Chaetiliidae

Dana, 1849

Chaetiliidae is a of marine isopod in the suborder Valvifera. The family includes approximately 12 , ranging from small estuarine to the Antarctic giant isopod Glyptonotus antarcticus. Members occupy diverse from shallow coastal waters to deep Antarctic seas. Some species exhibit complex biology with maternal care and sibling .

Saduria by (c) Георгий Виноградов (Georgy Vinogradov), some rights reserved (CC BY), uploaded by Георгий Виноградов (Georgy Vinogradov). Used under a CC-BY license.

Saduria by (c) Jason Grant, some rights reserved (CC BY), uploaded by Jason Grant. Used under a CC-BY license.

Saduria by no rights reserved, uploaded by Nicolás Tamargo. Used under a CC0 license.

Pronunciation

How to pronounce Chaetiliidae: //kaɪˈtɪl.i.aɪdiː//

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Habitat

Marine and estuarine environments. Saduriella losadai occurs in river estuaries at the mesohaline-oligohaline boundary, preferring sandy sediments. Glyptonotus antarcticus inhabits Antarctic marine environments.

Distribution

Widespread in marine environments. Saduriella losadai recorded from Minho River estuary, northwestern Iberian Peninsula. Glyptonotus antarcticus recorded from Antarctica, including Signy Island and South Orkney Islands. Distribution records from Denmark and Norway (GBIF).

Seasonality

Saduriella losadai shows recruitment peaks in spring-summer. Juvenile to freshwater occur in late spring and summer; migrations to lower estuary occur in autumn. Mature migrate back in winter before reproductive season.

Life Cycle

Glyptonotus antarcticus exhibits prolonged incubation with slow development. Marsupial occurs in a modified brood pouch. Developing young receive nutrition via adelphophagy (sibling ) and maternal secretion. Saduriella losadai shows two recruitment peaks annually.

Behavior

Saduriella losadai uses tidal drift during flood tides for . migrate to freshwater environments and back to lower estuary seasonally. Glyptonotus antarcticus exhibits adelphophagy during incubation as a nutritional strategy.

More Details

Brood pouch morphology

Glyptonotus antarcticus possesses a marsupium with characteristics deviating from the typical Idotea- marine isopod pouch, with some features resembling the Porcellio-type of terrestrial isopods.

Population trends

Saduriella losadai showed a sharp decline in abundance in the Minho River estuary compared with data from 40 years prior, though further study is needed to confirm this trend.

Epizoic associations

Two unidentified epizoic (a turbellarian flatworm and a fish leech) have been observed on Glyptonotus antarcticus in the vicinity of the marsupium.