Bathymarginaster patriciae ( McKnight, 2006 )
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publication ID |
https://doi.org/ 10.24199/j.mmv.2023.82.06 |
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publication LSID |
urn:lsid:zoobank.org:pub:B48A3062-C822-4DD1-ADCC-A577C9D2CD32 |
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persistent identifier |
https://treatment.plazi.org/id/03E33A5A-FFE5-1365-FF42-FCE4FEC5F8D7 |
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treatment provided by |
Felipe |
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scientific name |
Bathymarginaster patriciae ( McKnight, 2006 ) |
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Bathymarginaster patriciae ( McKnight, 2006) View in CoL nov. gen, nov. comb.
Figure 1a–f View Figure 1
Diagnosis. Body weakly stellate to stellate (R/r=1.6–2.1) ( Fig. 1a View Figure 1 ). Body surface, including abactinal, marginal, actinal surface all covered by dermis. Abactinal surface reticulate to imbricate, with coarse granulation/spination on each plate ( Fig. 1a, b View Figure 1 ), single papulae present. Marginal plates lateral facing, approximately 16 per interradius ( Fig. 1c View Figure 1 ), each plate bearing an upper and lower series, each with 2–3 spinelets present, the lower series approximately 2–3 times as large as the upper and present around the actinolateral fringe. Distinct actinolateral edge ( Fig. 1e View Figure 1 ) formed by the inferomarginal plates and the actinal surface. Actinal intermediate region with approximately 16 segments, each with a spine forming a transverse series across each interradius ( Fig. 1f View Figure 1 ). Furrow spines, two covered in dermis ( Fig. 1d, f View Figure 1 ); no other adambulacral spination evident.
Comments. Examination of M. patriciae specimens relative to other Marginaster species, including the holotype of Marginaster paucispinus , led to the conclusion that M. patriciae is significantly different from other species assigned to Marginaster . ‘ Marginaster’ patriciae shows a much more stellate body shape, has a much denser and heavier abactinal skeleton that is weakly fenestrate. This contrasts with the skeleton in more typological Marginaster species, which show a more openly arranged mesh with a variably developed dermal covering ( Fig. 2). Marginaster patriciae has laterally oriented marginal plates that form a distinct ventrolateral edge with the actinal surface, whereas the marginals, especially the inferomarginal plates, of other Marginaster species are extended from the superomarginals to form a distinct flattened lateral “ledge” or platform with spines.
Marginaster patriciae was originally described from New Zealand waters from near Chatham Rise at 900–1130 m.
Among poraniids, Bathymarginaster nov. gen. is perhaps closest to Poraniomorpha , which shows a fenestrate skeleton. The abactinal skeleton of the former shows a skeleton with a granular/spinose covering, rather than the more open reticulate skeleton observed in true Marginaster species (e.g. Fig. 2a–d). Bathymarginaster displays a much heavier dermal overlay ( Fig. 1b View Figure 1 ) than Poraniomorpha that obscures the marginal and actinal plate boundaries in the former. Bathyporania similarly displays a granular overlay but possesses a more open, reticulate skeleton.
Occurrence. Chatham Rise, central New Zealand, 900–1130 m. Note that McKnight (2006: 107) confused the depth range of M. patriciae with that of M. paucispinus (518–554 m).
Australian waters. J1 Seamount near Tasmania, Great Australian Bight. 850–1650 m.
Description. Body thick, strongly arched weakly stellate to stellate (R/r=1.6–2.1), arms triangular in shape, cylindrical to triangular in cross-section, actinal surface flat with distinct actinolateral edge. Plates, spines, accessories all covered by dermis ( Fig. 1a, b View Figure 1 ). Arm tips upturned.
