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Microevolutionary Dynamics of the Early Devonian Conodont Wurmiella from the Great Basin of Nevada

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Microevolutionary Dynamics of the Early Devonian Conodont Wurmiella from the Great Basin of Nevada Palaeontologia Electronica http://palaeo-electronica.org MICROEVOLUTIONARY DYNAMICS OF THE EARLY DEVONIAN CONODONT WURMIELLA FROM THE GREAT BASIN OF NEVADA Peter D. Roopnarine, Michael A. Murphy, and Nancy Buening ABSTRACT The morphologically smooth basal platform margin of one conodont element (P1) in the spathognathodontid ozarkodinidids is a key diagnostic feature for taxon identifi- cation. Differences in the shape of this margin have been used as the basis for genea- logical delineation and the interpretation of evolutionary dynamics, yet very little is known of the morphological or ontogenetic processes that generate shape variation within the group over geological time. Furthermore, the absence of reliably recogniz- able geometric landmarks along this margin prevents the application of standard geo- metric morphometric techniques. This paper addresses these problems by developing a new method for the quantitative description of margin shape, analyzing the ontogeny of shape change within specific stratigraphic intervals, and describing the pattern of evolution of margin shape over geological time. Specimens of the genus Wurmiella were obtained from the Windmill Limestone (Pragian) of central Nevada. The resulting morphometric data were used to discrimi- nate three species within the samples, Wurmiella wurmi, W. tuma, and a currently undescribed species, W. n. sp. The taxa are differentiated both on the basis of overall shape, as well as differences in margin allometry as described by spline shape and size (recorded separately as centroid size). An examination of evolutionary pattern in the W. wurmi samples, using a random walk-based technique, demonstrates that three independent aspects of margin shape evolved differently. The overall arch and relative position of the basal cavity were highly constrained and static, while the shape of the margin anterior to the basal cavity underwent an episode of significant directional evo- lution. Peter D. Roopnarine. Department of Invertebrate Zoology & Geology, California Academy of Sciences, Golden Gate Park, San Francisco CA 94118-4599 , USA. [email protected] Michael A. Murphy. Department of Geology, University of California Davis, Davis CA 95616, USA. [email protected] Nancy Buening. Department of Geology, University of California Davis, Davis CA 95616, USA. [email protected] KEY WORDS: conodont, Wurmiella, microevolution, morphometrics PE Article Number: 8.2.31A Copyright: Paleonological Society October 2004 Submission: 4 February 2003. Acceptance: 16 February 2004. Roopnarine, Peter, D. 2004. Microevolutionary Dynamics of the Early Devonian Conodont Wurmiella from the Great Basin of Nevada. Palaeontologia Electronica Vol. 8, Issue 2; 31A:16p, 860KB; http://palaeo-electronica.org/paleo/2005_2/dynamics/issue2_05.htm ROOPNARINE, MURPHY, AND BUENING: MICROEVOLUTION IN WURMIELLA INTRODUCTION macroevolutionary phenomena are 1) the extent to which character variability within ancestral popula- The long-term utilization of conodonts as one tions determines variation among descendant spe- of the primary elements of Paleozoic and Triassic cies, and 2) whether within-species evolution is at biostratigraphy has resulted in a database of strati- all relevant to the differences among species. The graphic information that far exceeds that available first question addresses variation at the organismal for any other Paleozoic or early Mesozoic meta- level, such as ontogenetic change and the pro- zoan taxon (Sweet 1988). The geographically and cesses of ontogenetic change, for example allome- sedimentologically widespread distributions of try, heterochrony and heterotopy. The second many conodont taxa, the group’s long stratigraphic returns to one of the central arguments of punctu- history, and the stratigraphic density of the con- ated equilibrium theory, and that is the restriction of odont fossil record make these organisms ideal tar- major morphological change to times of speciation gets for evolutionary paleobiological questions. (Gould 2001). Whether most of the geological span The present paper applies these properties of the of a species is characterized by constrained stasis conodont record to long-standing questions of (Roopnarine 2001) or oscillatory ‘no net change’ microevolutionary dynamics, an exercise not evolution, the implication is that speciation, as unique to this paper (for example, Murphy et al. identified by a significant morphological discontinu- 1981), but one that has not been disseminated ity, is essentially independent of intraspecific evolu- broadly into the mainstream paleobiological litera- tion. These issues should