Atlantocarpus sp.
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publication ID |
https://doi.org/ 10.37520/fi.2020.023 |
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persistent identifier |
https://treatment.plazi.org/id/6435F619-7869-3A4D-FBC8-D58A841D65DB |
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treatment provided by |
Diego |
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scientific name |
Atlantocarpus sp. |
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Text-fig. 5e, f View Text-fig
1997 Cone-like structure associated with Anacostia at the Buarcos locality; Friis et al., fig. 10.
D e s c r i p t i o n a n d r e m a r k s. A single, multicarpellate floral structure from the Buarcos locality, Portugal (S105025, Buarcos sample 244), closely resembles Atlantocarpus virginiensis from the Puddledock locality.
The specimen is about 1.9 mm long, 3.2 mm long including the long stalk ( Text-fig. 5e View Text-fig ). As in A. virginiensis the floral structure is preserved at an early developmental stage and internal features are not known for this specimen. The remains of tepals are bent over the basal part of the receptacle at the level of the collar obscuring any stamens, if they were present.
The floral receptacle is elongate conical ( Text-fig. 5e, f View Text-fig ) and the gynoecium is apocarpous consisting of about 40 spirally arranged carpels. The carpels are slightly flattened laterally and slightly swollen at the apex, probably reflecting an expanded stigmatic region. As in Atlantocarpus virginiensis , this distal portion of the carpels sometimes appears grooved and indistinctly bifid ( Text-fig. 5f View Text-fig ). The Buarcos fossil closely resembles Atlantocarpus virginiensis from the Puddledock flora and differs mainly in the number of carpels: about 50 in Atlantocarpus virginiensis and about 40 in Atlantocarpus sp. The specimen is not sufficiently distinctive to be assigned to a new species, and we assign it to the same genus as Atlantocarpus sp.
Another possibly related fossil from the Vale de Água locality (S101300, Vale de Água sample 141) consists of an elongated receptacle with about 40 spirally arranged scars, probably from abraded or shed carpels ( Text-fig. 5g View Text-fig ). The pedicellate structure is very similar in shape to Atlantocarpus sp. from Buarcos, but larger, about 2.5 mm long without the stalk, and may represent a later developmental stage of an Atlantocarpus -like flower. It is here referred to as Atlantocarpus ? sp.
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