Orbiniella Day, 1954

Parapar, Julio, Moreira, Juan & Helgason, Gudmundur Vidir, 2015, First record of genus Orbiniella Day, 1954 (Polychaeta: Orbiniidae) in North Atlantic Ocean with the description of a new species, Zootaxa 4006 (2), pp. 330-346 : 333

publication ID

https://doi.org/ 10.11646/zootaxa.4006.2.5

publication LSID

lsid:zoobank.org:pub:C6FF2AFA-3BD7-4B22-BE72-C48984714099

DOI

https://doi.org/10.5281/zenodo.5661908

persistent identifier

https://treatment.plazi.org/id/C268879D-FF84-7232-E0AA-ECBEFCADE639

treatment provided by

Plazi

scientific name

Orbiniella Day, 1954
status

 

Genus Orbiniella Day, 1954 View in CoL

Type species. Orbiniella minuta Day, 1954

Orbiniella Day, 1954: 22 View in CoL , Fig. 3 View FIGURE 3 G–K.

Falklandiella View in CoL .— Hartman 1967: 109, Fig. 35.

Orbiniella View in CoL .— Fauchald 1977: 16; Solís-Weiss & Fauchald 1989: 781; Buzhinskaja 1993: 77, Figs. 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 ; Gillet 1999: 592, Figs. 1–2 View FIGURE 1 View FIGURE 2 .

Diagnosis. Body not divided into thorax and abdomen, prostomium rounded. Eyes present or absent. Two peristomial annuli. Chaetigerous segments without branchiae or parapodial lobes; chaetae including crenulated capillaries and simple acicular spines. Noto- and neuropodial capillaries either smooth, with two rows of wide teeth along the margins, or with transverse rows of short spines. Teeth sometimes bearing long hairs at distal tips. Short and thick acicular spines (smooth or barbed) maybe present in both parapodial rami or only in neuropodia. Pygidium with two or four lobes, with or without cirri.

Remarks. Originally, Day (1954) did not provide a diagnosis of the genus Orbiniella , which is later provided by Fauchald (1977) and more recently by Solís-Weiss & Fauchald (1989), Buzhinskaja (1993) and Gillet (1999). The diagnosis followed here is that proposed by Buzhinskaja (1993), which has been slightly modified to avoid ambiguous terms such as “first two segments”; those refer to the two achaetous anterior rings. Furthermore, we consider that the pygidium may be either bilobed (as referred for previously described species) or four-lobed (the new species described herein).

There has also been confusion over the location of the peristomium and first segment in the Orbiniidae in general ( Rouse 2002) and in Orbiniella in particular. Thus, genera of the Microrbiniinae Blake, 2000 have two annuli between the prostomium and the first chaetiger. Some authors consider that one of them is an “achaetous segment” ( Day 1977; Fauchald 1977; Solís-Weiss & Fauchald 1989); alternatively, the peristomium would be constituted by two rings ( Blake 1996). We consider that the latter would be more plausible; however, using the number of peristomial rings for separating genera or species may be not a reliable character ( Blake 2000). Furthermore, the division of body into thorax and abdomen through transitional segments and presence of furcate chaetae does not seem appropriate to characterize the genus Orbiniella ( Buzhinskaja 1993) and therefore O. drakei should not be included in this genus. Likewise, the presence of branchiae in O. branchiata suggests that this species should be referred to other genus ( Blake 2000). Buzhinskaja (1993) also suggests that Falklandiella annulata should be transferred to Orbiniella , according to the original description and drawings by Hartman (1967). Blake (2000) considers it as valid although Fauchald (1977) places this genus as incertidae sedis but still recognising that resembles the orbiniids in chaetal features.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Family

Orbiniidae

Loc

Orbiniella Day, 1954

Parapar, Julio, Moreira, Juan & Helgason, Gudmundur Vidir 2015
2015
Loc

Orbiniella

Gillet 1999: 592
Buzhinskaja 1993: 77
Solis-Weiss 1989: 781
Fauchald 1977: 16
1977
Loc

Falklandiella

Hartman 1967: 109
1967
Loc

Orbiniella

Day 1954: 22
1954
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