Abactinal surface fenestrate to imbricate, skeletal plates individually wide, fully enclosed over disk but forming wider, open spaces distally on arms. Individual plates ranging from larger, more irregular in shape proximally, becoming more crescentic along arms. Each plate with short, blunt spines or granules (4–15, but mostly 7–10), widely spaced, number decreasing distally along arm ( Fig. 1b View Figure 1 ). Single papular pores present irregularly scattered on arms and disk on abactinal and lateral surfaces. Madreporite round, flat, adjacent to abactinal plates and slightly overlaid with tissue around edges.
Marginal plate boundaries largely obscured by dermis, but approximately 16 per interradius, eight per arm side at R=1.0 cm ( Fig. 1c, e View Figure 1 ). At arm tip dermis sufficiently translucent as to reveal elongate plates, edges rounded, decreasing in width adjacent to arm terminus.
Superomarginal and inferomarginal plates each with spines (tips conical and pointed) in upper and lower series, approximately 2–3 in each row. Inferomarginal spines approximately twice as large as those on the superomarginal series, especially those spines on the lower series adjacent to the contact with the actinal plates. Terminal plate quadrate with a circular edge, bearing two small spines.
Actinal plates covered by dermis that shows distinct channels ( Fig. 1d, f View Figure 1 ), forming segments that track from the abactinal-lateral surface via the marginal plates to the underside of the actinal surface around the marginals to each adambulacral plate ( Fig. 3e View Figure 3 ). Actinal surface smooth, dermal tissue continuous from marginal plates. Each actinal intermediate segment has approximately 16 dermis-covered cone-like spines. These are single proximally, becoming double adjacent to the spines on the inferomarginal plates. These spines are in three lateral series across the actinal intermediate region.
Two furrow spines ( Fig. 1d, f View Figure 1 ), covered by dermis in transverse series. No subambulacrals or other accessory adambulacral structures. Oral plate with two furrow spines, a single prominent spine projecting into mouth ( Fig. 1f View Figure 1 ).
Material examined. NMV F84961 View Materials 84 km SSE of South East Cape, J1 Seamount , Tasmania. - 44.27° S, 147.33° E, 1300–1450 m, Coll GoogleMaps . T. Stranks et al . CSIRO, 27 Jan 1997. 1 wet spec . R=1.3, r=0.6.
NMV F159299 View Materials Hill U. top west, Tasmania, Australia. - 44.3257° S, 147.175° E, 1100–1160 m. Coll GoogleMaps . CMBAR SS02 , April 2 2007 . 3 wet specs. R=1.3, r=0.7; R=1.0, r=0.5; R=1.4, r=0.6.
NMV F159300 View Materials Pedra West , south of Tasmania, - 44.2585° S, 147.092° E, 850–1000 m, Coll. O’Hara et al GoogleMaps , CMAR, 2 April 2007, 1 wet specs . R=1.3, r=0.8.
NMV F159301 View Materials Mini Matt SSW, Australia.- 44.2447°S, 146.164° E, 1120–1136 m. Coll. O’Hara et al, 4 April 2007 GoogleMaps , CMAR SS02 . 3 wet specs. R=1.1, r=0.6; R=1.2, r=0.7; R=1.2, r=0.6.
NMV F159302 View Materials Mini Matt site, S. of Tasmania, - 44.2439° S, 146.165° E, 1120–1310 m, Coll. O’Hara et al GoogleMaps , CMAR 4 April , 2007, 2 wet specs . R=1.1, r=0.6; R=1.3, r=0.7.
NMV F159303 View Materials Pedra West, - 44.1322° S, 146.144° E, 1140– 1180 m, Coll. O’Hara et al GoogleMaps . CMAR 5 April 2007, 1 wet spec . R=0.9, r=0.5.
NMV F240386 View Materials , Great Australian Bight - 33.3366° S, 130.257° E, 188–191 m, Coll. IN 2015_C02 GAB BP Expedition – Ichthyology Team, IN 2015_C02 GAB BP Expedition – Marine Invertebrates Team, 15 Dec 2015. 1 wet spec GoogleMaps . R=0.6, r=0.4.
