SKU: 73197262307

Porcellio Silvestri High Orange Isopods

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Description

Porcellio Silvestri High Orange IsopodsPorcellio silvestrii 'High Orange' is the selectively bred orange colour line of one of the more biologically interesting Iberian Porcellio in the hobby a Spanish pine forest species that exhibits genuine sexual dimorphism in colouration, with adult males showing vibrant bright orange and adult females expressing the same orange in duller form or with grey tones. The 'High Orange' designation refers to the line bred to intensify the bright orange

Porcellio silvestrii 'High Orange' is the selectively-bred orange colour line of one of the more biologically interesting Iberian Porcellio in the hobby — a Spanish pine-forest species that exhibits genuine sexual dimorphism in colouration, with adult males showing vibrant bright orange and adult females expressing the same orange in duller form or with grey tones. The 'High Orange' designation refers to the line bred to intensify the bright orange expression — properly distinctive among Porcellio, where most species show essentially identical colouration across sexes.

This is the orange sibling listing to our dark Porcellio silvestrii 'Black Senia' — same species, opposite colour direction. Together they showcase the genetic range of P. silvestrii: black on one end, intensified orange on the other. Properly satisfying as a paired collection for keepers building a species-themed Iberian cluster.

Like all Porcellio, the High Orange does not conglobate — it curls partially when threatened rather than rolling into a complete ball. If you want a roller, look at other Porcellio won't suit; browse the full Porcellio collection for related species across the genus.

Quick Care Summary

Note: this listing's care icons couldn't be verified by direct page access. Care figures below reflect Exuvium and other authoritative sources for P. silvestrii; verify against the icons on the live product page before finalising your setup.

  • Scientific Name: Porcellio silvestrii Arcangeli, 1924
  • Colour Line: 'High Orange' — selectively bred for intensified orange expression
  • Common Name: Silvestri's Woodlouse (Orange line)
  • Family: Porcellionidae
  • Origin: Spain (Catalonia type locality; range extends across pine-forest habitats in northern and southern Spain)
  • Adult Size: Up to 25 mm — substantial mid-tier Porcellio
  • Lifespan: 2–3 years typical
  • Difficulty: Easy — among the more forgiving Iberian Porcellio
  • Temperature: 18–24°C (Mediterranean preference)
  • Humidity: 50–70% — drier-leaning with moisture gradient
  • Ventilation: Moderate to high — they require good airflow
  • Conglobation: No — curls partially when threatened
  • Appearance: Males show vibrant bright orange; females show duller orange with grey tones — properly distinctive sexual dimorphism in colour
  • Behaviour: Active day and night including early morning; shy initially; bold foragers once established
  • Breeding: Reliable — breeds true for the intensified orange expression with selective work
  • Rarity: Rare in the UK hobby

What Makes 'High Orange' Special

The sexual dimorphism is genuinely unusual. Porcellio silvestrii is one of relatively few terrestrial isopod species where males and females express noticeably different colouration. Most Porcellio (and most isopods generally) show essentially identical colour across sexes — only the body proportions and uropods differ. In P. silvestrii, adult males are vibrant bright orange while adult females are duller orange or grey-tinted. For naturalist customers, watching a colony develop and being able to identify sex by colour alone is properly interesting biology — much more accessible than the subtle morphological sex characters of most isopods.

The 'High Orange' selective work. This colour line represents intensification of the species's natural male orange expression, selectively bred over generations to produce stronger orange colouration in both sexes than the wild-type baseline. The result is a properly vivid display Porcellio with substantial visual impact.

The Filippo Silvestri provenance. Porcellio silvestrii was described by Aristide Arcangeli in 1924 in "Contributo alla conoscenza degli isopodi della Catalogna" — properly substantial 100-year-old scientific record from the Catalan fauna. The species name honours Filippo Silvestri (1873–1949), the major Italian entomologist who specialised in Protura, Thysanura, Diplura, and Isoptera, and who described the previously unknown order Zoraptera. Multiple species across different invertebrate groups bear his name.

