Pontonides sibogae Bruce, 2005

Park, Jin-Ho, De Grave, Sammy & Park, Taeseo, 2022, First record of the symbiotic palaemonid shrimp Pontonides sibogae Bruce, 2005 (Crustacea, Decapoda, Palaemonidae) from Korea, Biodiversity Data Journal 10, pp. 85913-85913 : 85913

publication ID	https://dx.doi.org/10.3897/BDJ.10.e85913
persistent identifier	https://treatment.plazi.org/id/B2660DC5-4BFD-58A7-87AA-1BADFC75BC9A
treatment provided by	Biodiversity Data Journal by Pensoft
scientific name	Pontonides sibogae Bruce, 2005
status

Treatment

Pontonides sibogae Bruce, 2005 - Bruce 2005 [377, type locality: Sape Strait, Indonesia, 8°23.5' S 119°4.6' E]; De Grave and Fransen 2011 [370].

Pontonides unciger - Holthuis 1952 [249, figs. 108-112]; Fujino and Miyake 1969 [87, fig. 1]; Heard 1986 [480, Table 1]. (not Calman 1939)

Pontonides cf. sibogae - Marin 2007 [fig. 11C-E].

Materials

Type status: Other material. Occurrence: recordNumber: JH1109; recordedBy: Jin-Ho Park; Damin Lee ; Sang-Hui Lee ; individualCount: 1; sex: female; lifeStage: adult (pocl 2.4 mm); reproductiveCondition: ovigerous; preparations: whole animal; dissected (mouthparts, pereiopods) (ETOH); Taxon : scientificNameID: urn:lsid:marinespecies.org:taxname:389607; scientificName: Pontonides sibogae Bruce , 2005; kingdom: Animalia ; phylum: Arthropoda ; class: Malacostraca ; order: Decapoda ; family: Palaemonidae ; genus: Pontonides ; specificEpithet: sibogae; taxonRank: species; nomenclaturalCode: ICZN; Location : higherGeography: East Asia; Korea; Jejudo Island ; Munseom Islet ; waterBody: West Pacific Ocean ; island: Jejudo Island ; country: Korea; countryCode: Korea /KR; locality: SW Munseom Islet, 33.225092° 126.563375°, 75 m in depth (fcn JH1109) ; verbatimDepth: 75 m; decimalLatitude: 33.225092; decimalLongitude: 126.563375; Identification: identifiedBy: Jin-Ho Park; Event: samplingProtocol: Trimix SCUBA diving; eventDate: 2020-01-15; fieldNotes: from a colonial dendrophylliid coral Dendrophyllia sp. (leg. DM Lee); Record Level: language: kr & en; institutionID: NIBRIV0000896187; collectionID: fcn JH1109; institutionCode: National Institute of Biological Resources (NIBR) GoogleMaps GoogleMaps

Description

Small-sized palaemonid shrimp, body flattened dorsoventrally.

Carapace (Fig. 1 View Figure 1 A and B) smooth, with two low dorsal tubercles on sides of mid-line, without hepatic tooth. Rostrum short, extending to about 0.8 of first segment of antennular peduncle, toothless, elevated basal crest; lateral carina developed, connecting with supraorbital carina medially. Supraorbital carina well developed, with distinct tooth, expanding to proximal peduncle of eye, forming supraocular eave. Ocular orbit well developed, concave. Inferior orbital angle well-developed, extending ventrad below antennal tooth, roundly produced in lateral view, slightly embracing antennal basicerite. Antennal tooth small and slender, situated along upper margin of inferior orbital angle. Pterygostomial angle roundly produced, non-dentate.

Abdominal pleura of first to fifth somite rounded (Fig. 1 View Figure 1 C). Sixth abdominal somite about 1.5 times as long as dorsal length of fifth somite. Posterolateral angle broadly subtriangular in shape, pointed, posteroventral angle acute.

Telson (Fig. 1 View Figure 1 D and E) about 0.6 of pocl, about 2 times longer than maximal width; dorsal surface with numerous fusiform setae longitudinally; two pairs of dorsal spiniform setae, subequal in size, at about 0.5 and 0.8 of telson length, respectively, posterior margin with three sets of spiniform setae, lateral posterior spiniform setae short, about 0.45 of length of intermediate pair, intermediate pair long and stout, smedian pair with three spiniform setae, about 0.6 of intermediate pair length, distally setulose.

