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屬的診斷特徵，列出以下8點特性以供參考：

Stylocidaris    Mortensen, 1909

Diagnostic Features：

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  Test moderately thick.

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  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.

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  Interambulacra with 6-8 plates in a series.

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

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

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  Interradial and perradial sutures weakly incised.

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  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.

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

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

Distribution：Miocene 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.