Gothograptus , Frech 1897
- Dataset
- Evolutionary significance of the retiolitine Gothograptus (Graptolithina) with four new species from the Silurian of the East European Platform (Baltica), Poland and Lithuania
- Rank
- GENUS
Classification
- kingdom
- Animalia
- phylum
- Hemichordata
- class
- Graptolithina
- order
- Graptoloidea
- family
- Retiolitidae
- genus
- Gothograptus
description
Species included. Gothograptus nassa (Holm, 1890); Gothograptus pseudospinosus (Eisenack, 1951), Gothograptus kozlowskii Kozłowska-Dawidziuk, 1990; Gothograptus obtectus Kozłowska-Dawidziuk, 1990; Gothograptus storchi Lenz & Kozłowska, 2006; Gothograptus auriculatus n. sp.; Gothograptus domeyki n. sp.; Gothograptus velo n. sp., Gothograptus diminutus n. sp.
diagnosis
Emended diagnosis. Streamlined shape of tubarium ended by appendix. Ancora umbrella with undulating rim. Sicula about 1.2 – 1.5 mm long. Proximal lateral and ventral orifices small, kidney-shaped on lateral side and triangular on ventral sides of tubarium. Lateral wall on reverse sides of tubarium built of stronger oblique lists, whereas obverse wall is composed of the nema and connecting rods. Semigothograptus and Neogothograptus differ from Gothograptus in having a free nema. Ventral wall composed of distinctive lips, genicular lists, pleural lists and mid-ventral lists. Singular genicular processes forming solid or reticulated hoods or veils, which may cover the thecal orifice and ventral wall of thecae. In mature specimens a dense and thick reticulum, very thick ancora lists, a thick sicular rim, and reticular structures surrounding the metasicula may occur.
discussion
Remarks. There are some problems with the designation of some Gothograptus species illustrated or described in the past. Jaeger illustrated and temporarily named, on an unpublished range chart for retiolitids, several species from North German glacial erratic boulders (Maletz 2008, fig. 1). These species were never described or published by Jaeger. Based on Jaeger‘s data Maletz (2008) regarded most of the species as nomina nuda or not identified. One of them, G. eximinassa was included in the genus Neogothograptus (Maletz 2008). The species G. praenassa was not identified. Later on Jaeger‘s G. gigantonassa was included in Semigothograptus meganassa (Rickards & Palmer, 2002) (Kozłowska 2016). According to Jaeger‘s drawing, the material that he referred to G. osgaleae may be included in G. obtectus, whereas the specimens described as G. nassa and G. pseudospinosus are properly designated (Kozłowska personal observation).
materials_examined
Type species. Retiolites nassa Holm, 1890, pl. 2, fig. 12, 13; NRM-PZ Cn 0025546 Type locality. Gotland, Sweden, Wenlock, upper Homerian, Gothograptus nassa Biozone (Holm, 1890).
Name
- Homonyms
- Gothograptus , Frech 1897