Protobranchia Pelseneer 1889
Creators: name: Gofas, Serge
name: Luque, Ángel A.
name: Oliver, Joan Daniel
name: Templado, José
name: Serrano, Alberto
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Bivalvia

description: Key to genera and species of Protobranchia found on GB
See also Killeen & Turner (2009) for identification of many North Atlantic Yoldiella Verrill & Bush, 1897 and Ledella Verrill & Bush, 1897 species not found in the present material.
1. Hinge plate narrowing but not interrupted under the umbo, with teeth forming a continuous series ........................................................................................................................................................... 2
– Hinge plate interrupted beneath the umbo by a ligamental pit ......................................................... 3
2. Outline regularly oval, longer than high ................... Tindaria sericea (Jeffreys, 1876) (Fig. 31G‒I)
– Outline rounded anteriorly and tapering posteriorly .......................................................................... .............................................................. Pseudoneilonella latior (Jeffreys, 1876) [not found on GB]
3. Outline triangular with rounded ends; inside of shell nacreous ....................................................... 4
– Outline rounded, oval, or with anterior end rounded and posterior end tapering; inside of shell not nacreous ........................................................................................................................................... 6
4. Ventral margin smooth ................................. Ennucula corbuloide s (Seguenza, 1877) (Fig. 31E‒F)
‒ Ventral margin crenulated by the termination of internal rods ......................................................... 5
5. Shell plump, externally with fine radial microsculpture ..................................................................... ................................................................................ Nucula atacellana Schenck, 1939 (Fig. 31C‒D)
– Shell rather compressed, sculpture mostly commarginal ................................................................... ..................................................................................... Nucula tumidula Malm, 1861 (Fig. 31A‒B)
6. Posterior end acute or more or less angular ...................................................................................... 7
– Posterior end rounded, even if somewhat tapering ........................................................................... 8
7. Posterior end acute, umbo anterior to vertical midline ....................................................................... ........................................................................... Ledella messanensis (Jeffreys, 1870) (Fig. 32A‒B)
– Posterior end bluntly angular, umbo posterior to vertical midline ..................................................... ...................................................................................... Ledella cf. orixa (Dall, 1927) (Fig. 32C‒D)
8. Shell less than 2 mm, white, rounded in outline ................................................................................. .......................................................................... Pristigloma minima (Seguenza, 1877) (Fig. 31J‒K)
– Shell larger, definitely longer than high ............................................................................................ 9
9. Shell inflated, posteriorly tapering .................... Yoldiella semistriata (Jeffreys, 1879) (Fig. 32G‒H)
– Shell very compressed, posterior part broadly rounded ..................................................................... .......................................................... Yoldiella valorousae Killeen & J. A. Turner, 2009 (Fig. 32I‒J)
description: Published as part of Gofas, Serge, Luque, Ángel A., Oliver, Joan Daniel, Templado, José & Serrano, Alberto, 2021, The Mollusca of Galicia Bank (NE Atlantic Ocean), pp. 1-114 in European Journal of Taxonomy 785 (1) on page 75, DOI: 10.5852/ejt.2021.785.1605, http://zenodo.org/record/5798418