The Echinoid Directory

Microcyphus Agassiz, in Agassiz & Desor, 1846, p. 358

[=Anthechinus Agassiz, 1863, p. 358, type species Acanthechinus roseus Agassiz, 1863, p. 358 (=Microcyphus maculatus Agassiz, in Agassiz & Desor, 1846 - objective); ?= Martinechinus Jeannet, in Jeannet & Martin, 1937, p. 232, type species Martinechinus molengraaffi Jeannet, in Jeannet & Martin, 1937

See also M. (Salmacopsis) Doderlein, 1885, M. (Printechinus) Koehler, 1927
]

Diagnostic Features
  • Test moderate in size; inflated in profile with rounded ambitus.
  • Apical disc small; dicyclic, with marginally positioned gonopores. Genital plates with tubercles developed around their inner edge forming a perianal ring. periproct central; subcircular; no distinct suranal plate.
  • Ambulacra relatively narrow compared to interambulacra. Plating trigeminate, with echinid-style compounding. Pore-pairs arranged in two vertical columns, with the middle pore-pair (on an occluded plate) displaced adradially to form an outer column.
  • Two subequal tubercles on each ambulacral plate at ambitus and adorally.
  • Small pits at triple suture points on perradius.
  • Interambulacral plates very tall with scattered subequal tubercles and granulation; ambital and adapical plates with rather large wedge-shaped naked zones along horizontal sutures.
  • All tubercles imperforate and non-crenulate.
  • Small pits present at all triple points and along horizontal interambulacral sutures.
  • Peristome ca. 40% test diameter; with feeble buccal notches. Buccal plates small and peristomial membrane rather naked.
  • Lantern camarodont.
  • Spines small, simple, without cortex.
Distribution
Miocene to Recent; Indo-West Pacific.
Name gender masculine
Type
Microcyphus maculatus Agassiz, in Agassiz & Desor, 1846, p. 358, by original designation.
Species Included
  • M. maculatus Agassiz, 1846; Recent, Mauritius.
  • M. ceylanicus Mortensen, 1942; Recent, Ceylon & Andeman Islands.
  • M. compsus Clark, 1912; Recent, Australia.
  • M. excentricus Mortensen, 1940; Recent, Philippines.
  • M. (Printechinus) javanus Jeannet, 1935; Miocene, Java.
  • M. (Printechinus) impressus Koehler, 1927; Recent, Andaman Sea.
  • M. (Printechinus) viridis Mortensen, 1942; Recent, Sumatra.
  • M. (Salmacopsis) keiensis Mortensen, 1942; Recent, Kei Islands.
  • M. (Salmacopsis) olivaceus Doderlein, 1885; Recent, Japan.
  • M. rousseaui Agassiz, 1846; Recent, East Africa, Madagascar, Red Sea.
  • M. zigzag Agassiz, 1846; Recent, Australia.
  • M. annulatus Mortensen, 1904; Recent, Australia.
  • M. molengraaffi (Jeannet, in Jeannet & Martin, 1937); Pliocene, Indonesia.
Classification and/or Status
Euechinoidea; Camarodonta; Temnopleuroida; Temnopleuridae.
Remarks

Distinguished by its broad naked perradial and interradial zones from most other temnopleurids. Distinguished from Mespilia by having interambulacral plates that are almost as wide as tall adapically.

Mortensen (1943) states that Agassiz's Acanthechinus roseus is an objective synonym of Microcyphus maculatus.

Mortensen, T. 1943. A monograph of the Echinoidea Part III.2, Camarodonta 1. C. A. Reitzel, Copenhagen.