The species shows small to large size (5-25 mm) specimens; they generally present a rather uniform color, rarely with more or less conspicuous markings; the hemelytra with a single cell and the hind wings with a transverse thickening; the pretarsi with short arolia, and the phallosoma with spinelike
processes (Wygodzinsky, 1966).
Ribeiria spinosa Babin & Branisa, 1987 from the middle Darriwilian (Llanvirn) of Bolivia and from the Floian (Arenig) of Northwestern Argentina differs in spinelike
projection, placed ahead of the pegma.
fifth and sixth abdominal segments with very large lanceolate and finely ciliated spines on anterior part, setae m1-4 basally swollen, other setae normal; 5 am setae present; female subanal appendages swollen and spinelike
Surface irregularly granulose and posterior margin supplied with a pair of prominent and spinelike
, blunt tubercles (Fig.
Frons entire, with a spinelike
process anteriorly (Fig.
24, paratype): orange-brown, scape and pedicel orange setose (1 dark red-brown setae), postpedicel tipped with obliquely situated pit-enclosed spinelike
sensory element (terminal stylus 'segment' absent).
A line of pins tracing a spinelike
ridge, these towers--and the ephemeral weather effects they produce--suggest a mutable monumentality appropriate to Tschumi's event-based vision of the twenty-first-century city.
11-15): distal conductor strongly tapered and curved to a short, spinelike
apex; MA usually large and prominent; RTA a large ventrad, rectangular plate; RVTA thick, peg-like.
Using millimeter-scale polymer beads for vertebrae and thin elastic threads for muscles and ligaments, the researchers have created spinelike
structures that can deform drastically, even become damaged, yet still return to their original forms.
supraciliary scales between the eye and supraoculars and usually at least 23 dorsal scale rows at midbody distinguish B.
Annuli numbering 69-70, with spinelike
cuticular projections prominent in some individuals.
White and Jarosewich (1971) reported it as occurring "as flat, unmodified rhombohedral crystals which appear to be arranged epitaxially around spinelike
crystals of calcite.