Thecidellina maxilla ( Hedley, 1899 )

Robinson, Jeffrey H., 2021, Description and Figures of New Lectotype and Paralectotype Material of Recent Brachiopod Thecidellina maxilla (Hedley, 1899), Records of the Australian Museum (Rec. Aust. Mus.) 73 (5), pp. 137-146 : 140

Thecidellina maxilla ( Hedley, 1899)

Figs. 2–6

Thecidea maxilla HedleY, 1899: 494, 508–510, fig. 57.

Thecidellina maxilla .— Thomson, 1915: 462.— Dall, 1920: 283.— Cooper, 1954: 315, 317–318, pl. 81, figs 1–10.— Cooper, 1964: 1118–1120.— Pajaud, 1970: 240, figs 22, 102B.— Cooper, 1978: 15.— d’Hondt, 1987: 33, 41, pl. 5, figs 1–5.— Lee, 1990: 273, fig. 2.— Laurin, 1997: 412, 413, 416, 453–454, fig. 40a–b.— Brook, 1998: 239, 256.— Lee & Robinson, 2003: 350–352, figs 28–35.— Lüter & Sieben, 2005: 184.— Bitner, 2007a: 498–499, fig. 3a–h.— Bitner, 2007b: 171.— Bitner, 2008: 451, fig. 19.— Bitner, 2009: 12 , fig. 12.— Hoffmann, Klann & Matz, 2009: 341, 348, 349.— Hoffmann & Lüter, 2010: 2.— Bitner, 2010: 643, 651–654, fig. 5G–J, tab. 1.— Peck & Harper, 2010: 2209, 2210.— Baker & Logan, 2011: 111, 121.— Simon & Hoffmann, 2013: 402.— Bitner, 2014: 245, 247, 259, 261, fig. 11A–I, tab. 4, appendix.— Bitner, 2015: 42, 43, fig. 5A–E, appendix.— Simon et al., 2018: 482, 492–493, 494, 498.— Bitner, 2019: 600, fig. 7C–E.

Thecidellina cf. T. maxilla Cooper, 1964: 1118 , pl. 301, figs 15–16, 18–19.— Robinson, 2017: 7–9, fig. 2E–F, tab. 4.

Thecidellina australis maxilla Pajaud, 1970: 47 , 240, 241, 312, figs 22, 107.

Stratigraphic range: Miocene to Recent

Material has been identified as T. maxilla or cf. T. maxilla from the EarlY Miocene of Java ( Cooper, 1978) and of New Zealand ( Robinson, 2017), the post-Miocene of the Marshall Islands ( Cooper, 1964), the Pliocene of the Chatham Islands ( Lee & Robinson, 2003) and the Pleistocene of the Kermadec Islands ( Brook, 1998).

Figures

Figure 2. Thecidellina maxilla.(A–B) Scan of illustrations from HedleY (1899).(A) Illustration of a dorsal valve interior with tinY cardinal process. (B) Illustration of a ventral valve interior with tubercles on valve floor and long hemispondYlium prongs.(C) AM C.006202; SLR camera image of interior of dorsal valve with a wide, concave septum and small canopY spicules (note the missing valve posterior). (D) SLR camera image of interior of the ventral valve showing tuberculate valve floor and the posterior part of the dorsal valve still attached.

Figure 3. Thecidellina maxilla lectotYpe AM C.593654 (except C). (A) Ventral valve interior with tubercles. (B) Exterior of ventral valve with cementing surface underneath. (C) AM C.593657; exterior of ventral valve with cementing surface at posterior. (D) Close-up of cup-shaped hemispondYlium. (E) Exterior of dorsal valve. (F) Interior of dorsal valve with spicules over the brachial chamber and no calcitic connections between brachial bridge and intrabrachial ridge. (G) Lateral view of dorsal valve interior. (H) Close-up of tip of septum, marsupial orifices and ovarial notches. (I) Close-up of tubercles at base of septum and on anterior margin. (J) Posterior view of dorsal interior with calcitic pole attached to brachial bridge and base of cardinal process.Abbreviations: ci, cicatrix; cp, calcitic pole; mo, marsupial orifice; on, ovarial notch.

Figure 4. Thecidellina maxilla AM C.593655. (A) Ventral valve interior with tubercles on valve floor and long hemispondYlium prongs reaching past the teeth. (B) Dorsal valve interior with partiallY fused spicule canopY. (C) Dorsal valve interior with brachial bridge and calcitic pole broken off showing triangular base. (D) Lateral view of dorsal valve interior with prominent septum blade. (E) Close-up of partiallY infilled spicule canopY. (F) Close-up of broken base of calcitic pole and verY fine median spur on the cardinal process. Abbreviations: cpb, calcitic pole base; ms, median spur.

Figure 5. Thecidellina maxilla AM C.593656. (A) Ventral valve interior with tubercle-ridges and cup-shaped hemispondYlium. (B) Close-up of cup-shaped hemispondYlium, free from valve floor.(C) Dorsal valve interior with sparse canopY spicules.(D) SlightlY oblique dorsal valve interior.(E) Lateral view of dorsal valve interior with prominent blade on septum. (F) Close-up of tubercles at base of septum and on anterior margin. (G) Close-up of septum tip, marsupial orifice and ovarial notches. (H) Oblique close-up of curved calcitic pole attached to brachial bridge. (I) Posterior view of dorsal interior, calcitic pole divides visceral foramen, wide visceral gap without calcitic connections. Abbreviations: cp, calcitic pole; tr, tubercle-ridge; vg, visceral gap.

Figure 6. Thecidellina maxilla AM C.593657. (A) Ventral valve interior. (B) Close-up of hemispondYlium. (C) SlightlY oblique view of dorsal valve interior. (D) Lateral view of dorsal valve interior. (E) Close-up of tip of septum, marsupial orifice, calcitic pole and ovarial notches. (F) Brachial cavitY with stubbY spicules (male specimen?). (G) Posterior of dorsal valve. (H) Close-up of calcitic pole joining the thin median spur on the cardinal process. (I) Lateral adductor muscle scar on right of cardinal process. Abbreviations: cc, calcitic connections.