Tetrachaelasma southwardi Newman & Ross, 1971. A. Specimen (MACN-In 44478e) attached to a rock; B. Scuta of specimen (MACN-In 44478p) with serpulid tubes (Polychaeta); C. Specimen (MACN-In 44478u) with Alcyonium sp. (Octocorallia) epibiont; D. Group of four specimens (MACN-In 44478h–k); E. Isolated rostral plate (MACN-In 44479i) with a Regioscalpellum sp. (Scalpellidae) on it; F. Specimen (MACN-In 44479c) with a rounded mark left by another specimen attached to it. Bathylasma Newman & Ross, 1971. G. Specimen (MACN-In 44480) with a T. southwardi specimen attached to it and a rounded mark left by a second balanomorph barnacle. Abbreviation: rm – rounded mark.

 
 
  Part of: Chiesa IL, Pereira E, Roccatagliata D (2024) On the occurrence of the deep-sea barnacle Tetrachaelasma southwardi Newman & Ross, 1971 (Cirripedia, Balanomorpha, Bathylasmatidae) in the Mar del Plata Submarine Canyon, Argentina: supplementary description and taxonomic remarks on the genus. Zoosystematics and Evolution 100(2): 603-623. https://doi.org/10.3897/zse.100.118912