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Spiniferites ellipsoideus
Spiniferites ellipsoideus Matsuoka, 1983
Holotype: Matsuoka, 1983, pl.13, figs.6a-b
Locus typicus: river cliff of Shin-shinanogawa, Teradomari-cho, Niigata Prefecture, Central Japan.
Stratum typicum: Teradomari Formation - Middle to Late Miocene.
Age: MiddleLate Miocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Spiniferites ellipsoideus Matsuoka, 1983b, is elliptical (obvious) with a smooth to faintly granulate wall. Processes are gonal only, long conical and tapering, mostly trifurcate and possessing bifid extremities. Parasutural septa developed. Size: length 36-49 µm, width 24-33 µm, length of processes up to 13 µm.
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Original diagnosis: Matsuoka 1983, p. 132: Spiniferites ellipsoideus Cyst elliptical and having smooth to faintly granular wall. Processes gonal only, long, conical to tapering, mostly trifurcate and possessing bifid extremities. Occasionally parasutural septa membraneous in the hypocyst. Archeopyle precingular and derived from the 3" paraplate.
Original description: Matsuoka 1983, p. 133: Spiniferites ellipsoideus
The small elongate proximochorate cyst is composed of two layers, periphragm and endophragm adpressed between processes. The surface of the periphragm is finely granular to smooth. The gonal processes are long, subconical to tapering, occasionally membraneous, and mostly furcate with bifid distal ends. Parasutures are clearly indicated by membraneous septa. The archeopyle is the elongate pentagonal precingular type and made by displacement of the 3" paraplate. The paratabulation basically coincids with that of the genus.
Dimensions: Holotype: Length of cyst 40 µm, width of cyst 27 µm, length of processes 6-9 µm, width of paracingulum 6.7 µm. Other specimens: Length of cyst 36-49 µm, width of cyst 24-33 µm, length of processes up to 13 µm. Number of specimens measured: 11.
Occurrence: Rare to few in the Teradomari Formation and Shiiya Formation (Middle to Late Miocene or younger).
Remarks: Matsuoka 1983, p. 133
Spiniferites ellipsoideus sp. nov. is characterized by the elongate cyst body with somewhat membraneous parasutural septa in the hypocyst. This species resembles Spiniferites elongatus in having the elongate cyst body, but differs from the latter in possessing a shorter and wider cyst body. On the basis of both species having an elongate cyst body and some membraneous parasutural septa in the hypocyst, a phylogenetic relationship may be recognized between S. ellipsoideus and S. elongatus. Biostratigraphically S. ellipsoideus has a restrictive range from Middle to Late Miocene or younger, while the range of S. elongatus has been known from Pliocene to Holocene in Europe (HARLAND, 1979) and the present area. These data suggest strongly that S. ellipsoideus might be an ancestal form of S. elongatus.
Holotype: Matsuoka, 1983, pl.13, figs.6a-b
Locus typicus: river cliff of Shin-shinanogawa, Teradomari-cho, Niigata Prefecture, Central Japan.
Stratum typicum: Teradomari Formation - Middle to Late Miocene.
Age: MiddleLate Miocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Spiniferites ellipsoideus Matsuoka, 1983b, is elliptical (obvious) with a smooth to faintly granulate wall. Processes are gonal only, long conical and tapering, mostly trifurcate and possessing bifid extremities. Parasutural septa developed. Size: length 36-49 µm, width 24-33 µm, length of processes up to 13 µm.
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Original diagnosis: Matsuoka 1983, p. 132: Spiniferites ellipsoideus Cyst elliptical and having smooth to faintly granular wall. Processes gonal only, long, conical to tapering, mostly trifurcate and possessing bifid extremities. Occasionally parasutural septa membraneous in the hypocyst. Archeopyle precingular and derived from the 3" paraplate.
Original description: Matsuoka 1983, p. 133: Spiniferites ellipsoideus
The small elongate proximochorate cyst is composed of two layers, periphragm and endophragm adpressed between processes. The surface of the periphragm is finely granular to smooth. The gonal processes are long, subconical to tapering, occasionally membraneous, and mostly furcate with bifid distal ends. Parasutures are clearly indicated by membraneous septa. The archeopyle is the elongate pentagonal precingular type and made by displacement of the 3" paraplate. The paratabulation basically coincids with that of the genus.
Dimensions: Holotype: Length of cyst 40 µm, width of cyst 27 µm, length of processes 6-9 µm, width of paracingulum 6.7 µm. Other specimens: Length of cyst 36-49 µm, width of cyst 24-33 µm, length of processes up to 13 µm. Number of specimens measured: 11.
Occurrence: Rare to few in the Teradomari Formation and Shiiya Formation (Middle to Late Miocene or younger).
Remarks: Matsuoka 1983, p. 133
Spiniferites ellipsoideus sp. nov. is characterized by the elongate cyst body with somewhat membraneous parasutural septa in the hypocyst. This species resembles Spiniferites elongatus in having the elongate cyst body, but differs from the latter in possessing a shorter and wider cyst body. On the basis of both species having an elongate cyst body and some membraneous parasutural septa in the hypocyst, a phylogenetic relationship may be recognized between S. ellipsoideus and S. elongatus. Biostratigraphically S. ellipsoideus has a restrictive range from Middle to Late Miocene or younger, while the range of S. elongatus has been known from Pliocene to Holocene in Europe (HARLAND, 1979) and the present area. These data suggest strongly that S. ellipsoideus might be an ancestal form of S. elongatus.