The evolution of the Haustorioidea of the world, and post-embryonic development, taxonomy and ecology of the Haustoriidae (Amphipoda-Crustacea) /
The Haustorioidea is proposed to be a monophyletic taxon
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739668001&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The Haustorioidea is proposed to be a monophyletic taxon evolving from the pontocaspian gammarids. A straight-line derivation through hypothesized intermediates was determined for Platyischnopidae, Phoxocephalidae and Urothoidae. An hypothesized urothoid-like ancestor gave rise to a haustoriid-condukiid and phoxocephalopsid-zobrachoid- urohaustoriid lineages. The hypothesized line of descent for the genera of Haustoriidae are (from most plesiomorphic to apomorphic): Protohaustorius, Neohaustorius, Parahaustorius, Lepidactylus and another ancestor, which independently evolved into an acanthohaustorius (Acanthohaustorius, Pseudohaustorius and Eohaustorius) and haustorius group of genera. The haustorius group evolved into Haustorius (arenarius and algeriensis), Genus one (canadensis), Genus two and Genus three. The latter new genera are from the Gulf of Mexico. Phylogenetic, evolutionary and phenetic results are compared using the same data base. Only the phenetic analysis gave nonevolutionary results. Also, an area cladograrn for the Haustorioidea and a habitat cladogram for the Haustoriidae is presented. The primary events impacting the vicariance of the Haustoriidae include a subtidal migration in the Late Mesozoic, a separation of particular taxa by the Euramerican land mass in the Late Cretaceous and the opening of the Suwanne Seaway in the Miocene. A method using the merus of pereopod 7 is presented for aging haustoriid amphipods. A "twin peak" monthly size-frequency pattern was observed, and Gulf haustoriids evidently molt either at new or full moon once a lunar month. Furthermore, development is deterministic with seven juvenile stages and two adult stages. The characteristics are given for the stages of each species examined. A key and diagnoses are presented for species of haustoriid amphipods of the Atlantic Ocean and Gulf of Mexico. In addition, included are descriptions of three newly erected genera and eleven new species from the Gulf. Ecologically, less contagious sampling results were obtained by elevation sampling; haustoriid amphipods and S. squamata partition the beach by age and species, and are strongly impacted by enhanced sediment size and vehicular traffic; and Genus two species c partitions the beach by sex. It appears from a demographic study that Genus two species c has juvenile stages which migrate from the beach in the summer and winter, and a type IV survivorship curve. |
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| Item Description: | Vita. "Major Subject: Zoology". |
| Physical Description: | 3 volumes (xxxvii-640 leaves) : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 455-472. |