Systematics and acoustics of North American Anaxipha (Gryllidae: Trigonidiinae) ( Publisher's URL )

Material Information

Systematics and acoustics of North American Anaxipha (Gryllidae: Trigonidiinae)
Series Title:
Journal of Orthoptera Research 2014, 23(1): 38pp
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Journal Article
Thomas J. Walker and David H. Funk
Orthopterists' Society
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The genus Anaxipha has at least 13 North American species, eight of which are described here. Ten species fall into these three species groups: exigua group (exigua Say plus scia Hebard and n. spp. thomasi, tinnulacita, tinnulenta, and tinnula); delicatula group (delicatula Scudder and vernalis n. sp.); litarena group (litarena Fulton and rosamacula n.sp.). The remaining three (imitator Saussure, fultoni n.sp., and calusa n.sp.) have no close relatives among the other species. Most new species were initially distinguished by their calling songs, and in most cases sympatric populations proved cleanly separable by features of male genitalia and tooth-counts of stridulatory files. Species groups were based mostly on comparisons of male genital structures and the results of DNA barcoding. Species are here characterized not only by their songs and morphology, but also by geographical, ecological, and seasonal distributions. At a given temperature the pulse rate (PR) of the male’s calling song is a key aid to identification. PR at 25°C has a narrow range of variation within a species and among the 13 species its mean value varies from 5 to 79 p/s. As in other crickets, pulse rates plotted as a function of temperature have a positive, linear trendline. When trendlines for 11 Anaxipha species are extrapolated downward, the temperature at ŷ=0 p/s is 2.7±2.2 (mean±SD)--i.e., the lines tend to converge at about 3°C. This makes possible a simple formula for estimating the PR at 25°C from any Anaxipha calling song recorded at any temperature. Other aids to identifying species from their calling songs are the duration and regularity of breaks between pulse sequences and the relationship between PR and carrier frequency (CF). When CF is plotted as a function of PR, the relationship deviates noticeably from linear only in vernalis. We propose that in Anaxipha spp., as well as in six other genera in four gryllid subfamilies, the synchrony of tooth impacts and the fundamental vibrations of the CF is maintained by the scraper moving continuously over evenly spaced file teeth--rather than by the much-studied (and well-established) catch-and-release mechanism of Gryllus spp. Our proposal is based on the high rates of change in CF with temperature and on differences in the teeth of the stridulatory files. The PR at 25°C of each of the 13 species is remarkable in the degree to which it predicts the mean values of these five characters: file tooth number, tooth density, file length, pulse duration, and pulse duty cycle (Fig. 17). A neotype is designated for Gryllus pulicaria Burmeister (1838), the type species of the genus Anaxipha. With the e-version of this paper, extensive Supplementary Materials provide permanent access to data sets that are basic to our conclusions. These materials include detailed records of the specimens examined and of the more than 1300 recorded songs that were analyzed. Digitized versions of more than 450 of the recordings are archived in Cornell’s Macaulay Library of Natural Sounds.
Collected for University of Florida's Institutional Repository by the UFIR Self-Submittal tool. Submitted by Thomas Walker.
Publication Status:
In Press
General Note:
The 28 items of supplementary materials will be available on IR@UF. They consist of 13 PDF files, 13 xlsx files, and 2 mov files. Here are the details: Workbooks SMTBls_Specimens Specimen records for North American Anaxipha (13 sheets) SMTbls_Songs Song recording records of N. American Anaxipha (13 sheets) SMTbls_MapData Data for distribution points on maps of Fig. 1. (13 sheets) SMTbls_PRtrendlines All trendlines considered for Fig. 4 (3 sheets) SMTbls_COIdata Lab and Specimen data for DNA barcoding re Fig. 14 (2 sheets) SMTbls_PDbyRegress Regression-based pulse durations used in Fig.17 (14 sheets) SMTbls_HF&BLdata HF&BL measurements used in Fig. 19 (4 sheets) SMTbls_PTPilotStudy Data tables for TW's study of pulse train phrasing (5 sheets) Spreadsheets SMTbl_StridFiles File characters of North American Anaxipha SMTbl_PRcalculator App that calculates PRvs°C line from a single PR-°C pair SMTbl_MatingTests DF's 2010 mating tests among inland spp. of exigua group SMTbl_CFTempCoefs CF temperature coefficients (literature & this manuscript) SMTbl_PDdataByDM PD data obtained by Direct-Method and used in Fig. 17 PDF files SMFig_Portraits DF's portrait photos of North American Anaxipha SMFig_Genitalia 71 images of male genitalia of N. Amer. Anaxipha SM_AcalusaRelatives DF's summary of calusa relatives SMFig_PRvsTempAll PRvs°C recordings of all records in SMTbls_Songs SM_PTpilotStudy TW's attempt to quantify pulse train phrasing SMFig_PD&PIbySixSpp DF's log/log plots of PP, PD, PI of six Mid-Atlantic trillers SMFig_MaxLikliTree Tree based on COI sequences of N. Amer. Anaxipha SMFig_VideoAnalysis Measurements and graphs of wing movements in video SM_WMCsparsalsus WMC of Allonembius sparsalsus via ultra highspeed movie SM_PDbyRegression Estimating PD @ 25°C by linear regression (Fig. 17) SM_Oecanthus files Plots of 13 spp of N. A. Oecanthus as in Fig. 17A,B,C,E SM_Falcicula DF's findings of relation of F. hebardi to N. Am. Anaxipha SM_PhyllopalpusMating DF's account of mating behavior in P. pulchellus Videos SMvideo1_calusa video of calusa male courting (mov) SMvideo2_calusaSlwd slowed video of calusa male courting (mov)

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