The sponge fauna of the Seno Magdalena and Puyuhuapi Fjord (Chile), with a description of two new species
Author
Bertolino, Marco
Author
Costa, Gabriele
Author
Reboa, Anna
Author
Bavestrello, Giorgio
Author
Pansini, Maurizio
Author
Betti, Federico
Author
Bo, Marzia
Author
Daneri, Giovanni
text
Zootaxa
2019
2019-06-25
4623
2
306
320
journal article
26411
10.11646/zootaxa.4623.2.5
cb8a3930-eb30-4697-a9f6-fc21d04f681e
1175-5326
3255473
7A20397D-A26E-4B7D-80DF-6B78AE999F6C
Genus
Hamigera
Gray, 1867
Emended diagnosis
:
Hymedesmiidae
without acanthostyles; with strongyles or tylotes as tornotes; with coring and echinating smooth styles or subtylostyles. The styles can also be polytylote with two size categories; arcuate chelae or cleistochelae.
Hamigera cleistochela
Bertolino
,
Costa
& Pansini
sp. nov.
(
Fig. 5
)
Type material.
Holotype
:
MSNG 60892
(
CILE
67),
Seno Magdalena F
(
44.631235°S
72.904239°W
), Puerto Cisnes (
Chile
),
25 m
depth
, on a rocky slope, 2014
Description.
Small, massive globose sponge (covering an area of about
5 cm
2
) (
Fig. 5A
). Surface regularly areolate with inhalant and exhalant parts clearly distinguishable from one another (
Fig. 5A
). The colour in life is ochre (
Fig. 5A
). Consistence is soft and compressible.
Skeleton
. Plumose skeleton with multispicular tracts of polytylote styles that form bouquets near the sponge surface. Microscleres scattered in the skeleton, but they are mainly concentrated in the sponge surface.
Spicules
. Megascleres: Two size categories of polytylote styles: (I), larger styles, straight with acerate tips, 440 (482.5) 580
x 5
(8.6)
10 µm
(
Fig. 5B
); (II), very thin, smaller polytylote styles, straight, 105 (188.2) 252.5
x 2
(2.3)
2.5 µm
(
Fig. 5C
). Microscleres: Cleistochelae with frontal teeth more or less fused together (
Fig. 5D
). Arcuate isochelae with short, inward teeth (
Fig. 5E
). Both measure 25 (30.1)
35 x 5
(5.3)
7.5 µm
.
Etymology.
The new species in named after its characteristic chelae (cleistochelae).
Ecology.
Our specimen was found on rocky walls at
25 m
depth.
Remarks.
The species is assigned to
Hamigera
Gray, 1867
due to the presence of an areolate surface, according to the structure skeleton and the absence of acanthostyles. Four species of the genus are known in total. None has polytylote styles and cleistochelae, therefore they are all different from the new species.
Hamigera hamigera
(Schmidt, 1862)
, collected in Mediterranean Sea down to
23 m
, has tornotes in the form of strongyles to tylotes (230–320
x
3–7
µm), styles to subtylostyles (240–320
x
5–9
µm), and arcuate isochelae (
15–22 µm
).
Hamigera macrostrongyla
Bergquist &Fromont, 1988
, from New Zaland, has styles (360–490
x
5–10
µm), strongyles (370– 460
x
7–10
µm), and arcuate isochelae (
49–56 µm
).
Hamigera strongylata
Burton, 1934
, from East
Australia
, has strongyles (280–400
x
8
µm) and isochelae (
30 µm
).
Hamigera tarangaensis
Bergquist & Fromont, 1988
, from
New Zealand
, has strongyles (210–440 x
3.5–7 µm
), and arcuate isochelae with short alae (
23–60 µm
).
Hamigera cleistochela
sp. nov.
, according to its unusual spicular set, with two size categories of polytylote styles, and chelae including cleistochelae, is here considered as new to science.