The complementary cluster with Black Senia. P. silvestrii shows extraordinary colour range — from the dark Black Senia locality form through the bright orange of this 'High Orange' selected line. Keeping both gives you the genetic spectrum of a single species across two visually distinct lines.

Spanish pine-forest origin. P. silvestrii is native to Spanish pine forests with the moderate humidity and warm temperatures typical of Mediterranean coniferous habitat. This translates well to UK indoor husbandry — comfortably room-temperature, broadly tolerant of humidity variation, and active during daylight hours as well as at night.

Active and visible. Unlike many premium Porcellio that spend most of their time hidden, P. silvestrii are notably active across day, evening, and early morning hours. The bright orange males in particular are properly visible when foraging — substantial display value for a Porcellio at this price point.

For background on the genus and how the various Porcellio species compare, see our Different Types of Porcellio Isopods guide.

Setting Up the Enclosure

A 6–10 litre plastic container with a secure clip-lock lid suits a starter colony of 5–10 individuals. Drill ventilation holes on opposite sides for cross-ventilation, covered with fine mesh. P. silvestrii specifically need good airflow — this isn't a "stagnant humid" species. Aim for moderate to high ventilation.

Provide multiple hiding spots — cork bark flats, decaying wood, flat stones, ceramic hides. The orange colouration shows particularly well against dark naturalistic substrate and weathered cork bark. Keep the enclosure out of direct sunlight.

Important husbandry note: Porcellio do not need a standing water dish. Misting one corner of the enclosure provides all the moisture they need — open water risks drowning and is unnecessary for a Mediterranean drier-leaning species. Skip the water dish.

Substrate

Use a moisture-retentive substrate that drains well, reflecting the Spanish pine-forest origin:

  • Organic topsoil base (pesticide-free) as the foundation
  • Sphagnum moss for the moist section (keep one third of the enclosure consistently damp using moss; this matches Exuvium's confirmed husbandry approach for the species)
  • Composted hardwood leaf litter (oak, beech, maple)
  • Flake soil mixed in for added nutrition
  • Crushed limestone or eggshells distributed throughout for calcium
  • Pieces of rotting white wood (specifically recommended for this species)

We recommend a topsoil and sphagnum-based mix rather than coco coir. Substrate depth around 5–8 cm allows natural burrowing while supporting moisture-gradient stability.

Top layer: generous hardwood leaf litter plus rotting white wood pieces — both are specifically appreciated by P. silvestrii. Plus cork bark hides for cover.

Humidity and Temperature

Maintain humidity around 50–70% with a clear moisture gradient — keep one-third of the enclosure consistently damp using sphagnum moss while the rest stays drier with leaf litter coverage and good airflow. P. silvestrii is documented as not liking it too wet — properly drier-leaning Mediterranean species. Overwetting is more likely to cause issues than insufficient moisture.

Temperature should be 18–24°C — comfortably within UK room temperature year-round. They handle the cooler end of this range without difficulty and breeding picks up at 22–24°C. The species's pine-forest origin means they're adapted to seasonal temperate-Mediterranean variation rather than constant tropical conditions.

Diet

High Orange isopods are unfussy detritivores with broad appetites:

  • Hardwood leaf litter (oak, beech, magnolia) — the dietary foundation, always available
  • Rotting white wood — specifically recommended for this species; properly important nutrition source
  • Moss and decaying leaves — particularly relevant to the pine-forest origin
  • Vegetables 1–2x weekly: carrot, courgette, sweet potato, squash. Replace within 24–48 hours.
  • Fruit occasionally (small amounts of soft fruit)
  • Protein 1–2x weekly: fish flakes, dried shrimp, dried daphnia. Feed protein on the drier side of the enclosure to prevent spoilage.
  • Calcium (essential — always available): cuttlefish bone, crushed limestone, oyster shell, eggshells.

