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Lithopera neotera Sanfilippo and Riedel, 1970

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Lithopera (Lithopera) neotera Sanfilippo and Riedel. n. sp.
Plate 1. figures 24-26. 28


Description: Subellipsoidal shell, of which the thorax forms the major part. Cephalis spherical, usually poreless, half or more of it sunken into the thorax, with a small apical horn. Collar stricture generally not pronounced externally. From the base of the cephalis, primary lateral and dorsal spines extend in the thoracic wall or within the thoracic cavity to join the inner surface of the upper wall. Remainder of shell subellipsoidal, with subregular pores not arranged in rows, and with practically no tendency to form a spongy meshwork. In
some specimens, a line in the shell wall (with no change in contour) distally separates a short, flattened area, which may be regarded as an abdomen, from the remainder, which may be regarded as the thorax.


Measurements: Based on 35 specimens from cores DODO 39P, 184-186 cm. and 330-332 cm . ; EM 8- 15 , 588-590 c m .; PROA 102P, 100-102 cm. and 380 - 382 cm ; and SDSE 76, 1228-1229 cm. Total length 95-150 Ám. Maximum breadth 75-130 Ám.


Remarks: This species is distinguished from L. bacca by its thicker wall, never so regular pores, and less regular contour. It differs from L. baueri in its much smaller dimensions and in not having a spongy wall, and from L. renzae in not having a spongy wall and in its less
pronounced third segment.


The specific name is derived from the Greek neoteros, meaning younger.
Sanfilippo and Riedel 1970


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