Sphenomeridinae Števčić, 2005,
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publication ID |
https://doi.org/ 10.26107/RBZ-2023-0047 |
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publication LSID |
lsid:zoobank.org:pub:821BC4EC-5AF9-4727-84A3-C44839DFBE28 |
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persistent identifier |
https://treatment.plazi.org/id/038EC92D-797D-7E4E-FCF7-68942710FAD2 |
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treatment provided by |
Felipe |
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scientific name |
Sphenomeridinae Števčić, 2005 |
| status |
new status |
Subfamily Sphenomeridinae Števčić, 2005 , new status
Sphaenomeridini Števčić, 2005: 40 [sic].
Type genus. Sphenomerides Rathbun, 1897 View in CoL .
Diagnosis. Carapace transversely ovate ( Fig. 12A, C View Fig ); antero- and posterolateral margins clearly demarcated, anterolateral margin with 2 sharp teeth (excluding sharp external orbital spine); front denticulate, confluent with prominently posteriorly sloping, entire supraorbital margin; posterolateral margin distinctly convex ( Fig. 12A, C View Fig ); carapace high, dorsal surface prominently convex in frontal view ( Fig. 12B View Fig ); posterior margin of epistome with small median lobe, lateral margin relatively short, with 2 triangular lobes, separated by prominent concavity from pterygostomial lobe ( Figs. 5C View Fig , 12B View Fig ). Basal antennal article quadrate, mobile, peduncle entering hiatus of orbit. Maxilliped 3 merus quadrate, slightly longer than wide, narrower than trapezoidal ischium at midlength ( Fig. 6D View Fig ). Chelipeds long, heterochelous, major cheliped longer than twice carapace width; merus quadrate in dorsal view, short, with sharp spines on flexor margin; carpus inner angle with short spine ( Fig. 12A View Fig ). P2–5 long, longest pereopod about 1.5 times carapace width; merus slender, elongated; dactylus with 3–5 transverse comb-like rows of narrow, soft, feeding setae on flexor margin only, absent from facial surface ( Fig. 12A, E, F View Fig ). Male thoracic sternum elongated, with sternopleonal cavity reaching anteriorly to level of anterior margin of P2 coxae ( Fig. 7E View Fig ); demarcation between male thoracic sternites 2, 3 indicated by change in contour but no suture visible ( Fig. 7E View Fig ); tubercle of male pleonal-locking mechanism small, on anterior one-third of thoracic sternite 5 ( Fig. 8J View Fig ). Male pleon relatively narrow transversely; lateral margins of somites 3–6 converging; somites 3–5 fused with sutures shallow to undiscernible medially, distinct laterally ( Figs. 7E View Fig , 8D View Fig , 12D View Fig ). G1 slender sinuous; distal portion with tapering to rounded tip, margins without long or stout spinules ( Fig. 9I View Fig ). G2 about one-quarter length of G1 ( Fig. 9J View Fig ). Vulva ovate, opening directed inwards, with hard lateral sternal cover that arches over narrow membrane-covered opening; vulvae positioned closer to median line of sternum ( Fig. 10E View Fig ).
Genus included. Sphenomerides Rathbun, 1897 .
Remarks. The only known species in the genus, Sphenomerides trapezioides , has been reported living in hard siliceous sponges from 136–528 m depth off Madagascar ( Castro, 2013) and antipatharian corals in the Bay of Bengal at 48–49 m ( Silambarasan et al., 2023).
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.