Szaboa lamarei, Schweitzer & Feldmann, 2010

Schweitzer, Carrie E. & Feldmann, Rodney M., 2010, New fossil decapod crustaceans from the Remy Collection, Muséum national d’Histoire naturelle, Paris, Geodiversitas 32 (3), pp. 399-415 : 406-407

publication ID	https://doi.org/ 10.5252/g2010n3a3
persistent identifier	https://treatment.plazi.org/id/815F8783-F964-FFDB-D8FD-FD59FE3CB470
treatment provided by	Felipe
scientific name	Szaboa lamarei
status	sp. nov.

Treatment

Szaboa lamarei View in CoL n. sp. ( Fig. 1F View FIG )

TYPE MATERIAL. — Holotype (carapace; MNHN R03779, coll. Remy).

MEASUREMENTS. — Measurements (in mm) taken on the holotype and sole specimen of Szaboa lamarei n. sp.: maximum carapace width = 20.3; maximum carapace length = 19.3; fronto-orbital width = 11.3; posterior width = 6.3; length to position of maximum width = 6.7.

ETYMOLOGY. — Th e trivial name is that used by Jean- Marcel Remy on the label but that was never published, in honour of Pierre Lamare (French geologist).We honor the work of both geologists by using Remy’s intended name.

TYPE LOCALITY. — Monségur, Gironde, Rupelian, Calcaire à Astéries Formation.

DIAGNOSIS. — Outer-orbital spines triangular, directed forward; carapace swellings large; lower orbital margin with large swelling.

DESCRIPTION

Carapace obovate, about as wide as long, length about 95% maximum carapace width, widest about 35% the distance posteriorly on carapace at about level of posterior edge of protogastric regions; flattened transversely and moderately vaulted longitudinally.

Front abraded, broken. Orbits wide, outer orbital spine triangular, directed forward; upper orbital margin sinuous; lower orbital margin extending well anterior of upper orbital margin, with central swelling. Anterolateral margins with several rounded spines, at least one with granular ornament. Posterolateral margin weakly concave, probably weakly rimmed. Posterior margin narrow, about 30% maximum carapace width, weakly rimmed.

Epigastric region weakly inflated, spherical.Protogastric regions triangular, apex directed posteriorly, with transverse swelling centrally. Mesogastric region with weak anterior extension, highly inflated posteriorly. Urogastric region depressed below level of mesogastric and cardiac regions. Cardiac region most inflated of all regions, produced into conical elevation. Intestinal region very long, not well differentiated. Hepatic region small, flattened. Epibranchial region with large spherical swelling centrally.Remainder of branchial regions undifferentiated, with small swelling just adjacent to posterolateral margin.

Pterygostomial region with suborbital swelling.Remainder of carapace and appendages unknown.

DISCUSSION

Szaboa lamarei n. sp. is easily distinguished from the only other species in the genus, S. inermis , in possessing much larger carapace swellings and apparently larger anterolateral swellings, although the latter is difficult to determine because the sole specimen of S. lamarei is abraded. Th e features of the two species are essentially identical except that the ornamentation of S. lamarei is much more robust. Because the species of S. lamarei is an abraded mold of the interior, collection of additional material could provide more details of the morphology of this species.

The new species of Szaboa is accommodated within the Matutidae based upon its lower orbital margins extending well beyond the upper orbital margins, seen in extant species ( Galil & Clark 1994) and in Szaboa inermis ( Müller & Galil 1998: fig. 1); its obovate carapace that is about as wide as long; and its wide orbits that occupy most of the frontal margin of the carapace. Th e new species is superficially similar to species of Eriosachila Blow & Manning, 1996 , of the Aethridae Dana, 1851 , but Eriosachila petiti Blow & Manning, 1996 , the type species of the genus, has small orbits with a lower orbital margin that does not extend beyond the upper orbital margin and has well-defined carapace regions not typical of the Matutidae . Th us, the new species is best accommodated within the Matutidae .

Of the Matutidae , the new species is the only one of early Oligocene age. Eomatuta granosa is early Eocene in age, known from Italy ( De Angeli & Marchiori 2009). Th e other two fossil species are Miocene in age ( Müller & Galil 1998; Karasawa 2002). Th e occurrence extends the geographic range somewhat, although Szaboa inermis was already known from Hungary; thus, the probable range and distribution pathway to the current Indo-Pacific occurrences remains Tethyan.