Eye (Fig. 1 View Figure 1 A and B) with ellipsoid cornea, obliquely set on eyestalk, without nebenauge; eyestalk with distinct tubercle anteriorly.

Antennule (Fig. 1 View Figure 1 A and B) with proximal article of peduncle with convex anterior margin, acute distolateral tooth overreaching intermediate segment, without ventromesial tooth; stylocerite short, sharply pointed, reaching to about 0.4 of proximal article. Intermediate and distal segment short, together equalling about 0.5 of proximal segment length. Upper flagellum biramous, with proximal four segments fused on right side (three on left side), fused part and short ramus with aesthetascs, longer free ramus filiform. Lower flagellum slender, filiform.

Antenna (Fig. 1 View Figure 1 A and B) with stout unarmed basicerite; carpocerite reaching about 0.7 of scaphocerite; scaphocerite ovoid, about 1.7 times longer than maximal width, acute distolateral tooth situated at about 0.8 of scaphocerite length, exceeded by distal lamella.

Mandible (Fig. 2 View Figure 2 A) without palp. Molar process robust, with six blunt teeth, without setae. Incisor process with four distal teeth, central pair smaller than outer pair.

Maxillula (Fig. 2 View Figure 2 B) with bilobed palp. Upper lacinia stout, with six robust spines and several setae distally. Lower lacinia with several setae distally.

Maxilla (Fig. 2 View Figure 2 C) with tapering non-setose palp. Coxal endite obsolete, basal endite reduced to rounded lobe with mesial margin with long serrulose setae. Scaphognathite normal, about 2.4 times as long as broad, with marginal plumose setae.

First maxilliped (Fig. 2 View Figure 2 D) with distinct slender palp. Basal and coxal endites fused, with marginal serrulate setae. Exopod with large ovoid caridean lobe, far exceeding palp, with plumose marginal setae. Flagellum of exopod greatly reduced to small knob. Epipod large, widely triangular, bilobed.

Second maxilliped (Fig. 2 View Figure 2 E) with coxa unarmed, epipod lange, elongate, hooked. Basis without exopod. Propodal segment with simple spines. Dactyl dactylar segment well developed, deeply emarginate medially, with row of stout serrulate spines and simple setae.

Third maxilliped (Fig. 2 View Figure 2 F) with coxa with rounded lateral lobe, small, but distinct arthrobranch present. Basis completely fused with ischiomerus, about 4.3 times as long as maximal width, with long simple setae medially, exopod absent; lateral margin sparsely furnished with short simple setae. Penultimate segment about 0.24 length of antepenultimate segment, about 1.5 times longer than maximal width, with long and robust simple setae medially. Terminal segment as long as penultimate segment length, about 2 times longer than maximal width, with rows of serrulate and simple long setae medially.

First pereiopod (Fig. 3 View Figure 3 A) coxa and basis without special features. Ischium with simple setae. Merus about 0.95 of carpus length. Carpus about 1.45 times as long as chela, about 7 times as long as distal width, slightly tapering proximally. Carpo-propodal joint with medial cleaning brush. Chela about 4.2 times as long as maximal width, with subcylindrical palm; fingers (Fig. 3 View Figure 3 B) about 0.8 of palm length, with numerous terminal setae, cutting edges entire, situated mesially, tips hooked.

Second pereiopods similar in shape, unequal in size. Major second pereiopod (Fig. 3 View Figure 3 C) coxa and basis without special features. Ischium about 0.9 of merus length, with row of fusiform setae along dorsal margin, with simple setae along ventral margin. Merus about 0.6 of palm length, with short simple setae along ventral margin. Carpus about 0.3 of palm length, tapering proximally, unarmed. Chela (Fig. 3 View Figure 3 D) about 1.1 times as long as pocl, about 2.2 times as long as merus length, with numerous short simple setae along ventromedial margin. Palm cylindrical, smooth, non-tuberculate, about 3.4 times as long as dactylus, about 4.0 times as long as maximum width. Fingers (Fig. 3 View Figure 3 E) subequal in size, slightly curved mesially, with strong subacute demarcated tip, with simple setae; fixed finger with distinct tooth on cutting edge, large round tooth at about 0.8 of proximal cutting edge; dactylus slightly overreaching fixed finger, about 0.3 of palm length, with distinct tooth at about 0.7 of proximal cutting edge, proximal cutting edge entire.

