Marcus E 1950 (citation) pg. 104: 'An ample material of Microstomum gabriellae, n. sp. (Fig. 33-38) was obtained at the island of São Sebastião in the zone of mean low tides, where the worms live among algae, chiefly Sargassum stenophyllum. In april and june 1949 they were all dividing and without sexual organs. The adhesive gland-cells (h) correspond to Wagner's description (1891), not to Hofstn's (1907). The epidermis has depressed nuclei in the ciliated pits and the anterior region of the body (Fig. 34, 37, v) and normal ones in the rest (x). The pharyngeal nerve-ring is closed as in Graff's figure (1904-1908, f. 36 on p. 2167), not open in front (Kepner & Taliaferro 1912). The nerves that join the ring to the brain (Luther 1904, p. 76, note 1) are the ventro-lateral nerves of Kepner & Taliaferro. Graff (1913) records records 9 marine species (listed on p. 24) Of these only M. groenlandicum (Lev.) combines rhabdites all over the body wtih a photo-receptor, but the latter is a single median eye. Moreover the intestine of rgoenlandicum is provided with lateral, lobulated diverticles. Of the 5 marine species described since 1913, only dermophthalumum and melanopthalmum have eyes. In the first species these eyes are epithelial pits (in gabriellae pigment-spots); in the second they are black with a refractive cell that functions as a lens (red eyes without lens in gabriellae).'
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