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Stramentum (Logan, 1897)

 

These distinctive cirripedes have a relatively small captiulum and a broad, well-armoured peduncle.  Exceptionally, associated individuals are preserved together along with the object that they were attached too, typically an ammonite.  Isolated skeletal elements are minute and liable to be overlooked.  Stramentum occurs in the Cenomanian and the Turonian.

 

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1).  Stramentum pulchellum - near perfect specimens; (A) Part of a small cluster of individuals attached to a large ammonite (Lewesiceras peramplum) (x2.7, New Pit Chalk, Turonian, Cuxton, Near Rochester, Kent, BMNH (British Museum (Natural History) London) I.9130).  Image  2008 The Natural History Museum, by kind permission; (B) Plaster cast of the holotype (in the BMNH) (x3.1, Grey Chalk?, Kent, from the Willett Collection, Booth Museum, BMB 007791, by kind permission of John Cooper). 

 

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2).  Stramentum pulchellum; (A) Part of a small cluster of individuals attached to a large ammonite (Lewesiceras peramplum) (x3.7, New Pit Chalk, Turonian, Cuxton, Near Rochester, Kent, BMNH (British Museum (Natural History) London) I.9130).  Image  2008 The Natural History Museum, by kind permission; (B) An individual whose capitulum (top-right) has become detached from its armoured peduncle (bottom-left), x6.2 (Turonian, Malling, near Lewes, Sussex, from the Willett Collection, Booth Museum, BMB 007790, by kind permission of John Cooper).

 

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3).  Stramentum pulchellum; (A) Detail of an exceptionally preserved individual displaying an intact capitulum (x6.2, New Pit Chalk, Turonian, Cuxton, Near Rochester, Kent, BMNH (British Museum (Natural History) London) I.9130).  Image  2008 The Natural History Museum, by kind permission; (B) Isolated peduncle (x8.0, Turonian, Malling, near Lewes, Sussex, from the Willett Collection, Booth Museum, BMB 007790, by kind permission of John Cooper). .

 

4). Stramentum pulchellum - cluster of individuals attached to the venter of a large ammonite (Lewesiceras peramplum) (x0.6, New Pit Chalk, Turonian, Cuxton, Near Rochester, Kent, BMNH (British Museum (Natural History) London) I.9130).  Image  2008 The Natural History Museum, by kind permission.

 

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5).  Complete specimen of Stramentum pulchellum pressed against the ammonite to which it was attached in life, Grey Chalk, Glynde, Sussex, Booth Museum, BMB 009688, by kind permission of John Cooper; (A) general view, the cirrepede is circled on the right, x1.5; (B) detail, showing the very well preserved individual.

 

6).  Stramentum pulchellum.  Associated individuals, the object of attachement has not been preserved and was presumably some form of aragonite mollusc, x2.5 (Turonian, Malling, near Lewes, Sussex, from the Willett Collection, Booth Museum, BMB 007790, by kind permission of John Cooper).