Trichopeltarion paradextrum, Tavares & Cleva & Contents, 2010

Tavares, Marcos & Cleva, Régis, 2010, Trichopeltariidae (Crustacea, Decapoda, Brachyura), A New Family And Superfamily Of Eubrachyuran Crabs With Description Of One New Genus And Five New Species, Papéis Avulsos de Zoologia (São Paulo) 50 (9), pp. 97-157 : 137-140

Trichopeltarion paradextrum sp. nov.

( Figures 24 A-B; 25)

Material examined:. Philippines,. Bohol,. Panglao,. Balicasag . Island,. in. tangle. nets. of. local. fishermen,. 200-300 m,. holotype. ♂. 29.2 x 25.0 mm. ( ZRC. 2002-0635);. same. data,. 50-500 m,. 1 ♂. paratype. 22.0 x 18.8 mm.( ZRC.2001-0501) .

Comparative material: Trichopeltarion balssi . (Rathbun,. 1932):. Japan,. stn 11,. 34°33’N- 129°04.5’E,. 125 m,.coarse.sand,.Tsushima.Exp.,. 26 Jul 1967,. 1 ♀. 24.5 x 23.0 mm. ( ZRC. 1999-0042);.Central. Japan,. Chiba,. off. Choshi ,. 200-300 m,. sand-mud. bottom,. 1990,. 2 ♂♂.23.3 x 20.6.and.20.3 x 17.5 mm.( CB- MZC.2886) .

Type locality:. Philippines,. Visayas,. Bohol,. Panglao ,. Balicasag.Island,.between.200.and.300.meters.depth .

Description of the holotype:. Small. Trichopeltarion . . Carapace.elongate.oval,.distinctly.longer.than.wide,. moderately. arched. transversally. and. longitudinally,. entirely. and. densely. covered. with. strong,. acute,. well. individualized. tubercles. and. short. tomentum.. Front. cut. into. three. prominent,. forward. directed,. acute.teeth,.bordered.with.setae.and.few.barbs;.central.tooth.slightly.longer.than.laterals..Orbits.large,. directed. laterally;. ocular. peduncles. slender,. freely. movable,. fully. retractable. into. orbital. cavity;. cornea.small,.scantily.pigmented..Orbital.teeth.strong,. armed. with. acute. barbs.. Innerorbital. tooth. swollen,. separated. from. lateral. rostral. tooth. by. deep,. U-shaped.gap;.innerorbital.and.second.supraorbital. teeth.separated. from.each.other.by.V-shaped,. deep. gap,.distinctly.narrower.than.preceding.one,.second. supraorbital.tooth.distinctly.shorter.and.thinner.than. innerorbital. tooth;. exorbital. tooth. slightly. shorter. than.second.supraorbital.one,.acute,.slightly.direct- ed.outward..Hepatic,.first,.and.second.epibranchial. teeth. discrete. but. well. recognizable,. progressively. decreasing.in.size.from.front.to.back..Hepatic.tooth. slightly. smaller. than. exorbital. tooth,. acute,. armed. with.barbs;.first.epibranchial.tooth.raising.from.discrete. swollen. base,. little. longer. than. neighboring. tubercles,. armed. with. barbs;. second. epibranchial. tooth. shortest,. raising. from. discrete. swollen. base,. similar.to.neighboring.tubercles,.armed.with.barbs.. Posterolateral.margin.extending.gently.rounded.into. posterior.margin,.ornamented.with.acute.tubercles.. Posterior.margin.almost.straight,.only.slightly.concave.axially,.bordered.with.row.of.rounded.granules,. all. about. same. size;. minute. acute. granules. below. posterior. border.. Carapace. grooves. well. distinct,. wide,. smooth. inside;. branchiocardiac. groove. deepest,. sinuous.. Gastric,. mesogastric,. and. protogastric. regions. gently. swollen,. crested. with.individualized,. strong,.acute.tubercles.

Thoracic . sternum. smooth,.densely. pilose.. Pair. of.tubercles.of.abdominal.locking.system.placed.near. sternal.suture.5/6.

