|Observations on marine heterotardigrada, including a new genus from the Western Atlantic Ocean|
Pollock, L.W. (1975). Observations on marine heterotardigrada, including a new genus from the Western Atlantic Ocean. Cah. Biol. Mar. 16(1): 121-132
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
Systematic and ecological observations are presented on 2 spp of Heterotardigrada. In the Oreellidae, a new gen and sp is described and the morphology and ecology of a cosmopolitan species is presented. Morphology and ecology of Echiniscoides sigismundi living on intertidal barnacles at Woods Hole is discussed. Mprphological features include triangular folds of cuticle flanking anus, dimorphism in gonopore shape and location, and presence of one less claw on legs IV than on legs I-III (a major point of similarity to Anisonyches, below).Ontogenetic changes include increase in claws per leg and delayed appearance of cuticular anal ridges and gonopores. Comparable densities ofE. Sigismundi occurred on plates of living and dead barnacles - plates merely providing substratum. Uneven distribution of tardigrades among plates comprising single dead barnacles viually correlated with distribution of green and blue-green algae. Longitudinal compartments between barnacle plate lamellae and opercular plates were favored microhabitats. Anisonyches diakidius gen. Et sp. n. is described from the Bahamas. The generic diagnosis: unplated Echiniscoidea with 4 claws each on lst 3 pairs of legs and 3 claws on each of 4 pair of leggs. Specific diagnosis: Anisonyches with 2 basal spurs on each claw; papillae present on base of 4 th pair of legs only.