Definitions

(Taxon-specific: Family Pycnogonidae) Noncellular, multilayered structure forming outer layer of body and lining esophagus and hindgut; relatively thin and not calcified. Secreted by epidermis. [Stachowitsch, 1992]
Noncellular, multilayered, relatively thick layer forming exoskeleton and endoskeleton and lining foregut and hindgut. Secreted by epidermis. [Stachowitsch, 1992]
Noncellular, multilayered layer forming exoskeleton and lining foregut and hindgut. (smooth, spinose, with plate-like projections). [Stachowitsch, 1992]
(Taxon-specific: Family Cyatholaimidae) Noncellular, multilayered, relatively thick layer forming exoskeleton and lining both foregut and hindgut. Secreted by epidermis. Forms plate-like structures (cephalic shield, sternites, tergites). [Stachowitsch, 1992]
Noncellular, multilayered structure forming outer layer of body and lining foregut (stomodeum) and hindgut (proctodeum); relatively thin and pigment-free. Secreted by epidermis. [Stachowitsch, 1992]
Noncellular, multilayered, relatively thick layer forming valved, endoskeleton, and exoskeleton, and lining foregut and hindgut. Secreted by epidermis. [Stachowitsch, 1992]
Noncellular, multilayered outer layer of body; secreted by epidermis and equipped with numerous pores and sensory organs. Also lines foregut and joining dorsal brain to ventral nerve cords. [Stachowitsch, 1992]