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- Title
The Anatomy of Melanodrymia aurantiaca Hickman, a Coiled Archaeogastropod from the East Pacific Hydrothermal Vents (Mollusca, Gastropoda).
- Authors
Haszprunar, Gerhard
- Abstract
The anatomy of Melanodrymia aurantiaca Hickman, 1984, a coiled archaeogastropod from the East Pacific hydrothermal vents, is described based on reconstructions of paraffin and semi-thin section series. Whereas the large protoconch with net-like sculpture and the lack of a secondary larval shell, the bipectinate gill lacking skeletal rods, the rhipidoglossate rasdula and in particular the hypoathroid nervous system with pedal cords reflect an archaeogastropod level of organization, the single set of pallial organs, the monotocard heart, the single left kidney, the glandular gonoduct and internal fertilization indicated by penis (males) and receptaculum (females) resemble conditions of higher streptoneurans. The latter similarities are regarded as convergences, however. The unique combination of primitive and advanced features as well as specific peculiarities (e.g. neural sexual dimorphism) prevents an inclusion of Metanodrymia aurantiaca in any of the known archaeogastropod groups. Based on similarity of snout formation and similar radula type several other recently described archaeogastropods (Peltospiroidea) are possibly related to M. aurantiaca
- Subjects
GASTROPODA; MOLLUSKS; HYDROTHERMAL vents; ARCHAEOGASTROPODA; SEXUAL dimorphism in animals; FERTILIZATION (Biology)
- Publication
Acta Zoologica, 1989, Vol 70, Issue 3, p175
- ISSN
0001-7272
- Publication type
Article
- DOI
10.1111/j.1463-6395.1989.tb01068.x