Caryanthus trebecensis Knobloch and Mai, 1983

Heřmanová, Zuzana, Kvaček, Jiří, Dašková, Jiřina & Halamski, Adam T., 2020, Plant reproductive structures and other mesofossils from Coniacian / Santonian of Lower Silesia, Poland, Palaeontologia Electronica (a 61) 23 (3), pp. 1-23 : 8-10

Caryanthus trebecensis Knobloch and Mai, 1983

Figure 4 D-F

v1983 Caryanthus trebecensis Knobloch et Mai ; Knobloch and Mai, 1983, p. 309, pl. 8, figs.1-4, 10, 14.

v1986 Caryanthus trebecensis Knobloch et Mai ; Knobloch and Mai, 1986, p. 76, pl. 5, fig. 4.

v2006 Caryanthus trebecensis Knobloch et Mai ; Friis et al., 2006, p. 113.

v2012 Caryanthus sp. ; Heřmanová and Kvaček, 2012, p. 49, pl. 2, figs. A-G.

v2016 Caryanthus trebecensis Knobloch et Mai ; Heřmanová et al., 2016, p. 42, pl. 6, figs 1-12.

Holotype. Published by Knobloch and Mai (1983), pl. 8, figs. 1-3, stored in the National Museum Prague NMP F3873 , Late Cretaceous , Upper Turonian –Santonian, Branišov Br 21 borehole, 23.0– 23.5 m, Czech Republic.

Description. The specimen from Rakowice Małe locality is a slightly deformed fruit of ellipsoid shape ( Figure 4D ). Length 1.4 mm; breadth 1.0 mm. Apical part of the fruit concave; persistent perianth fused basally forming hypanthium, which covers the entire fruit ( Figure 4E ). Lateral faces of the fruit show two deeply sunken ridges running from the base to the apex. Surface covered with irregularly shaped thick-walled cells. Periclinal wall of cells sometimes collapsed ( Figure 4F ).

Remarks. The specimen from the Rakowice Małe locality is slightly longer than other fruits of Caryanthus trebecensis ( Heřmanová et al., 2016) . The apical part of the specimen described here is deformed, thus shape and position of tepals, usually attached on top of the hypanthium, are unclear.

Range. Late Coniacian or early Santonian age.

Occurrence. Rakowice Małe locality.

Material studied. K 2900; the material is housed in the National Museum Prague.

Figures

FIGURE 4. Caryanthus (A) Caryanthus communis broadly elliptical fruit, no. K2899; (B) Caryanthus communis apical part of fruit, no. K2899; (C) Caryanthus communis detail of epidermis, no. K2899 (D) Caryanthus trebecensis ribbed fruit, no. K2900; (E) Caryanthus trebecensis apical part of fruit, no. K2900; (F) Caryanthus trebecensis detail of epidermis, no. K2900; (G) Caryanthus sp. ribbed fruit, no. K2906; (H) Caryanthus sp. apical part of fruit, no. K2906; (I) Caryanthus sp. detail of epidermis, no. K2906; (J) Caryanthus sp. X-ray image, longitudinal/lateral section of fruit, no. K2906; (K) Caryanthus sp. X-ray image, transversal section of fruit, no. K2906; (L) Caryanthus sp. X-ray image longitudinal/adaxial-abaxial section of fruit, no. K2906. Scale bar for all images 0.1 mm. All specimens from Rakowice Małe locality.