Pycnoclavella detorta

Pycnoclavella is a genus of sea squirts first circumscribed by Walter Garstang in 1891. The generic name comes from the Ancient Greek πυκνός (puknós) meaning "closely united". In 1990, Patricia Kott placed Pycnoclavella in its own family, Pycnoclavellidae, but in 2008 it was moved back to Clavelinidae.
As of 2018, WoRMS recognizes the following species:

Pycnoclavella arenosa (Kott, 1972)
Pycnoclavella atlantica Pérez-Portela et al., 2007
Pycnoclavella aurantia Kott, 1990
Pycnoclavella aurilucens Garstang, 1891
Pycnoclavella belizeana Goodbody, 1996
Pycnoclavella brava Pérez-Portela et al., 2007
Pycnoclavella communis Pérez-Portela et al., 2007
Pycnoclavella detorta (Sluiter, 1904)
Pycnoclavella diminuta (Kott, 1957)
Pycnoclavella elongata Kott, 1990
Pycnoclavella filamentosa Kott, 2005
Pycnoclavella flava (Monniot F., 1988)
Pycnoclavella inflorescens Kott, 2005
Pycnoclavella kottae Millar, 1960
Pycnoclavella martae Perez-Portela & Turon, 2008
Pycnoclavella minuta Millar, 1953
Pycnoclavella nana (Lahille, 1890)
Pycnoclavella narcissus Kott, 2005
Pycnoclavella neapolitana (Julin, 1904)
Pycnoclavella producta (Milne Edwards, 1841)
Pycnoclavella stanleyi Berrill & Abbott, 1949
Pycnoclavella...