""'Glabella henrikasi " "'is a species of sea snail, a marine gastropod mollusk in the family Marginellidae, the margin snails.
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It can easily be distinguished from all other Agnostida because the frontal lobe of the central raised area of the headshield ( or glabella ) is wider than the rear lobe.
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At the front of the glabella is a notch ( frontal sulcus ), a characteristic unique to the species, making it easy to distinguish from other members of the genus.
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The hypostome can be classified into three types based on whether they are permanently attached to the rostrum or not and whether they are aligned to the anterior dorsal tip of the glabella.
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The front of the glabella also has three dead-ending furrows, a very short one on the midline and left and right a longer one, directed inward and slightly backward.
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Phacopida had 8 to 19 thoracic segments and are distinguishable by the expanded glabella, short or absent preglabellar area, and schizochroal ( Phacopina ) or holochroal ( Cheirurina and Calymenina ) eyes.
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In the Phacopidae a merger of the anterior and the two pairs of neighbouring lobes of the glabella forms a frontal lobe that expands forward and can be inflated and overhanging the frontal border.
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To the back of the glabella two furrows ( or sometimes one ) cross the glabella forming two rings ( " intercalating / pre-occipital ring " and " occipital ring " ).
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To the back of the glabella two furrows ( or sometimes one ) cross the glabella forming two rings ( " intercalating / pre-occipital ring " and " occipital ring " ).
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""'Discodoris glabella " "'is a species of sea slug, a dorid nudibranch, shell-less marine opisthobranch gastropod mollusks in the family Discodorididae.
