The Echinoid Directory

Taimanawa Henderson & Fell 1969, p. 3

Diagnostic Features
  • Test cordiform with deep anterior sulcus. Ambitus rather sharp and test depressed in profile.
  • Anterior ambulacrum deeply depressed, crossing ambitus in a deep, narrow notch, Pore-pairs small and relatively widely spaced.
  • Other ambulacra narrow and shallowly sunken; parallel-sided and extending only a little over half way to the ambitus.
  • Pores in anterior column of petals II and IV rudimentary adapically; ?no occluded plates distally.
  • Periproct large; occupying much of steeply undercut posterior face.
  • Peristome wider than long; kidney-shaped and largely hidden by projecting labrum.
  • Labral plate very short and wide; not extending beyond first ambulacral plate. Episternals tapering only slightly to rear.
  • Plastron with horizontal suture between sternals and episternals.
  • Spines and tubercles within peripetalous fasciole enlarged in posterior column of paired interambulacra.
  • Well-developed bilobed subanal fasciole.
  • Peripetalous fasciole not deeply indented laterally or posteriorly; deflected towards ambitus anteriorly.
  • Inner fasciole present adapically, but lost towards the ambitus in type species.
Distribution

?Oligocene, Lower Miocene to Recent; New Zealand, Kei Islands, Japan.

Shallow water detrital limestones (fossil); 240 m, Recent.

Name gender feminine
Type
Taimanawa pulchella Henderson & Fell, 1969, p. 6, by original designation.
Species Included
  • T. pulchella Henderson & Fell, 1969; Lower Miocene, New Zealand.
  • T. greyi (Hutton, 1873); Oligocene or Lower Miocene, New Zealand.
  • T. mortenseni Henderson & Fell, 1969, p. 12; Recent, Kei Islands.
  • T. relictus (Shigei, 1975); Recent, Japan.
Classification and/or Status

Spatangoida, Micrasterina, Brissidae.

Monophyletic.

Remarks

Gillechinus is similar in the distribution of primary tubercles on the aboral surface but has a smaller frontal notch and no inner fasciole. This taxon was fully described in Henderson & Fell (1969). The two species described by Henderson (1975) do not show evidence of having had an inner fasciole.

Henderson R.A. & Fell, H. B. 1969. Taimanawa, a new genus of brissid echinoids from the Tertiary and Recent Indo-West Pacific with a review of the related genera Brissopatagus and Gillechinus. Breviora 320, 1-29.

Henderson, R. A. 1975. Cenozoic spatangoid echinoids from New Zealand. Palaeontologial Bulletin, New Zealand Geological Survey 46. 1-127.