Tubulophilinopsis lineolata is very cosmopolitan within Australia and this has been known for 40 years. It occurs naturally in every Australian state (except Tasmania) as well as (northern) New Zealand. The larvae are likely long-lived and they settle and grow wherever conditions are suitable and the water is warm enough. On the other hand, long periods can go by with no sightings.

• Habitat: Soft sediment

• IUCN Threat Status: Vulnerable
• Occurrence: Rare (1% of sites)
  Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed
• Abundance: Few (2 per transect)
  Abundance is calculated as the average number of individuals recorded per RLS transect, where present.