Frederick R. Schram epub The Mazon Creek Caridoid Crustacea, Vol. 30 (Classic Reprint)

New morphologic data has come to light to cast doubt on the separation of the eocarid groups into a separate superorder. The pygocephalomorphs now appear to be a specialized form of mysidacean peracarid. The eocaridaceans are possibly referable to several different schizopod groups but are left as eocarids for the time being. Specimens from a number of public and private collections have been used in this study. Prefixes denote the collections in which these specimens may be found. PE Field Museum of Natural History USNM United States National Museum YPM Peabody Museum, Yale University DP rivate collection of Mr. Kenneth Davenport, formerly of Chicago, Illinois GP rivate collection of the Calvin George family, Naperville, Illinois HP rivate collection of Mr. Jerry Herdina, Berwyn, Illinois KP rivate collections of Mr. and Mrs. James Koneckny, Prescott, Arizona HTP Private Collection of Mr. and Mrs. Ted Pieko, Chicago, Illinois SYSTEMATICS Superorder PERACARIDA Caiman 1904 Order MYSIDACEA Boas 1883 Suborder PYGOCEPHALOMORPHA Beurlen 1930 Carapace with branchiostegal development; abdomen equal in length to the thorax or reduced; females with obstegites and seminal receptacle; well-developed caudal spines and furcae. Occurrence. Lower Mississippian -U pper Permian. Family PYGOCEPHALIDAE, Brooks 1962 Carapace with antero-lateral spines. Occurrence. Lower Pennsylvanian-L ower Permian. Mamayocaris, Brooks 1962 Short antero-lateral spines followed typically by five branchiostegal serrations; posteriorly directed cervical groove; telson subtriangular; females with seminal receptacles (oostegites not observed). Occurrence. Middle Pennsylvanian-L ower Permian. Mamayocaris jaskoskii. new species Diagnosis. Moderate in size; small caudal furcae; accessory projection of telson over the caudal spine; sigmoid diaresis on exopod of the uropod. Description. The carapace is s(Typographical errors above are due to OCR software and don't occur in the book.)