Revision of the pentacrinid stalked crinoids of the genus Endoxocrinus (Echinodermata, Crinoidea), with a study of environmental control of characters and its consequences for taxonomy
Author
David, Jerome
Author
Roux, Michel
Author
Messing, Charles G.
Author
Ameziane, Nadia
text
Zootaxa
2006
1156
1
50
journal article
50584
10.5281/zenodo.172265
20ced0ab-42ec-4de6-bab0-b3da6529bae9
11755326
172265
Endoxocrinus
(
Diplocrinus
)
alternicirrus sibogae
(
Döderlein, 1907
)
Figures 13
c–d.
Synonym:
Isocrinus sibogae
Döderlein, 1907
: 18
;
Endoxocrinus sibogae
A. H. Clark, 1908b
: 152
;
Cenocrinus
(
Diplocrinus
)
sibogae
Döderlein, 1912
: 20
–21;
Diplocrinus sibogae
A.H. Clark, 1923
: 11
;
Diplocrinus
aff.
sibogae
Bourseau et
Roux, 1987
: 158
;
Diplocrinus
(
Diplocrinus
)
sibogae
Bourseau et al., 1991
: 259
;
Endoxocrinus
(
Diplocrinus
)
alternicirrus
var.
sibogae
David, 1998: 203
(unpublished data);
Endoxocrinus
(
Diplocrinus
)
sibogae
Roux et al., 2002
: 820
.
Emended diagnosis
A robust subspecies of
E.
(
D.
)
alternicirrus
with 26–64 arms (mode 40) up to
14.5 cm
long (mean
12 cm
); arm branching usually isotomous, proximal brachitaxes not contiguous and constricted at articulation 1+2; number of internodals per mature noditaxis 4–8 (mode 6); stalk length relatively short, up to
9.5 cm
(mean 7.0 cm); proximalmost diameter usually up to 8.0 mm, greater in the shallowest specimens (mean
6.5 mm
); nodals bearing 4–5 cirri, usually 5; length of cirrals
1.2–1.7 mm
(mean
1.5 mm
).
Type
Locality
Off Timor at a depth of
520 m
.
Holotype
: Catalogue no. 2066, Zoölogisch Museum, Amsterdam; first figured by
Döderlein 1907
, Pl. 9,
Fig. 1
and Pl. 12,
Fig. 12
.
Occurrence
Southwestern Pacific from eastern Tasmania and
Tonga
to the northern
Philippines
and Timor, at depths from
364 m
to
800 m
, rarely
970 m
(David 1998).