NMV F240376 View Materials , 82.6 km SSE of South East Cape, J1 Seamount , Tasmania, - 44.24° S, 147.36° E, 1200–1450 m, Coll GoogleMaps . T. Stranks et al . CSIRO, 27 Jan 1997 . 4 wet specs. R=1.1, r=0.6; R=1.2, r=0.7; R=1.1, r=0.6; R=1.1, r=0.6.
NMV F 241095 View Materials , 85.8 km SSE of South East Cape,“B1” seamount, -4431° S, 147.27° E, 1150–1550 m, Coll . T. Stranks et al . CSIRO, 28 Jan 1997 . 3 wet specs. R=1.2 r=0.5 R=1.1 r=0.5 R=0.9 r=0.6.
NMV F241096 View Materials , 87.8 km SSE of South East Cape, “A1” seamount, - 44.33° S, 147.27° E, 1200–1300 m, Coll GoogleMaps . T. Stranks et al . CSIRO, 30 Jan 1997, 1 wet spec . R=1.1 r=0.5.
NMV F241097 View Materials , 94.5 km SSE of South East Cape , “ V ” Seamount, - 44.4° S, 147.15° E, 1400–1650 m, Coll GoogleMaps . T. Stranks et al . CSIRO, 31 Jan 1997. 1 wet spec . R=1.0 r=0.6
NMV F241098 View Materials , K1 View Materials seamount, 89.5 km SSE of South East Cape , Tasmania, Australia, - 44.29° S, 147.41° E, 1225 m, Coll. Tim N. Stranks GoogleMaps , CSIRO aboard RV Southern Surveyor , 25 Jan 1997. 4 wet specs . R=1.0, r=0.7; R=1.0, r=0.5; R=0.9, r=0.4; R=0.7, r=0.3.
NMV F241099 View Materials , 81.6 km SSE of South East Cape, “38” seamount, Tasmania. - 44.23° S, 147.38° E, 1200–1400 m, Coll GoogleMaps . T. Stranks et al . CSIRO 30 Jan 1997, 1 wet spec . R=1.2, r=0.6.
NMV F241100 View Materials “ Sister 1” seamount, 82.9 km SSE of South East Cape, - 44.27° S, 147.29° E, 1100–1122 m, Coll GoogleMaps . T. Stranks et al . CSIRO, 23 Jan 1997 , 2 wet specs. R=1.1, r=0.5; R=1.0, r=0.6.
NMV F241101 View Materials “ Sister 1” seamount, 82.9 km SSE of South East Cape, - 44.27° S, 147.29° E, 1100–1122 m, Coll GoogleMaps . T. Stranks et al . CSIRO, 1 wet spec. R=1.0, r=0.4
NMV F241102 View Materials Mongrel seamount, Tasmania. - 44.2554° S, 147.114° E, 898 m. Coll GoogleMaps . R. Thrasher and D. Staples, 23 Dec 2008. 1 wet spec . R=1.0, r=0.5.
NMV F241103 View Materials Mongrel seamount, Tasmania. - 44.2554° S, 147.114° E, 899 m. Coll GoogleMaps . R. Thrasher and D. Staples, 13 Oct 2008. 1 wet spec . R=0.4 r=0.2.
NMV F241573 View Materials Patience seamount, Huon Commonwealth Marine Reserve, Tasmania, Australia, - 44.1206° S, 147.377° E, 1087 m, Coll. D. Bray GoogleMaps , RV Investigator 12 April 2015. 2 wet specs . R=1.0, r=0.3; R=1.2, r=0.4.
NMV F270826 View Materials Punch’s Hill, Tasmanian seamounts, Tasmania, - 44.185556° S, 147.188333° E, 919–1085 m. Coll. A. Williams, A.A. Weber and R-L. Erickson, 13 Dec 2018. 2 wet specs GoogleMaps . R=0.9, r=0.6; R=0.9, r=0.4.
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