. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DISPERSAL AND GENETIC EXCHANGE 295 rather than in distinctive masses as in some of the Cymatiidae and in Phalium granulatum and in most species are usually between 5 and 8 mm in height. The larval shell of Thais haemastoma (Linne) was illustrated by Craven in 1877 as the species Sinusigera colbeauiana. Later in 1883 he figured an early post-larval shell which this time he correctly identified as Thais haemastoma. Dautzenberg (1889, PI. II, Fig. 5) has figured an early post-larval shell from the Azores showing details of the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DISPERSAL AND GENETIC EXCHANGE 295 rather than in distinctive masses as in some of the Cymatiidae and in Phalium granulatum and in most species are usually between 5 and 8 mm in height. The larval shell of Thais haemastoma (Linne) was illustrated by Craven in 1877 as the species Sinusigera colbeauiana. Later in 1883 he figured an early post-larval shell which this time he correctly identified as Thais haemastoma. Dautzenberg (1889, PI. II, Fig. 5) has figured an early post-larval shell from the Azores showing details of the protoconch of Thais haemastoma. Recently Moore (1961) accurately described the shell of the fully developed larva, but his. FIGURE 4. Geographical distribution of plankton tows upon which the present study is based. The darkened circles indicate stations where teleplanic gastropod veligers were found; the open circles denote stations where no such gastropod larvae were taken. In instances when plankton tows were less than one degree apart, points shown on the above and subsequent charts may represent more than one tow. Some stations were repeated at the same location at different times of the year. Locations included in the figure are only those for which entire plankton samples have been examined. Stations appearing on sub- sequent charts but not on this figure represent positive records from loaned plankton tows. They were not used for negative records because material had been previously sorted from them or preservation was poor, and because they had been collected differently. The dashed lines indicate the 21° C summer and winter isotherms. Major surface currents in the North and tropical Atlantic are designated by arrows and may be identified by reference to letters : A = Gulf Stream, B = North Atlantic Drift, C = Canary Current, D = North Equa- torial Current, E = Equatorial Countercurrent, and F = South Equatorial Please note that these images are extracted fr
Size: 1752px × 1426px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