For dark and bright-coloured Porcellio lines including this orange-selected stock, oak leaf litter and white rotting wood seem to support pigmentation maintenance — keep both well stocked.

Breeding

High Orange breed reliably under stable conditions. The sexual dimorphism makes pairing properly straightforward: bright orange = male, duller orange/grey = female. Once mated, females develop a marsupium (brood pouch) and produce broods over the standard Porcellio cycle.

Colour breeding: The intensified orange expression is a selectively-bred trait. Pure 'High Orange' colonies breed true reliably, with selective work over generations strengthening the orange line further. Introducing wild-type or Black Senia individuals would dilute the orange expression — keep lines separate.

For breeding success:

  • Stable temperature in the warmer range (22–24°C is ideal for peak breeding)
  • Consistent moderate humidity with proper gradient — keep 1/3 moist, 2/3 drier
  • Abundant calcium for breeding females
  • Regular protein supplementation
  • Adequate hides and cover for gravid females
  • A larger starter group establishes faster and provides genetic diversity

Young inherit the orange line genetics from birth, with colouration intensifying through successive moults as juveniles mature toward adult sexual expression.

Who Should Buy 'High Orange' Isopods?

Ideal for:

  • Display keepers drawn to bright orange Porcellio with biological interest beyond pure aesthetics
  • Collectors building a P. silvestrii species cluster (High Orange + Black Senia — opposite colour expressions of the same species)
  • Naturalists interested in sexual dimorphism — properly unusual feature among terrestrial isopods
  • Keepers wanting a substantial Porcellio with manageable care (Easy difficulty by Iberian standards)
  • Anyone who appreciates honest taxonomic provenance (Arcangeli 1924, Catalonian type locality, Filippo Silvestri etymology)
  • Display setups with dark substrate where orange isopods stand out vividly

Not ideal for:

  • Keepers wanting a conglobating "rolling" isopod — Porcellio don't roll
  • Wet humid tropical setups — they prefer drier Mediterranean conditions
  • Customers wanting uniform-colour colonies — the natural dimorphism means males and females visibly differ
  • Beginner keepers without proper ventilation setup — good airflow is essential for this species

Realistic Expectations

The colour really is sexually dimorphic. Don't expect uniform vivid orange across the colony — adult males show the brightest orange; females are duller or grey-tinted. This is a species trait, not a defect, and it gives you instant visual sex identification.

They want ventilation. Probably the most common P. silvestrii failure mode is overly humid stagnant conditions — overwetting kills this species faster than underwetting. Good airflow is properly important.

They're shy initially but become bolder. Like most Porcellio, the High Orange spends much of its early time hidden but becomes a more confident forager as colonies establish. Adults are properly active across day and night once settled.

The "silvestrii" spelling has two i's. Named after Filippo Silvestri the Italian entomologist — the species name needs both i's to be taxonomically correct. Many retailer listings (often including the on-page title) drop one of the i's; the correct binomial is Porcellio silvestrii.

Pairing with Black Senia gives you the whole species story. The two lines represent opposite ends of the P. silvestrii colour spectrum — black on one extreme, intensified orange on the other. Genuinely satisfying as a paired collection.

