Hoploparia pusilla Secrétan, 1964

Charbonnier, Sylvain, Garassino, Alessandro & Pasini, Giovanni, 2012, Revision of Mesozoic decapod crustaceans from Madagascar, Geodiversitas 34 (2), pp. 313-357 : 313-357

Hoploparia pusilla Secrétan, 1964 ( Fig. 17 )

Hoploparia pusilla Secrétan, 1964: 109-112 , pl. 10, figs 3, 4. — Aguirre Urreta 1989: 519, 526. — Karasawa & Hayakawa 2000: 141. — Tshudy & Sorhannus 2003: 708, 709. — Garassino et al. 2009: 89. — Schweitzer et al. 2010: 30.

HOLOTYPE. — MNHN.F. R 03904.

PARATYPES. — From the “Coupe de Berere”: 2 specimens ( MNHN.F. R 03905, A31657, gisement 166). Menabe region, central Morondava Basin, Tulear Province.

TYPE LOCALITY. — Coupe de Berere (gisement 166), Belo-sur-Thsiribihina, Menabe region, central Morondava Basin, Tulear Province.

TYPE AGE. — Early Campanian.

ADDITIONAL MATERIAL EXAMINED. — 1 specimen ( MNHN.F.A33390, Coupe de Berere, gisement 166). Belo-sur-Thsiribihina, Menabe region, central Morondava Basin, Tulear Province.

DIAGNOSIS. — Cephalothorax with deep cervical groove starting at mid-height and joining the antennal groove; deep postcervical groove joining the well-marked hepatic groove; branchiocardiac and inferior grooves absent; gastric region with small spine; antennal region with tuberculate antennal carina; rostrum dorsally flat, flanked by two smooth lateral carinae, one strong, welldeveloped basal spine.

DESCRIPTION

Cephalothorax subcylindrical (CL = c. 19 mm, CH = c. 10 mm); rostrum dorsally flat with smooth margins and flanked by two smooth lateral carinae; one strong, well-developed basal spine; ocular incision shallow, delimited ventrally by the antennal spine; gastric region not delimited by the cervical groove, bearing one small spine located in the centre of the ocular incision; antennal region well demarcated by the cervical and antennal grooves, bearing a single postantennal spine aligned with the tuberculate antennal carina distally prolonged by the antennal spine; deep cervical groove starting at mid-height and joining the antennal groove; postcervical groove deep, slightly inclined, intercepting dorsal margin at an angle of c. 70°, starting in the first posterior ⅓ of the dorsal margin and clearly joining the well-marked hepatic groove; pterygostomial region strongly inflated; posterior margin slightly sinuous with a thin marginal carina; ornament uniformly finely tuberculate.

Abdomen with subrectangular somites; somites 1 and 6 smaller than the others; somites 2-5 of uniform length; terga and pleurae uniformly tuberculate; pleurae with weak depression; telson subrectangular with two pairs of carinae converging distally, ornament similar to that of somites. Pereiopods fragmentary, only one propodus with carinate inner margin.

DISCUSSION

Upon re-examination of the Malagasy material studied by Secrétan (1964), we agree with her generic attribution and with the erection of a new species. As pointed out by Secrétan (1964) and confirmed by our new observations, H. pusilla differs from H. collignoni in having a deep postcervical groove joining an equally deep hepatic one. Moreover, there is a difference in stratigraphic age between the two species.

Figures

FIG. 17. — Hoploparia pusilla Secrétan, 1964 from the Lower Campanian of Belo-sur-Thsiribihina, Menabe region, central Morondava Basin: A, holotype (MNHN.F.R03904, Coupe de Berere, gisement 166), cephalothorax in left lateral view, note finely tuberculate orna- ment; B-D, paratype (MNHN.F.R03905, Coupe de Berere, gisement 166), incomplete specimen in right lateral, dorsal and left lateral views, respectively, showing articulated cephalothorax and abdomen, note left propodus of P1 with carinate outer margin; E, line drawing by F. Fogliazza, left lateral view. Abbreviations: b, antennal groove; b1, hepatic groove; c, postcervical groove; e1e, cervical groove. Scale bars: 1 cm. Photographs by C. Lemzaouda (MNHN).