原文Introduction: typically very spinose and densely sculptured trilobites. ) z/ e+ O9 u, D% |Cephalon: convex; glabella tapering forward or subparallel, extending to anterior margin or nearly so, less complex lobation than in Lichoidea; eye ridges run from anterior end of glabella to palpebral lobe; opisthoparian sutures, often placed on sutural ridges; distinct notch in margin of free cheek adjacent to where anterior sutures cut cephalic margin; facial sutures secondarily lost in some genera; short genal spines typically present. 5 f) z, N% ?% h$ b0 D. b2 m/ w9 d& FThorax: 8 – 10 segments; tips of each bear 2 – 3 pairs of spines (anterior pair often difficult to see, ventrally directed); often with symmetrical row arrangements of pleural spines or tubercles. ' r* r6 v# g1 k0 A. h8 w& @& G
Pygidium: micropygous, short, transverse, with 2 – 3 axial rings (3rd often faint), one or more pairs of tubular border spines, the largest of which connected to first axial ring by prominent ridge.
- [% G* u9 x* H( X 9 a$ w4 A: z( ?大概意思是8 - 10的每一段;2 - 3双棘 外骨骼非常多刺 8 {/ j9 [! n4 b! t) o , c. ?8 r B- \+ E& d8 i# f2 l% d! ^% f" \ k. A4 A/ f' g
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pygidium micropygous transverse,bearing one or more pairs of spines,larges of which connected to first axial ring via porminent ridge 这句的大概意思是小尾板横向、轴承的一个或多个双棘,具有轴环然后连接到通过的背脊上。 翻译错了帮忙改正