Stenodactylina Beurlen, 1928

Devillez, Julien & Charbonnier, Sylvain, 2021, Review of the Late Jurassic erymoid lobsters (Crustacea: Decapoda), Geodiversitas 43 (2), pp. 25-73 : 58

Genus Stenodactylina Beurlen, 1928

( Fig. 1 J-L)

Stenodactylina Beurlen, 1928: 175 . — Glaessner 1969: 456. — Schweigert 2013: 411. — Devillez et al. 2016: 522 , figs 1D-F.

Erymastacus Beurlen, 1928: 171 (pars.). — Secrétan 1964: 71. — Glaessner 1969: 456 (pars.). — Hyžný et al. 2015: 375.

TYPE SPECIES. — Stenodactylina liasina Beurlen, 1928 , by monotypy.

DIAGNOSIS BY Devillez & Charbonnier (2019). — Fusiform intercalated plate; narrow post-orbital area; deep, very wide cervical groove, joined to dorsal margin and to antennal groove; short gastro-orbital groove originating as a slight median inflexion of cervical groove; postcervical and branchiocardiac grooves nearly parallel; narrow postcervical groove, not joined to branchiocardiac groove and interrupted in hepatic region; branchiocardiac groove strongly inclined, joined to hepatic groove; hepatic groove concavo-convex, joined to cervical groove; inferior groove convex posteriorly, joined to hepatic groove; chelate P1; P1 propodus rectangular or trapezoidal, with inner margin more compressed than outer margin, with a wide dactylar bulge; P1 with extremely long and slender fingers, equal in length; P1 chela (form I; Fig. 1K ) with strong, rectangular or trapezoidal propodus, bearing straight or sinuous fingers, strongly narrowing immediately after their basis; outer margin convex at the basis of the index; P1 chela (form II; Fig. 1L ) with trapezoidal propodus, outer margin straight or convex, straight fingers, narrowing gradually to their distal extremity.

Figures

FIG. 1. — Carapace and P1 chela morphologies of the Late Jurassic erymoids: A, regions of the carapace; B, morphology of a chela of the first pair of pereiopods; C, typical carapace groove pattern of Eryma; D, form I of chela of the first pair of pereiopods of Eryma; E, form II of chela of the first pair of pereiopods of Eryma; F, typical carapace groove pattern of Palaeastacus; G, typical chela of the first pair of pereiopods of Palaeastacus; H, typical carapace groove pattern of Pustulina; I, typical chela of the first pair of pereiopods of Pustulina; J, typical carapace groove pattern of Stenodactylina; K, form I of chela of the first pair of pereiopods of Stenodactylina; L, form II of chela of the first pair of pereiopods of Stenodactylina; F, typical carapace groove pattern of Enoploclytia; G, typical chela of the first pair of pereiopods of Enoploclytia. Abbreviations: a, branchiocardiac groove; ar, antennal region; b, antennal groove; b1, hepatic groove; br, branchial region; c, postcervical groove; cr, cardiac region; d, gastro-orbital groove; e1e, cervical groove; gr, gastric region; hr, hepatic region; i, inferior groove; ip, intercalated plate; PoA, post-orbital area; pr, pterygostomial region; χ, attachment site of adductor testis muscle; ω, attachment site of mandibular muscle. Line drawings: J. Devillez.