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The Identity of Protopodal Segments and the Ramus of Maxilla 2 of Copepods (Copepoda)

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image of Crustaceana

The protopod of the maxilla 2 of copepods is composed of a proximal syncoxa with a praecoxal endite proximally and a coxal endite distally. The basis bears two endites, and the ramus is an endopod bearing up to five segments. This interpretation is based on protopodal patterning from the point where the limb articulates with the body, and the assumption that this patterning should result in a derivable enditic configuration on the protopod of the serially homologous limbs maxilla 1 anteriorly and maxilliped posteriorly. Processes that affect the morphological diversity of maxilla 2 among copepods include: truncation of protopodal segmentation, suppression of enditic extension, truncation of endopodal segmentation, and segment elongation. Hypotheses about transformations of the basis suggest the following synapomorphies: neither endite of the basis is attenuate on maxilla 2 of Poecilostomatoida; the basis of maxilla 2 of Siphonostomatoida is elongate ventrally. Le protopodite de la seconde maxille des copépodes est composé d'un syncoxopodite proximal, avec un endite précoxal proximal et un endite coxal distal. Le basipodite porte deux endites, et la rame est un endopodite portant jusqu'à cinq segments. Cette interprétation est fondée sur le patron protopodal à partir du point où l'appendice s'articule avec le corps, et la supposition que ce modèle aboutirait à une configuration enditique dérivable sur le protopodite des appendices homologues: première maxille antérieurement et maxillipède postérieurement. Les processus qui affectent la diversité morphologique de la deuxième maxille chez les copépodes incluent: la réduction de la segmentation protopodale, la suppression de l'extension enditique, la réduction de la segmentation endopodale et l'allongement des segments. Les hypothèses concernant les transformations du basis suggèrent les synapomorphies suivantes: aucun endite du basis n'est atténué sur la deuxième maxille des Poecilostomatoida; le basis de la deuxième maxille des Siphonostomatoida est allongé ventralement.

Affiliations: 1: Invertebrate Zoology / Museum Support Center, mrc-534, National Museum of Natural History, Smithsonian Institution, 4210 Silver Hill Rd., Suitland, MD 20746, U.S.A.;, Email: ferrarif@si.edu; 2: Department of Invertebrate Zoology, Biology Faculty, Moscow State University, Moscow 119 899, Russia

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/content/journals/10.1163/156854008784771702
2008-07-01
2016-12-03

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