Trichopeltarion parvum, 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 : 140-142

Trichopeltarion parvum sp. nov.

( Figures 27 A-F; 28A-B)

Material examined:. Solomon. Islands ,. SALOMON. 2,. Alis,. stn CP 2228,. 06°34.7’S- 156°10.5’E,. 609-625 m,. Bouchet. et al. . coll.. Nov 2004:. holotype. ♀. 11.5 x 10.5 mm. ( MNHN-B31972 );. Solomon. Islands,. SALOMONBOA. 3,. stn CP 2825,. 10°25’S- 162°02’E,. 532-883 m,. Richer. de. Forges. &. Boisselier. coll.,. 20 Sep 2007,. 1 ♀. 21.5 x 19.9 mm. ( MNHN-B32398 ) .

Type locality:. Solomon.Islands ,. 06°34.7’S- 156°10.5’E,. 609-625 m.

Description of the holotype:.Small. Trichopeltarion . .Carapace.pentagonal,.distinctly.longer.than.wide,.slightly. arched.transversally,.moderately.arched.longitudinally,.entirely.covered.with.serrate.setae..Front.cut.into. three. prominent,. forward. directed,. slightly. curved. downward. teeth.. Frontal. teeth. bordered. with. setae,. devoid. of. barbs;. central. tooth. spatuliform. in. dorsal. view,.tip.rounded,.longer.than.laterals;.lateral.rostral. teeth. acute,. reaching. to. little. more. than. two-thirds. of. central. tooth.length..Orbits. small,. directed. laterally;.ocular.peduncles.short,.freely.movable,.not.fully. retractable.into.orbital.cavity;.cornea.small,.nearly.unpigmented..Orbital.teeth.weak,.lobe-like,.barbs.lacking..Innerorbital.low,.triangular.in.dorsal.view,.separated.from.lateral.rostral.tooth.by.shallow,.U-shaped. gap;.innerorbital.and.second.supraorbital.teeth.separated.from.each.other.by.V-shaped,.shallow.gap;.second.supraorbital.shortest,.showing.as.a.boss.dorsally,. almost.entirely.fused.to.the.exorbital.tooth;.exorbital. tooth.wide.triangular.in.dorsal.view,.ending.in.small. acute. tubercle,. with. distinct. dorsal. bump.. Hepatic,. first,.and.second.epibranchial,.and.first.metabranchial. teeth. distinct,. progressively. decreasing. in. size. from. front.to.back,.barbs.lacking..Hepatic.tooth.strongest,. curved. forward,. ending. in. small,. rounded. tubercle;. first.epibranchial.tooth.directed.outwards,.ending.in. two,. small,. rounded. tubercles;. second. epibranchial. tooth. showing. as. large. boss. crested. with. one. small,. rounded. tubercle;. first. metabranchial. showing. as. smooth,. small. boss.. Posterior. margin. only. slightly. concave. axially,. smooth. except. for. row. of. minute. granules,.more.developed.laterally..Carapace.grooves. shallow,.little.distinct..Hepatic,.gastric,.and.epibranchial.regions.swollen,.smooth.

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

Chelipeds. equal. in. size. and. shape,. densely. pilose.. Dactylus. delicate,. regularly. and. gently. curved. downward;.densely.setose.dorsally,.smooth,.except.for. few,.sparse.tubercles;.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. smooth. dorsally,. lateral. surface. with. sparse.tubercles;.inner.anterolateral.angle.with.acute. tooth.. P2-5. densely. setose;. dactili. markedly. longer. than.propodi;.P5.merus-carp.articulation.reaching.to. second.epibranchial.tooth.

Female. abdomen. of. six. free. segments. and. telson;. telson. and. segments. sparsely. setose,. smooth.. Complementary. parts. of. abdominal. locking. system. present,.functional.

Etymology:.The.specific.name.comes.from.the.Latin,. neuteur.adjective. parvum ,.meaning.small.

Remarks: Trichopeltarion parvum .sp. nov.. is.most.different. from.the. remaining. species. in. the. genus.. It. is. distinguished.from.its.congeners.by.a.unique.suite.of. characters.which.include.carapace.pentagonal,.almost. completely.smooth;.carapace.grooves.shallow,.little.distinct;.hepatic,.gastric,. and.epibranchial. regions.swollen;.orbital.teeth.weak,.lobe-like;.innerorbital.low,.separated.from.lateral.rostral.tooth.by.shallow,.U-shaped. gap;.innerorbital.and. second.supraorbital. teeth.separated.from.each.other.by.V-shaped,.shallow.gap;.second.supraorbital.shortest,.almost.entirely.fused.to.the. exorbital.tooth;.hepatic,.first,.and.second.epibranchial,. and.first.metabranchial.teeth.distinct,.progressively.decreasing.in.size.from.front.to.back,.barbs.lacking.

Distribution:.Known.only.from.the.Solomon.Islands,. between.532.and.883.meters.depth.

Figures

FIGURE 27:. Trichopeltarion parvum. sp. nov.. A-C, Paratype. female. 11.5 x 10.5 mm. (MNHN-B31972).. D-F, Holotype. female. 21.5 x 19.9 mm.(MNHN-B32398)..A, General.dorsal.view..B, D, Carapace.in.dorsal.view..Note.tomentum..C, Cephalothorax.in.ventral. view..E-F, Anterior.region.of.carapace.in.dorsal.view.(tomentum.of.right.half.removed.in.F).