词汇 | denticle |
释义 | BETA Examples of denticledenticle isn’t in the Cambridge Dictionary yet. You can help! The denticles are compressed like those of the anterior process and fused. The posterior process, straight or slightly turned downward, has straight, well-developed denticles of approximately equal sizes. The cusp is broad and pointed and, in adult specimens, the anteriormost denticle can be markedly bigger than the rest, especially in the short form. The posterior process is slightly curved aborally and bears relatively large, straight denticles of about equal size. The anterior process usually has four to six small, reclined denticles. The number of denticles on adult specimens ranges from five to eight. The ridge crest often is aligned with a line through the very tips of the nearest free denticles. Both posterior coronoids have uneven rows of large denticles, with individual denticles approaching the size of adjacent maxillary teeth. Most specimens are very short and high with 2 (-3) posterior and about 6 anterior denticles. Denticles on the posterior process are erect and regular, whereas denticles on the lateral process are small and slightly inclined towards the cusp. The distal margin of each leaf has 1-2 small denticles. Overall the denticles are poorly preserved or present as basal sections. The veins branch 2-4 times, with a vein-terminal entering each marginal denticle of the leaf. The tip of the long process and of some of its denticles and cusp has been broken away post-mortem. Cusp and at least 10 denticle tips fused to a ridge, other tips short-tipped or more or less blunt. The three anteriormost denticle tips lost post-mortem. Most of the specimens in the collection are characterized by adenticulate lateral processes, however, there are a few gerontic specimens bearing two denticles on the lateral processes. Apical border of the segment with, on each side, some 7 spines, varying much in size, the longest half as long as the segment, and with denticles at their base. Anterior process is projected anteriorly or slightly turned inward, usually with one to four small reclined denticles. |
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