|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Pterobranchia - Didymograptidae
Is something missing? Join the Paleobiology Database and enter the data
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|A. W. A. Rushton 2011||Slender deflexed Baltograptus with artus-type development. Sicula 1.4–1.6 mm long, about 0.3 mm wide at the aperture, supradorsal part 0.7–1.0 mm long, free ventrally for 0.25–0.5 mm. Th 11 originates about 0.5 mm below the tip of the sicula and is the dicalycal theca, indicating artus-type development. All specimens appear to be right-handed, except Fig. 2C, the identification of which is accordingly doubtful. Stipe 1 at its origin is about 0.3 mm in diameter. The stipe at the aperture of th11 is about 0.6 mm wide and the stipes widen only gradually; they are less than 1 mm wide at th 4 or 5, where the stipes make the outward bend; they seldom exceed 1·0 mm in width distally. Thecal spacing distal of the outward bend is about 13 per 10 mm (2TRD around 1.6). The thecal inclination is up to about 30º.|