Larvacea

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Related to larvaceans: appendicularia

Larvacea

[lär′vā·shē·ə]
(invertebrate zoology)
A class of the subphylum Tunicata consisting of minute planktonic animals in which the tail, with dorsal nerve cord and notochord, persists throughout life.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Attachment and feeding of pelagic copepods on larvacean houses.
Midwater zooplankton communities on pelagic detritus (giant larvacean houses) in Monterey Bay, California.
Also imaged were a variety of invertebrate plankters, ranging from copepods and larvaceans to ctenophores and medusae to invertebrate larval types, such as echinoderm pluteus.
Larvaceans drift in the sea in numbers almost too great to imagine.
Of the small and medium POP sampled at the north and south sites in August, there were no significant differences by numerical or weight proportions in the three main prey items consumed: large copepods, euphausiids, and larvaceans (P > 0.05).
Using relatively crude equipment, he measured the average transparency of various dinoflagellates, siphonophores, copepods, and larvaceans and presented a model, which, unfortunately, was inaccurate, relating the measurements to sighting distance.
and the larvacean Fritillaria borealis (Lohmann 1896) represented 60-80% of the zooplankton by number, based on samples from bongo nets.
B Sample Area (n) amphipod Chiniak Bay 4 t Ugak Bay 1 t Kiliuda Bay 2 t Shelf 4 t Zooplankton (number of individuals/ [m.sup.3]) (1) crab Area chaetognath copepod larvae euphausiid Chiniak Bay 9 332 1 23 Ugak Bay 13 12 48 2 Kiliuda Bay 13 40 82 28 Shelf 1 51 1 4 Zooplankton (number of individuals/ [m.sup.3]) (1) fish shrimp Area larva larvacean mysid larvae Chiniak Bay t 4 2 4 Ugak Bay t 3 1 t Kiliuda Bay t 17 4 3 Shelf t 15 t 2 total no./ Area [m.sup.3] Chiniak Bay 375 Ugak Bay 80 Kiliuda Bay 188 Shelf 74 (1) 0<t<0.05.
Among other taxa present in both seasons, density and percent density of gastropods were similar between seasons, but larvaceans were less available in summer than in autumn.
Brachyury (T) expression in embryos of a larvacean urochordate, Oikopleura dioica, and the ancestral role of T.