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Mendicodinium granulatum
Mendicodinium granulatum Kumar, 1986
Holotype: Kumar, 1986, pl.3, fig.6
Locus typicus: Kachchh, India
Stratum typicum: Kimmeridgian-Tithonian
Original diagnosis: Kumar, 1986, p.393
Proximate, subsphaerical, elongate ovoidal cyst with epicystal archaeopyle. Autophragm scabrate to granulate.
Original description: Kumar, 1986, p.393
These are proximate, subsphaerical, elongate--ovoidal cysts. Paratabulation features are essentially lacking. No indication of paracingulum or parasulcus. The autophragm is scabrate to granulate. The archaeopyle is epicystal, both the epicyst and hypocyst are attached. This attachment may be either partial at one end or it extends over more than half of the margin of the epicyst and hypocyst. The archaeopyle divides the cyst into two unequal halves, the hypocyst is always larger than the epicyst.
Dimension: Based on five specimens. Maximum diameter of cyst= 78.0-89.0 Ám.
Affinities:
Kumar, 1986, p.393: M. granulatum differs from M. reticulatum Morgenroth (1970) in being granulate to scabrate rather than reticulate. M. woodhamensis Drugg (1978) has a smooth autophragm, and M. groenlandicum (Pocock and Sarjeant) Davey (1979b) also has a smooth autophragm, but may also exhibit slight pitting or punctae. Drugg (1978) indicated that M. woodhamensis resembles Thuledinium groenlandicum Pocock and Sarjeant (1972), but due to different morphological interpretation by Pocock and Sarjeant (1972), he (Drugg, 1978) considered the seeming resemblance to be illusory. Later Davey (1979b) transferred the acritarch genus Thuledinium Pocock and Sarjeant (1972) to the dinoflagellate genus Mendicodinium Morgenroth (1970) and proposed a new combination M. groenlandicum.
Holotype: Kumar, 1986, pl.3, fig.6
Locus typicus: Kachchh, India
Stratum typicum: Kimmeridgian-Tithonian
Original diagnosis: Kumar, 1986, p.393
Proximate, subsphaerical, elongate ovoidal cyst with epicystal archaeopyle. Autophragm scabrate to granulate.
Original description: Kumar, 1986, p.393
These are proximate, subsphaerical, elongate--ovoidal cysts. Paratabulation features are essentially lacking. No indication of paracingulum or parasulcus. The autophragm is scabrate to granulate. The archaeopyle is epicystal, both the epicyst and hypocyst are attached. This attachment may be either partial at one end or it extends over more than half of the margin of the epicyst and hypocyst. The archaeopyle divides the cyst into two unequal halves, the hypocyst is always larger than the epicyst.
Dimension: Based on five specimens. Maximum diameter of cyst= 78.0-89.0 Ám.
Affinities:
Kumar, 1986, p.393: M. granulatum differs from M. reticulatum Morgenroth (1970) in being granulate to scabrate rather than reticulate. M. woodhamensis Drugg (1978) has a smooth autophragm, and M. groenlandicum (Pocock and Sarjeant) Davey (1979b) also has a smooth autophragm, but may also exhibit slight pitting or punctae. Drugg (1978) indicated that M. woodhamensis resembles Thuledinium groenlandicum Pocock and Sarjeant (1972), but due to different morphological interpretation by Pocock and Sarjeant (1972), he (Drugg, 1978) considered the seeming resemblance to be illusory. Later Davey (1979b) transferred the acritarch genus Thuledinium Pocock and Sarjeant (1972) to the dinoflagellate genus Mendicodinium Morgenroth (1970) and proposed a new combination M. groenlandicum.