Diskussion:Proales daphnicola

Erstbeschreibung

Thompson hat die Art in einem Artikel in Hardwicke's Science-Gossip Volume XXVIII, 1892, erstbeschrieben - da ich auch auf deutsch Probleme mit dem Bio-Sprech habe hier nur mal als Fullquote, vllt kann ja jemand mit Ahnung vom notwendigen Vokabular was mit anfangen:

In the latter part of October of last year, on two occasions, a pond at Leytonstone, Essex, was found to be swarming with numbers of fine red Daphnia pulex; upon many of these occurred, roaming about over the carapace, examples of an illoricate rotiferon which at once struck me as unfamiliar. Eggs were also present attached to the cladoceran's shell, just as in the similar case of P. petromyzon already noticed ; and, as with that species, the rotifer could leave the Daphnia at will, and swim freely. A few notes and a rough sketch of the creature were taken, and its internal anatomy found to present nothing worthy of special remark, the particulars secured being detailed below. I have not since seen further examples of this form either in subsequent dips from the same pond or elsewhere ; the swarms of Daphnias rapidly decreased with the advent of cold weather, and very soon not a specimen was to be taken from the pond. I am constrained therefore to give an account of this creature now, notwithstanding the paucity of particulars, in the hope that others, or I myself, may come across specimens in the ensuing autumn, and fill up any blanks in the present description.

The form is fairly plump, thinning behind without abrupt distinction between the body and foot. The coronal face is obliquely truncate, abundantly ciliated. I saw no frontal proboscis. The mastax of moderate size, the contained trophi of the usual notommatous type. Gastric glands rather large, angular. Ovary small. Brain a clear transparent sac of but moderate length, no trace of an eye being visible. Dorsal antenna not discerned, but the lateral antennae were distinct when the animal was under compression, placed about half way down the body upon the dorso-lateral surfaces, and each connected with a nerve-thread running up towards the front of the body. Lateral canals and their tags were present, also a moderate contractile bladder below the intestine. The muscular system, so far as observed, is quite normal ; several longitudinal "head-retractor" bands run through the body, and some five transverse cords encircle the trunk at equal intervals. The foot-glands are a pair of remarkably long, club-shaped, turgid organs, extending from the toes right up the trunk, to the level of the summit of the contractile vesicle; their ducts plainly open as projecting tubules at the extremities of the large swollen toes. These latter are of peculiar and distinctive shape and will, I think, with their nipple-like ducts, sufficiently identify the species; the foot, of some four joints, is short, and in width not more than one-third the greatest width of the trunk.

This creature bears a certain resemblance, in its long foot-glands, and in the shape of the gastric glands and toes, to a form described by Dr. Plate as parasitic on Gammarus, under the name of Furcularia gammari, but is evidently not identical therewith.

Length, about 1/96 inch.

Sp. Chars :—Body plump ; eye absent; gastric glands angular ; foot glands remarkably long, turgid ; foot short ; toes short, thick, swollen cones, with projecting duct-orifices.

Grüße, rbrausse (Diskussion Bewertung) 22:44, 5. Okt. 2010 (CEST)