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Species · accepted · checked 2026-08-05

Haliphron atlanticus

Seven-arm octopus

WoRMS 341781ITIS 205738GBIF 2289216key worms:341781
i

2026-08-05: itis_id 205738 via WoRMS external link

Silhouette · T. Michael Keesey · Public Domain Mark · PhyloPic, drawn from Haliphron atlanticus
Seven-arm octopus10 cm
US quarter2.4 cm

max · sealifebase

Photograph of Haliphron atlanticus
Photo · Alvaro Jaramillo · CC BY-NC 4.0 · inat NC

The seven-arm octopus, also known as the blob octopus or sometimes called septopus, is one of the two largest known species of octopus; the largest specimen ever discovered had an estimated total length of 3.5 m (11 ft) and mass of 75 kg (165 lb).W CalCOFI holds 1 observations of it in 1 dataset between 2010 and 2010, as invert.R

1
observations
1
records
1
sampling events
2010
years
1
datasets
invert
life stages

Observed in
i

One row per dataset, one cell per year, darker with more observations — the same strip the front door draws per dataset. Each row ends with the name that dataset uses (dataset_taxon); the accepted name is written once, in the title above. A quiet pill marks a name the authority does not accept.

  • Ichthyoplankton 1 obs · 1 events · 2010 · invert
    name used: Haliphron atlanticus · code 9820

How big is it
i

Every mark is a measured length with its own source — hover one to read it. The reference objects are _data/size_reference.csv: two of them, the 505 µm bongo mesh and the net's ring, are CalCOFI's own sampling gear.

Ways in
i

Read from taxa.json of release v2026.09.11, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.

Explorerdb-query
ERDDAPCalCOFI's own server, the Ichthyoplankton table constrained to this taxon
https://erddap.calcofi.io/erddap/tabledap/swfsc_ichthyo.html?&taxon_key=%22worms:341781%22