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Please cite this document as:

Lathuilière, B. in prep., Melikerona Alloiteau, 1958, p. 64. In: Cairns, S. D., Baron-Szabo, R., Budd, A.F., Lathuilière, B., Roniewicz, E., Stolarski, J., and Johnson, K.G. (eds.), Corallosphere, world wide web site at http://corallosphere.org/taxon/885, last visited on 10 Feb 2012.
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Melikerona

Alloiteau, 1958, p. 64

Melikerona is probably a synonym of Septastraeopsis

Type Species

Melikerona parva madagascariensis Alloiteau, 1958, p. 65 pl. 1 fig. 8 pl. 7 fig. 4; Original Designation

Type Specimen: Holotype; MNHN M 05091; Verified; Dry Preserved

Type Locality: Callovian (Middle Jurassic) from Ankazomiheva (Madagascar)

It is worth to note that the genus pose several nomenclatural problems concerning the fixation of the type-species. Firstly Melikerona is not based on a type-species but on an infrasubspecific category of this species. This is nomenclaturally disputable. Secondly, Alloiteau used Isastrea parva to create another genus Pseudisastrea . Finally Alloiteau put a question mark between his new genus name (Melikerona) and the species name of the type-species. This is a case of exclusion for the type-species (art 67g). To elaborate the following description, I took in consideration the material on which Alloiteau based his concept of Melikerona. Alloiteau never saw the indian material of Isastrea parva Gregory. A paratype M 08176 exists, more interesting than the holotype, with thin sections.

Description

Massive lamellar cerioid corallum with small superficial corallites. Intracalicular increase. Lower surface costate,with some concentric folds, but without a true epitheca. Radial elements are compact, generally free, straight to curved, non confluent, not exsert. Distal edge regularly dentate, lateral faces with acute granules. Trabeculae oriented subvertically near the wall and a little less inclined toward the axis. Radial symmetry difficult to decipher. Bilateral symmetry marked by the curvature of septa. Endotheca made of vesicular dissepiments sloping down toward the centre of the corallite. Central fossa in depth of which rare major septa can anastomose, occasionnaly a styliform columella is present. No synapticule. Septothecal wall.

Comparisons

The genus is very close of Isastrea. Probably the more septothecal wall, the carinae less developed and occasional columella may justify this genus. It is still closer of Septastraeopsis of which the endotheca could be different (badly preserved in the type material).

Remarks

See Pandey and Fürsich (2005)

Distribution

  • Central Europe, North Africa, Subsaharan Africa, South Asia, West Asia; Middle Jurassic - Late Jurassic

This page has been in preparation since 19-Aug-2009 15:53

This version was contributed by Bernard Lathuilière on 01-Oct-2011 11:07.

Page authors are: Bernard Lathuilière. Please contact the editor if you would like to contribute to the diagnosis of this taxon.

The editor is: Bernard Lathuilière

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