Meaning of radiole | Babel Free

Definitions

1. The spine of a sea urchin.
2. A heavily ciliated feather-like tentacle occurring in clusters on the crowns of certain tubeworms, especially those of the order Canalipalpata (fan-head worms), used for feeding and respiration.

Equivalents

Examples

“Radioles or spines [...] are the appendages articulating upon the tubercles. The different parts of the spines are the socket by which it is articulated to the tubercles; the lower part of the radiole is called the head, and is separated from the neck, which is usually smooth or finely striated, by the milled ring⟳,—a prominent ridge more or less deeply grooved, serving as an attachment for the muscles which are to move⟳ the spine; beyond the neck we have⟳ the body or shaft of the spine.”

“The radioles of the second size are about 8 millims. in length and 2 millims. in width, very much compressed and flattened, rounded at the end⟳ and finely striated longitudinally. They are articulated in a single row to the small tubercles round the edge of the areola, and in their natural attitude they lean⟳ over the naked part of the areola and cover⟳ the muscles and the head of the large radiole like⟳ a frill.”

“Archæocidaris sp. b. [...] This form⟳, which is very imperfectly known, is based on two specimens. One of these shows the distal end⟳ of the radiole, which is seen to expand⟳ rather abruptly from a very slender shaft having a diameter of about three-fourths mm. into a subspherical end⟳ which has a diameter of 2 mm. The terminal portion and the shaft adjacent appear⟳ to be armed with short spinules. Associated with the foregoing is the proximal portion of a radiole, showing a long, slender, smooth, cylindrical shaft, which has a diameter of about three-fourths mm., with the usual subterminal collar near the lower end⟳.”

“The species P. wellmanae would here be synonymised with P. duncani if only the holotype test⟳ was known. The younger Te Piki test⟳ fragments are indistinguishable from P. wellmanae (and P. duncani), but the radioles differ⟳ from those of P. duncani (i.e., P. wellmanae is here being distinguished by features not seen in this holotype). Discovery of topotype radioles will be necessary to confirm⟳ the present⟳ interpretation and usage.”

“Fabricia bikinii, n. sp. [...] The tentacular crown is composed of three pairs of symmetrical radioles; in addition there are shorter, entire, paired filamentous processes, or palpi, at the ventral end⟳ of the crown [...]. Each radiole has 6 to 8 pairs of slender filaments that arise⟳ along the basal half of the radiole; these filaments extend⟳ distally not quite as far as the radioles to which they are attached.”

“The anterior segments of sabellid and serpulid worms are modified in two important ways: the head has a crown of pinnate radioles arranged in two spirals or semicircles above the mouth, and some of the anterior segments form⟳ a thoracic region [...]. In the Serpulidae, one (sometimes two) of the radioles is modifed as an operculum, which blocks the mouth of the tube when the worm retreats.”

“Family Sabellidae [...] Head with a characteristic crown of 2 groups of pinnate projections called radioles [...], which sometimes bear⟳ eyes, and project from the tube when the worm is feeding.”

CEFR level