Late Neogene Lophophaenidae (Nassellaria, Radiolaria) from the eastern equatorial Pacific
Author
Trubovitz, Sarah
Author
Renaudie, Johan
Author
Lazarus, David
Author
Noble, Paula
text
Zootaxa
2022
2022-07-04
5160
1
1
158
http://dx.doi.org/10.11646/zootaxa.5160.1.1
journal article
10.11646/zootaxa.5160.1.1
11755334
10544058
A9179C79-EE43-44E4-8723-919505500049
Pelagomanes ibburi
n. sp.
Plate 41,
Figs. 1A
–
6B
.
urn:lsid:zoobank.org:act:
3F89A23A-6C54-4E59-8FA0-71B62A21F316
Lithomelissa kozoi
cf sp 1,
Trubovitz
et al.
2020
, supplementary data 7.
Diagnosis.
Pelagomanes
with a cephalis that ranges from having few, small pores to being entirely hyaline, has a relatively weak hooklike apical horn, and an elongated thorax with very strong shoulders at the top and three feet in addition to small teeth at the base.
Description.
The cephalis of this species has small pores and is often hyaline (i.e., figs. 1 and 2). The apical horn extends from the dorsal side of the cephalis before reaching the apex, and is slightly curved at its base. The thorax is approximately twice the length of the cephalis, and slightly wider than it. Pores on the thorax get larger toward the base, and have the tendency to become more elongated in shape. Prominent shoulders exhibit at the top of the thorax, and the furrows between them extend downwards as ribs along the thorax and finally as bladed feet at the base of the skeleton. The base of the thorax may be enclosed in some specimens (i.e., fig. 3), and fully-preserved individuals show small teeth at the base of the thorax between the three feet.
Remarks.
This species differs from
Pelagomanes kozoi
Renaudie and Lazarus, 2013a
(Pl. 39,
Figs. 1–6
) in that the shoulders are usually stronger, and the teeth at the base of the thorax are shorter and have more contrast with the three feet. In addition, the thorax of this species tends to be longer than in
P. kozoi
, and the cephalis is often more hyaline. This species differs from
Pseudodictyophimus gracilipes
in that the thorax is narrower and more elongated. The apical and ventral horns show variable development, but are never as strong as those of
P. thaumasia
(Pl. 39,
Figs. 10A
–11),
P. morawanensis
(Pl. 40,
Figs. 4A
–
6
,
9
, 11–12), or
P. tekopua
(Pl. 40,
Fig. 13
).
Material examined.
78 specimens observed from samples 321-1337A-35X-1, 106–108cm (Middle Miocene), 321-1337A-31X-6, 4–6cm (Middle Miocene), 321-1337D-30H-3, 103–104cm (Middle Miocene), 321-1337D-26H-
3, 142–144cm
(Late Miocene), 321-1337D-23H-
6, 134–137cm
(Late Miocene), 321-1337A-18H-6,
77–80cm
(Late Miocene), 321-1337A-16H-
6, 121–124cm
(Late Miocene), 321-1337A-14H-7,
39–42cm
(Late Miocene), 321-1337A-12H-5,
23–26cm
(Late Miocene), 321-1337A-10H-2,
91–94cm
(Early Pliocene), 321-1337A-7H-
6, 104–107cm
(Early Pliocene), 321-1337A-6H-3,
29–32cm
(Late Pliocene), 321-1337A-4H-
6, 115–118cm
(Early Pleistocene), 321-1337A-4H-2,
16–19cm
(Middle Pleistocene), 321-1337A-3H-
2, 103–106cm
(Middle Pleistocene), 321-1337A-2H-3,
76–79cm
(Late Pleistocene), and 321-1337D-1H-1,
0–3cm
(Recent).
Holotype
.
Pl. 41,
Figs. 2A–B
; sample
321-1337A-16H-
6, 121–
124cm
; ECO-141; Z12-4.
Paratypes
.
(1) Pl. 41, figs. 1A–B; sample
321-1337A-16H-
6, 121–124cm
; ECO-143; K12-3. (2) Pl. 41, figs. 4A–B; sample
321-1337D-23H-
6, 134–137cm
; ECO-145; N15-1. (3) Pl. 41, figs. 3A–B; sample
321-1337D-23H-
6, 134–137cm
; ECO-145; G17-2. (4) Pl. 41, figs. 6A–B; sample
321-1337A-14H-7
,
39–42cm
; ECO-138;
V9-2.
(5) Pl. 41, figs. 5A–B; sample
321-1337A-16H-
6, 121–124cm
; ECO-143; J18-2
.
Measurements.
Cephalis height 30–37 (34)μm, cephalis width 26–31 (29)μm, thorax length (not including feet) 45–59 (49)μm, width at shoulders 38–47 (42)μm. Based on
8 specimens
.
Etymology.
Named for ibbur in
Jewish
folklore, a
type
of benevolent spirit possession intended to help people succeed.
Range.
Middle Miocene—Recent, EEP (
Table 1
).