Halophila baillonis

Classification (WoRMS)

Full classification as recorded by WoRMS: Kingdom: Plantae · Phylum: Tracheophyta · Class: Magnoliopsida · Order: Alismatales · Family: Hydrocharitaceae · Genus: Halophila.

Accepted name: Halophila baillonis · Authority: Ascherson, 1874 · Taxonomic status: accepted · AphiaID: 374721.

Source: World Register of Marine Species (WoRMS) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=374721 (CC BY 4.0). Accessed 2026-09-25.

Biology and life history (SeaLifeBase)

Measured values published by SeaLifeBase for Halophila baillonis. Only fields the database actually holds for this species are shown; these are database values, not aquarium guidance.

Depth range: 3–10 m · Habitat zone: sessile · Aquarium trade: never/rarely.

SeaLifeBase notes: Subtidal, between depths of 3 to 10 m; on sandy bottoms (Ref. 83909).

Source: SeaLifeBase species summary (SpecCode 141801) — https://www.sealifebase.se/summary/Halophila-baillonis.html (CC BY-NC 3.0 — non-commercial use only). Accessed 2026-09-25.

Distribution and occurrence records (GBIF)

38 georeferenced occurrence records for Halophila baillonis are published through GBIF from 8 countries or marine areas. The map above plots 9 distinct locations from a sample of 38 records, omitting 2 inland records that carry an institution's coordinates rather than a collection site; it shows where the species has been observed and reported, not a modelled range.

Most records by country or area: Guadeloupe (24); Martinique (7); Trinidad and Tobago (2); Belize (1); Costa Rica (1); Cuba (1); Panama (1); United States of America (1).

Source: GBIF Occurrence Search (taxonKey 9179530) — https://www.gbif.org/occurrence/search?taxon_key=9179530&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=374721 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-25.

Description and natural history (Wikipedia)

This seagrass has fragile rhizomes with a single stem and a single root at each node. The shoots are erect and up to 24 mm long, each with two obovate, keeled, scales in the central portion and a pseudo-whirl of four leaves at the tip. The leaf-blades are oblong to lanceolate, 7 to 12 mm long by 3 to 4 mm wide, with pronounced midribs and fine marginal serrations. There may be as many as 2,500 shoots per square metre.

Distribution and habitat

Clover grass is native to the Caribbean area. It is known from several sites in the Greater Antilles, Lesser Antilles, Colombia, Venezuela and Belize, but its distribution is very patchy.

It was previously known from Guanacaste Province on the Pacific coast of Costa Rica, but has not been seen there since a severe storm in 1996 and is not known from elsewhere in the Pacific. It grows on sandy or muddy bottoms and its depth range is down to about 15 m. In 2015 it was found on the coast of Brazil in the state of Paraíba on a sheltered bar at the mouth of the Mamanguape River.

Ecology

Where it is plentiful, as in Belize, it is sometimes found growing among the prop roots of mangroves, intermingled with Thalassia testudinum, Halophila decipiens, Halodule wrightii and Caulerpa spp.. It provides food for the West Indian manatee and concealment for young nurse sharks. The scorched mussel lives in the seagrass meadows and fish such as the flag-fin mojarra and the permit feed on the mussels and consume the seagrass while doing so.

Status

This is a rare species of sea grass with a very fragmented distribution. Its greatest abundance is in the Placencia Lagoon in Belize, where it grows in dense monospecific stands.

In several places, such as in Colombia and Puerto Rico, its presence has been confirmed in the past but it has not been found recently. Its total population seems to be in decline; its total area of occupancy is about 2000 km2 and it is known from about seven locations. For these reasons, the International Union for Conservation of Nature has assessed its conservation status as being "vulnerable".

Source: Wikipedia: Halophila baillonis — https://en.wikipedia.org/wiki/Halophila_baillonis (CC BY-SA 4.0). Accessed 2026-09-25.