. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. VELUM OF OSTREA CH1LENSIS 107. Figure 4. Ciliature of Ihe laic pedivcliger of Ostreci chilensis. (A) Lateral view; scale bar 160 /urn. (B) Superior view of the velum showing the AC band in the center; scale bar 60 /xm. (C) Detail of the IPC band (superior aspect); scale bar jam. (D) Transverse section of the velum showing the principal ciliary bands; scale bar /xm. (E) Detail of the OPC band; scale bar /urn. Arrow indicates a row of cirri. (F) Lateral view of the mouth area, showing OPC and AOC bands; scale bar
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. VELUM OF OSTREA CH1LENSIS 107. Figure 4. Ciliature of Ihe laic pedivcliger of Ostreci chilensis. (A) Lateral view; scale bar 160 /urn. (B) Superior view of the velum showing the AC band in the center; scale bar 60 /xm. (C) Detail of the IPC band (superior aspect); scale bar jam. (D) Transverse section of the velum showing the principal ciliary bands; scale bar /xm. (E) Detail of the OPC band; scale bar /urn. Arrow indicates a row of cirri. (F) Lateral view of the mouth area, showing OPC and AOC bands; scale bar 40 jum. (G) Food groove: scale bar 22 jum. (H) Ventral (= frontal) view of the mouth region; scale bar 48 F = foot; for other abbreviations see legend to Fiaure 3. which are in contact with each other for almost all their length. The width of the cirrus is about 1 /xm. and each one is separated from its neighbor by a nonciliated space of about /xm. Atlornl cilia The remainder of the velum (adoral area), from the OPC to the dorsal margin of the shell, is covered by a carpet of individual, short cilia (8-12 /xm) known as the adoral cilia (AOC), which also cover the crest and floor of the food groove (the sides are not visible) and the external part of the mouth. No differentiation in the form of the AOC is appar- ent, although in some areas there are a few cilia of different length, and in the floor of the food groove the cilia are shorter than the rest of the AOC (Fig. 4F. G). Short cilia can also be seen on the base of the external part of the mouth (Fig. 4H). There is no clearly identifiable postoral ciliary band of the type identified in larvae of Ostrea edulis by Waller (1981). Below the food groove and close to the mouth lie several lobes, which resemble the tumescent cells identified by Waller (1981) in O. editlix. Discussion The inclusion of a pelagic larva in the life cycle of most marine bivalve molluscs is accompanied by anatomical adaptations, especially t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