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SKU: 73197262307

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Shianne Whipple
Phoenix, US
★★★★★ 5
Strong Omegaverse Comfort and a Attention Grabbing Plot
Format: Kindle
Jillian West never misses when it comes to Omegaverse, and Not Ready is no exception. This story was the perfect blend of cozy comfort and emotional depth while still delivering a strong plot. Vale is such a powerful heroine, she is strong, capable, and determined but I love that she still allows her pack to love and take care of her. It’s that balance of independence and vulnerability that makes her so relatable. The relationship dynamics were amazing: Bishop is steadfast and completely head over heels, Mercy is skeptical but protective in his own way, and Holt is the hesitant one whose slow fall is so satisfying to watch unfold. The romance hits that sweet spot between insta-love and cautious build, keeping me hooked the entire way through. And that ending. Oh my god, the cliffhanger! I need the next book in this duet immediately.
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Reviewed in the United States on August 28, 2025
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NLB
Houston, US
★★★★★ 5
Interesting
Format: Kindle
So I will say I enjoyed the story, for sure had its moments where it dragged but it was a great story. I really liked that omegas picked their alphas/make the pack. Normally the Alphas make it and the omega fits in with them which is great but I enjoyed this new version where all the power basically went to the omega. It was a nice change of pace. I can admit some of the weird bedroom stuff with her being pregnant was odd, it’s really not hard to do stuff when pregnant (I know I’ve had two and it’s normal and even encouraged at the end especially if you want the baby out). But I like the story as a whole and will read the second, I do hope the next one isn’t dragged bc it stopped being action or tense after she met her alphas and I don’t think it was brought up or properly done when they tried to do it. More sweet after she left.
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Reviewed in the United States on November 11, 2024
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Altairjones
Los Angeles, US
★★★★★ 3
I’m a little disappointed.
Format: Kindle
I usually like Jillian West’s books but this one was missing a lot for me. The pregnancy didn’t come across as real. She’s on her feet for 12 hour days but is perfectly healthy at 8 months pregnant? Yet the week she moves in all of a sudden she’s not? She is planning on actually running during one of the plot buildups. But at 8 months pregnant that’s incredibly hard to do. The lack of breathing ability and lung space, the change in body center, mass, and gravity. All of it prohibits running, unless you’re an athlete this didn’t come off as at all realistic. I didn’t feel any connection with the alphas. There wasn’t any emotional connection. It could be because of the tense it was written in. But I didn’t get any deep feelings out of this. It came across as checking off boxes. Even the spicy scenes weren’t really believable for me. I wanted to see them fall for her, and it just kind of all fizzled. Even Bishop. One thing I did really like was the ending. I did not see it coming and I’m interested in reading book two because of it. But on the whole this book was mostly disappointing for me.
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Reviewed in the United States on March 16, 2024
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Melissa Williams
Omaha, US
★★★★★ 4
4.25 stars
Format: Kindle
Vale is an 8 month pregnant omega working as a waitress at a strip club and a cam girl. She starts to get very creepy vibes from a regular at the club, and her baby daddy ghosted her. She has had an online relationship with a man named Bishop through her cam girl status. One night, bishop was paying to watch her sleep and ansthe creepy regular Andrew break in and watch her sleep he tells vale to come to him at his business now. She flees and finds herself at a large security company with some.hot of alphas who are there to help her. This imegaverse is a little different than I have read, but I am thoroughly enjoying it. Vale is not a traditional omega she was raised by a single beta mom, and the alphas are not normal alphas they have never really loved pack life. But they are ruthless mercenaries. They need her, and she needs them. I love the aspect of the stalker and now the plot twists at the end, so so good. Sometimes, it seemed a little slow and stale mated, but since this a duet, I think It was just her starting to have Vale get to know her alpha suitors. Cliffhanger for sure with this one.
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Reviewed in the United States on September 9, 2024
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Austin & Cambria
Pawtucket, US
★★★★★ 5
That ending 😫
Format: Kindle
I fell into a false sense of security and really thought this was gearing towards a happy ending. Then I realized there’s no work they don’t punish Andrew. I really liked Vale’s character. I don’t normally read books with pregnancy but going into this knowing she was pregnant made it more enjoyable for me. I loved Bishops devotion to her and her happiness. I also loved that Holt and Mercy couldn’t fight their attraction to her. I love scent matches so very much. I’m so curious to see how this duet will end up. And I need to pay more attention and notice that a book I’m starting is a duet to begin with lol
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Reviewed in the United States on February 21, 2025

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