Neolepidotrochus parvidiscus angolensis Bohn, 2005

Bohn, Jens Michael, 2006, Crinoidea and Holothuroidea (Echinodermata) of the abyssal Angola Basin — Results of the DIVA­ 1 expedition of FS " Meteor " (Cruise M 48 / 1), Zootaxa 1276, pp. 1-31 : 24-25

Neolepidotrochus parvidiscus angolensis Bohn, 2005

( Figs 13 B–C, 14)

Neolepidotrochus parvidiscus angolensis Bohn, 2005: 234 –237, figs 1(C–G), 3, 4

Material. M 48/1­340: Holotype ( ZSM 20020017).

Remarks. This subspecies has been recently described in more detail ( Bohn 2005) and is characterised by: body wall and tentacle bases with two types of wheel deposits, neolepidotrochid type wheels ( Fig. 13 B) and myriotrochid type wheels ( Fig. 13 C). Neolepidotrochid type wheels with variable number (up to 16) of outward­pointing secondary teeth ( Fig. 12 B: arrowheads), not present in all wheels, but in the majority; edge of rim between two outward­pointing primary teeth roughly straight; neolepidotrochid type wheels from anterior body smaller (mean diameter: 111, range: 95–129), than wheels from posterior body (mean diameter: 140, range: 127–158) and with higher ratio of hub diameter to wheel diameter (mean: 40 %, range: 30–47 %) compared to wheels from posterior body (mean: 29 %, range: 22–36 %). Myriotrochid type wheels have a diameter of 130 (75–166), ratio of hub diameter to wheel diameter 21 % (18–26 %), spokes 10 (8–14).

Distribution. ( Fig. 14 ) Angola Basin in the south­eastern Atlantic Ocean, 5395 m.

Species Atlantic Indian Pacific Southern Ocean Ocean Ocean Ocean

N S N S N S

Bathycrinus aldrichianus Wyville Thomson, 1876 + +

Porphyrocrinus incrassatus ( Gislén, 1933) + +

Deima validum validum Théel, 1879 + + + + + +

Psychropotes depressa ( Théel, 1882) + + + +

Psychropotes longicauda Théel, 1882 + + + + + +

Psychropotes semperiana Théel, 1882 + + + +

Peniagone diaphana ( Théel, 1882) + + + + +

Peniagone purpurea ( Théel, 1882) + + + + +

Achlyonice ecalcarea Théel, 1879 + + + + +

Molpadiodemas atlanticus ( R. Perrier, 1898) + + + +

Molpadiodemas depressus ( Hérouard, 1902) + +

Molpadiodemas involutus ( Sluiter, 1901) + + + + +

Molpadiodemas villosus (Théel, 1886) + + + + + +

Mesothuria candelabra Hérouard, 1923 + +

Paelopatides grisea R. Perrier, 1898 + +

Paroriza pallens (Koehler, 1896) + +

Molpadia musculus Risso, 1826 + + + + + + +

Molpadia blakei (Théel, 1886) + +

Molpadia liska Pawson, 1977 + + +

Protankyra brychia ( Verrill, 1885) + + + +

Siniotrochus myriodontus Gage & Billett, 1986 + +

Figures

FIGURE 12. Distribution of Protankyra brychia (Verrill, 1885).

FIGURE 13. (A) Siniotrochus myriodontus Gage & Billett, 1986. Wheel deposit of body wall. (B – C) Neolepidotrochus parvidiscus angolensis Bohn, 2005. Wheel deposits of body wall. (B) Neolepidotrochid type wheel. (C) Myriotrochid type wheel. Arrowheads – outward­pointing secondary teeth.

FIGURE 14. Distribution of Siniotrochus myriodontus Gage & Billett, 1986 and Neolepidotrochus parvidiscus angolensis Bohn, 2005.