Cuspidarioidea, Dall, 1886

Gofas, Serge, Luque, Ángel A., Oliver, Joan Daniel, Templado, José & Serrano, Alberto, 2021, The Mollusca of Galicia Bank (NE Atlantic Ocean), European Journal of Taxonomy 785 (1), pp. 1-114 : 86-87

Key to genera and species of the superfamily Cuspidarioidea found on GB

1. Sculpture with definite radial ribs ..................................................................................................... 2

– Sculpture only commarginal (may include faint ridges from umbo to posterior part), or surface of shell smooth .................................................................................................................................. 3

2. Two strong radial ribs on posterior half, anterior with commarginal undulations .............................. .................................................................................. Myonera paucistriata Dall, 1886 ( Fig. 41A‒C )

– Numerous fine radial ribs on posterior half ...... Cardiomya cadiziana M. Huber, 2010 ( Fig. 41G‒I )

3. Posterior rostrum short and stout ...................................................................................................... 4

– Posterior rostrum tapering ................................................................................................................ 6

4. Shell inflated, smooth and glossy ................. Jeffreysomya truncata (Jeffreys, 1882) ( Fig. 41D‒F )

– Shell compressed, with marked growth lines and wrinkles on posterior part .................................. 5

5. An anterior lateral tooth on the right valve ......................................................................................... ........................................................... Protocuspidaria verityi Allen & Morgan, 1981 ( Fig. 43 D‒G )

– No teeth on either valve .................. Protocuspidaria simplis Allen & Morgan, 1981 ( Fig. 43 H‒K )

6. Hinge of right valve with a small knob-like cardinal and no lateral teeth; posterior rostrum pointed, not definitely distinct from rest of the shell .... Halonympha depressa (Jeffreys, 1882) ( Fig. 43 A‒C )

– Hinge of right valve with at least one (posterior) lateral tooth ............................................................7

7. Hinge of right valve with anterior and posterior lateral teeth (genus Rhinoclama) ......................... 8

– Hinge of right valve with only a posterior lateral tooth ...................................................................... ....................................................................... Cuspidaria cf. rostrata (Spengler, 1793) ( Fig. 42G‒I )

8. Posterior part of shell (excluding rostrum) with widely spaced commarginal cordlets; anterior lateral long and lamellar ...................................... Rhinoclama semistrigosa (Jeffreys, 1882) ( Fig. 42D‒F )

– Posterior part of shell (excluding rostrum) with growth lines only; anterior lateral short and bulging ................................................................... Rhinoclama teres (Jeffreys, 1882) ( Fig. 42A‒C )

Figures

Fig. 41. Cuspidariidae. A–C. Myonera paucistriata Dall, 1886, BANGAL 0711, V10, 1720 m, 11.6 mm, 10.5 mm and 12.2 mm. D–F. Jeffreysomya truncata (Jeffreys, 1882), BANGAL 0711, V4, 744 m, 7.9 mm and 7.5 mm. G–I. Cardiomya cadiziana Huber, 2010, BANGAL 0711, V6, 909 m, 12.0 mm, 11.6 mm and 12.2 mm. Scale bars = 1 mm.

Fig. 43. Halonymphidae, Protocuspidariidae. A–C. Halonympha depressa (Jeffreys, 1882), BANGAL 0711, V2, 1706 m, 6.5 and 6.8 mm. D–F. Protocuspidaria verityi Allen & Morgan, 1981, BANGAL 0711, V2, 7.3 and 6.4 mm. G. Detail of the hinge of the right valve (same as E), the arrow points to the diagnostic anterior tooth. H–J. Protocuspidaria simplis Allen & Morgan, 1981, BANGAL 0711, V10, 1720 m, 9.0 mm, 10.1 mm. K. Detail of the hinge of the right valve (same as I), without tooth. Scale bars = 1 mm.

Fig. 42. Cuspidariidae. A–C. Rhinoclama teres (Jeffreys, 1882), BANGAL 0711, V5, 1631 m, 12.8 mm and 10.6 mm. D–F. Rhinoclama semistrigosa (Jeffreys, 1882), BANGAL 0711, V7, 1462 m, 9.1 and 8.7 mm. G–I. Cuspidaria cf. rostrata (Spengler, 1793), BANGAL 0711, V3, 818 m, 14.6 and 15.2 mm. Scale bars = 1 mm.