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Title: A New Subspecies of Slider Turtle (Pseudemys scripta) from Coahuila, Mexico

Author: John M. Legler

Release Date: March 9, 2010 [EBook #31574]

Language: English

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University of Kansas Publications
Museum of Natural History

Volume 13, No. 3, pp. 73-84, pls. 9-12, 3 figs.
August 16, 1960

A New Subspecies of Slider Turtle
(Pseudemys scripta) from Coahuila, México

BY
JOHN M. LEGLER

University of Kansas
Lawrence
1960

University of Kansas Publications, Museum of Natural History

Editors: E. Raymond Hall, Chairman, Henry S. Fitch,
Robert W. Wilson

Volume 13, No. 3, pp. 73-84, pls. 9-12, 3 figs.
Published August 16, 1960

University of Kansas
Lawrence, Kansas

PRINTED IN
THE STATE PRINTING PLANT
TOPEKA, KANSAS
1960

28-3860

[Pg 75]

A New Subspecies of Slider Turtle
(Pseudemys scripta) from Coahuila, México

BY

JOHN M. LEGLER

In September, 1958, the author and two colleagues collected a large series of Pseudemys in small ponds and in a river in the basin of Cuatro Ciénegas, Coahuila. The specimens prove to represent a previously unrecognized subspecies of Pseudemys scripta. The subspecies is named in honor of Edward Harrison Taylor who has contributed more than any other person to our present knowledge of the herpetofauna of México.

Pseudemys scripta taylori new subspecies
(Pls. 9-12, Figures 1 & 2)

Table 1. Measurements (in millimeters) of the Holotype (46952) and Nine Adult, Topotypic Paratypes of Pseudemys scripta taylori New Subspecies. Height Was Measured in a Vertical Line from the Center of the Plastron.

Description of holotype (measurements given in Table 1).—Carapace oval in dorsal aspect, slightly narrowed behind, nearly straight across anterior margin, bluntly serrate behind; shell deep, highly arched in cross section; height of shell 53 per cent of width; surface of shell having longitudinal striations; middorsal keel weakly developed, scarcely discernible except on third central lamina; lateral margin of carapace not at all reflected, posterolateral margins flared outward; central laminae all broader than long, the first urn-shaped.

Ground color of carapace (hereinafter, colors are those of preserved specimen) dark olive; upper surface of each marginal scute having round or oval [Pg 76] black mark, two such marks on each marginal of first pair; marks on margin of anterior half of carapace having pale orange-yellow borders, marks more posteriorly having indistinct borders or no border; upper surface of carapace having numerous, irregularly arranged black marks on a faint reticulum of pale lines; one or two large oval marks on each lateral scute arranged more or less vertically, other marks on laterals irregular in size and arrangement; central scutes having three to five longitudinally arranged, narrow black marks on each scute.

Ground color of plastron pale yellow, anterior half extensively marked with black along laminal seams; all plastral markings interconnected; undersurfaces of marginals on anterior half of shell having pale centers; undersurfaces of posterior marginals and posterior half of plastron solid black.

Plastron more or less evenly rounded in front, slightly indented on gular border; posterolateral free edge of plastron reflected slightly downward; posterior border of plastron having wide shallow anal notch; plastral laminae, in order of length—abdominal, anal, pectoral, gular, femoral, humeral; abdominal lamina longer than combined lengths of pectoral and humeral or humeral and gular.

[Pg 77] Head moderately wide; snout slightly pointed in dorsal view, curving evenly backward and downward from nostrils in profile; upper jaw notched in middle, cutting edges finely and unevenly serrate, crushing surfaces having distinct ridge bearing fine denticulations but no large teeth; cutting edges of lower jaw coarsely and evenly serrate, tooth at symphysis relatively large; raised ridges of lower crushing surfaces each having low blunt tooth and many fine denticulations.

Major markings of head and neck as follows: narrow stripe beginning at posterior edge of eye and extending downward and backward (across tympanum) on side of neck to shoulder (stripe wider behind than at origin); wide stripe from lower posterior corner of eye extending downward, across mandibular articulation (and below tympanum) on throat to shoulder (wider at origin than behind); postorbital mark, four to five millimeters wide, approximately 26 millimeters long, connected to eye by narrow isthmus anteriorly and continuous with narrow stripe on upper part of neck posteriorly; stripe on mandibular symphysis widened and bifurcated posteriorly, its two branches enclosing one wide and two narrow stripes; wide stripe beginning in middle of mandibular ramus and running backward to point below mandibular articulation on each side; top of head, sides of snout, and areas between above-mentioned major stripes, marked with numerous, fine, often indistinct pale lines.

