ECHINISCOIDIDAE KRISTENSEN &, 1980

Møbjerg, Nadja, Jørgensen, Aslak & Kristensen, Reinhardt M., 2020, Ongoing revision of Echiniscoididae (Heterotardigrada: Echiniscoidea), with the description of a new interstitial species and genus with unique anal structures, Zoological Journal of the Linnean Society 188 (3), pp. 663-680 : 668

publication ID	https://doi.org/10.1093/zoolinnean/zlz122
DOI	https://doi.org/10.5281/zenodo.4623675
persistent identifier	https://treatment.plazi.org/id/AA47465C-3D39-FF89-29CB-FE23FD895DB4
treatment provided by	Valdenar (2021-03-19 16:18:42, last updated 2024-11-27 11:47:44)
scientific name	ECHINISCOIDIDAE KRISTENSEN &
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FAMILY ECHINISCOIDIDAE KRISTENSEN & View in CoL HALLAS, 1980

Diagnosis (amended): Unplated, marine Echiniscoidea . Adults with supernumerary claws (six to 13) on each leg. Secondary clava (papilla cephalica) domeshapedor almostflat (indistinct). Median cephalic cirrus always absent. Other cephalic appendages and leg appendages small (reduced). Cirri Aand E similar in both structure and length. The fourth leg sensory structure is papillar, as is the primary clava. Stylet sheath present; stylet supports always absent. Seminal receptacles lacking. External fertilization of the smooth eggs. Anal system consists of two lateral lobes and a terminal lobe. The anal opening is located in front of the terminal lobe.

Type genus: Echiniscoides Plate, 1889 View in CoL .

Discussion: The family Echiniscoididae consists of two subfamilies: Echiniscoidinae and Isoechiniscoidinae . The presence of supernumerary (six to 13) claws in adults is not seen in any other heterotardigrades. Seminal receptacles are never present in Echiniscoididae , but within Echiniscoidea seminal receptacles are found in Oreella Murray, 1910 ( Binda & Kristensen, 1986; Dastych et al., 1998).

References

Binda MG, Kristensen RM. 1986. Notes on the genus Oreella (Oreellidae) and the systematic position of Carphania fluviatilis Binda, 1978 (Carphanidae fam. nov., Heterotardigrada). Animalia 13: 9 - 20.

Dastych H, McInnes SJ, Claxton SK. 1998. Oreella mollis Murray, 1910 (Tardigrada): a redescription and revision of Oreella. Mitteilungen aus dem Hamburgischen Zoologische Museum und Institut 95: 89 - 113.

Kristensen RM, Hallas TE. 1980. The tidal genus Echiniscoides and its variability, with erection of Echiniscoididae fam. n. (Tardigrada). Zoologica Scripta 9: 113 - 127.