Paradorippe sp.

Guinot, Danièle, 2023, A new subfamily classification of the highly diversified Dorippidae H. Milne Edwards, 1837 (Crustacea, Decapoda, Brachyura, Dorippoidea), using morphological, molecular and palaeotonlogical data, with special emphasis on its unique female reproductive system, Zoosystema 45 (9), pp. 225-372 : 362

Paradorippe sp. cf. granulata and Paradorippe granulata (De Haan, 1841)

Dorippe granulata De Haan, 1841: 122 , pl. 3, fig. 2.

Paradorippe granulata – Morita 1977: 16, pl. 2, figs 5-8. — Kaneko 1958: 331, 332, 336, pl. 15, fig. 10. — Holthuis & Manning 1990: 125. — Kato & Karasawa 1998: 9, pls 3.10, 11, 13, 14. — Umemoto & Karasawa 1998: 11, fig. 8. — Kobayashi et al. 2008: 112, pl. 1, fig. 5. — Schweitzer et al. 2010: 80. — Klompmaker et al. 2013: 607, fig. 3J, K, tables 1, 3. — Karasawa et al. 2014: 61, fig. 7.3-7.6; 2021: 139, 146, pl. 2, figs 21-24 — Ando et al. 2015: 306, pl. 2.10; 2022: 232. — Sasaki 2019: 7803. — Van Bakel et al. 2020: fig. 10.37. — Schweitzer et al. 2021: 3, fig. 2.4a, b.

REMARKS

Chelae or only dactyli and fixed fingers of Paradorippe granulata have been recorded from the Middle Pleistocene of the Atsumi Group (Kobayashi et al. 2008; Karasawa et al. 2014, 2021), from the Middle Pleistocene Ogushi Formation, Japan (Klompmaker et al. 2013) and from the Late Pleistocene Ogushi Formation, Kyushu, Japan (Ando et al. 2015). Van Bakel et al. (2020: fig. 10.27) also reported it from the Pleistocene. Carapaces have been recorded from the Holocene Deposits in Osaka City, Honshu Island (Kaneko 1958: pl. 15, fig. 10) and Holocene deposits in the Shimizu Port, Shizuoka City, Japan (Ando et al. 2022: 132, pl. 2, figs B, C); carapaces with ventral parts have been well preserved in the Reclaimed Sand around the Nagoya Port, Honshu Island (Morita 1977: pl. 2, figs 5-8) and in the Nanyo Formation, Aichi Prefecture (Umemoto & Karasawa 1998: 11, fig. 8). All of these could well correspond to P. granulata ( Fig. 25A, B ), with a typical granulated carapace. Drill holes attributed to traces of predation by octopodes were found on the propodus by Klompmaker et al. (2013: fig. 3J-K). It is not surprising to find many Japanese fossil remains of the extant species P. granulata that is very common in Japan and has a wide distribution. The single fingers and the complete chela as for example in Kobayashi et al. (2008: pl. 1, fig. 5) and in Karasawa et al. (2014: fig. 7.3, 7.4; 2021: pl. 2, figs 21, 22) might not completely match the shape of the extant P. granulata whose fingers form a distinct curve with the palm, but this is probably due to the angle of the photographs. The carapace fragments in Karasawa et al. (2014: figs 7.5, 7.6; 2021: figs 23, 24) have a front with a median emargination that appears to be much more pronounced than in extant P. granulata but the granulation of the dorsal surface corresponds to that of this species ( Fig. 25A, B ). With regards to fragments of Paradorippe sp. cf. granulata found in the Pleistocene of the Boso Peninsula, Japan, the granular major chela of a male with an inflated palm and a short inclined fixed finger as well as the minor chela represented by Kato & Karasawa (1998: pl. 3, figs 10-11, 13-14, respectively) could be assigned to P. granulata ; this is also consistent with the sexual dimorphism encountered in the extant species as illustrated in our figures of the male ( Figs 24A ; 25A ) and female ( Fig. 24B ). The species belongs to the Paradorippinae n. subfam.

Figures

FIG. 25. — Paradorippinae n. subfam. Paradorippe granulata (De Haan, 1841): A, C, E, ♂ 24.0 × 26.0 mm, China, Tuandao, off Quingdao, MNHN-IU-2016-10753. B, D, ♂ 23.6 × 27.3 mm, NE Taiwan, I-Lan county, ZRC 2001.0014; A, chelae; B, thoracic sternum and pleon; C, D, thoracic sternum without pleon, with G1, G2 and press-buttons; E, G1 and G2 in situ.

FIG. 24. — Paradorippinae n. subfam. Paradorippe granulata (De Haan, 1841): habitus: A, ♂ 23.6 × 27.3 mm, NE Taiwan,I-Lan county, ZRC 2001.0014; B, ovigerous ♀ 23. 2 × 25.7 mm, Japan, off Hota, ZRC 1999.0082.