THE NAUTILUS 102(3):99-101, 1988 Page 99 A New Species of Macrarene (Turbinidae: Liotiinae) from Brazil James H. McLean Los Angeles County Museum of Natural Histor)- 900 Exposition Boulevard Los Angeles, California 90007, USA Ricardo Silva Absalao Renato Luiz dos Santos Cruz Departamento de Zoologia, Instituto de Biologia, CCS. Universidade Federal do Rio de Janeiro Ilha do Fundao, Rio de Janeiro, Brasil 21940 ABSTRACT The new species Macrarene digitate from the northeast Bra- zilian coast represents the first record of this principally eastern Pacific genus in the western Atlantic. The species had previ- ously been known from juvenile specimens reported as Liotia admirabilis E. A. Smith, the holotype of which is not a member of the subfamily Liotiinae. INTRODUCTION The species here described was first recognized as a mem- ber of the Brazilian fauna by Rios (1975, 1985), who referred it to Liotia admirabilis E. A. Smith, 1890. That species was described from the oceanic island of Saint Helena. According to the original description. Smith's species has a maximum dimension of I'A mm. The 15 syntypes were examined at the British Museum (Natural History) (catalogue numbers 1889.10.1.1554-68) by the senior author in 1984 and found to be similar (although not clearly referable) to the skeneiform genus Parviturbo Pilsbry & McGinty, 1945, which is not a member of the Liotiinae. The Brazilian species was clearly undescribed, but its true generic affinity was not readily apparent because the specimens available to Rios, which have been ex- amined by McLean (figure 2), were not mature and the expression of the mature lip was impossible to determine. More recently, two larger specimens have come to light and it can now be maintained that the species has the characters of the genus Macrarene Hertlein & Strong, 1951. Abbreviations for institutions are as follows: LACM, Los Angeles County Museum of Natural History; MORG, Museu Oceanografico, Universidade do Rio Grande, R.S., IBUFRJ, Instituto de Biologia, Universidade Federal do Rio de Janeiro. SYSTEMATICS Family Turbinidae Rafinesque, 1815 Subfamily Liotiinae H. & A. Adams, 1854 Shells of the subfamily are characterized by turbiniform to discoidal profiles, nacreous interiors, fine lamellar sculpture, intritacalx (calcified periostracum) in most genera, circular apertures, and multispiral opercula with calcareous beads. Radula like that of members of other turbinid subfamilies. Although previously treated by most authors as a full family, the Liotiinae have recently been ranked as a subfamily of Turbinidae by McLean (1987). Genus Macrarene Hertlein & Strong, 1951 Type species (original designation): Liotia californica Dall, 1908. Recent, off Baja California, Mexico. Macrarene species are characterized by turbinate white shells, broad umbilici, and presence of axial ribs and spiral cords that form spines at their intersections. Spac- ing of the axial ribs increases in the final whorl. In some species the ribs then become more closely spaced in the final quarter whorl. The final lip is not thickened at maturity. Some Macrarene species reach relatively large sizes. The genus differs from Arene in lacking shell pigmen- tation and in having the spacing of the axial sculpture increasingly separated as the shell matures. The white- shelled genus Liotia is smaller and retains tight spacing of the axial sculpture. The white-shelled, new world Liotiine genera Mac- rarene, Liotia, and Cyclostrema differ as a group from those of the Indo-Pacific and Australasian regions in lack- ing the thickened mature lips that characterize the gen- era Bathtjiiotina Habe, 1961, Liotina Fischer, 1885, Dentarene Iredale, 1929, and Austroliotia Cotton, 1948.



A new species of Macrarene (Turbinidae: Liotiinae)

Nautilus 102: 99-101 (1988)

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