Stenodactylina granulifera (Secretan 1964)
- Dataset
- Review of the Late Jurassic erymoid lobsters (Crustacea: Decapoda)
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Decapoda
- family
- Erymidae
- genus
- Stenodactylina
- species
- Stenodactylina granulifera
description
DESCRIPTION Carapace Sub-cylindrical carapace; fusiform intercalated plate; narrow post-orbital area; wide cephalic region; deep and wide cervical groove, strongly inclined, joined to dorsal margin and to antennal groove; deep and narrow antennal groove; short, shallow gastro-orbital groove, oblique, originating as a slight median inflexion of cervical groove; inferior gastro-orbital lobe slightly inflated; postcervical and branchiocardiac grooves subparallel; deep postcervical groove, strongly inclined and curved forward, joined to dorsal margin and interrupted in hepatic region; deep branchiocardiac groove, slightly curved forward, joined to dorsal margin and to hepatic groove; hepatic groove concavo-convex, joined to cervical groove; ω and χ areas slightly inflated; deep, wide inferior groove, joined to hepatic groove. Pleon and uropods Somites with subtriangular pleurites, with a longitudinal bulge on their basis. Thoracic appendages Elongated P 2 - P 5 merus. Ornamentation Carapace densely covered by small tubercles preceded by depressions, the tubercles are coarser along the intercalated plate; pleonal somites densely covered by small rounded depressions; P 2 - P 5 merus covered by small rounded and widely spaced depressions.
discussion
DISCUSSION This species was described from a carapace firstly assigned to Eryma (Secrétan 1964). A second species, E. madagascariensis Secrétan, 1964, based on a carapace connected to a fragment of pleon was also described (Fig. 16 J). The review of the decapod crustaceans of Madagascar by Charbonnier et al. (2012 a) concluded to the synonymy between Eryma granuliferum and E. madagascariensis because of their very close carapace groove pattern. Later, Devillez et al. (2016) assigned E. granuliferum to Stenodactylina because of the absence of junction between the postcervical and branchiocardiac grooves and the interruption of the postcervical groove in hepatic region. In addition to the carapace groove pattern, the slight inflation of ω and χ areas, and the ornamentation made of small tubercles preceded by depressions support the synonymy between S. granulifera and E. madagascariensis. Both ω and χ areas are inflated in Stenodactylina granulifera, contrary to S. australis, S. delphinensis, S. deslongchampsi, S. shotoverigiganti n. sp., S. triglypta, and S. walkerae. S. granulifera is one of the species within the genus, with S. walkerae, to exhibit an inflated gastro-orbital lobe. Its thin ornamentation is also distinct from that of S. australis, S. granulifera, S. lagardettei, S. pseudoventrosa, S. shotoverigiganti n. sp., S. triglypta, and S. walkerae.
materials_examined
TYPE MATERIAL. — Holotype MNHN. F. R 03975. TYPE LOCALITY. — East of Antsalova, Maintirano region, Tulear province, Madagascar. TYPE AGE. — Kimmeridgian.