Scaphander costatus (Gabb, 1864) Figure 6 O–P

Cylichna costata Gabb, 1864: 143, pl. 2, fig. 107.

Type locality.

Martinez, Contra Costa County, California, USA; stratum: Tejon Formation s. l.; age: Eocene.

Type material.

Lectotype, ANSP IP4338 (designation by Stewart 1926: 437, pl. 27, fig. 3; see also Richards 1968: 118); paralectotypes, ANSP IP79477, 8 shells.

Remarks.

Type species of subgenus Mirascapha Stewart, 1927.

Current taxonomic status.

Scaphander (Mirascapha) costatus (Gabb, 1864) (Squires 1984).

Species transferred to other gastropod groups

Here are listed the species (with type material in the ANSP collection) that were originally classified in “Architectibranchia” and Cephalaspidea, but that actually do not belong to them. Some of them have already undergone taxonomical revision and are listed concisely in Table 1, while others are reclassified below.