Minor second pereiopod (Fig. 3 View Figure 3 F) coxa and basis without special features. Ischium about 0.95 of merus length, with row of fusiform setae along dorsal margin, with simple setae along ventral margin. Merus about 0.75 of palm length, with short simple setae along ventral margin. Carpus about 0.35 of palm length, tapering proximally, unarmed. Chela (Fig. 3 View Figure 3 G) about 0.65 of pocl, about 1.8 times as long as merus length, with numerous short simple setae along ventromedial margin. Palm cylindrical, smooth, non-tuberculate, about 2.8 times as long as dactylus, about 3.2 times as long as maximum width. Fingers with entire cutting edges, with subacute demarcated tip, with simple setae; dactylus slightly overreaching fixed finger, about 0.35 of palm length.

Ambulatory pereiopods subequal in shape; left fourth pereiopod slightly shorter and more slender than right third and fifth; right ambulatory pereiopods subequal in length. Third pereiopod (Fig. 4 View Figure 4 A) coxa and basis without special features. Ischium about 0.45 of merus length, unarmed. Merus about 3.1 times as long as carpus length, about 3.8 times as long as maximal depth, unarmed. Carpus about 0.3 of propodus length, about 1.8 times as long as maximal depth, slightly tapering proximally, unarmed. Propodus about 2.2 times as long as dactylus length, about 5.3 times as long as maximal depth, sparsely setose, unarmed. Dactylus (Fig. 4 View Figure 4 B) about 0.45 of propodus length, about 4.1 times as long as proximal width, uniformly tapering distally, unarmed, with long unguis.

Fourth pereiopod (Fig. 4 View Figure 4 C) coxa and basis without special features. Ischium, merus and carpus about 0.4, 0.95, 0.35 of propodus length, respectively, unarmed. Propodus about 5 times as long as distal width, about 2.2 times length of dactylus, sparsely setose, unarmed. Dactylus (Fig. 4 View Figure 4 D) about 3.7 times as long as proximal width, uniformly tapering distally, unarmed, with long unguis.

Fifth pereiopod (Fig. 4 View Figure 4 E) coxa and basis without special features. Ischium, merus and carpus about 0.35, 0.8, 0.33 of propodus length, respectively, unarmed. Propodus about 6 times as long as distal width, about 3.3 times length of dactylus, sparsely setose, unarmed. Dactylus (Fig. 4 View Figure 4 F) about 3.4 times as long as proximal width, uniformly tapering distally, unarmed, with long unguis.

Uropods (Fig. 1 View Figure 1 D) extending well beyond distal margin of telson. Protopodite unarmed laterally. Exopod subequal to exopod length, with lateral border almost straight, entire, terminating in a single mobile spiniform seta, without distolateral tooth (Fig. 1 View Figure 1 F).

Colour

The single collected specimen exhibits cryptic colouration in relation to the host species (Fig. 5 View Figure 5 ). Body and appendages generally covered with orange chromatophores, with faint creamy-orange transverse bands from anterior to proximal at regular intervals (Fig. 5 View Figure 5 A and B). Telson and uropods predominantly transparent with white and yellow chromatophores (Fig. 5 View Figure 5 B). Pereiopods predominantly creamy-orange colour with translucent bands at regular intervals.

Distribution

The species is currently reported in tropical to temperate waters in the West Pacific Ocean, as follows: Indonesia (type locality: Sape Strait, 8°23.5' S 119°4.6' E), Japan (Amakusa Island), and Korea (Jejudo Island) ( Holthuis 1952, Fujino and Miyake 1969, present study).

Ecology

The present specimen was found in association with a colonial dendrophylliid coral Dendrophyllia sp., with an orange coenosarc and orange-yellow tentacles ( Scleractinia, Dendrophylliidae ) (Fig. 5 View Figure 5 C). The host coral was only observed between 65 and 75 m depth.