, add cork bark and a few hides, and leave them to it. Our substrate guide and calcium guide cover the specifics.

Diet

Leaf litter and decaying hardwood are the staples and should never run out. On top of that, vegetables such as carrot, courgette, squash or sweet potato once or twice a week, and protein - fish flake, dried daphnia, shrimp - at a similar rate, since a breeding colony leans on it. Lift whatever is left after a day or two. One honest warning for planted setups: Little Seas will have a go at soft live plants, ferns especially, so pick robust species or keep them in a litter-based enclosure. A springtail culture underneath them deals with the mould that humid enclosures inevitably grow.

Breeding

Reliable, which is the whole point of this species. Where a premium Cubaris can sit for the best part of a year doing nothing while you second-guess your husbandry, a Little Sea colony settles within a month or two and then produces steadily and year-round given stable warmth, humidity and calcium. Growth is consistent rather than explosive. If you can run a Little Sea colony well, you have the husbandry for anything else in the genus, which is precisely why so many keepers start here.

Who is this for?

Anyone who wants into Cubaris without gambling a lot of money on a species that might sulk. It is the standard recommendation as a first Cubaris, it teaches you the genus from the ground up, and the skills carry straight over to the Panda King or our best-selling Rubber Ducky when you are ready. It is also a genuinely good tropical clean-up crew for dart frog and gecko bioactives. The one keeper it will not satisfy is the one who wants colour and drama, because this is a subtle animal that rewards a closer look. The rest of the genus sits in our Cubaris collection.

Little Seas ship as captive-bred UK stock under our live arrival guarantee, packed with sphagnum moss into a ventilated deli tub and boxed behind a double wall. We post Monday to Thursday, which keeps every order clear of the weekend backlog.