Schizophoria (S.) sp.

Fig. 3A.

Material.—The figured partial ventral valve NYSM 15701.

Remarks.—A single partial ventral valve representing Schizophoria (S.) sp. was recovered from Hanover Shale shell bed. The exfoliated ventral valve does not permit a definite species assignment, although it features molds of the impressed bilobate diductor scars (Fig. 4A) divided by a medial ridge (site of adductor attachment) extending 2–3 mm beyond the diductor muscle field. The only Late Devonian species of Schizophoria described from New York with the ventral medial adductor ridge extending well beyond the diductor scars is S. (S.) impressa (Hall 1867: pl. 8: 11–19).