. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTRAGONADAL DEVELOPMENT IN 19. Figure 2. Light microscopy (Fig. 2a, b. d-f. h)and confocal microscopy (Fig. 2c, g) of internal develop- ment of P vivipara (Fig. 2c, g) and P. parvivipara (Fig. 2a, b, d-f, h). Except in Fig. 2d, the larvae are orientated to facilitate presentation of right and left structures. Scale bars: Fig. 2a, b, d-f. h = 100 /jm; Fig. 2c, g = 50 /jm. (a) Gastrula with large archenteron (Ae) Bp, blastopore. O, oocyte. (b) Early brachiolaria with the large anterior coelom (AC) and left (L) and
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTRAGONADAL DEVELOPMENT IN 19. Figure 2. Light microscopy (Fig. 2a, b. d-f. h)and confocal microscopy (Fig. 2c, g) of internal develop- ment of P vivipara (Fig. 2c, g) and P. parvivipara (Fig. 2a, b, d-f, h). Except in Fig. 2d, the larvae are orientated to facilitate presentation of right and left structures. Scale bars: Fig. 2a, b, d-f. h = 100 /jm; Fig. 2c, g = 50 /jm. (a) Gastrula with large archenteron (Ae) Bp, blastopore. O, oocyte. (b) Early brachiolaria with the large anterior coelom (AC) and left (L) and right (R) coeloms. G, gut. (c) Lett side of a brachiolaria. The left (L) and right (R) posterior coeloms have separated from the anterior coelom (AC). The arrow indicates the position of the hydrocoel. the five lobes of which were seen in the adjacent optical section. G, gut, P. preoral lobe, (d) Section of a brachiolaria showing the small posterior enterocoel (PC). AC, anterior coelom; G, gut; J, metamorphosing juvenile; P, preoral lobe, (e) Tangential section of a brachiolaria show- ing the hydrocoel (H). left posterior coelom (L) and gut (G). P, preoral lobe. (0 Grazing section through the brachiolaria in Figure 2e showing the extension (arrow) of the anterior coelom (AC) into the left brachium. B, brachia; G, gut; L, left coelom. (g) Metamorphosing brachiolaria with the resorbing larval body (arrow) between hydrocoel lobes (HL) one and five, (h) Newly metamorphosed juvenile with two pairs of tube feet (TF). OR, oral water ring. address numerous hypotheses on life history evolution (Byrne, 1995). Most importantly, molecular data con- firm that Patiriella is a monophyletic taxon (Hart, By- rne, and Smith, unpub.) and so the comparisons made here and elsewhere (Byrne, 1991, 1992, 1995; Byrne and Anderson, 1994; Cerra and Byrne, 1995a, b) are not con- founded by divergent phylogeny. In this investigation, the intragonadal development of P. vivipara and P. parvivipara is docume
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
