顶系 meaning in English
apical disk
apical series
apical system
Examples
- The thirty - four species of the sea urchins belong to 7 order , 17 families and 28 genera . the following is the name list , those with an asterisk are the species recorded for the first time in china . order cidaroida family cidaridae * goniocidaris biserialis ( d6derlein ) * stylocidaris bracteata ( a . agassiz ) * stylocidaris ryukyuensis shigei * stereocidaris indica philippinensis mortensen * rhopalocidaris gracilis doderlein order lepidocentroida family echinothuridae * phormosoma bursarium ( a . agassiz ) araeosoma owstoni mortensen asthenosoma ijimai yoshiwara order stirodonta family phymosomatidae glyptocidaris crenularis a . agassiz family arbaciidae * coelopleurus maculata a . agassiz et h . l . clark * coelopleurus undulatus mortensen order aulodonta family diadematidae chaetodiademajaponicum mortensen family pedinidae * caenopedina mirabilis ( d6derlein ) order camarodonta family temnopledridae temnopleurus hardwickii ( gray ) temnopleurus toreumaticus ( leske ) temnopleurus reevesii ( gray ) temnopleurus apodus ( a . agassiz et h . l . clark ) temnotrema sculptum ( a . agassiz ) temnotrema reticulatum mortensen * microcyphus olivaceus ( d6derlein ) * prionechinus forbesianus ( a . agassiz ) family strongylocentrotidae strongylocentrotus nudus ( a . agassiz ) hemicentrotus pulcherrimus ( a . agassiz ) family echinometridae anthocidaris crassispina ( a . agassiz ) order clypeasteroida family clypeasteridae clypeaster virescens doderlein family laganidae * peronellapellucida d5derlein family scutellidae * scaphechinus mirabilis a . agassiz sinaechinocyamus planus liao family fibulariidae fibularia acuta yoshiwara order spatangoida family loveniidae - lovenia triforis koehler echinocardium cordatum ( pennant ) family schizasteridae schizaster lacunosus ( linnaeus ) family brissidae * gymnopataqus magnus ( a . agassiz & h . l . clark ) family spatangidae * spatangus luetkeni a . agassiz among the species reported , the following species call for notes or simple descriptions
本文根据th . mortensen ( 1928 - 1955 )海胆专著( amonographoftheechinoidea )中的主要分类依据，将海胆纲分为8个目： 1 )头帕目( cidaroidea )有齿器，围肛部在顶系内，围口部有步带板和间步带板，大棘很大，有外皮层，无球棘； 2 )鳞棘目( lepidocentroida )有齿器，围肛部在顶系内，围口部仅有步带板，大棘不很大，无外皮层，有球棘； 3 )脊齿目( stirodonta )有齿器，围肛部在顶系内，齿器的齿有脊，桡骨片在齿上方不相接，颚孔开放； 4 )管齿目( aulodonta )齿器的齿无脊，围肛部在顶系内； 5 )拱齿目( camarodonta )有齿器，围肛部在顶系内，齿器的齿有脊，桡骨片在齿上方相接，颚孔封闭； 6 )全雕目( holectypoida )有齿器，但不发达或完全被吸收，围肛部在顶系外，步带不形成瓣状和叶鳃； 7 ) ?形目( clypeasteroida )齿器发达，围肛部在顶系外，步带形成瓣状，无叶鳃； 8 )猬团目( spatangoida )无齿器，围肛部在顶系外，叶鳃发达，步带形成瓣状。