The nudibranch is one of the most colorful gastropod species found in oceans worldwide. Unlike many other gastropod groups, the nudibranch loses an external shell in the adult stage, but instead develops various chemical defense systems. More than 2,500

Illustrated species account of Crepidula fornicata (Linnaeus, 1758) Mollusca, Littorinimorpha. left) https://flic.kr/p/iHTKuN Male on larger female. Reniform outline. Body whorl forms almost all of shell. Thin, wavy red-brown lines radiate from small

Revised, illustrated species account of Lacuna pallidula (da Costa, 1778) Identification and Biology, (Mollusca, Littorinimorpha). If previous version downloaded please delete it. https://flic.kr/p/2kNL1A2 Lacuna parva shell is white often with three

Illustrated species account of Trivia arctica (Pulteney, 1799) (Mollusca, Littorinimorpha). Includes the possibly first published images of a female positioning an egg capsule. https://flic.kr/p/Cfnfpb Heights 8.7 mm, 9.6 mm, 11.2 mm; typical adult sizes