Archive image from page 19 of The Cyathaspididae; a family of. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates cyathaspididaefa135deni Year: 1964 ( 322 FIELDIANA: GEOLOGY, VOLUME 13 Fig. 95. Allocryptaspis laticostata; small plates from anterior part of ventral side of shield (X 4). A, right postoral, PF 1768; B, right postoral, inner side, PF 1763; C, lateral postero-lateral, PF 1782; D, medial postero-lateral, PF 1781; E, anterolateral, PF 1829; F, suborbital, PF 1777; G, oral-lateral, PF 1780; H, possible oral plate, PF 1776. (From Denison, 1960; specimens in C
Archive image from page 19 of The Cyathaspididae; a family of. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates cyathaspididaefa135deni Year: 1964 ( 322 FIELDIANA: GEOLOGY, VOLUME 13 Fig. 95. Allocryptaspis laticostata; small plates from anterior part of ventral side of shield (X 4). A, right postoral, PF 1768; B, right postoral, inner side, PF 1763; C, lateral postero-lateral, PF 1782; D, medial postero-lateral, PF 1781; E, anterolateral, PF 1829; F, suborbital, PF 1777; G, oral-lateral, PF 1780; H, possible oral plate, PF 1776. (From Denison, 1960; specimens in Chicago Natural History Museum.) which suggests that they were set in infoldings of the skin. This arrangement may have permitted the oral plates to have been pro- truded, forming a scoop for feeding in bottom sediments. Heintz has suggested the possibility that when the oral plates were pro- truded, water rich in organic particles may have been drawn into the mouth, and that when the mouth was closed the denticles of the oral tooth lamellae and of the maxillary brim may have served to filter out the food particles. It is also possible that the protruded oral scoop may have had limited ability to pick up selected food particles from the bottom (Denison, 1961, pp. 179-180). In pteraspids an oral-lateral plate (fig. 94,B, olp) lies on either side of the row of oral plates, and is bounded laterally by the rostrum and posteriorly by a lateral plate. No oral-lateral plates are shown in Heintz's figure (1962, fig. 7) of Anglaspis heintzi. A plate has been tentatively identified (Denison, 1960, p. 564) as oral-lateral in Alio-
Size: 1507px × 1327px
Photo credit: © Bookive / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1960, 1964, archive, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, chicago_chicago_natural_history_museum_press, chicago_natural_history_museum, cyathaspididae, denison_robert_h_robert_howland_1911_1985, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
