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Arpylorus
From Williams et al., 2017:
[Arpylorus, Calandra, 1964, p. 4114; Emendations: Sarjeant, 1978b, p. 173
Genus of possible annelid or arthropod eggs.
Type species: Arpyrolus antiquus, Calandra 1964 (fig.1)] ; emend. Sarjeant, 1978
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Original description: [Calandra, 1964]: (Translation: Stover and Evitt, 1978, p. 95):
Description:
Shell of organic material, ovoidal, provided with a lateral, quadrangular archeopyle, occasionally with rounded or truncated upper angles; shell
bearing vestiges of polar, membranous expansions.
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Modified description:
Stover and Evitt, 1978, p. 96:
Synopsis:
Cyst proximate, compressed ovoidal, with the apical end more narrowly rounded than the antapical end; autophragm vermiculate; vestiges of parasutural septa may be present; archaeopyle intercalary, Type I
Description:
Shape: Compressed ovoidal, outline in dorsal-ventral view subquadrangular with straight to slightly convex sides, a moderately rounded apex and a broadly rounded to trunctated antapex.
Wall relationships: Autophragm only.
Wall features: Parasutural features limited to incomplete septa at poles; autophragm vermiculate.
Paratabulation: Indicated by archeopyle, vestiges of parasutural septa, and tendency of wall to split along parasutures. Short precingular and several large intercalary paraplates indicated; formula uncertain.
Archeopyle: Intercalary, Type I: subrectangular, length greater than width; operculum free.
Paracingulum: Faintly indicated by surface texture and cracks in the wall.
Parasulcus: Not indicated.
Size: Large.
Affinities:
Only Paleozoic species with clear dinoflagellate characters: Arpylorus is similar in shape to Pyxidiella, from which it differs in being considerable larger and in having vestiges of parasutural septa.
[Arpylorus, Calandra, 1964, p. 4114; Emendations: Sarjeant, 1978b, p. 173
Genus of possible annelid or arthropod eggs.
Type species: Arpyrolus antiquus, Calandra 1964 (fig.1)] ; emend. Sarjeant, 1978
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Calandra, 1964]: (Translation: Stover and Evitt, 1978, p. 95):
Description:
Shell of organic material, ovoidal, provided with a lateral, quadrangular archeopyle, occasionally with rounded or truncated upper angles; shell
bearing vestiges of polar, membranous expansions.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Modified description:
Stover and Evitt, 1978, p. 96:
Synopsis:
Cyst proximate, compressed ovoidal, with the apical end more narrowly rounded than the antapical end; autophragm vermiculate; vestiges of parasutural septa may be present; archaeopyle intercalary, Type I
Description:
Shape: Compressed ovoidal, outline in dorsal-ventral view subquadrangular with straight to slightly convex sides, a moderately rounded apex and a broadly rounded to trunctated antapex.
Wall relationships: Autophragm only.
Wall features: Parasutural features limited to incomplete septa at poles; autophragm vermiculate.
Paratabulation: Indicated by archeopyle, vestiges of parasutural septa, and tendency of wall to split along parasutures. Short precingular and several large intercalary paraplates indicated; formula uncertain.
Archeopyle: Intercalary, Type I: subrectangular, length greater than width; operculum free.
Paracingulum: Faintly indicated by surface texture and cracks in the wall.
Parasulcus: Not indicated.
Size: Large.
Affinities:
Only Paleozoic species with clear dinoflagellate characters: Arpylorus is similar in shape to Pyxidiella, from which it differs in being considerable larger and in having vestiges of parasutural septa.