Sphaeromatidea

Wägele, 1989

Seapills and allies

Sphaeromatidea is a suborder of isopod established by Wägele in 1989, containing approximately 8587 recorded observations. The suborder comprises seven extant across two superfamilies: Seroloidea (including Serolidae, Basserolidae, Bathynataliidae, and Plakarthriidae) and Sphaeromatoidea (including Sphaeromatidae, Ancinidae, and Tecticipitidae), plus three extinct families. Members exhibit substantial morphological diversity, with some having colonized freshwater from marine ancestors.

Cassidinidea ovalis by no rights reserved, uploaded by nmacelko2. Used under a CC0 license.

Thermosphaeroma by (c) Kevin Anderson, some rights reserved (CC BY), uploaded by Kevin Anderson. Used under a CC-BY license.

Thermosphaeroma by (c) Jared Shorma, some rights reserved (CC BY), uploaded by Jared Shorma. Used under a CC-BY license.

Pronunciation

How to pronounce Sphaeromatidea: //ˌsfɛəroʊməˈtɪdiə//

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Habitat

range from fully marine to freshwater environments. Marine occur in coastal waters. Freshwater has been documented in karstic streams and cave systems at inland localities, as well as maritime freshwater streams and seeps. The suborder includes the first documented purely freshwater sphaeromatid isopod from an oceanic island, found at 390 m elevation and 23.5 km inland.

Distribution

Global distribution with documented occurrences in the southwestern Pacific Ocean (Vanuatu), New Zealand (North Island), and other coastal regions. Specific localities include Espíritu Santo Island (Vanuatu), Waitemata Estuary (Auckland), and the Wellington and Wairarapa regions.

More Details

Taxonomic composition

The suborder contains two superfamilies: Seroloidea ( Serolidae, Basserolidae, Bathynataliidae, Plakarthriidae) and Sphaeromatoidea (families Sphaeromatidae, Ancinidae, Tecticipitidae). Three extinct families are also recognized: Archaeoniscidae, Schweglerellidae, and Tricarinidae.

Freshwater colonization

Multiple independent freshwater events have occurred within Sphaeromatidea. Most freshwater appear to derive from the Exosphaeroma s.l. cluster, though phylogenetic relationships remain unresolved pending comprehensive revision.