Right. cheliped. extremely. developed,. massive.. Dactylus.crested.with.patches.of.small,.acute.tubercles. proximally;.minute,.rounded,.granules.along.its.entire. superior.border,.decreasing.in.size.towards.distal.end;. otherwise.smooth..Dactylus.noticeably.curved.downward.terminally,.little.longer.than.fixed.finger;.cutting. edge.with.very.low,.polished,.molariform.teeth..Fixed.

finger.with.minute,.rounded,.granules.along.its.entire. inferior.border,.otherwise.smooth;.cutting.edge.teeth. very.low,. polished,. molariform.. Propodus.extremely. massive,. its. dorsal.face. densely. covered. with. strong,. acute.tubercles;.its.upper.lateral.and.mesial.sides.with. sparse,.smaller.tubercles.and.granules;.propodus.otherwise.smooth..Upper.and.lateral.faces.of.carpus.with. spiny.tubercles.of.different.sizes.and.granules;.mesial. face. smooth;. inner. anterolateral. angle. with. strong. tooth,.covered.with.acute.tubercles..Merus.dorsal.face. with.patches.of.strong,.acute.tubercles;.upper.parts.of. lateral. and. mesial. sides. of. merus.with.sparse,. small,. acute.tubercles.and.granules,.lower.parts.smooth.with. a. tendency. toward. smooth;. merus. ventral. with. few. acute.tubercles..Small.cheliped.densely.setose;.dactylus. delicate,. regularly. and. gently. curved. downward;. densely.setose.and.sparsely.tuberculated.dorsally;.sulcated.along.lateral.and.mesial.sides,.sulci.densely.setose;.cutting.edge.with.low.teeth..Fixed.finger.almost. straight,.curved. upwards.distally;.sulcated.along. lateral.and.mesial.sides,.sulci.densely.setose..Carpus.dorsal.surface.with.sparse,.strong,.acute.tubercles..P2-5. densely.setose;.dactili.markedly.longer.than.propodi;. P5.merus-carp.articulation.far.from.reaching.second. epibranchial.tooth. Male. abdomen. of. six. free. segments. and. telson;. telson.and.segments.densely. covered. with. fine,. long,.setae;.segments.1-2. with. few,.sparse.tubercles,. remaining. segments. smooth.. Male. abdominal. segment.6.longer.than.preceding.ones,.nearly.squarish,. its.anterolateral.angles.only.distinctly.protruded.and. swollen;. complementary.parts. of. abdominal.locking. system. present. and. functional.. G2. styliform,. only. little.longer.than.G1,.crossing.near.tip.

Etymology:.The.specific.name.is.derived.from.a.combination.of.the.Latin. words. para.close.to,.near,.and. dexter,.right.(as.opposed.to.left),.in.allusion.to.the.resemblance.with. Trichopeltarion dextrum .

Remarks: Trichopeltarion paradextrum .sp. nov..resembles. T. balssi . (figure. 26A-D).and. T. dextrum . (figure. 18A-D). in. having. the. carapace. elongate. oval,. distinctly. longer. than. wide;. discrete. hepatic,. first. and. second. epibranchial. teeth;. and. central. rostral. tooth. longer. than. lateral. ones.. Trichopeltarion paradextrum .sp. nov..can.be.readily.distinguished.from.both. T. balssi .and. T. dextrum .by.its.strong.orbital.teeth.(orbital.teeth.lobe-like.in. T. balssi . and. T. dextrum );. innerorbital. tooth. separated. from. lateral. rostral. tooth. front. by. deep,. U-shaped. gap. (separated. by. a. shallow. gap. in. T. balssi . and. T. dextrum );. innerorbital. and. second. supraorbital. teeth. separated. from. each. other.by.a.narrow,.V-shaped,.deep.gap.(separated.by. a.shallow.and.wide.gap.in. T. balssi .and. T. dextrum ).. Trichopeltarion paradextrum .sp. nov..additionally.differs.from. T. balssi . on. the. basis.of. the. dorsal. surface. of. the. carapace. entirely. covered. with. strong,. acute,. well.individualized.tubercles.(metagastric,.mesobranchial,. cardiac,. and. intestinal. regions. of. the.carapace. with.clusters.of.coalescent,.large,.rounded,.sometimes. blunt.tubercles.in. T. balssi );.G2.tip.far.from.reaching. to.the.thoracic.sternal.suture.4/5.(G2.tip.reaching.to. the.sternal.suture.4/5.in. T. balssi )..The.central.rostral. tooth.slightly.longer.than.the.lateral.ones.further.differentiates. Trichopeltarion paradextrum .sp. nov.. from. Trichopeltarion dextrum ,.whose.central.rostral.tooth.is. much.longer.than.the.lateral.rostral.teeth.

Distribution:. Known. only. from. the. type. locality. so. far.

Figures

FIGURE 24:. Trichopeltarion paradextrum. sp. nov.. A-B, Holotype. male. 29.2 x 25.0 mm. (ZRC.2002-0635).. A, General. dorsal. view.. B, Anterior.region.of.carapace.in.dorsal.view.