Sphaeroma quadridentatum

Say, 1818

sea pill bug, Fourtooth Seapill

Sphaeroma quadridentatum is a marine isopod in the Sphaeromatidae, commonly known as the sea pill or Fourtooth Seapill. It inhabits coastal marine environments and has been studied in laboratory settings to document its reproductive and . The exhibits in molting patterns, with males undergoing terminal while females continue molting throughout life.

Sphaeroma quadridentatum by (c) Lexi Amico, some rights reserved (CC BY), uploaded by Lexi Amico. Used under a CC-BY license.

Pronunciation

How to pronounce Sphaeroma quadridentatum: /sfɛəˈroʊmə kwɑdrɪˈdɛntətəm/

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Habitat

Coastal marine environments. Specific microhabitat details are not well documented in available sources.

Distribution

Distribution records exist but specific geographic range details are not clearly supported in the provided sources. The has been documented in laboratory studies and has observations recorded in iNaturalist.

Life Cycle

Offspring cultured to maturity in laboratory conditions required up to five months, with a 48% mortality rate. development is relatively lengthy compared to some related .

Behavior

Males exhibit terminal (ceasing molting after reaching maturity), while females continue to molt until death. Mature females alternate between reproductive and resting intermolt periods, with distinct oostegite morphologies characterizing each stage: small rounded oostegites in females, large overlapping oostegites in females, and small oostegites with arrow-shaped angled tips in resting females. Amplexus (mate-guarding ) precedes reproductive molts but is not required for . Copulation occurs during the interval between shedding of the and portions.

Human Relevance

Laboratory studies indicate the is not cost-effective for applications due to lengthy time to maturity (up to five months) and relatively high mortality (48%).

Similar Taxa

Exosphaeroma spp.Both are marine isopods in the Sphaeromatidae with pill-like body forms; Exosphaeroma are distinguished by specific morphological features and geographic distribution in the northeastern Pacific.