Pale dorsal stripe on fleshy portion of each finger, those of second and fourth fingers continuous to mid-humeral region, those of other fingers broken on anterior face of antebrachium; upper and lower pale stripes of antebrachium joined in mid-humeral region.

Coloration of living specimens.—Ground color of soft parts dark olive to slate gray or black; ground color of carapace olive to slate gray; ground color of plastron pale yellow, markings blackish, tinged with brown in younger specimens, sooty black in most adults. Postorbital mark red; other markings on soft parts cream to buffy yellow.

Geographic range.—Pseudemys scripta taylori is known only from ponds, and the Río Chiquito in the basin of Cuatro Ciénegas. The discovery of taylori brings to six the number of valid subspecies of scripta known in México (elegans, gaigeae, hiltoni, nebulosa, ornata, and taylori) and to three (elegans, gaigeae, and taylori) the number known in Coahuila. My own studies of these six subspecies indicate that they are, beyond reasonable doubt, members of a single polytypic species (scripta). I tentatively follow Williams (1956:153) in rejecting "cataspila" as an invalid name.

Three specimens of Pseudemys scripta obtained by Robert G. Webb in the Río Chiquito at a point 8 mi. W of Nadadores, 2100 ft., where the river flows out of the basin of Cuatro Ciénegas, have many characteristics in common with taylori, but resemble elegans closely in several characters as follows: no extensive melanism; plastral markings tending to be brownish; anterior plastral markings smudgelike, isolated or nearly isolated; markings on lateral scutes tending to have vertical, linear arrangement; cutting edge of mandible weakly serrate; femoral edges of plastron not reflected ventrally; one or more fine, pale lines between two major stripes on antebrachium; gular longer than pectoral in one specimen, longer than femoral in both specimens. The nature of these specimens suggests that parts of the Río Salado drainage north and east of Cuatro Ciénegas are in a zone of intergradation between taylori and elegans. I have examined what I consider to be typical examples of P. s. [Pg 78] elegans from the region of Múzquiz (CNHM 28843-45, 55625-45), and from Don Martín Reservoir (KU 33524). These localities are, respectively, approximately 70 miles north-northeast and 100 miles east-northeast of Cuatro Ciénegas. The specimens from Múzquiz are presumably the same that Carr (1952:262) treated as "... elegans-cataspila intergrades, but with a strong leaning toward eastern elegans...." Populations of P. scripta in central eastern Coahuila (between the above-mentioned localities and Cuatro Ciénegas) probably are a conglomerate of only two subspecies (elegans and taylori), not including gaigeae (as was suggested by Hamilton, 1947:65 and by Carr, op. cit.:241, map 17;262).

Specimens reported by Schmidt and Owens (1944:101) as P. s. gaigeae (from several localities in the region mentioned above) have been examined in the course of my study and prove to be P. floridana texana. A specimen reported by Shannon and Smith (1949:399; IU 4094, Hidalgo Co., Texas) as being either gaigeae or an elegans-gaigeae intergrade, has been examined and is here regarded as a typical specimen of elegans. I regard P. s. gaigeae as a subspecies of the upper Río Grande and disrupted parts of that drainage; the range of that subspecies meets that of P. s. elegans somewhere between the Big Bend region and Piedras Negras. In any event, the influence of gaigeae is not so widespread as other authors (Carr, loc. cit.; Hamilton, loc. cit.; Hartweg, 1939:3-4) have indicated.

Further collecting in the Río Salado and its tributaries east and north of Cuatro Ciénegas will be necessary before the exact range of P. s. taylori can be determined.

Variation.—Characteristics ascribed to the holotype pertain in general to all specimens in the hypodigm, except as noted below. The postorbital mark is in contact with the eye on one or both sides in 46 per cent of the specimens (narrowly separated from eye in remainder) and is in contact with a neck stripe (on one or both sides) in 35 per cent of the specimens. The pattern of the antebrachium is as shown in Fig. 2 in all specimens except that the thin lateral stripe is obliterated by melanism in older specimens of both sexes. The lateral edges of the posterior plastral lobe are reflected downward, at least slightly, in all but one specimen (an adult, kyphotic female). The first central lamina is straight-sided in juveniles and becomes urn-shaped only in adults. The relative height of the shell tends to increase with a general increase in size in both sexes.

Fig. 1. Pseudemys scripta taylori new subspecies: left side of head, female paratype (KU 46933), × 1.

Fig. 2. Pseudemys scripta taylori new subspecies: anterior view of left antebrachium, female paratype (KU 46934), × 1.

