Xanthidium antilopaeum explained

Xanthidium antilopaeum is a species of unicellular desmid in the family Desmidiaceae. It is a common, worldwide species found in acidic waters, particularly the edges of large ponds and lakes.

Description

Xanthidium antilopaeum consists of single cells. Cell are symmetrical, with a deep constriction (called an isthmus) dividing the cell into two identical halves called semicells. Cells are about as broad as long, 42–76 μm long and 40–72 μm wide excluding the spines. Semicells are subelliptical to hexagonal with rounded corners. In each semicell, the four corners are extended into a pair of simple, straight or somewhat curved spines.[1]

Taxonomy

Xanthidium antilopaeum is one of the most polymorphic desmid species. Over 93 infraspecific taxa have been described within X. antilopaeum. According to Šťastný et al., many of these taxa have "no phylogenetic value", but some may be so distinctive to be their own species.[2] One such example is Xanthidium basiornatum (formerly Xanthidium antilopaeum var. basiornatum). This species is distinguished from X. antilopaeum by having spines with a stout base, a central protuberance on the semicells, and a row of the 12-14 small pits located next to the isthmus.[2]

Some other varieties include:

Notes and References

  1. Book: D. M. John . Brian A. Whitton . Alan J. Brook . The freshwater algal flora of the British Isles: an identification guide to freshwater and terrestrial algae. 2002. Cambridge University Press. 978-0-521-77051-4.
  2. 10.1111/jpy.12051 . Polyphasic evaluation of Xanthidium antilopaeum and Xanthidium cristatum (Zygnematophyceae, Streptophyta) species complex . 2013 . Šťastný . Jan . Škaloud . Pavel . Langenbach . Dorothee . Nemjová . Katarína . Neustupa . Jiří . Journal of Phycology . 49 . 2 . 401–416 . 27008526 . 2013JPcgy..49..401S . 23597409 .
  3. Book: Desmids of the Lowlands – Mesotaeniaceae and Desmidiaceae of the European Lowlands. Coesel. Peter. Meesters. Koos. 2007. 978-90-5011-265-9. Zeist, the Netherlands. KNNV Publishing.