Interest in the endemic Pisaster was first aroused by the great variation of external color in Pisaster ochraceus. This in turn led to observations of the diversity of the spinous patterns of this sea star. Following the suggestion of Dr. Jool D. hedgepeth it was decided to make an extensive comparison of the common species of Pisaster.
Detailed comparison between Pisaster brevispinus and Pisaster ochraceus have been made only by Fisher (1930) and Verrill (1914). Both of these investigators restricted their observations largely to the endoskeleton and its calcareous protuberances. In addition to analyzing the work of Fisher, an attempt to differentiate between the two species regarding behaviour, tolerances, gross anatomy and natural history has been made. In addition some mention of the relationships with other members of the family Asteriidae is recorded in this study.
","abstract_html":"<p>Interest in the endemic Pisaster was first aroused by the great variation of external color in Pisaster ochraceus. This in turn led to observations of the diversity of the spinous patterns of this sea star. Following the suggestion of Dr. Jool D. hedgepeth it was decided to make an extensive comparison of the common species of Pisaster.</p><p>Detailed comparison between Pisaster brevispinus and Pisaster ochraceus have been made only by Fisher (1930) and Verrill (1914). Both of these investigators restricted their observations largely to the endoskeleton and its calcareous protuberances. In addition to analyzing the work of Fisher, an attempt to differentiate between the two species regarding behaviour, tolerances, gross anatomy and natural history has been made. In addition some mention of the relationships with other members of the family Asteriidae is recorded in this study.</p>","abstract_has_math":false,"creators":["Mayer, Norman William"],"institution":null,"degree_name":"Master of Arts (M.A.)","degree_level":"Thesis","degree_discipline":"Biological Sciences","degree_department":null,"school":null,"contributors":["Joel W. Hedgpeth"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1963,"date_issued":"1963-01-01T08:00:00Z","date_published":"1963-01-01T08:00:00Z","updated_at":"2026-07-24T05:37:26Z","subjects":["Starfishes","Biology","Life Sciences"],"languages":[],"rights":[],"rights_urls":["http://rightsstatements.org/vocab/NKC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://scholarlycommons.pacific.edu/uop_etds/1548","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Joel W. Hedgpeth"]},{"key":"dc:creator","label":"Author","values":["Mayer, Norman William"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2018-06-29T08:41:51Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Biological Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Arts (M.A.)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Starfishes","Biology","Life Sciences"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["http://rightsstatements.org/vocab/NKC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarlycommons.pacific.edu/uop_etds/1548"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Interest in the endemic Pisaster was first aroused by the great variation of external color in Pisaster ochraceus. This in turn led to observations of the diversity of the spinous patterns of this sea star. Following the suggestion of Dr. Jool D. hedgepeth it was decided to make an extensive comparison of the common species of Pisaster.
Detailed comparison between Pisaster brevispinus and Pisaster ochraceus have been made only by Fisher (1930) and Verrill (1914). Both of these investigators restricted their observations largely to the endoskeleton and its calcareous protuberances. In addition to analyzing the work of Fisher, an attempt to differentiate between the two species regarding behaviour, tolerances, gross anatomy and natural history has been made. In addition some mention of the relationships with other members of the family Asteriidae is recorded in this study.
"]},{"key":"dc:source","label":"Dc Source","values":["128"]},{"key":"dc:title","label":"Title","values":["Comparative anatomy and biology of two species of the asteroid genus pisaster"]}]}],"canonical_facts":{"dc:contributor":["Joel W. Hedgpeth"],"dc:creator":["Mayer, Norman William"],"dc:date.available":["2018-06-29T08:41:51Z"],"dc:description.abstract":["Interest in the endemic Pisaster was first aroused by the great variation of external color in Pisaster ochraceus. This in turn led to observations of the diversity of the spinous patterns of this sea star. Following the suggestion of Dr. Jool D. hedgepeth it was decided to make an extensive comparison of the common species of Pisaster.
Detailed comparison between Pisaster brevispinus and Pisaster ochraceus have been made only by Fisher (1930) and Verrill (1914). Both of these investigators restricted their observations largely to the endoskeleton and its calcareous protuberances. In addition to analyzing the work of Fisher, an attempt to differentiate between the two species regarding behaviour, tolerances, gross anatomy and natural history has been made. In addition some mention of the relationships with other members of the family Asteriidae is recorded in this study.
"],"dc:identifier":["https://scholarlycommons.pacific.edu/uop_etds/1548"],"dc:rights":["http://rightsstatements.org/vocab/NKC/1.0/"],"dc:source":["128"],"dc:subject":["Starfishes","Biology","Life Sciences"],"dc:title":["Comparative anatomy and biology of two species of the asteroid genus pisaster"],"thesis:degree_discipline":["Biological Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Arts (M.A.)"]},"updated_at":"2026-07-24T05:37:26Z"}