[Pg 79]

Comparisons.—Of the five other subspecies of Mexican P. scripta mentioned above, three subspecies (gaigeae, hiltoni, and nebulosa) form a natural group herein referred to as the gaigeae group. Pseudemys s. taylori is distinguished from members of the gaigeae group by elongate, red postorbital mark (yellow or orange in the gaigeae group), extensive black plastral pattern (narrow—or if wide, brownish—in gaigeae group), and serrate lower jaw (nearly smooth in gaigeae group).

The subspecies P. scripta taylori differs from P. scripta elegans as indicated in the following comparative list of characteristics:

P. s. taylori	P. s. elegans
1. Extensive black plastral pattern, all parts of which are interconnected. Plastral pattern partly obliterated by melanism in old individuals of both sexes.	1. Plastral pattern consisting of separate brown smudges (at least anteriorly). Plastral pattern obliterated by melanism only in adult males.
2. Markings of carapace in form of indistinct ocelli.	2. Markings of carapace having linear and vertical.
3. Cutting edge of mandible serrate.	3. Cutting edge of mandible smooth.
4. Foreclaws of mature males unmodified.	4. Foreclaws of mature males greatly elongated.
5. Gular shorter than pectoral (91 per cent of specimens), gular and femoral subequal.	5. Gular longer than pectoral (90 per cent of specimens) and longer than femoral (all specimens).
6. Shell relatively higher, posterior lobe of plastron relatively narrower (Fig. 3).	6. Shell relatively lower, posterior lobe of plastron relatively wider (Fig. 3).
7. Lateral edges of posterior plastral lobe reflected downward.	7. Lateral edges of posterior plastral lobe unmodified.

Four specimens of P. s. ornata (MCZ 46392-3, 46397, 46400, two adult females and two adult males) from the Río Soto la Marina drainage of Tamaulipas differ from P. s. taylori as follows: plastral pattern diffuse and brownish, not black; gular longer than pectoral; cutting edge of lower jaw only slightly serrate; stripe on mandibular symphysis isolated, not joined with ventral neck stripes to form inverted Y; postorbital stripe (yellow in preservative) connected to eye by narrow isthmus and continuous with neck stripe to shoulder.

In P. s. taylori there is an obtuse ridge or prominence across the bridge, on a line joining the free lateral edges of the plastron; the area between the ridges is nearly flat. The bridge forms a distinct plane on each side between the mentioned ridge and the outer edges of the marginals. In cross section this plane forms an angle of 30 to 45 degrees with the horizontal plane of the plastron. The higher bridge and deeper shell of taylori result in a slightly higher center of gravity in this subspecies than in the specimens of elegans and ornata I have examined. In the two subspecies last named the longitudinal ridges on the plastron are indistinct or wanting and the bridge forms a lesser angle with the horizontal plane of the plastron.

The largest female of taylori (218 mm.) is shorter by some 30 mm. than the smaller female in the series of ornata from Tamaulipas whereas the largest male of taylori (179 mm.) is shorter by some 80 mm. than the smaller male from Tamaulipas. Pseudemys s. taylori probably is smaller, on the average, than either elegans or northern populations of ornata.

There seems to be no reliable published record of the color of the postorbital [Pg 80] mark in living examples of P. s. ornata from Tamaulipas. Williams (1956:147, 154) indicated that this color may be red or yellow for Mexican and Central American populations of ornata in general and Günther (1885: Pl. 6 b) indicated that the color was yellow in Emys cataspila; however, both of the observations mentioned were presumably based on preserved rather than living specimens. The postorbital marks of a live specimen of ornata (KU 40131) from southern Veracruz were yellowish to buffy with a pinkish tinge anteriorly (fide notes of Robert G. Webb and a color photograph by him).

Fig. 3. Relative height of shell (expressed as a percentage of width) and relative width of posterior plastral lobe (expressed as a percentage of plastral length) in two subspecies of Pseudemys scripta. The data presented are for 62 specimens (40 ♀, 22 ♂) of P. s. taylori and 37 specimens (13 ♀, 24 ♂) of P. s. elegans. Horizontal and vertical lines represent the mean and range, respectively, whereas open and solid rectangles represent one standard deviation and two standard errors of the mean, respectively.

PLATE 9

Pseudemys scripta taylori new subspecies: dorsal view of holotype (KU 46952), approximately 11/16 natural size.

PLATE 10

Pseudemys scripta taylori new subspecies: ventral view of holotype (KU 46952), approximately 11/16 natural size.

