Callospiriferina radiata
Creators: name: Macfarlan, Donald Alexander Bankier
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Brachiopoda
Rhynchonellata
Pennospiriferinidae
Callospiriferina
Callospiriferina radiata

description: Callospiriferina radiata (Hector, 1886)
Fig. 8F, Fig. 17: 1–24, Fig. 18: 1–6.
1886 Spiriferina radiata Hector, p. 70, fig. 36 no. 4.
1953 Spiriferina radiata Hector; Marwick, p. 85, pl. 15, fig. 19, 20.
1978 Spiriferina radiata Hector; Suggate et al. p. 713, fig. 11.7 13.
1981 Spiriferina radiata Hector; Speden & Keyes, p. 44, pl. 17.13.
1992 “ Spiriferina ” radiata Hector; Damborenea & Manceñido p. 139, Pl. 2 fig. 6–10.
2009 Mentzelia radiata (Hector, 1886); MacFarlan et al. p. 266.
Neotype. BR 1121, from E45/F 9440, GS337. An internal mould of a ventral valve, with damage to apex and part of posterior. Collected by A. McKay 1878. Designated as neotype by Marwick (1953).
Material. A total of 116 specimens from 11 collections were catalogued, of which 75 yielded valid measurements.
Kawhia Syncline. Dactylioceras band, Kawhia: R 15/f8005 (AU 6425). Paparoa Point, Taharoa: R 16/f6811 (AU 8363). Upper Awakino Valley: R 17/f317 (AU 9490).
Southland Syncline. Heale Ridge: E45/f085 (McF E49). Conical Hill: E45/f9440 (GS 337), E45/f9860 (JDC 1837, McF C8, GS 7736, AU 12474). Otapiri Gorge: E45/f9441 (GS 338), E45/f9553 (JDC 738), E45/f9787 (GS 7257). Lora–Otapiri Divide: E45/f9731 (? GS 7562). Mokoreta River bank, near Wyndham: F46/f9504 (? GS 7562).
Description. Spiriferinide of medium size, wider than long, (ventral valve generally 8–18 mm long, valves 12–25 mm wide). High procline umbo on ventral valve. Hingeline long, straight, with maximum width anterior of hingeline, outline anterior of hingeline rounded.
Dorsal valve with generally rounded outline, moderately convex, with narrow, rounded fold.
Ventral valve hemipyramidal with high umbo, which is generally anterior of the hingeline. Interarea broad, triangular, sulcus shallow, relatively narrow.
Both valves generally with four to six rounded costae on each flank, weakening towards margins. On some specimens the costae are very weak or not developed. Costae crossed by fine growth-lines and foliaceous growth lamellae. No costae in sulcus or fold. Exterior with fine tubular spines, in general only the spine bases are preserved (Fig. 8F). Shell material punctate (Fig.18.6b).
Ventral valve with short, relatively thick, straight, divergent dental plates bounding delthyrium and extending to apex. Median septum high, narrow wall-like, about half of valve length, extending to apex but ending anterior of delthyrium opening, not connected with dental plates (Fig. 17.2a, 17.5a), Delthyrium narrow, triangular, open (Fig. 17.4b, 17.5c).
Dorsal valve with narrow rounded hinge plate, shallow, well-separated sockets. Small round or transversely elongate cardinal process. Some specimens with paired, slightly incised muscle scars separated by low ridge-like median septum (Fig. 17.24).
Dimensions. Dimensions of the neotype and of two Kawhia Syncline specimens, and statistics for specimens from key Southland Syncline areas are shown in Table 6.
Range and distribution. This species is common in the Lower Ururoan of the Otapiri Gorge (Conical Hill and nearby Otapiri Gorge localities, Heale Ridge). Most of the material comes from E45/f9860 (Otapiri Gorge north of Conical Hill) and Heale Ridge (E45/f0085).
It is not recorded from New Caledonia, and only two specimens have been found in the Kawhia Syncline, one from the Dactylioceras band (R15 /f8005 AU 6425) and one from the upper Awakino Valley (R17 /f317, AU 9490).
Remarks. Damborenea & Manceñido (1992) discussed the “ Spiriferina ” radiata – tumida plexus in the Pliensbachian of western Argentina, which involves range of forms that are close to C. radiata and differ at a subspecies level from C. tumida.
description: Published as part of Macfarlan, Donald Alexander Bankier, 2023, Latest Triassic and Early Jurassic Spiriferinida (Brachiopoda) of Zealandia (New Zealand and New Caledonia), pp. 1-58 in Zootaxa 5277 (1) on pages 27-29, DOI: 10.11646/zootaxa.5277.1.1, http://zenodo.org/record/7891491