Rhopalione sinensis Markham, 1990
publication ID |
https://doi.org/ 10.5252/zoosystema2024v46a7 |
publication LSID |
lsid:zoobank.org:pub:A7CA7D85-2633-4930-BA12-ACFCB3D0DE21 |
DOI |
https://doi.org/10.5281/zenodo.10881721 |
persistent identifier |
https://treatment.plazi.org/id/03B0992A-FFA8-AB4C-FEFB-FAFBE755F8DE |
treatment provided by |
Plazi |
scientific name |
Rhopalione sinensis Markham, 1990 |
status |
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Rhopalione sinensis Markham, 1990 View in CoL
( Fig. 7 View FIG )
Rhopalione uromyzon View in CoL – Nierstrasz & Brender à Brandis 1931: 175- 176 [host unknown, Zamboanga, Philippines; specimen examined herein] (not Rhopalione uromyzon Pérez, 1920 View in CoL ).
Rhopalione sinensis Markham, 1990: 555 View in CoL , 560-562, fig. 3 (ex Pinnotheres sinensis atrinae Sakai, 1939 View in CoL (now Arcotheres atrinae (Sakai, 1939)) View in CoL , Hong Kong); 1992: 299, table 1 [list]. — Huang 1994: 530 [list]; 2001: 327 [list]. — Li 2003: 140, 153, 158, table 1 [list]. — Morton 2003: 43, table 4 [list]. — An et al. 2009: 351 [list]; 2014: 1-2, fig. 1 (ex Arcotheres sinensis (Shen, 1932) View in CoL , Fujian Province, China), 4 [key to species]. — McDermott 2009: 790, 792, table 2 [list]. — Kuo et al. 2018: 1434-1448, fig. 1 (ex A. sinensis View in CoL , Taiwan). — Ahyong & Boyko 2019: 286 View Cited Treatment [comparison with R. kali View in CoL ], 287 [key to species]. — Williams et al. 2023: 533 [list], 539 [mention].
TYPE MATERIAL EXAMINED. — China • non-ovigerous holotype ♀ (3.9 mm TL), ex ♀ Pinnotheres sinensis atrinae Sakai, 1939 (now Arcotheres atrinae (Sakai, 1939) (6.5 mm CW); Hong Kong, Deep Bay , 16.IV.1954; B. Morton leg.; USNM 233554 About USNM .
OTHER MATERIAL EXAMINED. — Philippines • 1 non-ovigerous ♀ (7.13 mm TL), ex unknown host (pinnotherid); Zamboanga, St. Cruz Island ; 24.II.1914; Dr Th. Mortensen’s Pacific Expedition 1914-16, leg.; NHMD-1184775 .
DESCRIPTION (modified from Markham 1990; An et al.
2014)
Female
Body nearly straight, ovate in outline, longer than wide; all segments distinct. Head ovate, separated from pereon, wider than long, anterior and posterior margins convex, lateral margins rounded; thin frontal lamina. Eyes absent. Antennules of three articles each, antennae of five articles each, both setose, neither visible dorsally. Maxilliped longer than wide; broad non-articulated palp, apex rounded; plectron short, slender, straight. Barbula with one or two pairs of smooth, slender falcate projections laterally, weakly concave medially. Pereon nearly straight. Pereomeres dorsally distinct, produced laterally into tapered, rounded lobes; widest at pereomere 4; margins straight or weakly curved, mid-dorsal bosses and projections absent; irregularly-shaped dorsolateral bosses and rounded coxal plates on all seven pereomeres. Oostegites completely enclosing brood pouch, strongly vaulted ventrally, protruding beyond anterior margins of body, visible dorsally. Oostegite 1 longer than wide; anterior lobe rounded, larger than distal lobe; internal ridge digitate; posterior lobe with acute, nearly straight distal projection on margin. Oostegite 5 posterior margin fringed with setae. Pereopods isomorphic, subchelate. Pleon short, five pleomeres, all dorsally distinct, each with lateral plates produced into slender, distally rounded lobes, similar in size and shape to corresponding five pairs of biramous pleopods. Uniramous uropods similar in size and shape to pleopods and adjacent lateral plates of pleomere 5.
Male
Body elongate, fusiform, straight, length 3.0 × width; all segments distinct. Head transversely ovate in dorsal view, longer than pereomere 1; anterior margin broadly curved, medially concave; posterior margin broadly curved; eyes present. Antennules of three articles each, antennae of six articles each, both with terminal setae. Pereomeres 1-7 subequal in length, lateral margins rounded, pereomere 1 with posterior margin concave; all pereomeres subequal in width; midventral projections absent. Pereopods isomorphic in size and shape, subchelate. Pleon with tapered outline; pleomeres distinct, distal margins rounded, posteriorly recurved, apices blunt; pleopods 1-5 bulbous, uniramous. Pleotelson indented posteriorly.
REMARKS
Markham (1990) described R. sinensis based on the holotype female from Hong Kong. He noted that it closely resembled the female of R. uromyzon , but that R. sinensis had a head broader than long, well separated coxal plates, and indistinct dorsal separation of pleomeres whereas R. uromyzon had a nearly oval head, “somewhat separated coxal plates”, and distinct dorsal separation of all pleomeres. The holotype of R. sinensis was examined and found to agree with the description of Markham (1990) in all features except that the five projections on the inner ridge of the oostegite 1 are more clearly demarcated and spaced than indicated by Markham (1990: fig. 3I) and more like those seen in specimens of R. uromyzon from the Persian Gulf, and that the inner projection of the barbula is present, but only about half the length of the outer projection. Additionally, examination of the maxilliped and oostegite 1 of R. uromyzon shows them to be indistinguishable from those of R. sinensis . Based on female morphology, it is very difficult to distinguish R. sinensis from R. uromyzon except for the shape of the pleopods, which are much slenderer and more elongate in R. sinensis ; however, the males do show differences in that those of R. sinensis have the pleopods displaced laterally while those of R. uromyzon have the pleopods located closer to the pleon median.
The single female specimen ( Fig. 7 View FIG ) from the Philippines cited by Nierstrasz & Brender à Brandis (1931) was examined and is identifiable as R. sinensis rather than R. uromyzon ; it matches in body form ( Fig. 7A, B View FIG ), maxilliped ( Fig. 7D View FIG ), and oostegite 1 ( Fig. 7E View FIG ) morphology. The host for this specimen was given by Nierstrasz & Brender à Brandis (1931) as a Pinna bivalve but, as pointed out by Page (1985), the host must have been a Pinna -infesting pinnotherid.
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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SubFamily |
Keponinae |
Genus |
Rhopalione sinensis Markham, 1990
Boyko, Christopher B. & Williams, Jason D. 2024 |
R. kali
WILLIAMS J. D. & BOYKO C. B. & TRI N. V. 2023: 533 |
AHYONG S. T. & BOYKO C. B. 2019: 286 |
A. sinensis
KUO A. - L. & LIN F. - J. & HSU J. - T. & CHAN Y. - S. & UENG T. - T. 2018: 1434 |
Rhopalione sinensis
MARKHAM J. C. 1990: 555 |
Rhopalione uromyzon
NIERSTRASZ H. F. & BRENDER A BRANDIS G. A. 1931: 175 |