Not assigned |
Not assigned |
Trichoplacidae
Environment: milieu / climate zone / εύρος βάθους / distribution range
Οικολογία
. Tropical
Circumglobal.
Length at first maturity / Μέγεθος / Weight / Age
Γεννητική Ωρίμανση: Lm ? range ? - ? cm
Flat (up to 0.5mm in its longest dimension), multicellular, amorphous, mobile flagellated animal lacking body cavity, digestive and nervous systems, composed of 2 layers of epithelial cells. Associated glandular cells apparently secrete digestive enzymes beneath the animal as it sits atop the algae and protozoans on which it apparently feeds; digestion seems to be entirely extracellular , as there is no mouth and no sign of phagocytosis. The much thinner, upper layer of the animal bears flagellated cells, but no gland cells. In a sense, the upper layer is ectodermal, while the lower layer, because of its involvement in digesting food and absorbing nutrients, is endodermal. Between the upper and lower cell layers is a fluid-filled space containing a dense network of fibrous cells that may be contractile (Ref. 53).
Commonly found in warm marine environments (Ref. 57) and in marine aquaria (Ref. 59), on hard bottom substrates in the benthic regions (Ref. 53). A scavenger which feeds on dead animals with its ventral surface, which produces digestive enzymes (Ref. 53), and also feeds on Cryptomonas (Ref. 57 and 60) and algae (Ref. 59); often, individuals contract part of the ventral surface into a sac where digestion may take place more efficiently (Ref. 60).
Life cycle and mating behavior
Γεννητική Ωρίμανση | Αναπαραγωγή | Γεννοβολία | Eggs | Γονιμότητα | Larvae
Reproduces asexually, binary fission, budding (Ref. 60), fragmentation (Ref. 53). Older cultures at high density begin to produce small motile presumptive sperm cells, and as individual animals disintegrate, they spew out ova (Refs. 59, 61).
Collins, A.G. 2000 Intoduction to Placozoa. Tree of Life Web Project. http://www.ucmp.berkeley.edu/phyla/placozoa/placozoa.html (Αναφ. 60)
IUCN Red List Status
(Αναφ. 130435: Version 2025-1)
CITES status (Αναφ. 108899)
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
| FishSource |
Εργαλεία
Περισσότερες πληροφορίες
Population dynamicsΑύξηση
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
Αφθονία
Life cycleΑναπαραγωγήΓεννητική ΩρίμανσηΓονιμότηταΓεννοβολίαEggsEgg developmentLarvae PhysiologyΚατανάλωση οξυγόνου
Human RelatedStamps, coins, misc.
Διαδικτυακές πηγές
Estimates based on models
Price category
Unknown.
