Monotheca obliqua (Johnston, 1847)

Watson, Jeanette E., 2011, Review of the genus Monotheca (Hydrozoa: Leptolida) from Australia with description of a new species and a note on Monothecella Stechow, 1923, Memoirs of Museum Victoria 68, pp. 71-91 : 83

Monotheca obliqua , measurements (µm)

Hydrorhiza, width 70–88

Stem length of internode 200–320 width at distal node 40–60

Apophysis length of adcauline wall 26–58 width at distal shoulder (node) 40–70

Hydrocladium length of athecate internode 56–80 width at distal node 42–60 length of thecate internode 160–104

Hydrotheca length of abcauline wall 140–200 length of of adcauline wall 80–148 depth, floor to margin tip 180–200 width at rim 160–180

Nematotheca total length of lateral 52–60 diameter of cup 42–48 length of median 48–52 diameter of cup 26–28

Gonotheca length, including pedicel 1240–1580 width at margin 640–1100

Remarks. Monotheca obliqua is a well-known species with worldwide distribution. Mulder and Trebilcock (1910, 1916) briefly described material collected from Bream Creek on the Bass Strait coast and Corio Bay in Port Phillip, commenting on the slenderness of the base of the median inferior nematotheca, the small axillar hydrostatic pore and the abcauline flange connecting the base (prehydrothecal chamber) of the hydrotheca to the internode.

Although widely distributed across the south and east of the continent, M. obliqua is not a common species in Australia.

Type locality. British Isles.

Known distribution. Cosmopolitan; southern Australia to Queensland .