Zoroaster stet. CCZ_065
publication ID |
https://dx.doi.org/10.3897/zookeys.1113.82172 |
persistent identifier |
https://treatment.plazi.org/id/B306AD78-526D-5D6F-912E-2D5CAD3DDF6A |
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scientific name |
Zoroaster stet. CCZ_065 |
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Fig. 27 View Figure 27
Material.
Clarion-Clipperton Zone • 1 specimen; APEI 7; 4.8877°N, 141.7569°W; 3132 m deep; 27 May. 2018; Smith & Durden leg.; GenBank: ON400691 View Materials (COI), ON406607 View Materials (16S); NHMUK 2022.78; Voucher code: CCZ_065 GoogleMaps .
Description.
Single specimen (R = 16.6 cm, r = 1.3 cm). Actinal and abactinal surfaces are bright orange when alive, with ambulacrum slightly darker orange (Fig. 27A-D View Figure 27 ). Small disc; with five long, slender arms, gradually tapering distally (Fig. 27B View Figure 27 ). Carinal plates bear conical primary spines, forming a single longitudinal row that runs along the arm (Fig. 27A, C View Figure 27 ).
Remarks.
Morphological characters are concordant with the description of the genus Zoroaster . The phylogenetic analyses also recovered the specimen in a well-supported clade with other species of the genus (Fig. 24 View Figure 24 ). However, COI divergence between species in the genus is very low (K2P distance ≈ 1-2%) and species-level clades were not recovered in the phylogeny, preventing us from assigning it to any species based on COI sequences. The closest match to the COI sequence of the CCZ specimen is a sequence from the long-armed morphotype (K2P distance 0.6%, GenBank accession number AY225785.1) identified for Z. fulgens Wyville Thomson, 1873 in the Porcupine Seabight, Atlantic Ocean (50.1987°N, 14.6593°W; 4001 m depth; Howell et al. 2004). Although this value is concordant with intraspecific divergence in the genus, the 16S sequences divergence between the CCZ specimen and the long-armed morphotype (K2P 1.1%) is larger than between the long-armed morphotype and Z. spinulosus Fisher, 1906 (K2P 0.0%) and between Z. spinulosus and Z. ophiactis Fisher, 1916 (K2P 0.3%).
Ecology.
The specimen was found partially buried in the sediment on the seamount on APEI 7 at 3133 m depth.
Comparison with image-based catalogue.
No similar Zoroasteridae morphotypes have been catalogued so far from seabed imagery in the eastern CCZ nor in abyssal areas of the Kiribati EEZ. Consequently, the in situ image of Zoroaster stet. CCZ_065 was catalogued as a new morphotype (i.e., Zoroaster sp. indet., AST_025).
Class Crinoidea
To date, there are 66 records of crinoids occurring deeper than 3000 m in the CCZ, with only seven of these representing preserved specimens ( OBIS 2022). Three specimens, belonging to two species, were collected in the western CCZ. The barcoding gene COI was amplified for all specimens, and sequences were included in a concatenated alignment (16S, 18S, 28S, COI, and CytB) used to estimate a phylogenetic tree for the class (Fig. 28 View Figure 28 ).
Subclass Articulata Zittel, 1879
Order Comatulida
Suborder Bourgueticrinina Sieverts-Doreck, 1953
Family Phrynocrinidae AH Clark, 1907
Subfamily Porphyrocrininae AM Clark, 1973
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