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Neoeurysphaeridium
From Williams et al., 2017:
[Neoeurysphaeridium, Slimani, 1994, p. 77-78
According to Slimani (1994, p.77) this may be the taxonomic senior synonym of Eurysphaeridium (name not validly published). However, Eurysphaeridium has no formal type, and the other specific epithet assigned to Eurysphaeridium has been synonymized with another genus.
Type species: Neoeurysphaeridium glabrum, Slimani, 1994 (pl.13, figs.1–4; text-figs.12A–B)]
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Original description: [Slimani, 1994]: (Translation: LPP):
Diagnosis:
Skolochorate, gonyaulacoid cyst. The central body is subsphaeroidal to ellipsoidal, lacks parasutural reliefs and bears an apical protrusion and intratabular processes. The precingular and postcingular processes, one per plate, are tubular, very large, closed or open distally, and occupy nearly the complete intratabular surface, whereas the apical, paracingular, parasulcal and antapical processes are smaller, narrower, simple solid or hollow. The antapical process and/or rare (1 to 3) precingular and postcingular processes often undergo a change of size and shape. The periphragm and endophragm are appressed between the processes.
The paratabulation is gonyaulacoid, conform the following formula: 4`, 5``, 6c, 4-5``, 3-5s, 1p, 1````.
The archaeopyle is precingular type P (3`` only), the operculum is free.
The paracingulum and parasulcus are generally indicated by 2 to 3 simple processes per plate.
Affinities:
Neoeurysphaeridium and Achilleodinium Eaton, 1976 are resemble one another in the presence of a clearly precingular type P (3``) archaeopyle and in the similar arrangement of the large and small processes; but they differ in the presence in Neoeurysphaeridium of an apical protrusion and the variability in size and shape of especially the precingular and postcingular processes; the basal delimitations of the large processes are much better defined than in Achilleodinium. Florentinia Davey and Verdier, 1973 emend. Duxbury, 1980 is defined by a type variable tA+P or P archaeopyle, but the species in that genus which have a type P archaeopyle differ from Neoeurysphaeridium in the absence of the apical protrusion and the presence of fissures between the apical and precingular paraplates. Hystrichokolpoma Klumpp, 1953 differs very clearly from Neoeurysphaeridium in its apical archaeopyle.
[Neoeurysphaeridium, Slimani, 1994, p. 77-78
According to Slimani (1994, p.77) this may be the taxonomic senior synonym of Eurysphaeridium (name not validly published). However, Eurysphaeridium has no formal type, and the other specific epithet assigned to Eurysphaeridium has been synonymized with another genus.
Type species: Neoeurysphaeridium glabrum, Slimani, 1994 (pl.13, figs.1–4; text-figs.12A–B)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Slimani, 1994]: (Translation: LPP):
Diagnosis:
Skolochorate, gonyaulacoid cyst. The central body is subsphaeroidal to ellipsoidal, lacks parasutural reliefs and bears an apical protrusion and intratabular processes. The precingular and postcingular processes, one per plate, are tubular, very large, closed or open distally, and occupy nearly the complete intratabular surface, whereas the apical, paracingular, parasulcal and antapical processes are smaller, narrower, simple solid or hollow. The antapical process and/or rare (1 to 3) precingular and postcingular processes often undergo a change of size and shape. The periphragm and endophragm are appressed between the processes.
The paratabulation is gonyaulacoid, conform the following formula: 4`, 5``, 6c, 4-5``, 3-5s, 1p, 1````.
The archaeopyle is precingular type P (3`` only), the operculum is free.
The paracingulum and parasulcus are generally indicated by 2 to 3 simple processes per plate.
Affinities:
Neoeurysphaeridium and Achilleodinium Eaton, 1976 are resemble one another in the presence of a clearly precingular type P (3``) archaeopyle and in the similar arrangement of the large and small processes; but they differ in the presence in Neoeurysphaeridium of an apical protrusion and the variability in size and shape of especially the precingular and postcingular processes; the basal delimitations of the large processes are much better defined than in Achilleodinium. Florentinia Davey and Verdier, 1973 emend. Duxbury, 1980 is defined by a type variable tA+P or P archaeopyle, but the species in that genus which have a type P archaeopyle differ from Neoeurysphaeridium in the absence of the apical protrusion and the presence of fissures between the apical and precingular paraplates. Hystrichokolpoma Klumpp, 1953 differs very clearly from Neoeurysphaeridium in its apical archaeopyle.