. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 18 M. BYRNE AND A. CERRA Table I Size c/ eggs, larvae and newly metamorpho of Patiriella species (SE. n) Newly Oocyte: Brachiolaria metamorphosed diameter larva: length juvenile: Species (l*m) (nm) diameter </im) I'llll ic/lii n'x//A/ns 150 (,20) 1430 () () Kill icllti culctit' 415 (,60) ( 10) (, 10) I'un ii'/lti fuinnii 400 (,60) 490 ( 12) NA I'llll U'lkl t'.\li,'llll 390 () 690 (,7) 580 (,20) 1'uii li'/ln rmparn 148 () 270 ( 17) 314 (, 12) Pun
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 18 M. BYRNE AND A. CERRA Table I Size c/ eggs, larvae and newly metamorpho of Patiriella species (SE. n) Newly Oocyte: Brachiolaria metamorphosed diameter larva: length juvenile: Species (l*m) (nm) diameter </im) I'llll ic/lii n'x//A/ns 150 (,20) 1430 () () Kill icllti culctit' 415 (,60) ( 10) (, 10) I'un ii'/lti fuinnii 400 (,60) 490 ( 12) NA I'llll U'lkl t'.\li,'llll 390 () 690 (,7) 580 (,20) 1'uii li'/ln rmparn 148 () 270 ( 17) 314 (, 12) Pun iclla parvivipara 135* () 207 (,12) 244 ( 37) NA, data not available * Largest primary oocytes seen in gonad. with brooding in echinoderms (Byrne. 1991, 1996). Both of these species are small and hermaphroditic. P. vivip- ara has a maximum arm radius (R) of mm, and P. parvivipara, the smallest known sea star, has a maximum radius of mm (Dartnall, 1969; Keough and Dartnall. 1978; Byrne, 1996). Fertilization occurs in the gonads, most of which are ovotestes. The simultaneous presence of mature eggs and sperm in the gonads of P. vivipara and P. parvivipara creates the potential for self-fertiliza- tion. Associated with their low-dispersal life history, Pati- riella vivipara and P. parvivipara have the most re- stricted distribution known for the Asteroidea. P vivip- ara is endemic to southeast Tasmania where it is re- corded from four locations (Dartnall. 1969). P. parvivipara is restricted to the west side of the Eyre Pen- insula in South Australia where it is recorded from five locations (Keough and Dartnall, 1978). Both species have a geographic distribution of 150-300 km. These species are intertidal and inhabit about 100m of the shoreline at each location where they occur. P. vivipara and P. parvivipara are morphologically similar to the sympatric species P. exigita and, prior to the observation of parturition, were considered to be variants of that spe-
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