PLATE 11

Paratypes of Pseudemys scripta taylori new subspecies: Left—dorsal and ventral views of KU 46943, male, 16 km. S Cuatro Ciénegas, × ⅜; Upper right—KU 46974, juvenile, 6 mi. W Cuatro Ciénegas, × ⅚; Lower right—KU 46968, male, 16 km. S Cuatro Ciénegas, × ⅜.

PLATE 12

Ventral views of four subspecies of Pseudemys scripta: Upper left—P. s. ornata (KU 40131 ♀), Río Playa Vicente, San Andrés Tuxtla, Veracruz, × ⅓; Upper right—P. s. gaigeae (IU 43583 ♀), 1 mi. E La Cruz, Chihuahua, × ⅜; Lower left—P. s. elegans (CNHM 55627 ♂), Múzquiz, Coahuila, × ⅔; Lower right—P. s. taylori new subspecies (KU 46970 juvenile), paratype, 6 mi. W Cuatro Ciénegas, Coahuila, × 11/16.

Natural history.—Specimens of P. s. taylori were caught in hoop nets in clear deep pools and in the Río Chiquito. No specimens were collected or observed in marshy situations where the water [Pg 81] was shallow or stagnant. Individuals were seen only near dusk and in early morning when a number floated just below the surface with only their heads showing. They were never seen on land during our short stay in the basin. The few stomachs that were opened contained vegetable material. In terms of number of specimens trapped, P. s. taylori was the most abundant turtle in pools at and near the type locality (Webb and Legler, 1960).

Relationships and phylogeny.—The basin of Cuatro Ciénegas now drains, via the Río Salado, into the lower Río Grande. Brief descriptions of habitats and topography in the basin are given by Gilmore (1947:148-150, fig. 2) and Webb and Legler (1960). In the more northern parts of the Salado drainage (for example, in the Río Sabinas near Múzquiz) slider turtles are typical P. s. elegans. Assuming that conditions which permit genetic exchange between populations of turtles in the Salado drainage system differ in no major respect from conditions in other parts of the range of Pseudemys scripta, it is logical to suppose that the differentiation of P. s. taylori at Cuatro Ciénegas was preceded by the isolation of a population in that basin.

The Río Chiquito drains through a narrow gap in the northeastern end of the basin of Cuatro Ciénegas. Interruption of this stream would effectively isolate aquatic habitats in the basin.

It is here proposed that P. s. taylori is a relict of an earlier, lower Río Grande stock, part of which became isolated in the basin of Cuatro Ciénegas in postpluvial times. The morphological similarity of P. s. taylori and P. s. elegans indicates that both were derived from this parent stock; similarity of both subspecies to populations of P. s. ornata in Tamaulipas suggests that the latter subspecies may also be a derivative of the mentioned stock of the lower Río Grande.

The proposed former isolation of the basin of Cuatro Ciénegas is supported by evidence found in studies of other turtles in the basin. Of the four kinds of turtles known to occur there (Terrapene coahuila, P. s. taylori, Trionyx spinifer emoryi, and Trionyx ater), all but T. spinifer seem to be endemic. These three kinds comprise a graded series, in regard to their degree of differentiation from closest known relatives, as follows: 1) Terrapene coahuila is morphologically the most generalized and primitive of living box turtles; the species is unique in its highly aquatic mode of life (see Legler, 1960:532-534, for brief discussion of relationships within genus Terrapene); 2) Trionyx ater seems to represent a relict population of pre-Trionyx spinifer stock; presumably, spinifer has reinvaded the [Pg 82] basin of Cuatro Ciénegas in relatively recent times and, as noted above, spinifer and ater now occur sympatrically (at least in a geographic sense) in the basin (Webb and Legler, op. cit.); and, 3) evidence presented above suggests that P. s. taylori intergrades with P. s. elegans outside the basin.

The three endemic populations of turtles at Cuatro Ciénegas therefore, differ by varying degrees from their closest living relatives. This variation in degree of difference possibly results from varying periods of isolation. Probably the basin of Cuatro Ciénegas has been isolated from, and reconnected to, the lower Río Grande drainage at several times in the past. The relationships of fishes in the basin, now under study by other workers, also suggest that the basin was isolated more than once.

[Pg 83]

LITERATURE CITED

Carr, A.

Gilmore, R. M.

Günther, A.

Hamilton, R. D.

Hartweg, N.

Legler, J. M.

Schmidt, K. P., and Owens, D. W.

Shannon, F. A., and Smith, H. M.

Webb, R. G., and Legler, J. M.

Williams, E.

    Department of Zoology and Entomology, University of Utah, Salt Lake City, Utah, Transmitted May 23 1960.

[Pg 84]

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