Loandalia gladstonensis, Marks, Shona & Hocknull, Scott, 2006

Marks, Shona & Hocknull, Scott, 2006, New species of Loandalia (Polychaeta: Pilargidae) from Queensland, Australia, Zootaxa 1119, pp. 59-68: 65-66

publication ID

http://doi.org/ 10.5281/zenodo.171680

publication LSID

lsid:zoobank.org:pub:DB1CEA92-5D73-43B7-A5C1-4BCF32B32451

persistent identifier

http://treatment.plazi.org/id/305287F5-FF85-FFD5-FED6-FA27FDFB7649

treatment provided by

Plazi

scientific name

Loandalia gladstonensis
status

sp. nov.

Loandalia gladstonensis  sp. nov.

Fig 3View FIGURE 3, a –d.

Etymology:

Gladstone Harbour, type locality.

Type Material:

Holotype. QMC G 222948, Loandalia gladstonensis  sp. nov. [Gladstone Harbour; station GH 144, S 23 ° 57 ’ 976 ”, E 151 ° 20 ’ 908 ”; depth 0–5m]. Paratypes. QMC G 222949, [Gladstone Harbour; station GH 148, S 23 ° 50 ’ 894 ”, E 151 ° 13 ’ 811 ”; intertidal]. QMC G 222950, [Gladstone Harbour; station GH038, S 23 ° 47 ’ 162 ”, E 151 ° 13 ’ 276 ”; intertidal]. QMC G 222951, [Gladstone Harbour; station GH 140, S 23 ° 51 ’ 170 ”, E 151 ° 18 ’ 892 ”; depth 0–5m]. QMC G 222952, [Gladstone Harbour; station GH016, S 23 ° 44 ’ 431 ”, E 151 °08’ 132 ”; intertidal]. QMC G 222953, [Gladstone Harbour, station GH014; S 23 ° 43 ’ 562 ”, E 151 ° 13 ’ 276 ”; depth 0–5m]. Habitat is intertidal or at depths of 0–5m, usually with sand or muddy substrates.

Diagnosis:

Bifid palpostyles; chaetigers 1–5 inflated; pharynx with distal ring of papillae (2 groups of 5); chaetiger 1 uniramous with remaining chaetigers biramous; single notochaeta present; straight emergent spine from chaetiger 7–8; ventral cirri present from chaetiger 5; 5–6 neurochaetae; posterior most segment possesses emergent notopodial spines and neuroacicula, with reduced parapodial lobes.

Description:

Pilargids of small size, length 30–62mm, with 79–114 chaetigers. Body of preserved individuals creamy/white to reddish/brown. Body slender with chaetiger 1–5 inflated; segmentation inconspicuous. Posterior segments slightly dorso­ventrally flattened. Prostomium discrete; palpophores divided; palpostyles papilla­like and bifid. Pharynx eversible with distal ring of 10 papillae, 5 dorsal and 5 ventral to pharyngeal slit; papillose band on pharynx, proximal to prostomium; pharyngeal slit vertical. Eye spots present, subdermal at chaetiger 1 ( Fig 3View FIGURE 3, a). First parapodium uniramous with remaining chaetigers biramous; first neuropodia positioned dorsally compared to remaining chaetigers. Notopodial lobes fully developed by chaetiger 4; a single notochaetae present from chaetiger 2; notopodial spines emerging at chaetiger 7–8, increasing in length in posterior most 10 segments. Neuropodial lobe larger than notopodia, reduced in chaetiger 1–2; neurochaetae capillaries with numerous whorled teeth; 5–6 neurochaetae present per parapodia; emergent acicular from chaetiger 2. Ventral cirri from chaetiger 5 ( Fig 3View FIGURE 3, b). Posterior most segment possesses emergent notopodial spines and neuroacicula, with considerably reduced parapodial lobes. Pygidium as an anal plate, dorsally concave with dorsal terminating anus, positioned at base of concave plate; 3 anal cirri present, papillaelike, 2 laterally and 1 mid ventrally positioned ( Fig 3View FIGURE 3, c&d).

Remarks:

Loandalia gladstonensis  differs from all species of Loandalia  (except L. bennei  , L.

evelinae  and L. riojai  ) by possessing bifid palpostyles. L. bennei  , L. evelinae  and L. riojai  possess bifid palpostyles. L. gladstonensis  further differs from L. gracilis  and L. indica  by possessing uniramous parapodia. L. gladstonensis  differs from L. riojai  , L. indica  , L. ocularis  , L. fauveli  and L. americana  by possessing a higher number of pharyngeal papillae (10). L. gladstonensis  differs from L. evelinae  , L. bennei  and L. riojai  by possessing a large rounded plate as the pygidium with papillae­like anal cirri. L. gladstonensis  differs from L. evelinae  , L. ocularis  and L. vivianneae  by the presence of emergent spines and neuroacicula on the last segment. L. gladstonensis  differs from L. aberrans  by lacking dorsal cirri. L. salazarvallejoi  and L. fredrayorum  differ from L. gladstonensis  by possessing emergent notopodial spines starting at chaetiger 9 and 10 respectively; higher neurochaetae counts, 10–12 and 20–24 respectively. L. gladstonensis  differs from L. maculata  and L. tricuspis  by possessing ventral cirri starting at chaetiger 5, versus chaetiger 4 in L. tricuspis  and chaetiger 6 in L. maculata  . Distinguishing features summarised in table 1.