Jensen OS 1878 (citation)- describes new species p 25-26. Definition in Latin, illustration Plate I figures 9-11. Graff L v 1882 (citation)- lists and describes. Also lists Aphanostoma rhomboides. as separate speceis- description of both. Gamble FW 1893 (citation)- A colorless form - on Ulva at Redding Point- Northern Europe. Bohmig L 1895 (citation)- in list p 44. Graff L v 1905 (citation)- mentions - also illustrates and long description of Aphanostoma rhomboides. Dorjes J 1968 (citation)- lists this as separate species- description of both.
Jensen OS 1878 (citation)- Translation of latin and danish text using Google Translate: Body length 0.81 mm., maximum width o.16 mm., both ends rounded, in wider at the front, gradually narrower at the back. Color: In the middle of the body, a distinct area, large, dark-green, the rest of the body without color. Spermatozoa filiform with no head, spiral in the middle. The dark green part I once saw of a fairly regular, radially lobed form. It stands out strongly by its deep color. Otherwise the body has the usual clear light blue appearance of the tissues; only in the anterior half is there a faint white tinge. I have only incompletely observed the anatomical structure of the animal. Examinations of the Aphanostomum species are also very long and difficult. The delicate animals must be protected from too strong pressure from the cover glass, preferably by a blood feather ray and compressed by capillary adhesion: by the elasticity of the feather ray the pressure can be moderated in the most various ways. In front of the otolith tract I have seen oval rod sacs, filled with rods. The ovaries are as usual in the genus Aphanostomum; they shine through as a white spot just behind the dark green part (Fig. 9. b). The seminal vesicle (Fig. 10) is deeply cleft or perhaps rather double; it is continued in a wide passage across towards the genital opening. The spermatic cords (Fig. 11) are in their anterior part stepped, thin at the most anterior end, yet not tapered and slightly increasing in thickness backwards; in the middle part they are (as I must conclude from the refraction of light) bow-shaped and twisted corkscrew-like in a spiral; they end in a long thin tail. I found sexually mature individuals of this animal in September, together with the previous ones.
Graff L v 1905 (citation)- Discusses Aphanostoma rhomboides and says that A. elegans is conspecific. Translation from german using Google Translate: "Aphanostoma rhomboides (Jens.) Pl. XI, Figs. 11-20. An extremely common form both near Bergen (Puddefjord to Solheimsvik, Follesö on Askö) and near Alexandrovsk (Yekaterinhafen, Pala Guba). Through the examination of numerous specimens, I have come to the conclusion that the minor differences, mostly merely concerning shape and color, which are supposed to separate this species from Jensen's Aphanostoma elegans, are due to greater or lesser amounts of pigment, contraction conditions, and the nature of the diet, while young specimens resemble Mecynostomum agile, established by the same author. Even more than from my preliminary report, the correctness of my interpretation will be demonstrated by comparing the illustrations."
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