Protoariciella, Hartmann-Schroder, 1962

Zhadan, Anna, 2020, Review of Orbiniidae (Annelida, Sedentaria) from Australia, Zootaxa 4860 (4), pp. 451-502 : 498

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.4414248

persistent identifier

https://treatment.plazi.org/id/03A787FE-3B7F-0840-ABBF-FF04FC924305

treatment provided by

Plazi

scientific name

Protoariciella
status

 

Protoariciella View in CoL (?) sp. A

Figure 28 View FIGURE 28

Material examined. Queensland: Lizard Island, off Chinamans Head , 14°40’S, 145°27’E, depth 7 m, 28.07.1977, coll. P.A. Hutchings, AM W.43256, 1 specimen on SEM stub GoogleMaps .

Description. Specimen incomplete posteriorly, in poor condition. Body length about 5 mm, 42 chaetigers, width 170 µm ( Fig. 28A, B, G View FIGURE 28 ). Transition from thorax to abdomen indistinct ( Fig. 28A, G View FIGURE 28 ). Prostomium short, round, without eyes; two indistinctly separated peristomial segments ( Fig. 28B, C View FIGURE 28 ). Large ventral bulb ( Fig. 28C, G View FIGURE 28 ). Branchiae absent at least on six anterior chaetigers, present at least on some middle segments; cirriform, same length with notopodia ( Fig. 28E View FIGURE 28 ). Notopodial postchaetal lobes digitiform; neuropodial lobes reduced ( Fig. 28B, D, E View FIGURE 28 ). Notochaetae short and long crenulated capillaries in anterior segments, long capillaries only in posterior notopodia ( Fig. 28D, E, H, I View FIGURE 28 ); forked chaetae absent. Neurochaetae capillaries in thorax, crenulated and smooth capillaries and one curved serrated hook in abdomen ( Fig. 28 View FIGURE 28 C–E, F, I).

Remarks. The specimen studied here differ greatly from other Protoariciella specimens owing to the absence of uncini in the thoracic neuropodia, absence of forked chaetae, and single serrated hook in the abdominal neu- ropodia. This possibly represents a new genus, but the poor condition of the single specimen does not allow the establishment of a genus with certainty. The chaetal pattern is similar to that of Paraorbiniella paucibranchiata Rullier, 1974 , described from Cuba. However, this species only has a few pairs of branchiae in the anterior segments, whereas our specimen has branchiae in some abdominal segments. The specimen studied here likely represents a new species; but due to the few poorly preserved specimens and the limited knowledge of the important taxonomic characters in this genus, it is not described as a new species.

AM

Australian Museum

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Family

Orbiniidae

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