. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERNAL DEVELOPMENT OF 71 Pattern Cavity Adult fate in the terminology of this paper Adult fate in the terminology of Hyman, 1955 Resorbed Inner oral perihemal coelom Axial perihemal coelom Water-vascular system Oral perivisceral coelom Outer oral and radial { erihemal coeloms Aboral perivisceral coelom Gut Resorbed Inner oral hyponeural sinus Axial sinus Water-vascular system Hypogastric coelom Outer oral and radial hyponeural sinuses Epigastric coelom Gut Preoral coelom jjvjj; Axocoel Hft Hydrocoel Somatocoel v
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERNAL DEVELOPMENT OF 71 Pattern Cavity Adult fate in the terminology of this paper Adult fate in the terminology of Hyman, 1955 Resorbed Inner oral perihemal coelom Axial perihemal coelom Water-vascular system Oral perivisceral coelom Outer oral and radial { erihemal coeloms Aboral perivisceral coelom Gut Resorbed Inner oral hyponeural sinus Axial sinus Water-vascular system Hypogastric coelom Outer oral and radial hyponeural sinuses Epigastric coelom Gut Preoral coelom jjvjj; Axocoel Hft Hydrocoel Somatocoel vv Somatocoel v^ t& Archenteron Figure 8. Key to the stippling patterns used in the coding of internal cavities and their adult fates in figures 3. 4, 6, 7. and 10. This information is cross referenced to the terminology of Hyman (1955). coelom. The lateral projections eventually give rise to separate coelomic regions (primarily a sagitally oriented hydrocoel on the left side of the larval body and a so- matocoel on each side of the larva). The anterior region of the unpaired U-shaped coelomic sac extends into the lumen of the brachiolar arms and is considered homol- ogous to the preoral coelom of feeding larvae (Erber, 1985; Strathmann. 1988). Asteroids with indirect development and pelagic non- feeding lan'ae. Several asteroids develop from large eggs (about 1000 urn in diameter) via pelagic nonfeeding bra- chiolarian larvae (distributed in the orders: Forcipulata. Valvatida, Spinulosida, and Velatida: see Fig. 9) (Mc- Edward and Janies, 1993). There are several studies of internal structure in these larvae (, Fromia ghardaq- ana. Mortensen. 1938; Crossaster papposus Gemmill, 1920; Henricia sanguinolenta, Masterman, 1902; and So- laster endeca Gemmill, 1912). The early pattern of an- terior and hydrocoelic coelomogenesis of these brachio- laria is identical to that of the benthic brachiolaria. Features oj coelomogenesis in taxa closely related to Pteraster tesselatus.
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
