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Baltograptus deflexus

Pterobranchia - Didymograptidae

Didymograptus deflexus was named by Elles and Wood (1908).

It was recombined as Corymbograptus deflexus by Strachan (1981); it was recombined as Didymograptus (Corymbograptus) deflexus by Toro (1994); it was recombined as Baltograptus deflexus by Toro and Maletz (2008) and Rushton (2011).

Synonymy list
YearName and author
1908Didymograptus deflexus Elles and Wood
1981Corymbograptus deflexus Strachan p. 20
1994Didymograptus (Corymbograptus) deflexus Toro figs. pl. 2 f. 5, 9, 14
2008Baltograptus deflexus Toro and Maletz
2011Baltograptus deflexus Rushton pp. 322 - 323 figs. 2A, B, C?, D–L; 3

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phylumHemichordataBateson 1885
classPterobranchiaLankester 1877
classGraptolithina(Bronn 1849)
familyDidymograptidaeMu 1950
genusBaltograptusMaletz 1994
speciesdeflexus(Elles and Wood 1908)

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 2011Slender 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.