Necronectes michelini (A. Milne-Edwards, 1861)

Ossó, Àlex & Gagnaison, Cyril, 2019, An appraisal of the Middle-Late Miocene fossil decapod crustaceans of the ‘ Faluns’ (Anjou-Touraine, France), Geodiversitas 41 (9), pp. 367-383 : 376-377

publication ID	https://doi.org/10.5252/geodiversitas2019v41a9
publication LSID	urn:lsid:zoobank.org:pub:32E3623C-C47B-4D42-B2EB-E2594D031349
DOI	https://doi.org/10.5281/zenodo.3705472
persistent identifier	https://treatment.plazi.org/id/03D187F1-907D-FFB7-FCF1-9AEE0A1E4727
treatment provided by	Valdenar (2020-03-06 17:21:09, last updated 2024-11-27 18:54:43)
scientific name	Necronectes michelini (A. Milne-Edwards, 1861)
status

Treatment

Necronectes michelini (A. Milne-Edwards, 1861) View in CoL ( Fig. 5 View FIG D-F)

Scylla michelini A. Milne-Edwards, 1861: 137 View in CoL , pl.3., figs 3-3A. — Couffon 1908: 3, 4, pl. 1, figs 6-10, pl. 2, figs 1, 2. — Schweitzer et al. 2006: 122; 2010: 110. — Karasawa et al. 2008: 106. — Emmerson 2017: 584.

Cancer View in CoL macrochelus – Millet 1854: 152 (non Desmarest, 1817).

Scylla cf. michelini View in CoL – Glaessner 1928: 184, 185.

Scylla View in CoL ? michelini – Glaessner 1929: 374.

Scylla View in CoL sp. ( cf. michelini View in CoL ) – Lőrenthey & Beurlen 1929: 178, pl. 15, figs 5, 6.

Necronectes michelini View in CoL – Glaessner 1933: 5-6. — De Angeli & Marangon 1992: 178, 179.

Scylla michelini View in CoL ? – Betancort et al. 2014: 345, pl. 1, figs K1-K2 (non I1-I2)

MATERIAL EXAMINED AND MEASUREMENTS (in mm). — Two dactyli. Right dactylus, ULB-SO-9: L = 41.38, H = 25. — Left dactylus (tip broken off), ULB-SO-10: L = 32.53, H = 15.52.

LOCALITY AND HORIZON. — ‘La Sonneterie’ quarry, Meigné-le- Vicomte (Maine-et-Loire). ‘Savignean facies’, Langhian-Serravallian (Middle Miocene).

DESCRIPTION

Right dactylus stout, gently curved forward; subrectangular in section with rounded upper angles; strong proximal knobstick molariform tooth followed by six serial rounded conical teeth of different sizes; rounded tip. Left dactylus stout, gently curved forward; subrectangular in section with rounded upper angles, proximal tooth and tip not preserved.

REMARKS

Scylla michelini was erected based on fragmentary chelipeds and was referred to Scylla De Haan, 1833 , because of its similarity to the strong chelipeds of the extant S. serrata ( Forskål, 1775) . Nevertheless, A. Milne-Edwards (1861: 136), pointed out the absence in S. michelini of the two typical distinct spines on the distal upper part of the palm, near the insertion of dactylus (see Couffon 1908: pl. 1, figs 6-10, t. 2, figs 1, 2; MNHN.F.B25950, which are present in Scylla species (e.g. Keenan et al. 1998; Trivedi & Vachhrajani 2013). Rathbun (1918: 168), when described Necronectes proavitus (as Gatunia proavita), pointed out as well, the absence of those spines as a differential trait with Scylla , and also noted the striking similarity between the cheliped of N. proavitus and that of S. michelini ( Rathbun 1918: 171) . Furthermore, A. Milne-Edwards (1861: 136) noted as well, that the upper margin of the palm of S. michelini is rounded, whereas it is usually more flattened and angled in Scylla species (see Keenan et al. 1998: fig. 8).

Subsequently, several authors assigned similar fragmentary remains of dactyli y to Scylla michelini (see synonym list). Glaessner (1933: 5), included S. michelini within Necronectes A. Milne-Edwards, 1881 , being followed by De Angeli & Marangon (1992: 178, 179). Nevertheless, this placement was questioned by Schweitzer et al. (2006: 121, 122), which retained S. michelini within Necronectes (see also Karasawa et al. 2008: 106).

The aforementioned differences in the palms, such as the absence of the outer and inner spines on distal margin, and the strong spine at carpal articulation of propodus, further, the absence of spines on the outer part of carpus, peculiar of the most species of Scylla possesses (e.g. Keenan et al. 1998: fig. 8; Trivedi & Vachhrajani 2013: fig. 5a-c), allow us to confirm the generic placement of S. michelini within Necronectes , as it was previously placed by Glaessner (1928, 1933).

References

BETANCORT J. F., LOMOSCHITZ A. & MECO J. 2014. - Mio-Pliocene crustaceans from the Canary Islands, Spain. Rivista Italiana di paleontologia e Stratigrafia 120 (3): 337 - 349.

