Caudicriodus ruthmawsonae Drygant, 2010

Drygant, Daniel & Szaniawski, Hubert, 2012, Lochkovian conodonts from Podolia, Ukraine, and their stratigraphic significance, Acta Palaeontologica Polonica 57 (4), pp. 833-861 : 846-848

Caudicriodus ruthmawsonae Drygant, 2010

Fig. 10F, H.

1968 Icriodus woschmidti Ziegler 1960 ; Drygant 1968b: 46 [partim], fig. 1 [non fig. 2–4 = Caudicriodus postwoschmidti (Mashkova, 1968) ].

1976 Caudicriodus postwoschmidti (Mashkova, 1968) ; Bultynck 1976: 26, pl. 6: 1–2.

?1980 Icriodus woschmidti hesperius Klapper and Murphy ; Schönlaub 1980b: pl. 6: 5.

1984 Icriodus woschmidti transiens Carls and Gandl ; Drygant 1984: 134 [partim], pl. 16: 7, 9–11 [non 5, 6, 8, 12–16].

1990 Icriodus woschmidti postwoschmidti Mashkova ; Olivieri and Serpagli 1990: 63, pl. 1: 15 [only].

1995 Icriodus postwoschmidti Mashkova ; Colquhoun 1995: pl. 1: 4 [only].

2003 Icriodus woschmidti woschmidti Ziegler, 1960 ; Farrell 2003: 125, pl. 2: 4.

2005 Icriodus eolatericrescens Mashkova ; Barrick et al. 2005: pl. 3: 11.

2010 Caudicriodus ruthmawsonae nov. sp.; Drygant 2010: 59, pl. 3: 1, 2, 6.

Material.—Twelve Pa elements from the Mytkiv Formation and lower part of the Chortkiv Formation. Sections and samples: 16/4, 12/1a, 2, 17/4b, 18/5, 5d, 45/170 and 180 m, 13/ 260 m.

Remarks.—Pa elements of the species possess straight margins of the platform and lateral processes. Spindle long (0.89–0.96 mm) and narrow, with maximal 6 transverse ridges in which the denticles of the middle−row are smaller than those of the lateral rows. Lateral denticles of the transverse ridges are connected with the denticles of middle row by thin transverse ridges. Postero−lateral process triangular, elongated, denticulated or smooth. Spur well developed, fused with the postero−lateral lobe form together a process of the rhomboidal wing shape. Inner margin of the spur and outer margin of the postero−lateral process parallel. Primary cusp higher than the secondary and the denticles of the transverse ridges.

The species differs from the related Caudicriodus woschmidti ( Ziegler, 1960) and C. hesperius ( Klapper and Murphy, 1975) by the outline of platform which has straight margins, triangular form of the processes and wider inner side. From the C. transiens ( Carls and Gandl, 1969) it differs by narrower platform and straight margins of lobes. The specimen illustrated by Olivieri and Serpagli (1990: 63, pl. 1: 15) as Icriodus woschmidti postwoschmidti Mashkova, 1968 differs from that species by the outline of platform and wider space between the transverse ridges but does not differ much from C. ruthmawsonae .

Stratigraphic and geographic range.—Upper part of Caudi−

DRYGANT AND SZANIAWSKI— EARLY DEVONIAN CONODONTS FROM PODOLIA 847

200 μm A B C F1 F2 G L M N K P Q R S1 S 2 T 1 D E1 E2 H I J1 O1 O2 J2 V T 2 U1 U2 W

ZPAL C.20/4.20. K. Caudicriodus alcoleae (Carls, 1969) ; Syn'kiv−45/ 170–180 m, ZPAL C.20/11.9. M. Juvenile form of? Caudicriodus transiens ( Carls and Gandl, 1969) ; Dobrivlyany−11/ 380 m, ZPAL C.20/2.4. N, Q–U. Juvenile forms of different species of Caudicriodus ( Caudicriodus transiens – Caudicriodus serus zones). N. Syn'kiv−45/ 180 m, ZPAL C.20/4.13. Q. Syn'kiv−45/ 185 m, ZPAL C.20/4.2. R. Syn'kiv−45/ 185 m, ZPAL C.20/ 4.7. S. Dnistrove−105/ 25 m, ZPAL C.20/3.5. T. Dobrivlyany−11/ 375 m, ZPAL C.20/2.9. U. Syn'kiv−45/ 180 m, ZPAL C.20/2.5. O. Caudicriodus postwoschmidti (Mashkova, 1968) ; Vynohradiv−5/ 335 m, ZPAL C.20/5.2. P. Juvenile form of Caudicriodus postwoschmidti (Mashkova, 1968) , Zozulyntsi−13/ 280 m, ZPAL C.20/4.19. V. Pelekysgnathus csakyi ( Chatterton and Perry, 1977) ; Ivanye Zolote−52/ 498 m, ZPAL C.20/11.24. W. Pedavis cf. breviramus Murphy and Matti, 1982 ; Ivanye Zolote−52/ 500 m, ZPAL C.20/9.13. A–D, E 1, F 1, G–I, J 1, K–N, O 1, P–R, S 1 –U 1, W upper wiew; E 2, F 2, J 2, S 2 –U 2, V lateral view.

http://dx.doi.org/10.4202/app.2011.0124

criodus hesperius Zone and C. transiens Zone. Podolia , Southwestern Sardinia, Guadarrama Mountains ( Spain), New South Wales ( Australia), and Texas.

Caudicriodus hadnagyi ( Chatterton and Perry, 1977) Fig. 10J, L.

1977 Icriodus hadnagyi n. sp.; Chatterton and Perry 1977: 792, pl. 4: 10–22.

2010 Caudicriodus hadnagyi ( Chatterton and Perry, 1977) ; Drygant 2010: 59, pl. 3: 4, 5.

Material.—Five complete Pa elements from the Mytkiv Formation and lower part of the Chortkiv Formation. Sections and samples: 12/2, 18/5, 18/5d, 45/ 185 m, 13/ 260 m.

Remarks.—Podolian specimens differ from the holotype by a bigger size, regular denticulation of the spindle and well developed spur. Platfom enlarged in the posterior half, spindle elongated (0.9–1.1 mm) with 4–5 transverse ridges which are similar in morphology to those in Caudicriodus woschmidti . Postero−lateral process triangular, short and undenticulated. Spur well developed, on line with the postero−lateral process. Inner lobe weakly developed, posteriorly directed. Primary cusp prominent, directed posteriorly. The secondary cusp of the same height or somewhat smaller.

The Podolian Pa elements of the species differ from the closest species Caudicriodus ruthmawsonae by occurrence of prominent cusp, weakly developed inner lobe and expanded basal cavity in its mid part.

Stratigraphic and geographic range.—Upper part of Caudicriodus hesperius Zone and lower part of Caudicriodus transiens Zone ; Podolia and Delorme Formation of Northwestern Canada.