Stenodactylina strambergensis ( Bachmayer, 1959 )

Devillez, Julien & Charbonnier, Sylvain, 2021, Review of the Late Jurassic erymoid lobsters (Crustacea: Decapoda), Geodiversitas 43 (2), pp. 25-73 : 62

Stenodactylina strambergensis ( Bachmayer, 1959)

( Fig. 17 G-I)

Erymastacus strambergensis Bachmayer, 1959: 940 , pl. 2, fig. 2.

Phlyctisoma strambergensis – Förster 1966: 144, pl. 18, fig. 8.

Eryma strambergensis – Schweitzer et al. 2010: 24.

Stenodactylina strambergensis – Devillez et al. 2016: 524.

TYPE MATERIAL. — Holotype NMW 344/1959 . TYPE LOCALITY. — Stramberg , Moravian-Silesian, Czech Republic. TYPE AGE. — Tithonian .

DESCRIPTION

Thoracic appendages

Chelate P1; P1 propodus sub-rectangular, slightly globose dorso-ventrally; inner margin strongly compressed; rounded outer margin with a slight deviation at the basis of the index; slender index; wide and inflated dactylar bulge.

Ornamentation

P1 propodus covered by rounded, coarse and widely spaced tubercles; inner margin with a row of spines.

DISCUSSION

This species is known by some P1 propodi. Initially included within Erymastacus , then moved into Phlyctisoma (see Förster 1966) and Eryma (see Schweitzer et al. 2010), and finally to Stenodactylina by Devillez et al. (2016). This assignment is supported by the stronger compression of the inner margin than that of outer margin, the presence of a row of coarse tubercles on inner margin (present in most of the species of the genus), the strongly inflated dactylar bulge, and the fine basis of the index.

Because only the P1 propodus of this species is known, the comparisons with other species of Stenodactylina are limited. Stenodactylina strambergensis has the particularity to have a relatively short propodus. Moreover, the ornamentation of S. strambergensis is homogeneous – only made of coarse tubercles – contrary to other species, except S. armata and S. triglypta .

Figures

FIG. 17. — Stenodactylina pseudoventrosa (Beurlen,1928) n.comb.,Stenodactylina australis (Secrétan,1964) and Stenodactylina strambergensis (Bachmayer,1959): A, B, holotype GPIT Ar/294/3 of S. pseudoventrosa, n. comb. (Kimmeridgian, Hülben, Germany): general view (A), schema (B); C, D, holotype MNHN.F.R03972 of S. australis (Tithonian, north of Analavelona Massif, Madagascar): ventral view (C), dorsal view (D); E, F, specimen MNHN.F.A33228 of S. australis (Tithonian, Marolalitra, Madagascar):general view (E), schema (F); G, H, original figures of Bachmayer (1959: pl. 2, fig. 2b, c) of the holotype of S. strambergensis (Tithonian, Stramberg, Czech Republic); I, original figure of Bachmayer (1959: pl. 2, fig. 2a) of the paratype of S. strambergensis (Tithonian, Stramberg, Czech Republic). Abbreviations:a, branchiocardiac groove; b, antennal groove; b1, hepatic groove; c, postcervical groove; d, gastro-orbital groove; e1e, cervical groove; i, inferior groove. Photographs: A, J. Devillez; C, D, C. Lemzaouda; C, L. Cazes. Line drawings: J. Devillez. Scale bars: 1 cm.