COUFFON O. 1908. - Sur quelques crustaces des faluns de Touraine et d'Anjou suivi d'un essai de Prodrome des Crustaces podophthalmaires miocenes. La Feuille des jeunes Naturalistes 39: 1 - 40. https: // biodiversitylibrary. org / page / 43027551

DE HAAN W. 1833 - 1850. - Crustacea, in VON SIEBOLD P. F. (ED.), Fauna Japonica sive Descriptio Animalium, quae in Itinere per Japoniam, Jussu et Auspiciis Superiorum, qui summum in India Batava Imperium Tenent, Suscepto, Annis 1823 - 1830 Collegit, Notis, Observationibus et Adumbrationibus Illustravit. J. Muller et Co., Leyden, i-xvii, i-xxxi, ix-xvi: 1 - 243. https: // doi. org / 10.5962 / bhl. title. 124951

DE ANGELI A. & MARANGON S. 1992. - Necronectes schafferi Glaessner nel Miocene della Sardegna, Italia. Lavori Societa Veneziana di Scienze Naturali 17: 175 - 182.

EMMERSON W. D. 2017. - A Guide to, and Checklist for, the Decapoda of Namibia, South Africa and Mozambique. Volume 2. Cambridge Scholars Publishing, Cambridge, 650 p.

FORSKAL P. 1775. - Descriptiones animalium, avium, amphibiorum, piscium, insectorum, vermium; quae in itinere orientali observavit. Petrus Forskal, Molleri, Hafniae, Copenhagen, 164 p. https: // doi. org / 10.5962 / bhl. title. 2154

GLAESSNER M. 1928. - Die Dekapodenfauna des Osterreichischen Jungtertiars. Jahrbuch der Geologischen Bundesanstalt 78: 161 - 219.

GLAESSNER M. F. 1929. - Crustacea, Decapoda, in POMPECKJ F. J. (ed.), Fossilium Catalogus. I: Animalia. Part. 41. W. Junk, Berlin, 464 p.

GLAESSNER M. F. 1933. - New Tertiary crabs in the collection of the British Museum. Annals and Magazine of Natural History, Series 10, 12 (67): 1 - 28.

KARASAWA H., SCHWEITZER C. E. & FELDMANN R. M. 2008. - Revision of the Portunoidea Rafinesque, 1815 (Decapoda: Brachyura) with emphasis on the fossil genera and families. Journal of Crustacean Biology 28 (1): 82 - 127. https: // doi. org / 10.1651 / 07 - 2882 R. 1

KEENAN C. P., DAVIE P. J. F. & MANN D. L. 1998. - A revision of the genus Scylla De Haan, 1833 (Crustacea: Decapoda: Brachyura: Portunidae). The Raffles Bulletin of Zoology 46 (1): 217 - 245.

LORENTHEY E. & BEURLEN K. 1929. - Die fossilen Decapoden der Lander der Ungarischen Krone. Geologica Hungarica, Series Palaeontologica 3: 1 - 420.

MILLET P. A. 1854. - Paleontologie de Maine et Loire. Cosnier et Lachese, Angers, 187 p. https: // doi. org / 10.5962 / bhl. title. 15140

RATHBUN M. J. 1918. - Decapod crustaceans from Panama, in VAUGHAN T. W. (ed.), Contributions to the geology and paleontology of the Canal Zone, Panama and geologically related areas in Central America and the West Indies. United States National Museum Bulletin 103: 123 - 184. http: // www. biodiversitylibrary. org / page / 32168508

SCHWEITZER C. E., ITURRALDE- VINENT M., HETLER J. H. & VELEZ- JUARBE J. 2006. - Oligocene and Miocene decapods (Thalassinidea and Brachyura) from the Caribbean. Annals of Carnegie Museum 75 (2): 111 - 136. https: // doi. org / 10.2992 / 00 97 - 4463 (2006) 75 [111: OAMDTA] 2.0. CO; 2

SCHWEITZER C. E., FELDMANN R. M., GARASSINO A., KARASAWA H. & SCHWEIGERT G. 2010. - Systematic list of fossil decapod crustacean species. Crustaceana Monograph 10: 1 - 1222. https: // doi. org / 10.1163 / ej. 9789004178915. i- 222

TRIVEDI J. N. & VACHHRAJANI K. D. 2013. - Taxonomic account of genus Scylla (de Haan, 1833) from Gujarat State, India with two new records of species. Arthropods 2 (4): 159 - 171.

YANAKEVICH A. N. 1977. - Middle Miocene reefs of Moldavia. Stiinca, Kishinev, 116 p (in Russian).

Figures

FIG. 5. — A, B, Liocarcinus sp., MS2012 0 172b: A, dorsal view; B, frontal view; C, D, Necronectes michelini (A. Milne-Edwards, 1861): C, ULB-SO-9, right dactylus; D, ULB-SO-10, left dactylus; E, Paguristes gagnaisoni Gagnaison, 2012, MS2006 FS 134b, right chela; F-I, Xantho cf. moldavicus (Yanakevich, 1977): F, ULB-SO-11, left chela, inner lateral view; G, outer lateral view; H, ULB-SO-12, left chela, outer lateral view; I, frontolateral view; J-M, undetermined chelae: J, ULB-SO-13, lateral view of right chela; K, frontal view; L, ULB-SO-14, lateral view of left chela; M, close-up showing an encrusted colony of bryozoans. Scale bars: A, B, 5 mm; C-M, 10 mm. Photographs by À. Ossó.