Atlanta roseaRoger R. Seapy
- Shell moderately large (to 5 mm diameter)
- Shell transparent to faintly yellow
- Spire rounded, approximately globular in shape
- Spire consists of about 3-1/2 whorls, with suture separating the first 2-1/2 whorls very shallow; the result being a nearly smooth spire surface (see second SEM and larval shell photographs below)
- Keel inserts between penultimate and last whorls in shells larger than about 1.5 mm (see first SEM below) Click on an image to view larger version & data in a new windowClick on an image to view larger version & data in a new window
Figure. Scanning electron micrographs of the shell of Atlanta rosea viewed from the right side (left) and the central part of the spire (right). Shell diameter = 3.0 mm. From Richter (1993, figs. 4 and 8, respectively). © 1993 G. Richter
- Larval shell with somewhat elongatel aperture and rounded, globular spire
- Larval shell with a bright pink tinge, which immediately distinguishes it from the larvae of others in the Atlanta peronii species group (Richter and Seapy, 1999)
- Body coloration rose colored, as is the keel base (Souleyet, 1852). The following photograph was taken of a live specimen collected in Hawaiian waters and tentatively identified as A. peroni?; unfortunately it was not retained for later identification. I have subsequently suspected that it might be A. rosea because of the rose coloration of the body (particularly the spire region) and the keel base.
- Eyes type b
- Operculum type b
- Radula type II
Souleyet described Atlanta rosea (under the vernacular name Atlante rose) from specimens collected by the Bonite Expedition in the western Pacific Ocean. He regarded A. rosea as most closely related to A. peronii, citing a larger spire size in A. rosea, and naming the species on the basis of the rose color of the body and keel base. Tesch (1906, p. 10) reported A. rosea from samples collected during the Siboga Expedition to the East Indies. However, in his revision of the genus Atlanta in 1908, Tesch rejected A. rosea as a valid species, designating it as a junior synonym of A. peronii. Subsequent authors (notably Tesch, 1949 and van der Spoel, 1976) accepted Tesch's merger of A. rosea with A. peronii. But in a 1993 paper on the species comprising the A. peronii species group, Richter (1993) provided conclusive proof that Souleyet was correct in treating A. rosea as species distinct from A. peronii. The primary difference in the shells was in the rounded spire shape and shallow suture in the early spire whorls of A. rosea. These differences in the spires of A. rosea and A. peronii are clearly seen by Richter's dark field photographs of the larval shells of the two species in apertural view (see below).
Figure. Larval shells of Atlanta rosea (left) and A. peroni (right); apertural views of the shells using dark-field, transmitted light. From Richter (1993, figs. 4 and 1, respectively). © 1993 G. Richter
In a paper on the heteropods of the South Atlantic Ocean, Richter (in Richter and Seapy, 1999: 638) stated that "in 1908 Tesch united A. rosea with A. peroni probably because the holotypes in the Musee d'Histoire Naturelle de Paris were already badly damaged (shells dissolved) when he had the opportunity to study them. Comparing "aberrant" shells of A. peroni from the Indian Ocean and the tropical Atlantic Ocean with the type shells of Souleyet, preserved dry in the British Museum, London, Richter (1993) found that they belonged to this very species.
Richter, G. 1993. Zur Kenntnis der Gattung Atlanta (V). Die Atlanta peroni-Gruppe und Atlanta gaudichaudi (Prosobranchia: Heteropoda). Archiv fur Molluskenkunde 122: 189-205.
Richter, G. and R. R. Seapy. 1999. Heteropoda, pp. 621-647. In: D. Boltovskoy (ed.), South Atlantic Zooplankton. Leiden: Backhuys Publ.
Souleyet, [L. F. A.]. 1852. In: Eydoux, [F.] and Souleyet [L. F. A.], Voyage autour du monde execute pendant les annees 1836 et 1837 sur la corvette 'La Bonite'... Zoologie, col. 2. 664 pp. A. Bertrand, Paris.
Spoel, S. van der. 1976. Pseudothecosomata, Gymnosomata and Heteropoda (Gastropoda). Bohn, Scheltema & Holkema, Utrecht. 484 pp.
Tesch, J. J. 1906. Die Heteropoden der Siboga-Expeditie. Monographie 51, 112 pp. E. J. Brill, Leiden.
Tesch, J. J. 1908. Systematic monograph of the Atlantidae (Heteropoda) with enumeration of the species in the Leyden Museum. Notes from the Leyden Museum 30: 1-30, 5 plates.
Tesch, J. J. 1949. Heteropoda. Dana Report 34: 1-54.
Correspondence regarding this page should be directed to Roger R. Seapy at
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- First online 05 February 2010
- Content changed 05 February 2010
Citing this page:
Seapy, Roger R. 2010. Atlanta rosea http://tolweb.org/Atlanta_rosea/28771/2010.02.05 in The Tree of Life Web Project, http://tolweb.org/. Atlanta rosea . Version 05 February 2010 (under construction).