Lehnert Helmut, Stone Robert P
Eichenstr. 14, 86507 Oberottmarshausen, Germany GeoBio-Center LMU München, Richard-Wagner-Str. 10, 80333 München, Germany.
Zootaxa. 2020 Sep 9;4851(1):zootaxa.4851.1.5. doi: 10.11646/zootaxa.4851.1.5.
Three new species from the Aleutian Islands are described. Echinoclathria seguama n. sp. has only four congeners in the region, it is closest to E. vasa and differs from it in the dimensions of all spicule categories. Stelodoryx jamesorri n. sp. is unusual as it has a plumoreticulate choanosomal skeleton instead of the usual reticulate arrangement in other Stelodoryx. To accommodate the species in Stelodoryx we amend the genus definition accordingly. Choanosomal styles, common in Stelodoryx, tend to merge into strongyloxeas in S. jamesorri. Additionally, spicule dimensions deviate from other congeners of the region. The tendency of replacing choanosomal styles by strongyloxeas goes even further in Stelodoryx strongyloxeata n. sp. which has very conspicuous, thick, fusiform strongyloxeas, that differ, apart from being strongyloxeas, also considerably in size from the styles of other species. S. strongyloxeata n. sp. also has style-like tornotes, a characteristic that it shares with S. siphofuscus, but dimensions of style-shaped tornotes are different.
本文描述了来自阿留申群岛的三个新物种。Echinoclathria seguama新物种在该地区仅有四个同属物种，它与E. vasa最为接近，但在所有骨针类别的尺寸上与之不同。Stelodoryx jamesorri新物种不同寻常，因为它具有羽状网状的中胶层骨骼，而非其他Stelodoryx物种常见的网状排列。为了将该物种归入Stelodoryx属，我们相应地修订了属的定义。在Stelodoryx中常见的中胶层柱体，在S. jamesorri中倾向于合并为强壮骨针。此外，骨针尺寸与该地区的其他同属物种不同。用强壮骨针取代中胶层柱体的趋势在Stelodoryx strongyloxeata新物种中更为明显，该物种具有非常明显、粗壮、梭形的强壮骨针，除了是强壮骨针外，其尺寸也与其他物种的柱体有很大差异。S. strongyloxeata新物种还具有类似柱体的撕裂骨针，这一特征与S. siphofuscus相同，但类似柱体的撕裂骨针尺寸不同。