be addressed by high ture. In turn, current ideas and techniques of mor- resolution, quantitative studies of intraspecific mor- phometric analysis and the analysis of fossil time- phological change, coupled with methods appropri- series (Roopnarine et al. 1999; Roopnarine 2001) ate for the classification of microevolutionary are applied here to the study of the Lower Devo- modes. This paper addresses both these issues, nian genus Wurmiella from the Great Basin of examining within-sample variation, as well as Nevada. stratophenetic change in Wurmiella. Microevolutionary Studies The highly variable P1 element forms the basic means of taxonomic differentiation in ozarko- Patterns of microevolutionary change are of dinide conodonts (Sweet 1988) (Figure 1). The central importance to our understanding of organis- shape and outline of the lower profile of the ele- mal diversification over geological time. While the ment is a key feature supporting taxonomic and time-scale of microevolution challenges the finest phylogenetic hypotheses (Murphy et al. 1981) and temporal resolutions available from the fossil is the focus of analysis in this paper. The lower record, the major theory of diversification (that is, profile, however, is a curved or sinuous structure the origin of species by natural selection) claims with very few discrete landmarks and therefore that microevolution is fundamental to the produc- does not lend itself to a typical geometric morpho- tion of new diversity. On the other hand, more metric approach (Bookstein 1991). Here we recent macroevolutionary hypotheses such as spe- present a new method combining a landmark cies selection (Stanley 1975) and the possible ran- approach and a spline-based description of the P1 dom nature of mass extinction events (Gould 2002) element’s basal platform in lateral profile. The have called into question the degree to which technique relies on the presence of two geometri- microevolutionary processes might exert any con- cally homologous landmarks on the element’s plat- trol over long-term patterns of diversity. The fossil form to convert spline coordinates to Bookstein- record remains one of the primary sources of infor- style shape coordinates for subsequent analysis of mation capable of resolving the conflict between a within-sample dispersion and allometry, and strict Darwinian view versus hierarchical among-sample discrimination. Finally, the evolu- approaches to selection as a structuring agent in tionary mode of the stratigraphically ordinated diversification. Accessing this information, how- samples is classified using the Hurst-estimation ever, requires work at the finest stratigraphic reso- method outlined in Roopnarine (2001). lutions available, detailed quantitative morphological analyses, and objective assess- SYSTEMATIC PALEONTOLOGY ments of microevolutionary series. Evolutionary change and character variation Phylum CHORDATA Bateson, 1886 can be expected to be largely continuous and Class CONODONTA Pander, 1856 quantitative as temporal intervals approach gener- Order OZARKODINIDA Dzik, 1976 ational timescales. Two questions of great impor- Family SPATHOGNATHODONTIDAE Haas, 1959 tance to understanding the role of microevolution in 2 ROOPNARINE, MURPHY, AND BUENING: MICROEVOLUTION IN WURMIELLA even curvature of the M elements and the incre- mentally larger posterior denticles of the Sc ele- ment. Wurmiella wurmi (Bischoff and Sannemann 1958) Holotype by original designation = Spathognatho- dus wurmi Bischoff and Sannemann, 1958, pl. 14, fig. 5. Diagnosis. A species of Wurmiella with a combi- nation of the following characteristics in the P1 ele- ment: biconcave to convexo-concave lower profile in lateral view, moderate shoulder with or without a denticle on the shoulder on the inner side of the blade or without a shoulder; ledge at the base of the denticle row; 17-27 denticles depending on the size and stratigraphic level of the specimen. Description. P1 element gently twisted, slightly more strongly near the extremities; basal cavity small, asymmetrical, with inner side more expanded; basal grooves appressed at their distal ends and with straight anterior segment in smaller specimens; lower profile in lateral view biconvex to convexo-concave; upper margin in lateral view biconvex; cross section of blade (below the denti- cles) low walled, thick at maturity; ledge normally developed on inner side at base of denticles; flanks of blade inflated below ledge and with a narrow pinch zone close to the lower margin; height of both parts (anterior and posterior) of blade about Figure 1. Wurmiella P1 elements. A) Wurmiella tuma; equal; thicker (wider) and higher denticles concen- B) W. wurmi; C) W. n. sp. All specimens approximately trated near the centers of anterior and posterior x90. parts of blade; at the position of basal cavity ledge bulges laterally to form shoulder on inner
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