. The Branchiobdellidae (Oligochaeta) of North American crayfishes. Crayfish; Branchiobdellidae. BRANCHIOBDELLIDAE OF CRAYFISHES—GOODNIGHT genus of Naididae the members of which are carnivorous and sometimes ectoparasitic. Michaelsen further compares the jaws to the pair of buccal stylets with chitinous tips in the buccal cavity of certain Enchytraeidae. Since their genital organs are so much like those of the Lumbriculidae, it is generally agreed that they have a common origin with that family. Both these families have the combined male ducts opening to the outside on the segment that contain
. The Branchiobdellidae (Oligochaeta) of North American crayfishes. Crayfish; Branchiobdellidae. BRANCHIOBDELLIDAE OF CRAYFISHES—GOODNIGHT genus of Naididae the members of which are carnivorous and sometimes ectoparasitic. Michaelsen further compares the jaws to the pair of buccal stylets with chitinous tips in the buccal cavity of certain Enchytraeidae. Since their genital organs are so much like those of the Lumbriculidae, it is generally agreed that they have a common origin with that family. Both these families have the combined male ducts opening to the outside on the segment that contains the hinder pair of testes. In many re- spects the Branchiobdellidae are only modified Lumbriculidae. Their re- lationships are shown in the accompanying diagram from Stephenson (1930:705). Lumbricidae Glossoscolecidae Aeolosomatidae Naididae ? Enchytraeidae . Tubificidae -Phrcodrilidae. Megascolecidae-Eudrilidae Moniligastridae Common ancestor of Megadrili Hirudinea Branchiobdellidae Haplotaxidae Lumbriculidae Diagram of Relationships (After Stephenson, 1930) Michaelsen (1919b-: 152) points out the similarity between leeches and oligochaetes and that the most significant difference is the position of the testes, posterior to the ovaries in Hirudinea and anterior in the Oligochaeta. So he proposes the following natural classification of annelids: KREIS ANNELIDES I. Klasse Archiannelides II. Klasse Chaetopoda 1. Ordnung Protochaeta 2. Ordnung Polychaeta III. Klasse Clitellata " 1. Ordnung Oligochaeta 2. Ordnung Hirudinea IV. Klasse Echiuroidea V. Klasse Sipunculoidea The two families, Branchiobdellidae and Acanthobdellidae, link the Oligochaeta and Hirudinea inseparably. Frank Smith (1920) reported this work in English, and at the time seemed to agree with the proposed Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfec
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectcrayfish
