Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 246 MARINE ANIMALS annelid Spirorbis. The most frequent hydroids are Clytia and Lao- medea. A small sessile ascidian (Diplosoma) is present. The nudi- branch, Scyllaea pelagica, creeps over the weed, and the weak swim- ming crab, Planes minutus, uses it as a resting place. The Sargasso fish Pterophryne makes a nest among the 'leaves' by tying them together with mucus. The weed is yellowish brown, spotted
Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 246 MARINE ANIMALS annelid Spirorbis. The most frequent hydroids are Clytia and Lao- medea. A small sessile ascidian (Diplosoma) is present. The nudi- branch, Scyllaea pelagica, creeps over the weed, and the weak swim- ming crab, Planes minutus, uses it as a resting place. The Sargasso fish Pterophryne makes a nest among the 'leaves' by tying them together with mucus. The weed is yellowish brown, spotted with white by the Membranipora and Spirorbis. Many of the Sargasso animals are similarly white- spotted on a yellowish brown ground color; they may have re- markable weed-like appendages. This is especially true of the fishes (pipefish and sea horse, besides Pterophryne) and the nudibranch, as well as certain The enemies against which this coloration may protect them are doubtless the sharp-sighted A number of unexplained faunal parallels exist between the fauna of this area and that of the Mediterranean, such as similar compositions of the nannoplank- ton, similar radiolarians, with Lithoptera fenestrata known only from these two regions; other species with similar distribution include the annelid Alciopa con- trainii, and the copepod Copilia mediterranea. For the rest, the Sargasso Sea is characterized by poverty of plankton. Its water is remarkably clear; the Seechi disk is visible to 66 m. depth as compared with 33 m. in the Mediterranean, 20 m. in the North Sea, and 13 m. in the Baltic. Among the few abundant forms are the water flea, Evadne spinijera, and the larvae of the forms living on the weed. The high temperature of the water at considerable Fig. 62.—Floating piece of sarga?- sum, covered with the hydroids Aqlao- phenia and Clytia, the bryozoan Mem- branipora, and the tube building worm Spirorbis. After Hentschel.
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