, St. 10-07, 29.07 2015, Epibenthic sledge, 46 06.0 6 05.eight N, 152 14.four 52 14.6 E, 4769798 m, 13 specimens; RV Sonne, cruise
, St. 10-07, 29.07 2015, Epibenthic sledge, 46 06.0 6 05.eight N, 152 14.four 52 14.six E, 4769798 m, 13 specimens; RV Sonne, cruise 223 (KuramBio), St. 03-10, 05.08.2012, Agassiz Trawl, 47 14.27’7 14.94 N, 154 42.17 54 43.18 E, 4977986 m, 16 specimens (ID KB301, KB302); St. 11-10, 30.08.2012, Agassiz Trawl, 40 13.33 0 12.53 N, 148 06.48 48 05.76 E, 5348347 m, 1 specimen (ID KB1416); RV Sonne, cruise 250 (KuramBio II), St. 18, 22.08.2016, Agassiz Trawl, 45 50.861 5 51.954 N, 153 49.568 53 51.259 E, 8200185 m, 3 specimens (ID KB2_428); St. 31, 28.08.2016, Agassiz Trawl, 45 56.688 5 56.544 N, 152 52.785 52 54.667 E, 6184.5220.6 m, IORAS ECH02146ECH02148, ECH01808, ECH01812, ECH01813, 11 specimens; St. 86, 15.09.2016, Agassiz Trawl, 45 1.202′ N, 151 6.008′ E, 5572–5530 m, 6 specimens. Diagnosis. Body elongated, roughly 3 times as long as wide. Colour in alcohol grey. Tube feet up to 10 pairs, present in the anterior 1/3 to 1/4 of the physique, anteriormost five pairs absolutely free, other individuals forming posterior lobe. Velum broad and brief, formed by two pairs of papillae. Dorsal ossicles with strongly bent arms 0.1.3 mm lengthy; apophyses two, Etiocholanolone In stock seldom 1, 3 or 4, 0.09.two mm lengthy; apophyses and central stem thicker than arms. Ventral ossicles with arms 0.07.12 mm in length. Material description. Body length up to 75 mm (Figure 3A,B and Figure 4A,B). Ten tentacles. Anus dorsal. Skin rough owing to the dense layer of ossicles. Velum varying in size, based on contraction at preservation; velum didn’t cover the anterior end on the physique and tentacles in most preserved specimens, suggesting its comparatively compact size in live specimens. Cost-free ideas of papillae short in preserved state, 5 mm lengthy, lost in the majority of the specimens. Dorsal ossicles (Figure 2J and Figure 4C ) with strongly bent arms, in some cases GS-626510 Epigenetics practically vertical, 0.08.25 mm extended, hardly ever exceed 0.three mm; apophyses usually two, seldom 3 or four and sometimes 1 apophysis can be discovered, apophyses almost vertical, 0.09.two mm extended in most ossicles. Apophyses normally slightly shorter than arms, despite the fact that ossicles with much shorter apophyses also discovered (Figure 2L). Arms and apophyses spinous, on apophyses spines more conspicuous. In larger ossicles apophyses normally lengthy and straight situated close to each and every other. Ventrally flatten Peniagone-type ossicles, with arms 0.07.12 mm in length, spines conspicuous; brief spinous apophysis on each arm (Figures 2M and 4I ). Calcareous ring pieces with 90 pairs of arms, which could be subdivided. Polian vesicle single. Genetic information. See Table S1. Distribution. Frequent in the Kuril amchatka Trench region at abyssal and hadal depths, as well as identified within the Japan and Aleutian trenches (Figure 11). Depth variety 4200200 m. Remarks. Original description is depending on three broken specimens with upper layer of dorsal skin lacking, of which only two specimens are stay preserved. Djakonov [36] at first described this species devoid of describing any taxonomic characters considerable in the species level. Inside the later description [10], information of external morphology and ventral ossicles had been offered. The dorsal ossicles illustrated in the original description around the Figure 10 apparently happen within the deeper skin layer and cannot be utilised for species identification. Our examined specimens were assigned to P. mus according to one of a kind characteristics of ventral ossicles illustrated by Djakonov [10].Diversity 2021, 13,9 ofPeniagone mus differs from other species on the genus by the type of dorsal ossicles with two apophyse.
