Lamprophaea aurita ( Hessle, 1925 ) Salazar-Vallejo, 2020
publication ID |
https://doi.org/ 10.11646/zootaxa.4739.1.1 |
publication LSID |
lsid:zoobank.org:pub:544B9C82-BF33-4EA1-9411-E1A307137466 |
DOI |
https://doi.org/10.5281/zenodo.3680281 |
persistent identifier |
https://treatment.plazi.org/id/2D1987E4-FFFF-7332-FF23-FA20F09C63A1 |
treatment provided by |
Plazi |
scientific name |
Lamprophaea aurita ( Hessle, 1925 ) |
status |
comb. nov. |
Lamprophaea aurita ( Hessle, 1925) , n. comb., reinst.
Fig. 13 View FIGURE 13
Leocrates auritus Hessle, 1925: 18–20 View in CoL , Fig. 5 View FIGURE 5 a–c.
Type material. Western Pacific. Japan. Holotype of Leocrates auritus Hessle, 1925 ( UUZM 626 View Materials ), Ogasawara, Chichi-jima (27°04’00” N, 142°12’30” E), coral, 25 Jul. 1914, S. Bock, coll. GoogleMaps
Description. Holotype (UUZM 626) complete, slightly dehydrated along middle region, slightly bent ventrally. Body pale ( Fig. 13A View FIGURE 13 ), obconic, slightly wider medially, blunt anteriorly, tapered posteriorly, 39 mm long, 4.5 mm wide (without parapodia), 16 chaetigers; right parapodium of chaetiger 9 previously removed, left parapodium of chaetiger 8 dissected (kept in container). Most tentacular, dorsal and ventral cirri intact. Body pale, eyes dark brown.
Prostomium as long as wide, slightly wider anteriorly. Lateral antennae with ceratophores well-defined, antennae about twice longer than prostomium, slightly longer than palps ( Fig. 13B View FIGURE 13 ). Palpophores 3–4 times longer than palpostyles. Median antenna long, surpassing anterior prostomial margin, inserted centrally on prostomium, between eyes.
Eyes dark brown, anterior eyes about twice larger than posterior ones, slightly emarginate, more distant to each other than posterior round eyes ( Fig. 13B View FIGURE 13 ).
Nuchal organs whitish, L-shaped, lateral lobes extended beyond lateral prostomial margins, lobes medially wider, not parallel-sided; lateral ciliated bands wide, clearly visible dorsally. Tentacular cirri mostly without tips, longer ones reach chaetiger 8. Lateral cushions low, entire, longitudinal striae visible.
Pharynx fully exposed, wider distally, without lateral vesicles. Anterior margin smooth, with irregular constrictions, better defined laterally ( Fig. 13C View FIGURE 13 ). Dorsal jaw brownish, exposed, inserted below pharynx margin; ventral jaw smaller, exposed.
Dorsal cirri longer than body width, including parapodia ( Fig. 13D View FIGURE 13 ), complete ones in middle segments half as long as body length. Chaetigers 1–3 without notochaetae; notochaetae present along chaetigers 4–16, about 60 per bundle, delicate, arranged in a transverse fan, notochaetae subdistally denticulate, denticles coarse ( Fig. 13E View FIGURE 13 ). Notacicular lobes short, blunt, round ( Fig 13D View FIGURE 13 , inset); neuracicular lobes blunt, projected, tips round, slightly longer than wide; aciculae black, tapered; ventral cirri surpass neurochaetal lobes. Neurochaetae about 30 per bundle, many blades missing, blades decreasing in size ventrally, bidentate, 6–9 times longer than wide, guards approaching subdistal tooth ( Fig. 13F View FIGURE 13 ).
Posterior region tapered, with several dorsal and anal cirri on site. Pre-anal segment with dorsal cirri twice thicker than ventral one. Pygidium with anus terminal; anal cirri reach chaetiger 12–13.
Oocytes not seen.
Remarks. Hessle (1925:18) described Leocrates auritus . His description is complete and the illustrations are very good. However, the type of nuchal organs together with the presence of single fang-shaped, upper and lower jaws of the pharynx indicate it belongs to Lamprophaea and hence the new combination. Pettibone (1970: 213, 219), regarded L. aurita as a junior synonym of Leocrates giardi Gravier, 1900 , described from the Red Sea, but this nomenclatural act did not involve the study of types. Further, because the nuchal organs lobes in these two species are so different, they are herein regarded as different species, and belonging to different genera. Consequently, the synonymy must be rejected, and the species name is reinstated.
As indicated in the key above, L. aurita resembles L. ockeri n. sp. from the Hawaiian Archipelago because they have notochaetae from chaetiger 4, and anterior eyes round or slightly emarginate. They differ in the shape of prostomial and nuchal organs lobes. In L. aurita the posterior prostomial margins are straight, leaving some space from the posterior eyes, and lateral nuchal organs lobes are medially and distally swollen, whereas in L. ockeri the posterior prostomial margins are curved, leaving almost no space between its margins and posterior eyes, and the lateral nuchal organ branches have parallel sides.
Distribution. Only known from the Bonin Islands, Japan, in shallow-water, coralline substrates.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Hesioninae |
Genus |
Lamprophaea aurita ( Hessle, 1925 )
Salazar-Vallejo, Sergio I. 2020 |
Leocrates auritus
Hessle, C. 1925: 20 |