Orbinia papillosa ( Ehlers, 1907 )

Zhadan, Anna, 2020, Review of Orbiniidae (Annelida, Sedentaria) from Australia, Zootaxa 4860 (4), pp. 451-502 : 485-487

publication ID

https://doi.org/10.11646/zootaxa.4860.4.1

publication LSID

lsid:zoobank.org:pub:876F1085-5296-4340-A951-41420C011917

DOI

https://doi.org/10.5281/zenodo.4414232

persistent identifier

https://treatment.plazi.org/id/03A787FE-3B72-0854-ABBF-FB61FCBA43E9

treatment provided by

Plazi

scientific name

Orbinia papillosa ( Ehlers, 1907 )
status

 

Orbinia papillosa ( Ehlers, 1907)

Figures 19 View FIGURE 19 , 20 View FIGURE 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 GoogleMaps .

Type locality. Waiheke , Auckland, New Zealand .

Description. Thoracic width 2 mm. Body long, thorax slightly flattened, abdomen cylindrical, thoracic chaetigers numbering 27 ( Fig. 19A View FIGURE 19 ). Prostomium conical, short and wide, with sharply pointed tip ( Fig. 19C, D View FIGURE 19 ). Branchiae from chaetiger 5, triangular with filiform tips; in abdomen becoming long, strap-like with tapering tips, longer than notopodia ( Figs 19C, D, G View FIGURE 19 , 20 View FIGURE 20 A–C). Thoracic notopodial postchaetal lobes developed from first chaetiger, digitate, in abdomen becoming wider and lanceolate ( Figs 19C, D, G View FIGURE 19 , 20 View FIGURE 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 View FIGURE 19 , 20A View FIGURE 20 ). Subpodal papillae from chaetiger 20 to 33; on chaetigers 22–29 extending ventrally to near mid-ventral line ( Fig. 19A, E, F View FIGURE 19 ). 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 View FIGURE 19 , 20B, C View FIGURE 20 ). Interramal cirrus short, knob-like, not always well marked ( Figs 19G, H View FIGURE 19 , 20B, C View FIGURE 20 ). Pygidium with two long thin anal cirri ( Fig. 19B View FIGURE 19 ). Notopodial chaetae crenulate capillaries, in abdominal notopodia also forked chaetae present ( Fig. 20B View FIGURE 20 ). 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 View FIGURE 19 , 20A View FIGURE 20 ). Abdominal neuropodia with capillary and flail chaetae ( Fig. 20B View FIGURE 20 ). Both rami supported by thin aciculae in abdomen ( Fig. 20B, C View FIGURE 20 ).

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.

AM

Australian Museum

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Family

Orbiniidae

Genus

Orbinia

Loc

Orbinia papillosa ( Ehlers, 1907 )

Zhadan, Anna 2020
2020
Loc

Orbinia papillosa:

Day, J. H. 1977: 233
1977
Loc

Aricia papillosa

Ehlers, E. 1907: 16
1907