Sphaeromatidae

Latreille, 1825

seapills, Typical Seapills

Genus Guides

7

Sphaeromatidae is a of marine isopods commonly known as seapills, containing approximately 100 and 619 marine with about 65 additional species in freshwater. Members are frequently encountered on rocky shores and in shelf waters of temperate zones. Many species exhibit dorsoventrally compressed body shapes, often with vaulted dorsums, though some are strongly flattened and -like. The family includes both free-living and symbiotic forms, with some genera associating with sponges or other marine organisms.

Sphaeroma by (c) Saryu Mae 前 朝琉, some rights reserved (CC BY), uploaded by Saryu Mae 前 朝琉. Used under a CC-BY license.Gnorimosphaeroma oregonense by no rights reserved, uploaded by Braden J. Judson. Used under a CC0 license.Gnorimosphaeroma oregonense by (c) Erin McKittrick, some rights reserved (CC BY), uploaded by Erin McKittrick. Used under a CC-BY license.

Pronunciation

How to pronounce Sphaeromatidae: /sfɛəˌroʊməˈtaɪdiː/

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Habitat

Rocky shores and shelf waters in temperate zones; intertidal zones including mussel and barnacle zones; some inhabit sandy beaches, algal , sponge oscula, dead barnacle shells, coral cavities, and rock crevices. Some freshwater species occur.

Distribution

Worldwide in marine environments, with records from temperate zones of the North Atlantic (Denmark, Norway, Sweden), northeastern Pacific, New Zealand, Japan, and the Yucatan Peninsula. Present in both coastal and shelf waters.

Diet

Browsers or detritus feeders. Some have specialized feeding modes: Xynosphaera colemani burrows into alcyonacean coral tissue; general detritivory and browsing on organic matter appears common.

Host Associations

  • sponges - Particularly associated with Oxinasphaera
  • alcyonacean corals - /feedingXynosphaera colemani burrows into coral tissue
  • algae - Juveniles of some live on or amongst
  • molluscs - Juveniles sometimes associated with chitons, limpets, and whelks
  • demosponges - inhabit oscula of demosponges

Life Cycle

Biphasic observed in at least some : juveniles live on algal cover or in spaces between molluscs and rock surfaces; occupy cryptic and breed in polygynous groups.

Behavior

in armature present in some ; males may possess elongate pleonal processes or horns and large uropods. Adults often maintain -down position in cryptic . Some species form polygynous breeding groups with single males and multiple cohabiting females.

Ecological Role

and browsers in intertidal and shallow marine ; serve as prey for other organisms; some function as associates or of sponges and corals.

Human Relevance

Source of new discoveries in urban environments (e.g., Exosphaeroma pentcheffi discovered at Port of Los Angeles); some species may be useful indicators of marine quality.

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Sources and further reading