Triassospathodus homeri ( Bender, 1970 )

Leu, Marc, Bucher, Hugo, Vennemann, Torsten, Bagherpour, Borhan, Ji, Cheng, Brosse, Morgane & Goudemand, Nicolas, 2022, A Unitary Association-based conodont biozonation of the Smithian-Spathian boundary (Early Triassic) and associated biotic crisis from South China, Swiss Journal of Palaeontology (19) 141 (1), pp. 1-61 : 41

Triassospathodus homeri ( Bender, 1970)

Figs. 19C ; 23C, F, G ; 24A, D, G, H

*1970 Spathognathodus homeri n. sp.; Bender, p. 528, pl. 5, figs. 16a–c.

1970 Neospathodus homeri (Bender) ; Sweet, p.245, pl. 1, figs. 2, 3, 9, 10.

1980 Neospathodus homeri (Bender) ; Chhabra & Sahni, pl. 1, figs. 28 (only).

1983 Neospathodus homeri (Bender) ; Matsuda, p. 94–95, pl. 4, figs. 3, 4, 5.

1986 Neospathodus homeri (Bender) ; Durkoop et al., pl. 20, figs. 8a–d.

1995 Neospathodus homeri (Bender) ; Orchard, p. 115, figs. 2.1–2.3, 2.7–2.9, 2.14–2.17, 2.20, 2.21.

2005 Triassospathodus homeri (Bender) ; Orchard, p. 93, figs. 19.

2007 Triassospathodus ex. gr. homeri (Bender) ; Lucas & Orchard, p. 123, figs. 7.8, 7.9.

2007b Triassospathodus ex. gr. homeri (Bender) ; Orchard et al., p. 353, figs. 6, nr. 10–12.

2011 Neospathodus homeri (Bender) ; Ji et al., p. 220, figs. 3.9a, b, c.

2014 Triassospathodus homeri (Bender) ; Maekawa & Igo in Shigeta et al., p. 253, figs. 181.43–181.48.

2015 Triassospathodus homeri (Bender) ; Chen et al., figs. 7.13, 8.18, 9.14, 9.19.

2015 Novispathodus abruptus (Orchard) ; Chen et al., figs. 7.16–7.17, 9.16.

2019 Triassospathodus homeri (Bender) ; Chen et al., fig. 7, nr. 1.

2019 Triassospathodus symmetrucis [sic.] (Orchard); Liu et al., p. 12, pl. 2, fig. 11.

2021 Novispathodus abruptus (Orchard) ; Chen et al., fig. 4.3.

2021 Triassospathodus homeri (Bender) ; Chen et al., fig. 4.15, 4.16 (only).

Number of specimens:>30

Diagnosis. “Species with segminate elements that have a length:height ratio of 2.5–3:1, and commonly 15–18 subequal, moderately fused denticles that are increasingly reclined toward the posterior end where 3–5 small, low denticles occur on a short, variably inturned process. Te posterior edge of the blade is moderately reclined. In basal outline, the basal cavity is elliptical, tapers in both anterior and posterior directions, and is strongly asymmetrical in specimens with an inturned posterior process.” ( Orchard, 1995).

Remarks. Tis species may be slightly younger than the closely related Tr. symmetricus .

Occurrence. Worldwide distribution. Nanpanjiang basin: North-eastern Vietnam, Bac Tuy Formation, Tirolites beds ( Shigeta et al., 2014). South China, ( Orchard et al., 2007b, this study). Northern Indian margin: Kashmir ( Matsuda, 1983). Jabal Safra, Oman ( Orchard, 1995). Salt Range, Pakistan ( Sweet, 1970). Western USA: Lower Spathian interval of Taynes Group ( Tirolites beds, Lucas & Orchard, 2007).

Figures

Fig. 19 Novispathodinae from Qiakong,Laren and Lilong. Magnification is ×80.The scale bar is 400 μm. All elements are considered to be P1 elements if not specifically identified otherwise. A Novispathodus cf.brevissimus (Orchard); LIL515C,PIMUZ 39199. B, F Novispathodus brevissimus (Orchard); B LIL515B, PIMUZ 39200; F BAN1, PIMUZ 39201. C Triassospathodus homeri (Bender); LIL515D,PIMUZ 39317. D, H Novispathodus?brevissimus (Orchard); D LIL515D,PIMUZ 39202; H LIL514A, PIMUZ 39203. E Triassospathodus cf.homeri (Bender); LIL515C, PIMUZ 39318. G, K, O–Q Novispathodus n. sp. A; G LIL504,PIMUZ 39251; K LIL504,PIMUZ 39252; O LIL505, PIMUZ 39253; P LIL505, PIMUZ 39254;Q LIL505,PIMUZ 39255. I, L, M, Triassospathodus symmetricus (Orchard); I QIA141, PIMUZ 39336; L LIL512, PIMUZ 39337; M LIL514A, PIMUZ 39338. J Novispathodus ex gr.pingdingshanensis (Zhao & Orchard); QIA138, PIMUZ 39237. N Triassospathodus cf. symmetricus; LIL514B, PIMUZ 39339.R Novispathodus praebrevissimus n.sp; LIL505, PIMUZ 39289

Fig. 23 Novispathodinae from Qiakong,Laren, Shanggang and Lilong. Magnification is × 80.The scale bar is 400 μm. All elements are considered to be P1 elements if not specifically identified otherwise. A, B, D, E, H, I, Triassospathodus symmetricus (Orchard); A, LIL509, PIMUZ 39320; B, LIL509, PIMUZ 39321; D, QIA202,PIMUZ 39322; E,LIL509, PIMUZ 39323;H, LIL509, PIMUZ 39324; I, BAN2, PIMUZ 39325. C, F, G, Triassospathodus homeri (Bender); C, LAR231C, PIMUZ 39310; F, QIA155, PIMUZ 39311; G, SHA318,PIMUZ 39312

Fig.24 Novispathodinae and uncertain from Qiakong,Laren,Shanggang,and Lilong. Magnification is×80.The scale bar is 400 μm.All elements are considered to be P1 elements if not specifically identified otherwise.A, D, G, H Triassospathodushomeri (Bender);A LIL515C,PIMUZ 39313;D QIA155,PIMUZ 39314;G LIL513B,PIMUZ 39315;H LIL515B,PIMUZ 39316.B, E, F Triassospathodus aff.symmetricus (Orchard);B QIA138,PIMUZ 39306;E LIL505,PIMUZ 39307; F QIA136,PIMUZ 39308.C, I–Q Triassospathodussymmetricus (Orchard);C QIA140,PIMUZ 39326;I SHA313,PIMUZ 39327;J QIA143,PIMUZ 39328;K QIA144, PIMUZ 39329;L QIA141,PIMUZ 39330;M LIL515D,PIMUZ 39331;N LIL509,PIMUZ 39332;O LIL513B,PIMUZ 39333;P LIL513B,PIMUZ 39334;Q LIL513A, PIMUZ 39335.R–T Aduncodina unicosta (Ding);R BAN5,PIMUZ 39100;S SHA320,PIMUZ 39101;T SHA318,PIMUZ 39102