Semionellus placidus

(Wood, 1864) · species

image placeholder — illustration coming later

Animalia/Arthropoda/Diplopoda/Polydesmida/Xystodesmidae/Semionellus

At a glance

Occurrence records136

Data sources7

Biological traits0

DNA specimens1

eDNA detections1

Sources7 archives

Databases and archives Semionellus placidus's data was compiled from.

WikipediaWikimedia Foundation1 languages↗

GBIFGlobal Biodiversity Information Facility136 records↗

ENAEuropean Nucleotide Archive · EMBL-EBI1 eDNA detections↗

BOLD SystemsCentre for Biodiversity Genomics1 specimens↗

Open Tree of LifeOpenTreephylogeny backbone↗

Catalogue of LifeCOLtaxonomy↗

GLoBIGlobal Biotic Interactionsbiotic interactions↗

On this page4 sections

Every layer below draws on the sources above — open one to explore it, or use ← → to move between tabs.

NarrativeWikipediaarticle

Occurrence & distributionGBIF136 records

Environmental DNA1 datasets · 1 countries1 detections

DNA & barcodingBOLD1 specimens

01Narrative

Semionellus placidus is a species of flat-backed millipede in the family Xystodesmidae. It is found in North America.

No narrative description available for this taxon yet.

02Traits & measurements

No structured trait data for this taxon yet.

05DNA & barcoding1 specimens

A DNA barcode is a short, standardised stretch of genes that works like a fingerprint — enough to tell one species from another. Below is the molecular trace Semionellus placidus has left across the world's sequence archives.

At a glance

DNA specimens1

BINs1

Marker genes1

eDNA detections1

Countries1

Marker genes sequenced

★ the standard DNA barcode for this group — the short region actually read to tell this species apart. The rest are extra genes sequenced along the way.

★COI-5P

animal barcode

08Occurrence & distribution

Record type136 records

Wild obs. + sensor117

Museum / vouchered19

Range

Area of Occupancy AOO300 km²

Wildobservation + sensor

Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.

Coordinate accuracy81% within 1 km

≤100 m 60≤1 km 21≤10 km 8>10 km 11

100 georeferenced · 17 without coordinates

Open the mapobservation + sensor117

Museum / Voucheredphysical evidence

Backed by a physical specimen — a herbarium sheet, sample or voucher held in a collection. “Vouchered” means supported by material evidence, not just an observation.

Coordinate accuracy0% within 1 km

≤10 km 1>10 km 1

2 georeferenced · 17 without coordinates

Open the institutions mapphysical evidence19

Wildobservation + sensor

Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.

10Collections & institutions

Holding institutions2 of 2 geolocated

Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.

Institution	Specimens
Blacksburg, US	16
Cambridge, US	2

2 institutions · 18 of 19 vouchered records shown · 1 without an institution code

09Environmental DNA1 detections

Where the DNA of Semionellus placidus was picked up in samples of water, soil or air — nobody saw the organism, only its DNA left behind. A trace is a clue that the species was near, not a confirmed sighting.

Signal

Detections DNA found1

Studies independent surveys1

Countries1

Signal confidence: weakweighed across independent studies, places & mapped detections

Where its DNA was found

0 of 1 detections have coordinates

Open the map1 country0

How strong is each trace?

DNA read depthRead counts were not reported for this species — the map shows presence only, not how strong each trace was.

Modelled climatemodelled

−15°Ctemperature across detection sites+40°C

Temperature median12.2 °C 12.2–12.2

Seasonal swing summer↔winter23.8 °C

Max temp (day)17.2 °C

Min temp (night)7.70 °C

Precipitation97.9 mm/mo

Air humidity58.9 %

Moisture balance12.9 mm/mo

Vapour deficit657 Pa

Wind speed2.40 m/s

Cloud cover42.7 %

CHELSA 1981–2010, ~9 km grid, at location & month of 1 detection point · median with p10–p90 · reflects where sampling happened, not only the true niche

How to read this: each dot is one detection of this species' DNA in an environmental sample. The confidence meter weighs how many independent studies and places back up the signal — one detection in one study is a hint; many across several studies is solid. Records dated before 2008 (when eDNA methods began) are treated as likely mislabeled and left off the map.

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