apical plate

apical plate

[′ap·i·kəl ′plāt]
(invertebrate zoology)
A group of cells at the anterior end of certain trochophore larvae; believed to have nervous and sensory functions.
Mentioned in ?
References in periodicals archive ?
We agree with Horiguchi & Pienaar (1991) in that Peridinium quinquecorne has only two intercalary plates, and that dorsal view observations have to be made carefully in order to prevent confusing the plate 2a with an apical plate, following Balech's (1980) criterion, that this plate does not touch the apical pore.
Peridinium gatunense Nygaard is spherical with no dorsoventral compression, has wide cingular lists and a small first apical plate.
Despite a more than a doubling of the original sample of regular echinoids and inclusion of data inferred from apical plate crystallography, the representation of different modes of development has not changed substantially.
The names of the thecal plates were abbreviated according to the Kofoid tabulation system as follows: first apical plate (1'), first intercalary plate (la), second intercalary plate (2a), first precingular plate (1"), and second pre-cingular plate (2").
Aedeagus with toothed apical plate most similar to burnsi, although plate not as elongate relative to medial portion of aedeagus to anterior.
In these embryos, unlike the embryos of regular echinoids, secondary mesenchyme cells did not seem to exert the force to pull up the archenteron toward the inner surface of the apical plate.
The names of the thecal plates are abbreviated according to the Kofoid tabulation system as follows: 1'--first apical plate, la--first intercalary plate, 2a--second intercalary plate, 3a--third intercalary plate, 1"'--first postcingular plate, S.
In fa ct, FMRFamide-LIR fibers also branched repeatedly under the apical plate in early embryonic stages of L.
It was about 8 [micro]m long and slightly curved, enclosed by the plate 2' and also touched apical plates 1', and 3'.
Preserved 1- and 2-day-old juveniles were dehydrated through an ethanol series and cleared in a solution of benzyl alcohol and benzyl benzoate to observe the apical plates.