Description Of A Family Sporolithaceae Verheij - 1105 Words

Family Sporolithaceae Verheij, 1993 Genus Sporolithon Heydrich, 1897 (Former name: Archaeolithothamnium Rothpletz, 1891) Sporolithon sp. Morphology: Encrusting thallus of 170 – 190 Â µm in diameter. It is rarely recorded as fruticose growth forms. Vegetative anatomy: Crustose dorsiventeral and monomerous thalli with rounded protuberance measuring 150Â µm in height. The core filaments is commonly thin plumose with cell filaments measuring 13 – 27 Â µm in length and 10 – 15 Â µm in diameter. Cell fusion are scarce. Tetra / biosporangial conceptacles arranged in sori , the sori consists of 12 – 29 tetra / biosporangia that sometimes arise from layer of elongated cells. The shape of conceptacles are elongated ellipsoidal measuring 140 – 160 Â µm in height and 60 – 90 Â µm in diameter. This species is also common in the Miogypsina bioclastic algal packstone facies and coral algal rudstone facies (Pl. 2, Fig. 5) of Early Miocene Sadat Formation. Subfamily Corallinoideae Foslie,1898 Genus Corallina Linnaeus, 1759 Corallina sp. (Pl.1, Fig. 8) Morphology: Arborescent to branching growth form with dichotomous thalli. Vegetative anatomy: few fragments of segmented (geniculated) thalli without genicula, stems are observed (140Â µm thick) composed exclusively of core filaments, cells are 34 – 45Â µm in length and 9 –10Â µm in diameter. No cell fusions were recorded. Conceptacles are not observed in the present specimen. This genus is recorded in bioclastic algal Packstone facies of the Early Miocene