Thecidellina maxilla (Hedley, 1899)

Bitner, Maria Aleksandra, 2009, Recent Brachiopoda from the Norfolk Ridge, New Caledonia, with description of four new species, Zootaxa 2235, pp. 1-39 : 17-18

Thecidellina maxilla (Hedley, 1899)

( Fig. 12 )

This is one of two thecideide brachiopods in the studied material. All thecideides are small, living cemented directly to the substratum by their ventral valve. Thecidellina maxilla is reported for the first time from the Norfolk Ridge but was already noted from the vicinity of the island of New Caledonia ( Laurin 1997; Bitner 2007a). It was found in two samples from Crypthelia seamount and in one sample from Kaimon Maru (see Tables 1, 2) at 200–392 m ( Fig. 14 ). Thecidellina maxilla is widely distributed in the Western and Central Pacific ( Thomson 1927; Cooper 1954; Pajaud 1970; Zezina 1985; Lee & Robinson 2003; Bitner 2007b, 2008).

Figures

FIGURE 12. Thecidellina maxilla (Hedley, 1899), Norfolk Ridge, Norfolk 1 Stn DW 1723, 266 – 267 m: A, B, dorsal views of complete specimens, visible flat, triangular interarea with regular growth lines, MNHN BRA- 3170 – 3171; C, D, inner views of dorsal valves, MNHN BRA- 3172 – 3173; E-H, inner and posterior views of dorsal valves to show cardinal process nearly fused with median part of the brachial bridge, MNHN BRA- 3174 – 3175; I, J, inner and tilted views of ventral valve, visible hemispondylium consisting of two slender prongs, MNHN BRA- 3176. All SEM.

FIGURE 14. Depth ranges of particular brachiopod species collected during the Norfolk 1 and Norfolk 2 cruises to the Norfolk Ridge, New Caledonia.