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<br />data for the affected sections of the guide and incorporated in the revised "Comparative <br />Summary" and new "Computer-Interactive Key." <br />Based on prior experience and comparison with several alternatives, the DELTA program <br />for computer-interactive keys, lntkey (Dallwitz et al.1993 onwards, 1995 onwards), which <br />operates under Microsoft Windows 95 or later, was selected as the host program for the new key. <br />DELTA Editor (Dallwitz et al. 1999 onwards) was used to develop and refine a progressive <br />series of data sets for VCRB suckers and the derived data files required by lntkey. Like the <br />printed keys, a set of preliminary keys prepared prior to this project and early interim versions <br />developed during this project consisted of six keys, one for each developmental period or phase. <br />These early interim-version keys were demonstrated and discussed with opportunities for hands- <br />on experimentation at three technical meetings. Based on participant feedback, the separate data <br />sets and keys were combined into one for later versions. Late-interim and near-final versions of <br />the key were subjected to in-house testing. <br />The final key, available by FTP over the Internet (ftp://ftp.cnr.colostate.edu/pub/lfl/cik- <br />data; download "cat-ucrb.zip"), consists of a data set for 110 characters and 234 taxon items <br />(species subdivided by developmental interval and size variants) with associated image, text, and <br />controlling files for use by lntkey (http://biodiversity.uno.edu/delta/, download intk32.exe). <br />Instructions for installation and general use are provided in this report; detailed user and help <br />files are built into the program. Although lntkey can make extensive use of taxon and character- <br />state-selection images, preparation and inclusion of such was neither critical for operation of the <br />key nor logistically and budgetarily feasible for this project. Instead, the key is intended to be <br />used along with descriptions in the 1990 guide and this supplemental update, and, except for <br />three character-state images included mostly as examples, it refers extensively to figures in these <br />documents. <br />Whether the goal of facilitating more accurate identification of collected razorback and <br />other sucker larvae in the basin is realized beyond LFL staff depends on the extent to which <br />other regional biologists become familiar with and utilize the updated descriptive information, <br />new species account, and key. In addition to limited distribution of the new and revised <br />information and the new key through this final report, more formal publication and broader <br />distribution of the contents of this report as part of a new edition of the guide is expected to <br />extend its usefulness within and well beyond the UCRB. Allowing for potential differences in <br />developmental morphology exhibited by remote populations, either the 1990 guide and the new <br />key and information provided herein, or the planned new edition of the guide, can be used for <br />identification wherever two or more of the covered species may occur. <br />Future updates, expansions, or adaptations of the computer-interactive key could be made <br />more convenient, especially for new and less experienced users, by incorporating extensive <br />illustration of character states and taxa rather than referring users to illustrations in published <br />descriptions. But even without extensive illustration, this key has great potential for future <br />expansion or adaptation to cover catostomid fishes in other regions and cyprinid fishes in the <br />VCRB and elsewhere. <br />Except for formal publication, Part 1 of a comprehensive guide to cypriniform fishes in <br />the VCRB is now complete. It is recommended that the Recovery Program and CDOW proceed <br />with support for Part 2-a comparable guide and key to the cyprinid fishes, including three of the <br />four endangered species in the basin. <br /> <br />9 <br />