Genus Placopegma Schulze, 1895

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• Placopegma Schulze, F.E. 1895. Hexactinelliden des indischen Oceanes. I. Die Hyalonematiden. Abhandlungen der Königliche Akademie der Wissenschaften zu Berlin (Physikalische Klasse) (2): 1-60 [Date published 1895: dated 1894].

  Type species:

   Placopegma solutum Schulze, 1895 by monotypy.

Distribution

IBRA and IMCRA regions

IMCRA

Northeast Province (18), Northeast Transition (19)

Diagnosis

Body is oval with a circular colander-like fold in the middle directed downwards, lophophytose with flat upper part where a single terminal osculum with sieve-plate or prostalia marginalia are located. Basalia are four-toothed anchors and, probably, monaxone spicules with rounded outer ends, which are gathered in a more or less compact tuft in the lower end. Choanosomal spicules and spicules of the sieve-plate are diactines, sometimes hexactines. Dermalia and atrialia are pentactines, rarely hexactines. Hexactines similar to dermal and atrial ones are found among the sieve-plate spicules. Microscleres are discohexasters, sometimes in combination with plumicomes and hexasters and hexactines and discohexactines.

Diagnosis References

Tabachnick, K. 2002. Family Euplectellidae Gray, 1867. pp. 1388-1434 in Hooper, J.N.A. & Soest, R.W.M. Van (eds). Systema Porifera. A guide to the classification of sponges. New York : Kluwer Academic/Plenum Publishers Vol. 2. [1401]

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