2010年9月8日 星期三

Cidaridae頭帕科 - Stylocidaris屬的診斷特徵

Cidaridae頭帕科 - Stylocidaris屬的診斷特徵


 


英國自然歷史博物館(The Natural History Museum)針對Cidaridae頭帕科之Stylocidaris的診斷特徵,列出以下8點特性以供參考:


 


Stylocidaris    Mortensen, 1909


 


Diagnostic Features


 




  • Test moderately thick.


 




  • Apical disc about 50% of test diameter;


 



 


 


generally monocyclic with oculars narrowly insert. Genital plates all similar in size; apical disc plates uniformly covered in tubercles.



 



 




  • Interambulacra with 6-8 plates in a series.


 


 


Primary tubercle perforate, non-crenulate or weakly subcrenulate adapically; areoles circular and incised; widely separated.



 



 




  • Scrobicular tubercles not much differentiated. Extrascrobicular zones small and densely covered in heterogeneous secondary tubercles and granules.






  • Interradial and perradial sutures weakly incised.


 





 




  • Ambulacral zones weakly sinuous. Pore- zones a little incised; pore-pairs non-conjugate. Perradial zone with marginal series of contiguous primary tubercles plus much smaller inner series.


 




  • Peristome smaller than apical disc. Ambulacral plates uniserial in each column; interambulacral series reaching the mouth.


 



 



 




  • Primary spines weakly fusiform and slender; neck and collar short; shaft ornamented by beaded or serrated ribs.


 


 


 


 


DistributionMiocene to Recent, widespread


 


Species Included



  • S. affinis (Philippi, 1845); Recent, Mediterranean, Atlantic, Caribbean.
  • S. lineata Mortensen, 1910; Recent, Caribbean.
  • S. reini (Doderlein, 1887); Recent, Indo-West Pacific.
  • S. amboinae Mortensen; Recent, Indo-West Pacific.
  • S. annulosa Mortensen, 1927; Recent, Philippines.
  • S. conferta (Clark, 1916); Recent, Australia.
  • S. rufa Mortensen, 1928; Recent, Hawaii.
  • S. calacantha (Agassiz & Clark, 1907); Recent, Hawaii.
  • S. bracteata (Agassiz, 1879); Recent, Indo-West Pacific.
  • S. maculosa Mortensen, 1928; Recent, North West Pacific.
  • S. effluens Mortensen, 1927; Recent, Philippines.
  • S. tiara (Anderson, 1894); Recent, Indian Ocean.
  • S. lorioli (Koehler, 1927); Recent, Indian Ocean.
  • S. albidens Clark, 1925; Recent, Indian Ocean.
  • S. badia Clark, 1925; Recent, Mauritius.
  • S. brevicollis (de Meijere, 1904); Recent, Indo-West Pacific.
  • S. fusispina Mortensen, 1928; Recent, Japan.
  • S. melitensis (Wright, 1855); Miocene, Mediterranean.

 


 


Classification and/or Status


Cidaroida頭帕目, Cidaridae頭帕科, Cidarinae.


Possibly not a monophyletic group. Treated here as a subgenusof Tretocidaris.


 


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