Table 1 Morphological comparison of Gambierdiscus excentricus records
Canary Islands1 | Brazil2 | Madeira3 | |
|---|---|---|---|
Sampling site | 28° 34.62′N | 22° 45.3′S | 32° 38.17′N |
16°19.7′W | 41°54.12′W | 16° 56.11′W | |
Cell shape | lenticular | lenticular | lenticular |
Cell compression | anterio-posteriorly | anterio-posteriorly | anterio-posteriorly |
Cell size | |||
depth [μm] | 84–115 | 60–95 | 95–105 |
width [μm] | 69–110 | 53–91 | 100–110 |
thecal ornamentation | smooth with pores | smooth with pores | smooth with pores |
plate formula | Po 3′ 7′′ 6c ?s 5′′′ 2′′′′ | Po 3′ 7′′ 6c 8s? 5′′′ 2′′′′ | Po 3′ 7′′ ?c 4+s 5′′′ 2′′′′ |
APC | |||
location | ventrally displaced | ventrally displaced | ventrally displaced |
apical pore | fishhook-shaped slit | fishhook-shaped slit | fishhook-shaped slit |
marginal pores | one row | one row | irregular |
Plate 2′ | ~ rectangular | ~ rectangular | ~ rectangular |
Ratio 2′/3′ to 2′/1′ | ~ 2 | 2.2–2.6 | ~ 2 |
Plate 2′′′′ | narrow | narrow | narrow to wide |