Schizotricha profunda ( Nutting, 1900 ), Nutting, 1900

Peña Cantero, Álvaro L. & Horton, Tammy, 2017, Benthic hydroids (Cnidaria, Hydrozoa) from bathyal and abyssal depths of the Northeast Atlantic held in the modern Discovery Collections, Zootaxa 4347 (1), pp. 1-30: 20

publication ID

https://doi.org/10.11646/zootaxa.4347.1.1

publication LSID

lsid:zoobank.org:pub:176D72B0-0DD6-4D51-83CA-D47C2268A3CF

DOI

http://doi.org/10.5281/zenodo.5248592

persistent identifier

http://treatment.plazi.org/id/03F0943B-FFCF-4D07-0BF8-FDEBFA9C1675

treatment provided by

Plazi

scientific name

Schizotricha profunda ( Nutting, 1900 )
status

 

Schizotricha profunda ( Nutting, 1900)  

( Fig. 8 View FIGURE 8 )

Plumularia profunda Nutting, 1900: 66   –67, pl. 8 figs 2–3.

Not Polyplumaria profunda   — Broch, 1918: 60 –62, figs 28–29 [= Schizotricha variabilis (Bonnevie, 1899)   ]. Schizotricha profunda   — Peña Cantero & Vervoort, 1999: 368 –371, fig. 3.

Material examined. 54907#3, four stems up to 18 mm high, on coral, with gonothecae.

Description. Stems polysiphonic, up to 18 mm high. Stem with alternately arranged cauline apophyses giving rise to hydrocladia ( Fig. 8F View FIGURE 8 ). Stem divided into internodes with one to two cauline hydrothecae. Each at axil between cauline apophysis and internode and with three associated nematothecae ( Fig. 8A–B View FIGURE 8 ): two flanking hydrothecal aperture and one under the hydrotheca. Cauline apophyses with one basal nematotheca ( Fig. 8B View FIGURE 8 ). Hydrocladia unbranched, heteromerously divided into internodes with one or two hydrothecae. Each hydrocladial hydrotheca with three associated nematothecae ( Fig. 8C–D View FIGURE 8 ): two flanking hydrothecal aperture and one infrathecal nematotheca. Hydrotheca elongate ( Fig. 8E View FIGURE 8 ), length slightly increasing along hydrocladia (e.g. abcauline length from 230 to 290 µm).

Gonothecae inserted on cauline and hydrocladial internodes through a small pedicel ( Fig. 8E–F View FIGURE 8 ); up to two gonothecae per internode ( Fig. 8E View FIGURE 8 ). Gonotheca inverted pear-shaped ( Fig. 8F View FIGURE 8 ), with circular diaphragm at basal fifth delimiting a basal chamber. Two nematothecae inserted at diaphragm. Gonothecal aperture wide, subterminal and adcaudally directed. Gonotheca 400 µm high and 240 µm in maximum diameter.

Remarks. Schizotricha profunda   is the only species of the genus with unforked hydrocladia. These are typically branched once or several times in the remaining species of Schizotricha   . Peña Cantero and Vervoort (1999: 369), who re-described the species after examining the type material, discussed the differences with the morphologically closest species of the genus.

Ecology and distribution. This is a bathyal species ( Peña Cantero & Vervoort 1999), previously reported from 491 to 792 m depth ( Nutting 1900); present material collected at 1060 m, distinctly increasing its lower bathymetric limit, on coral, and with gonothecae in May.

Hitherto , only known off the east coast of Florida (30°44’N 79°26’W and 30°53’N 79°42’30’’W) ( Nutting 1900). Our material, which represents the second record for the species, comes from the Porcupine Seabight. GoogleMaps  

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Halopterididae

Genus

Schizotricha

Loc

Schizotricha profunda ( Nutting, 1900 )

Peña Cantero, Álvaro L. & Horton, Tammy 2017
2017
Loc

Polyplumaria profunda

Pena 1999: 368
Broch 1918: 60
1918
Loc

Plumularia profunda

Nutting 1900: 66
1900