The Echinoid Directory

Vinchuscanchaia Smith, 1994, p. 193

Diagnostic Features
  • Test small (estimated diameter ca. 30 mm); interambulacral plating rigid; ambulacral-interambulacral suture imbricate.
  • Apical disc apparently rather small; plating unknown.
  • Ambulacra narrow and almost straight. Pore-pairs uniserial; plating pseudobigeminate with primary tubercle on every second plate at ambitus and adorally.
  • Pore-pairs small and non-conjugate; uniserial.
  • Interambulacral zones wide with about 8 relatively low and wide plates in a column.
  • Single large primary interambulacral tubercle dominates each plate; mamelon large and perforate, surrounded by a narrow, smooth platform.
  • No scrobicular circle; small secondary tubercles present only adradially and interradially, a few granules present interradially.
  • Interior of interambulacral zone along adradial margin strongly denticulate.
  • Peristome larger than apical disc, circular; no buccal notches.
  • Interior of peristome with no perignathic girdle.
Distribution
Late Triassic or early Jurassic; Peru.
Name gender feminine
Type
Vinchuscanchaia kieri Smith, 1994, p. 193, by original designation. Holotype; Smithsonian Institution, Washington USNM 398508.
Species Included
  • Only the type species.
Classification and/or Status

?Euechinoidea stem group; Triadocidaridae.

Monotypic.

Remarks

The absence of well developed scrobicular tubercles, and the relatively small mamelons surrounded by a distinct parapet differentiates this from other Triadocidaridae.

Smith, A. B. 1994. Triassic echinoids from Peru. Palaeontographica A 233, 177-202.