Review of Orbiniidae (Annelida, Sedentaria) from Australia
Author
Zhadan, Anna
text
Zootaxa
2020
2020-10-14
4860
4
451
502
journal article
8231
10.11646/zootaxa.4860.4.1
1f5ee6c2-2635-44a8-8469-49319b7a8c62
1175-5326
4414137
876F1085-5296-4340-A951-41420C011917
Orbinia papillosa
(
Ehlers, 1907
)
Figures 19
,
20
Aricia papillosa
Ehlers, 1907: 16
, figs.7–14.
Orbinia papillosa
:
Day 1977: 233
.
Material examined.
New Zealand
:
South Island
,
Christchurch
,
Heathcote Estuary
,
Banks Peninsula
,
43°32’S
,
172°42’E
,
22.10.1961
, coll.
I. Estcourt
,
AM
W.7459, 1 complete specimen
.
Type
locality.
Waiheke
,
Auckland
,
New Zealand
.
Description
. Thoracic width
2 mm
. Body long, thorax slightly flattened, abdomen cylindrical, thoracic chaetigers numbering 27 (
Fig. 19A
). Prostomium conical, short and wide, with sharply pointed tip (
Fig. 19C, D
). Branchiae from chaetiger 5, triangular with filiform tips; in abdomen becoming long, strap-like with tapering tips, longer than notopodia (
Figs 19C, D, G
,
20
A–C). Thoracic notopodial postchaetal lobes developed from first chaetiger, digitate, in abdomen becoming wider and lanceolate (
Figs 19C, D, G
,
20
A–C). Thoracic neuropodial postchaetal lobes as ridges with papillae: chaetigers 1–4 with one papilla, chaetigers 5–6 with 2 papillae, then their number increasing up to 10–12 podal papillae (
Figs 19D, E
,
20A
). Subpodal papillae from chaetiger 20 to 33; on chaetigers 22–29 extending ventrally to near mid-ventral line (
Fig. 19A, E, F
). Maximum number of foot and subpodal papillae combined per segment about 35. Abdominal neuropodia bilobed with outer lobe longer than inner lobe; subpodal flange well developed, with cirriform flange papillae (ventral cirrus) and scalloped margin (
Figs 19B, G, H
,
20B, C
). Interramal cirrus short, knob-like, not always well marked (
Figs 19G, H
,
20B, C
). Pygidium with two long thin anal cirri (
Fig. 19B
). Notopodial chaetae crenulate capillaries, in abdominal notopodia also forked chaetae present (
Fig. 20B
). Thoracic neuropodia bearing 3–4 rows of curved to almost straight smooth uncini and few thin capillaries in upper part of posterior row (
Figs 19D
,
20A
). Abdominal neuropodia with capillary and flail chaetae (
Fig. 20B
). Both rami supported by thin aciculae in abdomen (
Fig. 20B, C
).
FIGURE 19.
Orbinia papillosa
, AM W.
7459, stereomicroscope, methylene blue staining; A. General view; B. Posterior end with pygidium; C. Anterior end, dorsal view; D. Anterior end, lateral view; E. Thorax-abdomen transition, lateral view; F. Thorax-abdomen transition, ventral view; G. Abdomen, dorsal view; H. Abdomen, lateral view.
Distribution
.
Australia
,
Victoria
,
New Zealand
.
Habitat.
Intertidal, sand, seagrass.
Remarks.
Orbinia papillosa
was described from
New Zealand
(
Ehlers 1907
) and later recorded from Victoria by
Day (1977)
. The specimen studied here is in agreement with the original description. The short knob-like interramal cirrus is reported for the first time for this species.