The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz Author Lambert, Gretchen text Zootaxa 2019 2019-08-20 4657 3 401 436 journal article 25983 10.11646/zootaxa.4657.3.1 3414318d-7570-49ac-9013-be4e1f1e6347 1175-5326 3371886 86DD93B2-E8F4-4174-B105-9436357CB4B6 Euherdmania claviformis ( Ritter, 1903 ) Figure 9 E–F IHAK 60 BHAK 3243, 1738 UF 2549. Rattenbury Pinnacle, Scuba, 17–20 m . RHAK 6 BHAK 0995. Low rocky intertidal. Tubes 6 cm long. Clumps of long thin colorless zooids usually almost completely encrusted and embedded with grey sand, each zooid separate except at the common base formed from tightly interwoven branching basal stolons. Sometimes the anterior individual tubes are clear of sand ( Fig. 9F ). The thorax is comprised of 12 rows of very short stigmata. The esophageal region is very extended, with the ridged stomach (about six or seven plications) near the posterior end, followed by the testes and the heart. Ritter (1903) described this species in great detail, so impressed by its difference from all other known colonial ascidians that he established a new family and genus for it. While Ritter himself had to change the family and genus names due to their being preoccupied ( Ritter 1904 ), this single genus family is still recognized as unusual, and contains only a few species. A detailed morphological description is also given by Van Name (1945) ; Trason (1957) described the larva and early post–settlement development. The present study extends the distribution from California ( Abbott & Newberry 1980 ; Abbott et al . 2007 ) northward to Washington (unpublished observations) and British Columbia (present study).