等了好久, 終於等到paleoart po 出纖細-寬展櫛蟲Asaphus expansus gracilis(Ivantsov
2000),因為看了網站上很多隻,但都怕自己眼光不準,買到錯的,於是便想等paleoart po出
後,看看再購買,但是等到這隻po 出後,對照之前TOMM大給我的參考文獻及之前詢問與As
asaphus expansus robustus碩-寬展櫛蟲的差異點(除了尾葉較薄,眼距較短這2點較合乎外)
,我還是覺得有點不像,於是又發信去ASK Paleoart,他們給我的回應如下:
robustus and gracilis are the subspecies of As. expansus
species,subdivided by Ivantsov (2000). The have only little
differences:
the hatching ofn the cephalone of gracilis is almost absent
(well developed for robustus);the cephalone of gracilis is
more flat, not so high and massif as of robustus.
並且他們保證這一隻的確是纖細-寬展櫛蟲Asaphus expansus gracilis(Ivantsov 20
00),所以便下手收入這隻,請大家觀賞^^
另外請參考我格中的另一隻碩-寬展櫛蟲Asaphus expansus robustus
以及格友carl格中的纖細-寬展櫛蟲Asaphus expansus gracilis
Asaphus expansus robustus碩-寬展碩櫛蟲
carl 部落格中的纖細-寬展櫛蟲 Asaphus expansus gracilis
一.母岩照(旁邊那個不知是何化石?)
二.蟲體近拍 5.2 cm
三.右側拍
四.左側拍
五.大頭照
六.頭部上拍
學名: Asaphus expansus gracilis ( Ivantsov 2000) 纖細-寬展櫛蟲 5.2cm
年代: Lower Ordovician , Kunda level (468Ma)
奧陶紀早期,昆達階(468Ma)
產地: Volkhov river, St. Petersburg region, Russia
沃爾霍夫河,聖彼德堡地區,俄羅斯