. The causes and course of organic evolution; . Fig. 21.—Relation of Rotifera to Annelida, a, simple Rotifer; h, young ortrochophore stage of Annelid; c, trocliophore stage of Polygordius: d, seg-mented Rotifer NoLommala; e, polytrochal larva of the annelid Ophryolrocha;f, polytrochal stage of Polygordius;g, compounded rotiferan diagram of Alberlia-Taphrocarnpa; h, embryonic stage of Aeolosoma; i, third stage of Folyjordius. 17 514 Causes and Course of Organic Evolution The remarkable organism Stylochceta fusiformis that wasfirst described as a new Rotifer under the name Polyarthrafusiformis (
. The causes and course of organic evolution; . Fig. 21.—Relation of Rotifera to Annelida, a, simple Rotifer; h, young ortrochophore stage of Annelid; c, trocliophore stage of Polygordius: d, seg-mented Rotifer NoLommala; e, polytrochal larva of the annelid Ophryolrocha;f, polytrochal stage of Polygordius;g, compounded rotiferan diagram of Alberlia-Taphrocarnpa; h, embryonic stage of Aeolosoma; i, third stage of Folyjordius. 17 514 Causes and Course of Organic Evolution The remarkable organism Stylochceta fusiformis that wasfirst described as a new Rotifer under the name Polyarthrafusiformis (167: 59) is a type that strikingly combines roti-feran, gastrotrichan and chaetophoran characteristics; thoughmost nearly conforming to the second of these groups, as Hlavahas shown (168: 247). The seven fresh-water species of ^olosoma belonging tothe iVphaneura show a ciliated prostomium that corresponds tothe trochal disc ia Rotifera (Fig. 21 g, h); a delicate chitinouslayer that suggests the similar layer of the latter; set?e thatare deli
Size: 1060px × 2359px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, bookidcausescourseofor00macf
